* [PATCH v2 1/7] Basic kernel memory functionality for the Memory Controller
2011-09-15 1:46 [PATCH v2 0/7] per-cgroup tcp buffer pressure settings Glauber Costa
@ 2011-09-15 1:46 ` Glauber Costa
2011-09-17 17:45 ` Kirill A. Shutemov
2011-09-15 1:46 ` [PATCH v2 2/7] socket: initial cgroup code Glauber Costa
` (5 subsequent siblings)
6 siblings, 1 reply; 26+ messages in thread
From: Glauber Costa @ 2011-09-15 1:46 UTC (permalink / raw)
To: linux-kernel
Cc: paul, lizf, kamezawa.hiroyu, ebiederm, davem, gthelen, netdev,
linux-mm, Glauber Costa
This patch lays down the foundation for the kernel memory component
of the Memory Controller.
As of today, I am only laying down the following files:
* memory.independent_kmem_limit
* memory.kmem.limit_in_bytes (currently ignored)
* memory.kmem.usage_in_bytes (always zero)
Signed-off-by: Glauber Costa <glommer@parallels.com>
CC: Paul Menage <paul@paulmenage.org>
CC: Greg Thelen <gthelen@google.com>
---
Documentation/cgroups/memory.txt | 29 ++++++++++-
init/Kconfig | 11 ++++
mm/memcontrol.c | 105 ++++++++++++++++++++++++++++++++++++-
3 files changed, 140 insertions(+), 5 deletions(-)
diff --git a/Documentation/cgroups/memory.txt b/Documentation/cgroups/memory.txt
index 6f3c598..ca58eff 100644
--- a/Documentation/cgroups/memory.txt
+++ b/Documentation/cgroups/memory.txt
@@ -44,8 +44,9 @@ Features:
- oom-killer disable knob and oom-notifier
- Root cgroup has no limit controls.
- Kernel memory and Hugepages are not under control yet. We just manage
- pages on LRU. To add more controls, we have to take care of performance.
+ Hugepages is not under control yet. We just manage pages on LRU. To add more
+ controls, we have to take care of performance. Kernel memory support is work
+ in progress, and the current version provides basically functionality.
Brief summary of control files.
@@ -56,8 +57,11 @@ Brief summary of control files.
(See 5.5 for details)
memory.memsw.usage_in_bytes # show current res_counter usage for memory+Swap
(See 5.5 for details)
+ memory.kmem.usage_in_bytes # show current res_counter usage for kmem only.
+ (See 2.7 for details)
memory.limit_in_bytes # set/show limit of memory usage
memory.memsw.limit_in_bytes # set/show limit of memory+Swap usage
+ memory.kmem.limit_in_bytes # if allowed, set/show limit of kernel memory
memory.failcnt # show the number of memory usage hits limits
memory.memsw.failcnt # show the number of memory+Swap hits limits
memory.max_usage_in_bytes # show max memory usage recorded
@@ -72,6 +76,9 @@ Brief summary of control files.
memory.oom_control # set/show oom controls.
memory.numa_stat # show the number of memory usage per numa node
+ memory.independent_kmem_limit # select whether or not kernel memory limits are
+ independent of user limits
+
1. History
The memory controller has a long history. A request for comments for the memory
@@ -255,6 +262,24 @@ When oom event notifier is registered, event will be delivered.
per-zone-per-cgroup LRU (cgroup's private LRU) is just guarded by
zone->lru_lock, it has no lock of its own.
+2.7 Kernel Memory Extension (CONFIG_CGROUP_MEM_RES_CTLR_KMEM)
+
+ With the Kernel memory extension, the Memory Controller is able to limit
+the amount of kernel memory used by the system. Kernel memory is fundamentally
+different than user memory, since it can't be swapped out, which makes it
+possible to DoS the system by consuming too much of this precious resource.
+
+Memory limits as specified by the standard Memory Controller may or may not
+take kernel memory into consideration. This is achieved through the file
+memory.independent_kmem_limit. A Value different than 0 will allow for kernel
+memory to be controlled separately.
+
+When kernel memory limits are not independent, the limit values set in
+memory.kmem files are ignored.
+
+Currently no soft limit is implemented for kernel memory. It is future work
+to trigger slab reclaim when those limits are reached.
+
3. User Interface
0. Configuration
diff --git a/init/Kconfig b/init/Kconfig
index d627783..49e5839 100644
--- a/init/Kconfig
+++ b/init/Kconfig
@@ -689,6 +689,17 @@ config CGROUP_MEM_RES_CTLR_SWAP_ENABLED
For those who want to have the feature enabled by default should
select this option (if, for some reason, they need to disable it
then swapaccount=0 does the trick).
+config CGROUP_MEM_RES_CTLR_KMEM
+ bool "Memory Resource Controller Kernel Memory accounting"
+ depends on CGROUP_MEM_RES_CTLR
+ default y
+ help
+ The Kernel Memory extension for Memory Resource Controller can limit
+ the amount of memory used by kernel objects in the system. Those are
+ fundamentally different from the entities handled by the standard
+ Memory Controller, which are page-based, and can be swapped. Users of
+ the kmem extension can use it to guarantee that no group of processes
+ will ever exhaust kernel resources alone.
config CGROUP_PERF
bool "Enable perf_event per-cpu per-container group (cgroup) monitoring"
diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index ebd1e86..1c5d01a 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -73,7 +73,11 @@ static int really_do_swap_account __initdata = 0;
#define do_swap_account (0)
#endif
-
+#ifdef CONFIG_CGROUP_MEM_RES_CTLR_KMEM
+int do_kmem_account __read_mostly = 1;
+#else
+#define do_kmem_account (0)
+#endif
/*
* Statistics for memory cgroup.
*/
@@ -270,6 +274,10 @@ struct mem_cgroup {
*/
struct res_counter memsw;
/*
+ * the counter to account for kmem usage.
+ */
+ struct res_counter kmem;
+ /*
* Per cgroup active and inactive list, similar to the
* per zone LRU lists.
*/
@@ -321,6 +329,11 @@ struct mem_cgroup {
*/
unsigned long move_charge_at_immigrate;
/*
+ * Should kernel memory limits be stabilished independently
+ * from user memory ?
+ */
+ int kmem_independent;
+ /*
* percpu counter.
*/
struct mem_cgroup_stat_cpu *stat;
@@ -391,6 +404,7 @@ enum charge_type {
#define _MEM (0)
#define _MEMSWAP (1)
#define _OOM_TYPE (2)
+#define _KMEM (3)
#define MEMFILE_PRIVATE(x, val) (((x) << 16) | (val))
#define MEMFILE_TYPE(val) (((val) >> 16) & 0xffff)
#define MEMFILE_ATTR(val) ((val) & 0xffff)
@@ -3941,12 +3955,18 @@ static unsigned long mem_cgroup_recursive_stat(struct mem_cgroup *mem,
static inline u64 mem_cgroup_usage(struct mem_cgroup *mem, bool swap)
{
u64 val;
+ u64 kmem = 0;
+
+ if (!mem->kmem_independent)
+ kmem = res_counter_read_u64(&mem->kmem, RES_USAGE);
if (!mem_cgroup_is_root(mem)) {
if (!swap)
- return res_counter_read_u64(&mem->res, RES_USAGE);
+ kmem += res_counter_read_u64(&mem->res, RES_USAGE);
else
- return res_counter_read_u64(&mem->memsw, RES_USAGE);
+ kmem += res_counter_read_u64(&mem->memsw, RES_USAGE);
+
+ return kmem;
}
val = mem_cgroup_recursive_stat(mem, MEM_CGROUP_STAT_CACHE);
@@ -3979,6 +3999,10 @@ static u64 mem_cgroup_read(struct cgroup *cont, struct cftype *cft)
else
val = res_counter_read_u64(&mem->memsw, name);
break;
+ case _KMEM:
+ val = res_counter_read_u64(&mem->kmem, name);
+ break;
+
default:
BUG();
break;
@@ -4756,6 +4780,21 @@ static int mem_cgroup_reset_vmscan_stat(struct cgroup *cgrp,
return 0;
}
+#ifdef CONFIG_CGROUP_MEM_RES_CTLR_KMEM
+static u64 kmem_limit_independent_read(struct cgroup *cont, struct cftype *cft)
+{
+ return mem_cgroup_from_cont(cont)->kmem_independent;
+}
+
+static int kmem_limit_independent_write(struct cgroup *cont, struct cftype *cft,
+ u64 val)
+{
+ cgroup_lock();
+ mem_cgroup_from_cont(cont)->kmem_independent = !!val;
+ cgroup_unlock();
+ return 0;
+}
+#endif
static struct cftype mem_cgroup_files[] = {
{
@@ -4877,6 +4916,46 @@ static int register_memsw_files(struct cgroup *cont, struct cgroup_subsys *ss)
}
#endif
+
+#ifdef CONFIG_CGROUP_MEM_RES_CTLR_KMEM
+static struct cftype kmem_cgroup_files[] = {
+ {
+ .name = "independent_kmem_limit",
+ .read_u64 = kmem_limit_independent_read,
+ .write_u64 = kmem_limit_independent_write,
+ },
+ {
+ .name = "kmem.usage_in_bytes",
+ .private = MEMFILE_PRIVATE(_KMEM, RES_USAGE),
+ .read_u64 = mem_cgroup_read,
+ .register_event = mem_cgroup_usage_register_event,
+ .unregister_event = mem_cgroup_usage_unregister_event,
+ },
+ {
+ .name = "kmem.limit_in_bytes",
+ .private = MEMFILE_PRIVATE(_KMEM, RES_LIMIT),
+ .read_u64 = mem_cgroup_read,
+ .register_event = mem_cgroup_usage_register_event,
+ .unregister_event = mem_cgroup_usage_unregister_event,
+ },
+};
+
+static int register_kmem_files(struct cgroup *cont, struct cgroup_subsys *ss)
+{
+ if (!do_kmem_account)
+ return 0;
+
+ return cgroup_add_files(cont, ss, kmem_cgroup_files,
+ ARRAY_SIZE(kmem_cgroup_files));
+};
+
+#else
+static int register_kmem_files(struct cgroup *cont, struct cgroup_subsys *ss)
+{
+ return 0;
+}
+#endif
+
static int alloc_mem_cgroup_per_zone_info(struct mem_cgroup *mem, int node)
{
struct mem_cgroup_per_node *pn;
@@ -5075,6 +5154,7 @@ mem_cgroup_create(struct cgroup_subsys *ss, struct cgroup *cont)
if (parent && parent->use_hierarchy) {
res_counter_init(&mem->res, &parent->res);
res_counter_init(&mem->memsw, &parent->memsw);
+ res_counter_init(&mem->kmem, &parent->kmem);
/*
* We increment refcnt of the parent to ensure that we can
* safely access it on res_counter_charge/uncharge.
@@ -5085,6 +5165,7 @@ mem_cgroup_create(struct cgroup_subsys *ss, struct cgroup *cont)
} else {
res_counter_init(&mem->res, NULL);
res_counter_init(&mem->memsw, NULL);
+ res_counter_init(&mem->kmem, NULL);
}
mem->last_scanned_child = 0;
mem->last_scanned_node = MAX_NUMNODES;
@@ -5129,6 +5210,10 @@ static int mem_cgroup_populate(struct cgroup_subsys *ss,
if (!ret)
ret = register_memsw_files(cont, ss);
+
+ if (!ret)
+ ret = register_kmem_files(cont, ss);
+
return ret;
}
@@ -5665,3 +5750,17 @@ static int __init enable_swap_account(char *s)
__setup("swapaccount=", enable_swap_account);
#endif
+
+#ifdef CONFIG_CGROUP_MEM_RES_CTLR_KMEM
+static int __init disable_kmem_account(char *s)
+{
+ /* consider enabled if no parameter or 1 is given */
+ if (!strcmp(s, "1"))
+ do_kmem_account = 1;
+ else if (!strcmp(s, "0"))
+ do_kmem_account = 0;
+ return 1;
+}
+__setup("kmemaccount=", disable_kmem_account);
+
+#endif
--
1.7.6
--
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^ permalink raw reply related [flat|nested] 26+ messages in thread* Re: [PATCH v2 1/7] Basic kernel memory functionality for the Memory Controller
2011-09-15 1:46 ` [PATCH v2 1/7] Basic kernel memory functionality for the Memory Controller Glauber Costa
@ 2011-09-17 17:45 ` Kirill A. Shutemov
2011-09-18 3:39 ` Glauber Costa
0 siblings, 1 reply; 26+ messages in thread
From: Kirill A. Shutemov @ 2011-09-17 17:45 UTC (permalink / raw)
To: Glauber Costa
Cc: linux-kernel, paul, lizf, kamezawa.hiroyu, ebiederm, davem,
gthelen, netdev, linux-mm
On Wed, Sep 14, 2011 at 10:46:09PM -0300, Glauber Costa wrote:
> This patch lays down the foundation for the kernel memory component
> of the Memory Controller.
>
> As of today, I am only laying down the following files:
>
> * memory.independent_kmem_limit
> * memory.kmem.limit_in_bytes (currently ignored)
> * memory.kmem.usage_in_bytes (always zero)
>
> Signed-off-by: Glauber Costa <glommer@parallels.com>
> CC: Paul Menage <paul@paulmenage.org>
> CC: Greg Thelen <gthelen@google.com>
> ---
> Documentation/cgroups/memory.txt | 29 ++++++++++-
> init/Kconfig | 11 ++++
> mm/memcontrol.c | 105 ++++++++++++++++++++++++++++++++++++-
> 3 files changed, 140 insertions(+), 5 deletions(-)
>
> diff --git a/Documentation/cgroups/memory.txt b/Documentation/cgroups/memory.txt
> index 6f3c598..ca58eff 100644
> --- a/Documentation/cgroups/memory.txt
> +++ b/Documentation/cgroups/memory.txt
> @@ -44,8 +44,9 @@ Features:
> - oom-killer disable knob and oom-notifier
> - Root cgroup has no limit controls.
>
> - Kernel memory and Hugepages are not under control yet. We just manage
> - pages on LRU. To add more controls, we have to take care of performance.
> + Hugepages is not under control yet. We just manage pages on LRU. To add more
> + controls, we have to take care of performance. Kernel memory support is work
> + in progress, and the current version provides basically functionality.
>
> Brief summary of control files.
>
> @@ -56,8 +57,11 @@ Brief summary of control files.
> (See 5.5 for details)
> memory.memsw.usage_in_bytes # show current res_counter usage for memory+Swap
> (See 5.5 for details)
> + memory.kmem.usage_in_bytes # show current res_counter usage for kmem only.
> + (See 2.7 for details)
> memory.limit_in_bytes # set/show limit of memory usage
> memory.memsw.limit_in_bytes # set/show limit of memory+Swap usage
> + memory.kmem.limit_in_bytes # if allowed, set/show limit of kernel memory
> memory.failcnt # show the number of memory usage hits limits
> memory.memsw.failcnt # show the number of memory+Swap hits limits
> memory.max_usage_in_bytes # show max memory usage recorded
> @@ -72,6 +76,9 @@ Brief summary of control files.
> memory.oom_control # set/show oom controls.
> memory.numa_stat # show the number of memory usage per numa node
>
> + memory.independent_kmem_limit # select whether or not kernel memory limits are
> + independent of user limits
> +
> 1. History
>
> The memory controller has a long history. A request for comments for the memory
> @@ -255,6 +262,24 @@ When oom event notifier is registered, event will be delivered.
> per-zone-per-cgroup LRU (cgroup's private LRU) is just guarded by
> zone->lru_lock, it has no lock of its own.
>
> +2.7 Kernel Memory Extension (CONFIG_CGROUP_MEM_RES_CTLR_KMEM)
> +
> + With the Kernel memory extension, the Memory Controller is able to limit
> +the amount of kernel memory used by the system. Kernel memory is fundamentally
> +different than user memory, since it can't be swapped out, which makes it
> +possible to DoS the system by consuming too much of this precious resource.
> +
> +Memory limits as specified by the standard Memory Controller may or may not
> +take kernel memory into consideration. This is achieved through the file
> +memory.independent_kmem_limit. A Value different than 0 will allow for kernel
> +memory to be controlled separately.
> +
> +When kernel memory limits are not independent, the limit values set in
> +memory.kmem files are ignored.
> +
> +Currently no soft limit is implemented for kernel memory. It is future work
> +to trigger slab reclaim when those limits are reached.
> +
> 3. User Interface
>
> 0. Configuration
> diff --git a/init/Kconfig b/init/Kconfig
> index d627783..49e5839 100644
> --- a/init/Kconfig
> +++ b/init/Kconfig
> @@ -689,6 +689,17 @@ config CGROUP_MEM_RES_CTLR_SWAP_ENABLED
> For those who want to have the feature enabled by default should
> select this option (if, for some reason, they need to disable it
> then swapaccount=0 does the trick).
> +config CGROUP_MEM_RES_CTLR_KMEM
> + bool "Memory Resource Controller Kernel Memory accounting"
> + depends on CGROUP_MEM_RES_CTLR
> + default y
> + help
> + The Kernel Memory extension for Memory Resource Controller can limit
> + the amount of memory used by kernel objects in the system. Those are
> + fundamentally different from the entities handled by the standard
> + Memory Controller, which are page-based, and can be swapped. Users of
> + the kmem extension can use it to guarantee that no group of processes
> + will ever exhaust kernel resources alone.
>
> config CGROUP_PERF
> bool "Enable perf_event per-cpu per-container group (cgroup) monitoring"
> diff --git a/mm/memcontrol.c b/mm/memcontrol.c
> index ebd1e86..1c5d01a 100644
> --- a/mm/memcontrol.c
> +++ b/mm/memcontrol.c
> @@ -73,7 +73,11 @@ static int really_do_swap_account __initdata = 0;
> #define do_swap_account (0)
> #endif
>
> -
> +#ifdef CONFIG_CGROUP_MEM_RES_CTLR_KMEM
> +int do_kmem_account __read_mostly = 1;
> +#else
> +#define do_kmem_account (0)
Redundant brackets.
> +#endif
> /*
> * Statistics for memory cgroup.
> */
> @@ -270,6 +274,10 @@ struct mem_cgroup {
> */
> struct res_counter memsw;
> /*
> + * the counter to account for kmem usage.
> + */
> + struct res_counter kmem;
> + /*
> * Per cgroup active and inactive list, similar to the
> * per zone LRU lists.
> */
> @@ -321,6 +329,11 @@ struct mem_cgroup {
> */
> unsigned long move_charge_at_immigrate;
> /*
> + * Should kernel memory limits be stabilished independently
> + * from user memory ?
> + */
> + int kmem_independent;
> + /*
> * percpu counter.
> */
> struct mem_cgroup_stat_cpu *stat;
> @@ -391,6 +404,7 @@ enum charge_type {
> #define _MEM (0)
> #define _MEMSWAP (1)
> #define _OOM_TYPE (2)
> +#define _KMEM (3)
Ditto. Can we use enum instead?
> #define MEMFILE_PRIVATE(x, val) (((x) << 16) | (val))
> #define MEMFILE_TYPE(val) (((val) >> 16) & 0xffff)
> #define MEMFILE_ATTR(val) ((val) & 0xffff)
> @@ -3941,12 +3955,18 @@ static unsigned long mem_cgroup_recursive_stat(struct mem_cgroup *mem,
> static inline u64 mem_cgroup_usage(struct mem_cgroup *mem, bool swap)
> {
> u64 val;
> + u64 kmem = 0;
Why kmem? It's not only a kernel memory. Why not reuse val?
> +
> + if (!mem->kmem_independent)
> + kmem = res_counter_read_u64(&mem->kmem, RES_USAGE);
This should be inside if (!mem_cgroup_is_root(mem)), I think.
>
> if (!mem_cgroup_is_root(mem)) {
> if (!swap)
> - return res_counter_read_u64(&mem->res, RES_USAGE);
> + kmem += res_counter_read_u64(&mem->res, RES_USAGE);
> else
> - return res_counter_read_u64(&mem->memsw, RES_USAGE);
> + kmem += res_counter_read_u64(&mem->memsw, RES_USAGE);
> +
> + return kmem;
> }
>
> val = mem_cgroup_recursive_stat(mem, MEM_CGROUP_STAT_CACHE);
No kernel memory accounting for root cgroup, right?
> @@ -3979,6 +3999,10 @@ static u64 mem_cgroup_read(struct cgroup *cont, struct cftype *cft)
> else
> val = res_counter_read_u64(&mem->memsw, name);
> break;
> + case _KMEM:
> + val = res_counter_read_u64(&mem->kmem, name);
> + break;
> +
Always zero in root cgroup?
> default:
> BUG();
> break;
> @@ -4756,6 +4780,21 @@ static int mem_cgroup_reset_vmscan_stat(struct cgroup *cgrp,
> return 0;
> }
>
> +#ifdef CONFIG_CGROUP_MEM_RES_CTLR_KMEM
> +static u64 kmem_limit_independent_read(struct cgroup *cont, struct cftype *cft)
> +{
> + return mem_cgroup_from_cont(cont)->kmem_independent;
> +}
> +
> +static int kmem_limit_independent_write(struct cgroup *cont, struct cftype *cft,
> + u64 val)
> +{
> + cgroup_lock();
> + mem_cgroup_from_cont(cont)->kmem_independent = !!val;
> + cgroup_unlock();
> + return 0;
> +}
> +#endif
>
> static struct cftype mem_cgroup_files[] = {
> {
> @@ -4877,6 +4916,46 @@ static int register_memsw_files(struct cgroup *cont, struct cgroup_subsys *ss)
> }
> #endif
>
> +
> +#ifdef CONFIG_CGROUP_MEM_RES_CTLR_KMEM
> +static struct cftype kmem_cgroup_files[] = {
> + {
> + .name = "independent_kmem_limit",
> + .read_u64 = kmem_limit_independent_read,
> + .write_u64 = kmem_limit_independent_write,
> + },
> + {
> + .name = "kmem.usage_in_bytes",
> + .private = MEMFILE_PRIVATE(_KMEM, RES_USAGE),
> + .read_u64 = mem_cgroup_read,
> + .register_event = mem_cgroup_usage_register_event,
> + .unregister_event = mem_cgroup_usage_unregister_event,
mem_cgroup_usage_register_event() doesn't support _KMEM. You will get
BUG(), if try to use.
> + },
> + {
> + .name = "kmem.limit_in_bytes",
> + .private = MEMFILE_PRIVATE(_KMEM, RES_LIMIT),
> + .read_u64 = mem_cgroup_read,
> + .register_event = mem_cgroup_usage_register_event,
> + .unregister_event = mem_cgroup_usage_unregister_event,
events have no sense for limit.
> + },
> +};
> +
> +static int register_kmem_files(struct cgroup *cont, struct cgroup_subsys *ss)
> +{
> + if (!do_kmem_account)
> + return 0;
> +
> + return cgroup_add_files(cont, ss, kmem_cgroup_files,
> + ARRAY_SIZE(kmem_cgroup_files));
> +};
> +
> +#else
> +static int register_kmem_files(struct cgroup *cont, struct cgroup_subsys *ss)
> +{
> + return 0;
> +}
> +#endif
> +
> static int alloc_mem_cgroup_per_zone_info(struct mem_cgroup *mem, int node)
> {
> struct mem_cgroup_per_node *pn;
> @@ -5075,6 +5154,7 @@ mem_cgroup_create(struct cgroup_subsys *ss, struct cgroup *cont)
> if (parent && parent->use_hierarchy) {
> res_counter_init(&mem->res, &parent->res);
> res_counter_init(&mem->memsw, &parent->memsw);
> + res_counter_init(&mem->kmem, &parent->kmem);
> /*
> * We increment refcnt of the parent to ensure that we can
> * safely access it on res_counter_charge/uncharge.
> @@ -5085,6 +5165,7 @@ mem_cgroup_create(struct cgroup_subsys *ss, struct cgroup *cont)
> } else {
> res_counter_init(&mem->res, NULL);
> res_counter_init(&mem->memsw, NULL);
> + res_counter_init(&mem->kmem, NULL);
> }
> mem->last_scanned_child = 0;
> mem->last_scanned_node = MAX_NUMNODES;
> @@ -5129,6 +5210,10 @@ static int mem_cgroup_populate(struct cgroup_subsys *ss,
>
> if (!ret)
> ret = register_memsw_files(cont, ss);
> +
> + if (!ret)
> + ret = register_kmem_files(cont, ss);
> +
> return ret;
> }
>
> @@ -5665,3 +5750,17 @@ static int __init enable_swap_account(char *s)
> __setup("swapaccount=", enable_swap_account);
>
> #endif
> +
> +#ifdef CONFIG_CGROUP_MEM_RES_CTLR_KMEM
> +static int __init disable_kmem_account(char *s)
> +{
> + /* consider enabled if no parameter or 1 is given */
> + if (!strcmp(s, "1"))
> + do_kmem_account = 1;
> + else if (!strcmp(s, "0"))
> + do_kmem_account = 0;
> + return 1;
> +}
> +__setup("kmemaccount=", disable_kmem_account);
> +
> +#endif
> --
> 1.7.6
>
> --
> To unsubscribe, send a message with 'unsubscribe linux-mm' in
> the body to majordomo@kvack.org. For more info on Linux MM,
> see: http://www.linux-mm.org/ .
> Fight unfair telecom internet charges in Canada: sign http://stopthemeter.ca/
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^ permalink raw reply [flat|nested] 26+ messages in thread* Re: [PATCH v2 1/7] Basic kernel memory functionality for the Memory Controller
2011-09-17 17:45 ` Kirill A. Shutemov
@ 2011-09-18 3:39 ` Glauber Costa
2011-09-18 19:05 ` Kirill A. Shutemov
0 siblings, 1 reply; 26+ messages in thread
From: Glauber Costa @ 2011-09-18 3:39 UTC (permalink / raw)
To: Kirill A. Shutemov
Cc: linux-kernel, paul, lizf, kamezawa.hiroyu, ebiederm, davem,
gthelen, netdev, linux-mm
>> struct mem_cgroup_stat_cpu *stat;
>> @@ -391,6 +404,7 @@ enum charge_type {
>> #define _MEM (0)
>> #define _MEMSWAP (1)
>> #define _OOM_TYPE (2)
>> +#define _KMEM (3)
>
> Ditto. Can we use enum instead?
Yes we can (tm)
>> if (!mem_cgroup_is_root(mem)) {
>> if (!swap)
>> - return res_counter_read_u64(&mem->res, RES_USAGE);
>> + kmem += res_counter_read_u64(&mem->res, RES_USAGE);
>> else
>> - return res_counter_read_u64(&mem->memsw, RES_USAGE);
>> + kmem += res_counter_read_u64(&mem->memsw, RES_USAGE);
>> +
>> + return kmem;
>> }
>>
>> val = mem_cgroup_recursive_stat(mem, MEM_CGROUP_STAT_CACHE);
>
> No kernel memory accounting for root cgroup, right?
Not sure. Maybe kernel memory accounting is useful even for root cgroup.
Same as normal memory accounting... what we want to avoid is kernel
memory limits. OTOH, if we are not limiting it anyway, accounting it is
just useless overhead... Even the statistics can then be gathered
through all
the proc files that show slab usage, I guess?
>
>> @@ -3979,6 +3999,10 @@ static u64 mem_cgroup_read(struct cgroup *cont, struct cftype *cft)
>> else
>> val = res_counter_read_u64(&mem->memsw, name);
>> break;
>> + case _KMEM:
>> + val = res_counter_read_u64(&mem->kmem, name);
>> + break;
>> +
>
> Always zero in root cgroup?
Yes, if we're not accounting, it should be zero. WARN_ON, maybe?
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^ permalink raw reply [flat|nested] 26+ messages in thread* Re: [PATCH v2 1/7] Basic kernel memory functionality for the Memory Controller
2011-09-18 3:39 ` Glauber Costa
@ 2011-09-18 19:05 ` Kirill A. Shutemov
2011-09-18 19:11 ` Glauber Costa
0 siblings, 1 reply; 26+ messages in thread
From: Kirill A. Shutemov @ 2011-09-18 19:05 UTC (permalink / raw)
To: Glauber Costa
Cc: linux-kernel, paul, lizf, kamezawa.hiroyu, ebiederm, davem,
gthelen, netdev, linux-mm
On Sun, Sep 18, 2011 at 12:39:12AM -0300, Glauber Costa wrote:
> > No kernel memory accounting for root cgroup, right?
> Not sure. Maybe kernel memory accounting is useful even for root cgroup.
> Same as normal memory accounting... what we want to avoid is kernel
> memory limits. OTOH, if we are not limiting it anyway, accounting it is
> just useless overhead... Even the statistics can then be gathered
> through all
> the proc files that show slab usage, I guess?
It's better to leave root cgroup without accounting. At least for now.
We can add it later if needed.
> >
> >> @@ -3979,6 +3999,10 @@ static u64 mem_cgroup_read(struct cgroup *cont, struct cftype *cft)
> >> else
> >> val = res_counter_read_u64(&mem->memsw, name);
> >> break;
> >> + case _KMEM:
> >> + val = res_counter_read_u64(&mem->kmem, name);
> >> + break;
> >> +
> >
> > Always zero in root cgroup?
>
> Yes, if we're not accounting, it should be zero. WARN_ON, maybe?
-ENOSYS?
--
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--
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^ permalink raw reply [flat|nested] 26+ messages in thread
* Re: [PATCH v2 1/7] Basic kernel memory functionality for the Memory Controller
2011-09-18 19:05 ` Kirill A. Shutemov
@ 2011-09-18 19:11 ` Glauber Costa
2011-09-18 20:39 ` Kirill A. Shutemov
0 siblings, 1 reply; 26+ messages in thread
From: Glauber Costa @ 2011-09-18 19:11 UTC (permalink / raw)
To: Kirill A. Shutemov
Cc: linux-kernel, paul, lizf, kamezawa.hiroyu, ebiederm, davem,
gthelen, netdev, linux-mm
On 09/18/2011 04:05 PM, Kirill A. Shutemov wrote:
> On Sun, Sep 18, 2011 at 12:39:12AM -0300, Glauber Costa wrote:
>>> No kernel memory accounting for root cgroup, right?
>> Not sure. Maybe kernel memory accounting is useful even for root cgroup.
>> Same as normal memory accounting... what we want to avoid is kernel
>> memory limits. OTOH, if we are not limiting it anyway, accounting it is
>> just useless overhead... Even the statistics can then be gathered
>> through all
>> the proc files that show slab usage, I guess?
>
> It's better to leave root cgroup without accounting. At least for now.
> We can add it later if needed.
Fair.
>>>
>>>> @@ -3979,6 +3999,10 @@ static u64 mem_cgroup_read(struct cgroup *cont, struct cftype *cft)
>>>> else
>>>> val = res_counter_read_u64(&mem->memsw, name);
>>>> break;
>>>> + case _KMEM:
>>>> + val = res_counter_read_u64(&mem->kmem, name);
>>>> + break;
>>>> +
>>>
>>> Always zero in root cgroup?
>>
>> Yes, if we're not accounting, it should be zero. WARN_ON, maybe?
>
> -ENOSYS?
>
I'd personally prefer WARN_ON. It is good symmetry from userspace PoV to
always be able to get a value out of it. Also, it something goes wrong
and it is not zero for some reason, this will help us find it.
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^ permalink raw reply [flat|nested] 26+ messages in thread
* Re: [PATCH v2 1/7] Basic kernel memory functionality for the Memory Controller
2011-09-18 19:11 ` Glauber Costa
@ 2011-09-18 20:39 ` Kirill A. Shutemov
2011-09-18 20:40 ` Glauber Costa
0 siblings, 1 reply; 26+ messages in thread
From: Kirill A. Shutemov @ 2011-09-18 20:39 UTC (permalink / raw)
To: Glauber Costa
Cc: linux-kernel, paul, lizf, kamezawa.hiroyu, ebiederm, davem,
gthelen, netdev, linux-mm
On Sun, Sep 18, 2011 at 04:11:21PM -0300, Glauber Costa wrote:
> On 09/18/2011 04:05 PM, Kirill A. Shutemov wrote:
> > On Sun, Sep 18, 2011 at 12:39:12AM -0300, Glauber Costa wrote:
> >>> Always zero in root cgroup?
> >>
> >> Yes, if we're not accounting, it should be zero. WARN_ON, maybe?
> >
> > -ENOSYS?
> >
> I'd personally prefer WARN_ON. It is good symmetry from userspace PoV to
> always be able to get a value out of it. Also, it something goes wrong
> and it is not zero for some reason, this will help us find it.
What's the point to get non-relevant value?
What about -ENOSYS + WARN_ON?
--
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--
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^ permalink raw reply [flat|nested] 26+ messages in thread
* Re: [PATCH v2 1/7] Basic kernel memory functionality for the Memory Controller
2011-09-18 20:39 ` Kirill A. Shutemov
@ 2011-09-18 20:40 ` Glauber Costa
2011-09-18 20:43 ` Kirill A. Shutemov
0 siblings, 1 reply; 26+ messages in thread
From: Glauber Costa @ 2011-09-18 20:40 UTC (permalink / raw)
To: Kirill A. Shutemov
Cc: linux-kernel, paul, lizf, kamezawa.hiroyu, ebiederm, davem,
gthelen, netdev, linux-mm
On 09/18/2011 05:39 PM, Kirill A. Shutemov wrote:
> On Sun, Sep 18, 2011 at 04:11:21PM -0300, Glauber Costa wrote:
>> On 09/18/2011 04:05 PM, Kirill A. Shutemov wrote:
>>> On Sun, Sep 18, 2011 at 12:39:12AM -0300, Glauber Costa wrote:
>>>>> Always zero in root cgroup?
>>>>
>>>> Yes, if we're not accounting, it should be zero. WARN_ON, maybe?
>>>
>>> -ENOSYS?
>>>
>> I'd personally prefer WARN_ON. It is good symmetry from userspace PoV to
>> always be able to get a value out of it. Also, it something goes wrong
>> and it is not zero for some reason, this will help us find it.
>
> What's the point to get non-relevant value?
> What about -ENOSYS + WARN_ON?
>
Well,
what about not even registering kernel memory files for !root cgroup?
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^ permalink raw reply [flat|nested] 26+ messages in thread
* Re: [PATCH v2 1/7] Basic kernel memory functionality for the Memory Controller
2011-09-18 20:40 ` Glauber Costa
@ 2011-09-18 20:43 ` Kirill A. Shutemov
0 siblings, 0 replies; 26+ messages in thread
From: Kirill A. Shutemov @ 2011-09-18 20:43 UTC (permalink / raw)
To: Glauber Costa
Cc: linux-kernel, paul, lizf, kamezawa.hiroyu, ebiederm, davem,
gthelen, netdev, linux-mm
On Sun, Sep 18, 2011 at 05:40:11PM -0300, Glauber Costa wrote:
> On 09/18/2011 05:39 PM, Kirill A. Shutemov wrote:
> > On Sun, Sep 18, 2011 at 04:11:21PM -0300, Glauber Costa wrote:
> >> On 09/18/2011 04:05 PM, Kirill A. Shutemov wrote:
> >>> On Sun, Sep 18, 2011 at 12:39:12AM -0300, Glauber Costa wrote:
> >>>>> Always zero in root cgroup?
> >>>>
> >>>> Yes, if we're not accounting, it should be zero. WARN_ON, maybe?
> >>>
> >>> -ENOSYS?
> >>>
> >> I'd personally prefer WARN_ON. It is good symmetry from userspace PoV to
> >> always be able to get a value out of it. Also, it something goes wrong
> >> and it is not zero for some reason, this will help us find it.
> >
> > What's the point to get non-relevant value?
> > What about -ENOSYS + WARN_ON?
> >
> Well,
>
> what about not even registering kernel memory files for !root cgroup?
ENOENT works for me ;)
--
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--
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^ permalink raw reply [flat|nested] 26+ messages in thread
* [PATCH v2 2/7] socket: initial cgroup code.
2011-09-15 1:46 [PATCH v2 0/7] per-cgroup tcp buffer pressure settings Glauber Costa
2011-09-15 1:46 ` [PATCH v2 1/7] Basic kernel memory functionality for the Memory Controller Glauber Costa
@ 2011-09-15 1:46 ` Glauber Costa
2011-09-17 17:52 ` Kirill A. Shutemov
2011-09-15 1:46 ` [PATCH v2 3/7] foundations of per-cgroup memory pressure controlling Glauber Costa
` (4 subsequent siblings)
6 siblings, 1 reply; 26+ messages in thread
From: Glauber Costa @ 2011-09-15 1:46 UTC (permalink / raw)
To: linux-kernel
Cc: paul, lizf, kamezawa.hiroyu, ebiederm, davem, gthelen, netdev,
linux-mm, Glauber Costa
We aim to control the amount of kernel memory pinned at any
time by tcp sockets. To lay the foundations for this work,
this patch adds a pointer to the kmem_cgroup to the socket
structure.
Signed-off-by: Glauber Costa <glommer@parallels.com>
CC: David S. Miller <davem@davemloft.net>
CC: Hiroyouki Kamezawa <kamezawa.hiroyu@jp.fujitsu.com>
CC: Eric W. Biederman <ebiederm@xmission.com>
---
include/linux/memcontrol.h | 38 ++++++++++++++++++++++++++++++++++++++
include/net/sock.h | 2 ++
net/core/sock.c | 3 +++
3 files changed, 43 insertions(+), 0 deletions(-)
diff --git a/include/linux/memcontrol.h b/include/linux/memcontrol.h
index 3b535db..be457ce 100644
--- a/include/linux/memcontrol.h
+++ b/include/linux/memcontrol.h
@@ -395,5 +395,43 @@ mem_cgroup_print_bad_page(struct page *page)
}
#endif
+#ifdef CONFIG_INET
+#ifdef CONFIG_CGROUP_MEM_RES_CTLR_KMEM
+#include <net/sock.h>
+static inline void sock_update_memcg(struct sock *sk)
+{
+ /* right now a socket spends its whole life in the same cgroup */
+ BUG_ON(sk->sk_cgrp);
+
+ rcu_read_lock();
+ sk->sk_cgrp = mem_cgroup_from_task(current);
+
+ /*
+ * We don't need to protect against anything task-related, because
+ * we are basically stuck with the sock pointer that won't change,
+ * even if the task that originated the socket changes cgroups.
+ *
+ * What we do have to guarantee, is that the chain leading us to
+ * the top level won't change under our noses. Incrementing the
+ * reference count via cgroup_exclude_rmdir guarantees that.
+ */
+ cgroup_exclude_rmdir(mem_cgroup_css(sk->sk_cgrp));
+ rcu_read_unlock();
+}
+
+static inline void sock_release_memcg(struct sock *sk)
+{
+ cgroup_release_and_wakeup_rmdir(mem_cgroup_css(sk->sk_cgrp));
+}
+#else
+#include <net/sock.h>
+static inline void sock_update_memcg(struct sock *sk)
+{
+}
+static inline void sock_release_memcg(struct sock *sk)
+{
+}
+#endif /* CONFIG_CGROUP_MEM_RES_CTLR_KMEM */
+#endif /* CONFIG_INET */
#endif /* _LINUX_MEMCONTROL_H */
diff --git a/include/net/sock.h b/include/net/sock.h
index 8e4062f..afe1467 100644
--- a/include/net/sock.h
+++ b/include/net/sock.h
@@ -228,6 +228,7 @@ struct sock_common {
* @sk_security: used by security modules
* @sk_mark: generic packet mark
* @sk_classid: this socket's cgroup classid
+ * @sk_cgrp: this socket's kernel memory (kmem) cgroup
* @sk_write_pending: a write to stream socket waits to start
* @sk_state_change: callback to indicate change in the state of the sock
* @sk_data_ready: callback to indicate there is data to be processed
@@ -339,6 +340,7 @@ struct sock {
#endif
__u32 sk_mark;
u32 sk_classid;
+ struct mem_cgroup *sk_cgrp;
void (*sk_state_change)(struct sock *sk);
void (*sk_data_ready)(struct sock *sk, int bytes);
void (*sk_write_space)(struct sock *sk);
diff --git a/net/core/sock.c b/net/core/sock.c
index 3449df8..54ec8ac 100644
--- a/net/core/sock.c
+++ b/net/core/sock.c
@@ -125,6 +125,7 @@
#include <net/xfrm.h>
#include <linux/ipsec.h>
#include <net/cls_cgroup.h>
+#include <linux/memcontrol.h>
#include <linux/filter.h>
@@ -1139,6 +1140,7 @@ struct sock *sk_alloc(struct net *net, int family, gfp_t priority,
atomic_set(&sk->sk_wmem_alloc, 1);
sock_update_classid(sk);
+ sock_update_memcg(sk);
}
return sk;
@@ -1170,6 +1172,7 @@ static void __sk_free(struct sock *sk)
put_cred(sk->sk_peer_cred);
put_pid(sk->sk_peer_pid);
put_net(sock_net(sk));
+ sock_release_memcg(sk);
sk_prot_free(sk->sk_prot_creator, sk);
}
--
1.7.6
--
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^ permalink raw reply related [flat|nested] 26+ messages in thread* Re: [PATCH v2 2/7] socket: initial cgroup code.
2011-09-15 1:46 ` [PATCH v2 2/7] socket: initial cgroup code Glauber Costa
@ 2011-09-17 17:52 ` Kirill A. Shutemov
2011-09-18 3:32 ` Glauber Costa
0 siblings, 1 reply; 26+ messages in thread
From: Kirill A. Shutemov @ 2011-09-17 17:52 UTC (permalink / raw)
To: Glauber Costa
Cc: linux-kernel, paul, lizf, kamezawa.hiroyu, ebiederm, davem,
gthelen, netdev, linux-mm
On Wed, Sep 14, 2011 at 10:46:10PM -0300, Glauber Costa wrote:
> We aim to control the amount of kernel memory pinned at any
> time by tcp sockets. To lay the foundations for this work,
> this patch adds a pointer to the kmem_cgroup to the socket
> structure.
>
> Signed-off-by: Glauber Costa <glommer@parallels.com>
> CC: David S. Miller <davem@davemloft.net>
> CC: Hiroyouki Kamezawa <kamezawa.hiroyu@jp.fujitsu.com>
> CC: Eric W. Biederman <ebiederm@xmission.com>
> ---
> include/linux/memcontrol.h | 38 ++++++++++++++++++++++++++++++++++++++
> include/net/sock.h | 2 ++
> net/core/sock.c | 3 +++
> 3 files changed, 43 insertions(+), 0 deletions(-)
>
> diff --git a/include/linux/memcontrol.h b/include/linux/memcontrol.h
> index 3b535db..be457ce 100644
> --- a/include/linux/memcontrol.h
> +++ b/include/linux/memcontrol.h
> @@ -395,5 +395,43 @@ mem_cgroup_print_bad_page(struct page *page)
> }
> #endif
>
> +#ifdef CONFIG_INET
> +#ifdef CONFIG_CGROUP_MEM_RES_CTLR_KMEM
> +#include <net/sock.h>
> +static inline void sock_update_memcg(struct sock *sk)
> +{
> + /* right now a socket spends its whole life in the same cgroup */
> + BUG_ON(sk->sk_cgrp);
> +
> + rcu_read_lock();
> + sk->sk_cgrp = mem_cgroup_from_task(current);
> +
> + /*
> + * We don't need to protect against anything task-related, because
> + * we are basically stuck with the sock pointer that won't change,
> + * even if the task that originated the socket changes cgroups.
> + *
> + * What we do have to guarantee, is that the chain leading us to
> + * the top level won't change under our noses. Incrementing the
> + * reference count via cgroup_exclude_rmdir guarantees that.
> + */
> + cgroup_exclude_rmdir(mem_cgroup_css(sk->sk_cgrp));
> + rcu_read_unlock();
> +}
> +
> +static inline void sock_release_memcg(struct sock *sk)
> +{
> + cgroup_release_and_wakeup_rmdir(mem_cgroup_css(sk->sk_cgrp));
> +}
Do we really need to have these functions in the header?
--
Kirill A. Shutemov
--
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^ permalink raw reply [flat|nested] 26+ messages in thread* Re: [PATCH v2 2/7] socket: initial cgroup code.
2011-09-17 17:52 ` Kirill A. Shutemov
@ 2011-09-18 3:32 ` Glauber Costa
2011-09-18 18:58 ` Kirill A. Shutemov
0 siblings, 1 reply; 26+ messages in thread
From: Glauber Costa @ 2011-09-18 3:32 UTC (permalink / raw)
To: Kirill A. Shutemov
Cc: linux-kernel, paul, lizf, kamezawa.hiroyu, ebiederm, davem,
gthelen, netdev, linux-mm
On 09/17/2011 02:52 PM, Kirill A. Shutemov wrote:
> On Wed, Sep 14, 2011 at 10:46:10PM -0300, Glauber Costa wrote:
>> We aim to control the amount of kernel memory pinned at any
>> time by tcp sockets. To lay the foundations for this work,
>> this patch adds a pointer to the kmem_cgroup to the socket
>> structure.
>>
>> Signed-off-by: Glauber Costa<glommer@parallels.com>
>> CC: David S. Miller<davem@davemloft.net>
>> CC: Hiroyouki Kamezawa<kamezawa.hiroyu@jp.fujitsu.com>
>> CC: Eric W. Biederman<ebiederm@xmission.com>
>> ---
>> include/linux/memcontrol.h | 38 ++++++++++++++++++++++++++++++++++++++
>> include/net/sock.h | 2 ++
>> net/core/sock.c | 3 +++
>> 3 files changed, 43 insertions(+), 0 deletions(-)
>>
>> diff --git a/include/linux/memcontrol.h b/include/linux/memcontrol.h
>> index 3b535db..be457ce 100644
>> --- a/include/linux/memcontrol.h
>> +++ b/include/linux/memcontrol.h
>> @@ -395,5 +395,43 @@ mem_cgroup_print_bad_page(struct page *page)
>> }
>> #endif
>>
>> +#ifdef CONFIG_INET
>> +#ifdef CONFIG_CGROUP_MEM_RES_CTLR_KMEM
>> +#include<net/sock.h>
>> +static inline void sock_update_memcg(struct sock *sk)
>> +{
>> + /* right now a socket spends its whole life in the same cgroup */
>> + BUG_ON(sk->sk_cgrp);
>> +
>> + rcu_read_lock();
>> + sk->sk_cgrp = mem_cgroup_from_task(current);
>> +
>> + /*
>> + * We don't need to protect against anything task-related, because
>> + * we are basically stuck with the sock pointer that won't change,
>> + * even if the task that originated the socket changes cgroups.
>> + *
>> + * What we do have to guarantee, is that the chain leading us to
>> + * the top level won't change under our noses. Incrementing the
>> + * reference count via cgroup_exclude_rmdir guarantees that.
>> + */
>> + cgroup_exclude_rmdir(mem_cgroup_css(sk->sk_cgrp));
>> + rcu_read_unlock();
>> +}
>> +
>> +static inline void sock_release_memcg(struct sock *sk)
>> +{
>> + cgroup_release_and_wakeup_rmdir(mem_cgroup_css(sk->sk_cgrp));
>> +}
>
> Do we really need to have these functions in the header?
>
No, I can move it to memcontrol.c
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^ permalink raw reply [flat|nested] 26+ messages in thread* Re: [PATCH v2 2/7] socket: initial cgroup code.
2011-09-18 3:32 ` Glauber Costa
@ 2011-09-18 18:58 ` Kirill A. Shutemov
0 siblings, 0 replies; 26+ messages in thread
From: Kirill A. Shutemov @ 2011-09-18 18:58 UTC (permalink / raw)
To: Glauber Costa
Cc: linux-kernel, paul, lizf, kamezawa.hiroyu, ebiederm, davem,
gthelen, netdev, linux-mm
On Sun, Sep 18, 2011 at 12:32:27AM -0300, Glauber Costa wrote:
> On 09/17/2011 02:52 PM, Kirill A. Shutemov wrote:
> > Do we really need to have these functions in the header?
> >
> No, I can move it to memcontrol.c
>
Yes, please.
--
Kirill A. Shutemov
--
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^ permalink raw reply [flat|nested] 26+ messages in thread
* [PATCH v2 3/7] foundations of per-cgroup memory pressure controlling.
2011-09-15 1:46 [PATCH v2 0/7] per-cgroup tcp buffer pressure settings Glauber Costa
2011-09-15 1:46 ` [PATCH v2 1/7] Basic kernel memory functionality for the Memory Controller Glauber Costa
2011-09-15 1:46 ` [PATCH v2 2/7] socket: initial cgroup code Glauber Costa
@ 2011-09-15 1:46 ` Glauber Costa
2011-09-15 1:46 ` [PATCH v2 4/7] per-cgroup tcp buffers control Glauber Costa
` (3 subsequent siblings)
6 siblings, 0 replies; 26+ messages in thread
From: Glauber Costa @ 2011-09-15 1:46 UTC (permalink / raw)
To: linux-kernel
Cc: paul, lizf, kamezawa.hiroyu, ebiederm, davem, gthelen, netdev,
linux-mm, Glauber Costa
This patch converts struct sock fields memory_pressure,
memory_allocated, sockets_allocated, and sysctl_mem (now prot_mem)
to function pointers, receiving a struct mem_cgroup parameter.
enter_memory_pressure is kept the same, since all its callers
have socket a context, and the kmem_cgroup can be derived from
the socket itself.
To keep things working, the patch convert all users of those fields
to use acessor functions.
In my benchmarks I didn't see a significant performance difference
with this patch applied compared to a baseline (around 1 % diff, thus
inside error margin).
Signed-off-by: Glauber Costa <glommer@parallels.com>
CC: David S. Miller <davem@davemloft.net>
CC: Hiroyouki Kamezawa <kamezawa.hiroyu@jp.fujitsu.com>
CC: Eric W. Biederman <ebiederm@xmission.com>
---
crypto/af_alg.c | 7 ++-
include/linux/memcontrol.h | 27 ++++++++++
include/net/sock.h | 112 +++++++++++++++++++++++++++++++++++++++++--
include/net/tcp.h | 11 +++--
include/net/udp.h | 3 +-
include/trace/events/sock.h | 10 ++--
mm/memcontrol.c | 51 +++++++++++++++++++-
net/core/sock.c | 62 ++++++++++++++----------
net/decnet/af_decnet.c | 21 +++++++-
net/ipv4/proc.c | 7 ++-
net/ipv4/tcp.c | 27 +++++++++-
net/ipv4/tcp_input.c | 12 ++--
net/ipv4/tcp_ipv4.c | 12 ++--
net/ipv4/tcp_output.c | 2 +-
net/ipv4/tcp_timer.c | 2 +-
net/ipv4/udp.c | 20 ++++++--
net/ipv6/tcp_ipv6.c | 10 ++--
net/ipv6/udp.c | 4 +-
net/sctp/socket.c | 35 ++++++++++---
19 files changed, 350 insertions(+), 85 deletions(-)
diff --git a/crypto/af_alg.c b/crypto/af_alg.c
index ac33d5f..c21351c 100644
--- a/crypto/af_alg.c
+++ b/crypto/af_alg.c
@@ -29,10 +29,15 @@ struct alg_type_list {
static atomic_long_t alg_memory_allocated;
+static atomic_long_t *memory_allocated_alg(struct mem_cgroup *sg)
+{
+ return &alg_memory_allocated;
+}
+
static struct proto alg_proto = {
.name = "ALG",
.owner = THIS_MODULE,
- .memory_allocated = &alg_memory_allocated,
+ .memory_allocated = memory_allocated_alg,
.obj_size = sizeof(struct alg_sock),
};
diff --git a/include/linux/memcontrol.h b/include/linux/memcontrol.h
index be457ce..15c337f 100644
--- a/include/linux/memcontrol.h
+++ b/include/linux/memcontrol.h
@@ -396,8 +396,16 @@ mem_cgroup_print_bad_page(struct page *page)
#endif
#ifdef CONFIG_INET
+struct proto;
+
#ifdef CONFIG_CGROUP_MEM_RES_CTLR_KMEM
+void memcg_sock_mem_alloc(struct mem_cgroup *mem, struct proto *prot,
+ int amt, int *parent_failure);
+void memcg_sock_mem_free(struct mem_cgroup *mem, struct proto *prot, int amt);
+void memcg_sockets_allocated_dec(struct mem_cgroup *mem, struct proto *prot);
+void memcg_sockets_allocated_inc(struct mem_cgroup *mem, struct proto *prot);
#include <net/sock.h>
+
static inline void sock_update_memcg(struct sock *sk)
{
/* right now a socket spends its whole life in the same cgroup */
@@ -424,6 +432,25 @@ static inline void sock_release_memcg(struct sock *sk)
cgroup_release_and_wakeup_rmdir(mem_cgroup_css(sk->sk_cgrp));
}
#else
+/* memcontrol includes sockets.h, that includes memcontrol.h ... */
+static inline void memcg_sock_mem_alloc(struct mem_cgroup *mem,
+ struct proto *prot, int amt,
+ int *parent_failure)
+{
+}
+static inline void memcg_sock_mem_free(struct mem_cgroup *mem,
+ struct proto *prot, int amt)
+{
+}
+static inline void memcg_sockets_allocated_dec(struct mem_cgroup *mem,
+ struct proto *prot)
+{
+}
+static inline void memcg_sockets_allocated_inc(struct mem_cgroup *mem,
+ struct proto *prot)
+{
+}
+
#include <net/sock.h>
static inline void sock_update_memcg(struct sock *sk)
{
diff --git a/include/net/sock.h b/include/net/sock.h
index afe1467..78832f9 100644
--- a/include/net/sock.h
+++ b/include/net/sock.h
@@ -54,6 +54,7 @@
#include <linux/security.h>
#include <linux/slab.h>
#include <linux/uaccess.h>
+#include <linux/cgroup.h>
#include <linux/filter.h>
#include <linux/rculist_nulls.h>
@@ -168,6 +169,8 @@ struct sock_common {
/* public: */
};
+struct mem_cgroup;
+
/**
* struct sock - network layer representation of sockets
* @__sk_common: shared layout with inet_timewait_sock
@@ -786,18 +789,32 @@ struct proto {
unsigned int inuse_idx;
#endif
+ /*
+ * per-cgroup memory tracking:
+ *
+ * The following functions track memory consumption of network buffers
+ * by cgroup (kmem_cgroup) for the current protocol. As of the rest
+ * of the fields in this structure, not all protocols are required
+ * to implement them. Protocols that don't want to do per-cgroup
+ * memory pressure management, can just assume the root cgroup is used.
+ *
+ */
/* Memory pressure */
void (*enter_memory_pressure)(struct sock *sk);
- atomic_long_t *memory_allocated; /* Current allocated memory. */
- struct percpu_counter *sockets_allocated; /* Current number of sockets. */
+ /* Pointer to the current memory allocation of this cgroup. */
+ atomic_long_t *(*memory_allocated)(struct mem_cgroup *sg);
+ /* Pointer to the current number of sockets in this cgroup. */
+ struct percpu_counter *(*sockets_allocated)(struct mem_cgroup *sg);
/*
- * Pressure flag: try to collapse.
+ * Per cgroup pointer to the pressure flag: try to collapse.
* Technical note: it is used by multiple contexts non atomically.
* All the __sk_mem_schedule() is of this nature: accounting
* is strict, actions are advisory and have some latency.
*/
- int *memory_pressure;
- long *sysctl_mem;
+ int *(*memory_pressure)(struct mem_cgroup *sg);
+ /* Pointer to the per-cgroup version of the the sysctl_mem field */
+ long *(*prot_mem)(struct mem_cgroup *sg);
+
int *sysctl_wmem;
int *sysctl_rmem;
int max_header;
@@ -856,6 +873,91 @@ static inline void sk_refcnt_debug_release(const struct sock *sk)
#define sk_refcnt_debug_release(sk) do { } while (0)
#endif /* SOCK_REFCNT_DEBUG */
+#include <linux/memcontrol.h>
+static inline int *sk_memory_pressure(struct sock *sk)
+{
+ int *ret = NULL;
+ if (sk->sk_prot->memory_pressure)
+ ret = sk->sk_prot->memory_pressure(sk->sk_cgrp);
+ return ret;
+}
+
+static inline long sk_prot_mem(struct sock *sk, int index)
+{
+ long *prot = sk->sk_prot->prot_mem(sk->sk_cgrp);
+ return prot[index];
+}
+
+static inline long
+sk_memory_allocated(struct sock *sk)
+{
+ struct proto *prot = sk->sk_prot;
+ struct mem_cgroup *cg = sk->sk_cgrp;
+
+ return atomic_long_read(prot->memory_allocated(cg));
+}
+
+static inline long
+sk_memory_allocated_add(struct sock *sk, int amt, int *parent_failure)
+{
+ struct proto *prot = sk->sk_prot;
+ struct mem_cgroup *cg = sk->sk_cgrp;
+ long allocated;
+
+ allocated = atomic_long_add_return(amt, prot->memory_allocated(cg));
+ memcg_sock_mem_alloc(cg, prot, amt, parent_failure);
+ return allocated;
+}
+
+static inline void
+sk_memory_allocated_sub(struct sock *sk, int amt)
+{
+ struct proto *prot = sk->sk_prot;
+ struct mem_cgroup *cg = sk->sk_cgrp;
+
+ atomic_long_sub(amt, prot->memory_allocated(cg));
+ memcg_sock_mem_free(cg, prot, amt);
+}
+
+static inline void sk_sockets_allocated_dec(struct sock *sk)
+{
+ struct proto *prot = sk->sk_prot;
+ struct mem_cgroup *cg = sk->sk_cgrp;
+
+ percpu_counter_dec(prot->sockets_allocated(cg));
+ memcg_sockets_allocated_dec(cg, prot);
+}
+
+static inline void sk_sockets_allocated_inc(struct sock *sk)
+{
+ struct proto *prot = sk->sk_prot;
+ struct mem_cgroup *cg = sk->sk_cgrp;
+
+ percpu_counter_inc(prot->sockets_allocated(cg));
+ memcg_sockets_allocated_inc(cg, prot);
+}
+
+static inline int
+sk_sockets_allocated_read_positive(struct sock *sk)
+{
+ struct proto *prot = sk->sk_prot;
+ struct mem_cgroup *cg = sk->sk_cgrp;
+
+ return percpu_counter_sum_positive(prot->sockets_allocated(cg));
+}
+
+static inline int
+kcg_sockets_allocated_sum_positive(struct proto *prot, struct mem_cgroup *cg)
+{
+ return percpu_counter_sum_positive(prot->sockets_allocated(cg));
+}
+
+static inline long
+kcg_memory_allocated(struct proto *prot, struct mem_cgroup *cg)
+{
+ return atomic_long_read(prot->memory_allocated(cg));
+}
+
#ifdef CONFIG_PROC_FS
/* Called with local bh disabled */
diff --git a/include/net/tcp.h b/include/net/tcp.h
index 149a415..c835ae3 100644
--- a/include/net/tcp.h
+++ b/include/net/tcp.h
@@ -45,6 +45,7 @@
#include <net/dst.h>
#include <linux/seq_file.h>
+#include <linux/memcontrol.h>
extern struct inet_hashinfo tcp_hashinfo;
@@ -253,9 +254,11 @@ extern int sysctl_tcp_cookie_size;
extern int sysctl_tcp_thin_linear_timeouts;
extern int sysctl_tcp_thin_dupack;
-extern atomic_long_t tcp_memory_allocated;
-extern struct percpu_counter tcp_sockets_allocated;
-extern int tcp_memory_pressure;
+struct mem_cgroup;
+extern long *tcp_sysctl_mem(struct mem_cgroup *sg);
+struct percpu_counter *sockets_allocated_tcp(struct mem_cgroup *sg);
+int *memory_pressure_tcp(struct mem_cgroup *sg);
+atomic_long_t *memory_allocated_tcp(struct mem_cgroup *sg);
/*
* The next routines deal with comparing 32 bit unsigned ints
@@ -286,7 +289,7 @@ static inline bool tcp_too_many_orphans(struct sock *sk, int shift)
}
if (sk->sk_wmem_queued > SOCK_MIN_SNDBUF &&
- atomic_long_read(&tcp_memory_allocated) > sysctl_tcp_mem[2])
+ sk_memory_allocated(sk) > sk_prot_mem(sk, 2))
return true;
return false;
}
diff --git a/include/net/udp.h b/include/net/udp.h
index 67ea6fc..6ed4cc6 100644
--- a/include/net/udp.h
+++ b/include/net/udp.h
@@ -105,7 +105,8 @@ static inline struct udp_hslot *udp_hashslot2(struct udp_table *table,
extern struct proto udp_prot;
-extern atomic_long_t udp_memory_allocated;
+atomic_long_t *memory_allocated_udp(struct mem_cgroup *sg);
+long *udp_sysctl_mem(struct mem_cgroup *sg);
/* sysctl variables for udp */
extern long sysctl_udp_mem[3];
diff --git a/include/trace/events/sock.h b/include/trace/events/sock.h
index 779abb9..12a6083 100644
--- a/include/trace/events/sock.h
+++ b/include/trace/events/sock.h
@@ -37,7 +37,7 @@ TRACE_EVENT(sock_exceed_buf_limit,
TP_STRUCT__entry(
__array(char, name, 32)
- __field(long *, sysctl_mem)
+ __field(long *, prot_mem)
__field(long, allocated)
__field(int, sysctl_rmem)
__field(int, rmem_alloc)
@@ -45,7 +45,7 @@ TRACE_EVENT(sock_exceed_buf_limit,
TP_fast_assign(
strncpy(__entry->name, prot->name, 32);
- __entry->sysctl_mem = prot->sysctl_mem;
+ __entry->prot_mem = sk->sk_prot->prot_mem(sk->sk_cgrp);
__entry->allocated = allocated;
__entry->sysctl_rmem = prot->sysctl_rmem[0];
__entry->rmem_alloc = atomic_read(&sk->sk_rmem_alloc);
@@ -54,9 +54,9 @@ TRACE_EVENT(sock_exceed_buf_limit,
TP_printk("proto:%s sysctl_mem=%ld,%ld,%ld allocated=%ld "
"sysctl_rmem=%d rmem_alloc=%d",
__entry->name,
- __entry->sysctl_mem[0],
- __entry->sysctl_mem[1],
- __entry->sysctl_mem[2],
+ __entry->prot_mem[0],
+ __entry->prot_mem[1],
+ __entry->prot_mem[2],
__entry->allocated,
__entry->sysctl_rmem,
__entry->rmem_alloc)
diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index 1c5d01a..289fc2c 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -345,6 +345,56 @@ struct mem_cgroup {
spinlock_t pcp_counter_lock;
};
+static struct mem_cgroup *parent_mem_cgroup(struct mem_cgroup *mem);
+/* Writing them here to avoid exposing memcg's inner layout */
+#ifdef CONFIG_CGROUP_MEM_RES_CTLR_KMEM
+#ifdef CONFIG_INET
+
+void memcg_sock_mem_alloc(struct mem_cgroup *mem, struct proto *prot,
+ int amt, int *parent_failure)
+{
+ mem = parent_mem_cgroup(mem);
+ for (; mem != NULL; mem = parent_mem_cgroup(mem)) {
+ long alloc;
+ long *prot_mem = prot->prot_mem(mem);
+ /*
+ * Large nestings are not the common case, and stopping in the
+ * middle would be complicated enough, that we bill it all the
+ * way through the root, and if needed, unbill everything later
+ */
+ alloc = atomic_long_add_return(amt,
+ prot->memory_allocated(mem));
+ *parent_failure |= (alloc > prot_mem[2]);
+ }
+}
+EXPORT_SYMBOL(memcg_sock_mem_alloc);
+
+void memcg_sock_mem_free(struct mem_cgroup *mem, struct proto *prot, int amt)
+{
+ mem = parent_mem_cgroup(mem);
+ for (; mem != NULL; mem = parent_mem_cgroup(mem))
+ atomic_long_sub(amt, prot->memory_allocated(mem));
+}
+EXPORT_SYMBOL(memcg_sock_mem_free);
+
+void memcg_sockets_allocated_dec(struct mem_cgroup *mem, struct proto *prot)
+{
+ mem = parent_mem_cgroup(mem);
+ for (; mem; mem = parent_mem_cgroup(mem))
+ percpu_counter_dec(prot->sockets_allocated(mem));
+}
+EXPORT_SYMBOL(memcg_sockets_allocated_dec);
+
+void memcg_sockets_allocated_inc(struct mem_cgroup *mem, struct proto *prot)
+{
+ mem = parent_mem_cgroup(mem);
+ for (; mem; mem = parent_mem_cgroup(mem))
+ percpu_counter_inc(prot->sockets_allocated(mem));
+}
+EXPORT_SYMBOL(memcg_sockets_allocated_inc);
+#endif /* CONFIG_INET */
+#endif /* CONFIG_CGROUP_MEM_RES_CTLR_KMEM */
+
/* Stuffs for move charges at task migration. */
/*
* Types of charges to be moved. "move_charge_at_immitgrate" is treated as a
@@ -423,7 +473,6 @@ enum charge_type {
static void mem_cgroup_get(struct mem_cgroup *mem);
static void mem_cgroup_put(struct mem_cgroup *mem);
-static struct mem_cgroup *parent_mem_cgroup(struct mem_cgroup *mem);
static void drain_all_stock_async(struct mem_cgroup *mem);
static struct mem_cgroup_per_zone *
diff --git a/net/core/sock.c b/net/core/sock.c
index 54ec8ac..338d572 100644
--- a/net/core/sock.c
+++ b/net/core/sock.c
@@ -1291,7 +1291,7 @@ struct sock *sk_clone(const struct sock *sk, const gfp_t priority)
newsk->sk_wq = NULL;
if (newsk->sk_prot->sockets_allocated)
- percpu_counter_inc(newsk->sk_prot->sockets_allocated);
+ sk_sockets_allocated_inc(newsk);
if (sock_flag(newsk, SOCK_TIMESTAMP) ||
sock_flag(newsk, SOCK_TIMESTAMPING_RX_SOFTWARE))
@@ -1682,30 +1682,33 @@ int __sk_mem_schedule(struct sock *sk, int size, int kind)
struct proto *prot = sk->sk_prot;
int amt = sk_mem_pages(size);
long allocated;
+ int *memory_pressure;
+ int parent_failure = 0;
sk->sk_forward_alloc += amt * SK_MEM_QUANTUM;
- allocated = atomic_long_add_return(amt, prot->memory_allocated);
+
+ memory_pressure = sk_memory_pressure(sk);
+ allocated = sk_memory_allocated_add(sk, amt, &parent_failure);
+
+ /* Over hard limit (we, or our parents) */
+ if (parent_failure || (allocated > sk_prot_mem(sk, 2)))
+ goto suppress_allocation;
/* Under limit. */
- if (allocated <= prot->sysctl_mem[0]) {
- if (prot->memory_pressure && *prot->memory_pressure)
- *prot->memory_pressure = 0;
- return 1;
- }
+ if (allocated <= sk_prot_mem(sk, 0))
+ if (memory_pressure && *memory_pressure)
+ *memory_pressure = 0;
/* Under pressure. */
- if (allocated > prot->sysctl_mem[1])
+ if (allocated > sk_prot_mem(sk, 1))
if (prot->enter_memory_pressure)
prot->enter_memory_pressure(sk);
- /* Over hard limit. */
- if (allocated > prot->sysctl_mem[2])
- goto suppress_allocation;
-
/* guarantee minimum buffer size under pressure */
if (kind == SK_MEM_RECV) {
if (atomic_read(&sk->sk_rmem_alloc) < prot->sysctl_rmem[0])
return 1;
+
} else { /* SK_MEM_SEND */
if (sk->sk_type == SOCK_STREAM) {
if (sk->sk_wmem_queued < prot->sysctl_wmem[0])
@@ -1715,13 +1718,13 @@ int __sk_mem_schedule(struct sock *sk, int size, int kind)
return 1;
}
- if (prot->memory_pressure) {
+ if (memory_pressure) {
int alloc;
- if (!*prot->memory_pressure)
+ if (!*memory_pressure)
return 1;
- alloc = percpu_counter_read_positive(prot->sockets_allocated);
- if (prot->sysctl_mem[2] > alloc *
+ alloc = sk_sockets_allocated_read_positive(sk);
+ if (sk_prot_mem(sk, 2) > alloc *
sk_mem_pages(sk->sk_wmem_queued +
atomic_read(&sk->sk_rmem_alloc) +
sk->sk_forward_alloc))
@@ -1744,7 +1747,9 @@ suppress_allocation:
/* Alas. Undo changes. */
sk->sk_forward_alloc -= amt * SK_MEM_QUANTUM;
- atomic_long_sub(amt, prot->memory_allocated);
+
+ sk_memory_allocated_sub(sk, amt);
+
return 0;
}
EXPORT_SYMBOL(__sk_mem_schedule);
@@ -1755,15 +1760,15 @@ EXPORT_SYMBOL(__sk_mem_schedule);
*/
void __sk_mem_reclaim(struct sock *sk)
{
- struct proto *prot = sk->sk_prot;
+ int *memory_pressure = sk_memory_pressure(sk);
- atomic_long_sub(sk->sk_forward_alloc >> SK_MEM_QUANTUM_SHIFT,
- prot->memory_allocated);
+ sk_memory_allocated_sub(sk,
+ sk->sk_forward_alloc >> SK_MEM_QUANTUM_SHIFT);
sk->sk_forward_alloc &= SK_MEM_QUANTUM - 1;
- if (prot->memory_pressure && *prot->memory_pressure &&
- (atomic_long_read(prot->memory_allocated) < prot->sysctl_mem[0]))
- *prot->memory_pressure = 0;
+ if (memory_pressure && *memory_pressure &&
+ (sk_memory_allocated(sk) < sk_prot_mem(sk, 0)))
+ *memory_pressure = 0;
}
EXPORT_SYMBOL(__sk_mem_reclaim);
@@ -2482,13 +2487,20 @@ static char proto_method_implemented(const void *method)
static void proto_seq_printf(struct seq_file *seq, struct proto *proto)
{
+ struct mem_cgroup *cg = mem_cgroup_from_task(current);
+ int *memory_pressure = NULL;
+
+ if (proto->memory_pressure)
+ memory_pressure = proto->memory_pressure(cg);
+
seq_printf(seq, "%-9s %4u %6d %6ld %-3s %6u %-3s %-10s "
"%2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c\n",
proto->name,
proto->obj_size,
sock_prot_inuse_get(seq_file_net(seq), proto),
- proto->memory_allocated != NULL ? atomic_long_read(proto->memory_allocated) : -1L,
- proto->memory_pressure != NULL ? *proto->memory_pressure ? "yes" : "no" : "NI",
+ proto->memory_allocated != NULL ?
+ kcg_memory_allocated(proto, cg) : -1L,
+ memory_pressure != NULL ? *memory_pressure ? "yes" : "no" : "NI",
proto->max_header,
proto->slab == NULL ? "no" : "yes",
module_name(proto->owner),
diff --git a/net/decnet/af_decnet.c b/net/decnet/af_decnet.c
index 19acd00..4752118 100644
--- a/net/decnet/af_decnet.c
+++ b/net/decnet/af_decnet.c
@@ -458,13 +458,28 @@ static void dn_enter_memory_pressure(struct sock *sk)
}
}
+static atomic_long_t *memory_allocated_dn(struct mem_cgroup *sg)
+{
+ return &decnet_memory_allocated;
+}
+
+static int *memory_pressure_dn(struct mem_cgroup *sg)
+{
+ return &dn_memory_pressure;
+}
+
+static long *dn_sysctl_mem(struct mem_cgroup *sg)
+{
+ return sysctl_decnet_mem;
+}
+
static struct proto dn_proto = {
.name = "NSP",
.owner = THIS_MODULE,
.enter_memory_pressure = dn_enter_memory_pressure,
- .memory_pressure = &dn_memory_pressure,
- .memory_allocated = &decnet_memory_allocated,
- .sysctl_mem = sysctl_decnet_mem,
+ .memory_pressure = memory_pressure_dn,
+ .memory_allocated = memory_allocated_dn,
+ .prot_mem = dn_sysctl_mem,
.sysctl_wmem = sysctl_decnet_wmem,
.sysctl_rmem = sysctl_decnet_rmem,
.max_header = DN_MAX_NSP_DATA_HEADER + 64,
diff --git a/net/ipv4/proc.c b/net/ipv4/proc.c
index b14ec7d..ba56702 100644
--- a/net/ipv4/proc.c
+++ b/net/ipv4/proc.c
@@ -52,20 +52,21 @@ static int sockstat_seq_show(struct seq_file *seq, void *v)
{
struct net *net = seq->private;
int orphans, sockets;
+ struct mem_cgroup *cg = mem_cgroup_from_task(current);
local_bh_disable();
orphans = percpu_counter_sum_positive(&tcp_orphan_count);
- sockets = percpu_counter_sum_positive(&tcp_sockets_allocated);
+ sockets = kcg_sockets_allocated_sum_positive(&tcp_prot, cg);
local_bh_enable();
socket_seq_show(seq);
seq_printf(seq, "TCP: inuse %d orphan %d tw %d alloc %d mem %ld\n",
sock_prot_inuse_get(net, &tcp_prot), orphans,
tcp_death_row.tw_count, sockets,
- atomic_long_read(&tcp_memory_allocated));
+ kcg_memory_allocated(&tcp_prot, cg));
seq_printf(seq, "UDP: inuse %d mem %ld\n",
sock_prot_inuse_get(net, &udp_prot),
- atomic_long_read(&udp_memory_allocated));
+ kcg_memory_allocated(&udp_prot, cg));
seq_printf(seq, "UDPLITE: inuse %d\n",
sock_prot_inuse_get(net, &udplite_prot));
seq_printf(seq, "RAW: inuse %d\n",
diff --git a/net/ipv4/tcp.c b/net/ipv4/tcp.c
index 46febca..452245f 100644
--- a/net/ipv4/tcp.c
+++ b/net/ipv4/tcp.c
@@ -291,13 +291,11 @@ EXPORT_SYMBOL(sysctl_tcp_rmem);
EXPORT_SYMBOL(sysctl_tcp_wmem);
atomic_long_t tcp_memory_allocated; /* Current allocated memory. */
-EXPORT_SYMBOL(tcp_memory_allocated);
/*
* Current number of TCP sockets.
*/
struct percpu_counter tcp_sockets_allocated;
-EXPORT_SYMBOL(tcp_sockets_allocated);
/*
* TCP splice context
@@ -315,7 +313,18 @@ struct tcp_splice_state {
* is strict, actions are advisory and have some latency.
*/
int tcp_memory_pressure __read_mostly;
-EXPORT_SYMBOL(tcp_memory_pressure);
+
+int *memory_pressure_tcp(struct mem_cgroup *sg)
+{
+ return &tcp_memory_pressure;
+}
+EXPORT_SYMBOL(memory_pressure_tcp);
+
+struct percpu_counter *sockets_allocated_tcp(struct mem_cgroup *sg)
+{
+ return &tcp_sockets_allocated;
+}
+EXPORT_SYMBOL(sockets_allocated_tcp);
void tcp_enter_memory_pressure(struct sock *sk)
{
@@ -326,6 +335,18 @@ void tcp_enter_memory_pressure(struct sock *sk)
}
EXPORT_SYMBOL(tcp_enter_memory_pressure);
+long *tcp_sysctl_mem(struct mem_cgroup *sg)
+{
+ return sysctl_tcp_mem;
+}
+EXPORT_SYMBOL(tcp_sysctl_mem);
+
+atomic_long_t *memory_allocated_tcp(struct mem_cgroup *sg)
+{
+ return &tcp_memory_allocated;
+}
+EXPORT_SYMBOL(memory_allocated_tcp);
+
/* Convert seconds to retransmits based on initial and max timeout */
static u8 secs_to_retrans(int seconds, int timeout, int rto_max)
{
diff --git a/net/ipv4/tcp_input.c b/net/ipv4/tcp_input.c
index ea0d218..3f17423 100644
--- a/net/ipv4/tcp_input.c
+++ b/net/ipv4/tcp_input.c
@@ -316,7 +316,7 @@ static void tcp_grow_window(struct sock *sk, struct sk_buff *skb)
/* Check #1 */
if (tp->rcv_ssthresh < tp->window_clamp &&
(int)tp->rcv_ssthresh < tcp_space(sk) &&
- !tcp_memory_pressure) {
+ !sk_memory_pressure(sk)) {
int incr;
/* Check #2. Increase window, if skb with such overhead
@@ -398,8 +398,8 @@ static void tcp_clamp_window(struct sock *sk)
if (sk->sk_rcvbuf < sysctl_tcp_rmem[2] &&
!(sk->sk_userlocks & SOCK_RCVBUF_LOCK) &&
- !tcp_memory_pressure &&
- atomic_long_read(&tcp_memory_allocated) < sysctl_tcp_mem[0]) {
+ !sk_memory_pressure(sk) &&
+ sk_memory_allocated(sk) < sk_prot_mem(sk, 0)) {
sk->sk_rcvbuf = min(atomic_read(&sk->sk_rmem_alloc),
sysctl_tcp_rmem[2]);
}
@@ -4806,7 +4806,7 @@ static int tcp_prune_queue(struct sock *sk)
if (atomic_read(&sk->sk_rmem_alloc) >= sk->sk_rcvbuf)
tcp_clamp_window(sk);
- else if (tcp_memory_pressure)
+ else if (sk_memory_pressure(sk))
tp->rcv_ssthresh = min(tp->rcv_ssthresh, 4U * tp->advmss);
tcp_collapse_ofo_queue(sk);
@@ -4872,11 +4872,11 @@ static int tcp_should_expand_sndbuf(struct sock *sk)
return 0;
/* If we are under global TCP memory pressure, do not expand. */
- if (tcp_memory_pressure)
+ if (sk_memory_pressure(sk))
return 0;
/* If we are under soft global TCP memory pressure, do not expand. */
- if (atomic_long_read(&tcp_memory_allocated) >= sysctl_tcp_mem[0])
+ if (sk_memory_allocated(sk) >= sk_prot_mem(sk, 0))
return 0;
/* If we filled the congestion window, do not expand. */
diff --git a/net/ipv4/tcp_ipv4.c b/net/ipv4/tcp_ipv4.c
index 1c12b8e..cbb0d5e 100644
--- a/net/ipv4/tcp_ipv4.c
+++ b/net/ipv4/tcp_ipv4.c
@@ -1901,7 +1901,7 @@ static int tcp_v4_init_sock(struct sock *sk)
sk->sk_rcvbuf = sysctl_tcp_rmem[1];
local_bh_disable();
- percpu_counter_inc(&tcp_sockets_allocated);
+ sk_sockets_allocated_inc(sk);
local_bh_enable();
return 0;
@@ -1957,7 +1957,7 @@ void tcp_v4_destroy_sock(struct sock *sk)
tp->cookie_values = NULL;
}
- percpu_counter_dec(&tcp_sockets_allocated);
+ sk_sockets_allocated_dec(sk);
}
EXPORT_SYMBOL(tcp_v4_destroy_sock);
@@ -2598,11 +2598,11 @@ struct proto tcp_prot = {
.unhash = inet_unhash,
.get_port = inet_csk_get_port,
.enter_memory_pressure = tcp_enter_memory_pressure,
- .sockets_allocated = &tcp_sockets_allocated,
+ .memory_pressure = memory_pressure_tcp,
+ .sockets_allocated = sockets_allocated_tcp,
.orphan_count = &tcp_orphan_count,
- .memory_allocated = &tcp_memory_allocated,
- .memory_pressure = &tcp_memory_pressure,
- .sysctl_mem = sysctl_tcp_mem,
+ .memory_allocated = memory_allocated_tcp,
+ .prot_mem = tcp_sysctl_mem,
.sysctl_wmem = sysctl_tcp_wmem,
.sysctl_rmem = sysctl_tcp_rmem,
.max_header = MAX_TCP_HEADER,
diff --git a/net/ipv4/tcp_output.c b/net/ipv4/tcp_output.c
index 882e0b0..06aeb31 100644
--- a/net/ipv4/tcp_output.c
+++ b/net/ipv4/tcp_output.c
@@ -1912,7 +1912,7 @@ u32 __tcp_select_window(struct sock *sk)
if (free_space < (full_space >> 1)) {
icsk->icsk_ack.quick = 0;
- if (tcp_memory_pressure)
+ if (sk_memory_pressure(sk))
tp->rcv_ssthresh = min(tp->rcv_ssthresh,
4U * tp->advmss);
diff --git a/net/ipv4/tcp_timer.c b/net/ipv4/tcp_timer.c
index ecd44b0..2c67617 100644
--- a/net/ipv4/tcp_timer.c
+++ b/net/ipv4/tcp_timer.c
@@ -261,7 +261,7 @@ static void tcp_delack_timer(unsigned long data)
}
out:
- if (tcp_memory_pressure)
+ if (sk_memory_pressure(sk))
sk_mem_reclaim(sk);
out_unlock:
bh_unlock_sock(sk);
diff --git a/net/ipv4/udp.c b/net/ipv4/udp.c
index 1b5a193..cc7627b 100644
--- a/net/ipv4/udp.c
+++ b/net/ipv4/udp.c
@@ -120,9 +120,6 @@ EXPORT_SYMBOL(sysctl_udp_rmem_min);
int sysctl_udp_wmem_min __read_mostly;
EXPORT_SYMBOL(sysctl_udp_wmem_min);
-atomic_long_t udp_memory_allocated;
-EXPORT_SYMBOL(udp_memory_allocated);
-
#define MAX_UDP_PORTS 65536
#define PORTS_PER_CHAIN (MAX_UDP_PORTS / UDP_HTABLE_SIZE_MIN)
@@ -1918,6 +1915,19 @@ unsigned int udp_poll(struct file *file, struct socket *sock, poll_table *wait)
}
EXPORT_SYMBOL(udp_poll);
+static atomic_long_t udp_memory_allocated;
+atomic_long_t *memory_allocated_udp(struct mem_cgroup *sg)
+{
+ return &udp_memory_allocated;
+}
+EXPORT_SYMBOL(memory_allocated_udp);
+
+long *udp_sysctl_mem(struct mem_cgroup *sg)
+{
+ return sysctl_udp_mem;
+}
+EXPORT_SYMBOL(udp_sysctl_mem);
+
struct proto udp_prot = {
.name = "UDP",
.owner = THIS_MODULE,
@@ -1936,8 +1946,8 @@ struct proto udp_prot = {
.unhash = udp_lib_unhash,
.rehash = udp_v4_rehash,
.get_port = udp_v4_get_port,
- .memory_allocated = &udp_memory_allocated,
- .sysctl_mem = sysctl_udp_mem,
+ .memory_allocated = &memory_allocated_udp,
+ .prot_mem = udp_sysctl_mem,
.sysctl_wmem = &sysctl_udp_wmem_min,
.sysctl_rmem = &sysctl_udp_rmem_min,
.obj_size = sizeof(struct udp_sock),
diff --git a/net/ipv6/tcp_ipv6.c b/net/ipv6/tcp_ipv6.c
index d1fb63f..807797a 100644
--- a/net/ipv6/tcp_ipv6.c
+++ b/net/ipv6/tcp_ipv6.c
@@ -2012,7 +2012,7 @@ static int tcp_v6_init_sock(struct sock *sk)
sk->sk_rcvbuf = sysctl_tcp_rmem[1];
local_bh_disable();
- percpu_counter_inc(&tcp_sockets_allocated);
+ sk_sockets_allocated_inc(sk);
local_bh_enable();
return 0;
@@ -2221,11 +2221,11 @@ struct proto tcpv6_prot = {
.unhash = inet_unhash,
.get_port = inet_csk_get_port,
.enter_memory_pressure = tcp_enter_memory_pressure,
- .sockets_allocated = &tcp_sockets_allocated,
- .memory_allocated = &tcp_memory_allocated,
- .memory_pressure = &tcp_memory_pressure,
+ .sockets_allocated = sockets_allocated_tcp,
+ .memory_allocated = memory_allocated_tcp,
+ .memory_pressure = memory_pressure_tcp,
.orphan_count = &tcp_orphan_count,
- .sysctl_mem = sysctl_tcp_mem,
+ .prot_mem = tcp_sysctl_mem,
.sysctl_wmem = sysctl_tcp_wmem,
.sysctl_rmem = sysctl_tcp_rmem,
.max_header = MAX_TCP_HEADER,
diff --git a/net/ipv6/udp.c b/net/ipv6/udp.c
index 29213b5..ef4b5b3 100644
--- a/net/ipv6/udp.c
+++ b/net/ipv6/udp.c
@@ -1465,8 +1465,8 @@ struct proto udpv6_prot = {
.unhash = udp_lib_unhash,
.rehash = udp_v6_rehash,
.get_port = udp_v6_get_port,
- .memory_allocated = &udp_memory_allocated,
- .sysctl_mem = sysctl_udp_mem,
+ .memory_allocated = memory_allocated_udp,
+ .prot_mem = udp_sysctl_mem,
.sysctl_wmem = &sysctl_udp_wmem_min,
.sysctl_rmem = &sysctl_udp_rmem_min,
.obj_size = sizeof(struct udp6_sock),
diff --git a/net/sctp/socket.c b/net/sctp/socket.c
index 836aa63..0ddf561 100644
--- a/net/sctp/socket.c
+++ b/net/sctp/socket.c
@@ -119,11 +119,30 @@ static int sctp_memory_pressure;
static atomic_long_t sctp_memory_allocated;
struct percpu_counter sctp_sockets_allocated;
+static long *sctp_sysctl_mem(struct mem_cgroup *sg)
+{
+ return sysctl_sctp_mem;
+}
+
static void sctp_enter_memory_pressure(struct sock *sk)
{
sctp_memory_pressure = 1;
}
+static int *memory_pressure_sctp(struct mem_cgroup *sg)
+{
+ return &sctp_memory_pressure;
+}
+
+static atomic_long_t *memory_allocated_sctp(struct mem_cgroup *sg)
+{
+ return &sctp_memory_allocated;
+}
+
+static struct percpu_counter *sockets_allocated_sctp(struct mem_cgroup *sg)
+{
+ return &sctp_sockets_allocated;
+}
/* Get the sndbuf space available at the time on the association. */
static inline int sctp_wspace(struct sctp_association *asoc)
@@ -6831,13 +6850,13 @@ struct proto sctp_prot = {
.unhash = sctp_unhash,
.get_port = sctp_get_port,
.obj_size = sizeof(struct sctp_sock),
- .sysctl_mem = sysctl_sctp_mem,
+ .prot_mem = sctp_sysctl_mem,
.sysctl_rmem = sysctl_sctp_rmem,
.sysctl_wmem = sysctl_sctp_wmem,
- .memory_pressure = &sctp_memory_pressure,
+ .memory_pressure = memory_pressure_sctp,
.enter_memory_pressure = sctp_enter_memory_pressure,
- .memory_allocated = &sctp_memory_allocated,
- .sockets_allocated = &sctp_sockets_allocated,
+ .memory_allocated = memory_allocated_sctp,
+ .sockets_allocated = sockets_allocated_sctp,
};
#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
@@ -6863,12 +6882,12 @@ struct proto sctpv6_prot = {
.unhash = sctp_unhash,
.get_port = sctp_get_port,
.obj_size = sizeof(struct sctp6_sock),
- .sysctl_mem = sysctl_sctp_mem,
+ .prot_mem = sctp_sysctl_mem,
.sysctl_rmem = sysctl_sctp_rmem,
.sysctl_wmem = sysctl_sctp_wmem,
- .memory_pressure = &sctp_memory_pressure,
+ .memory_pressure = memory_pressure_sctp,
.enter_memory_pressure = sctp_enter_memory_pressure,
- .memory_allocated = &sctp_memory_allocated,
- .sockets_allocated = &sctp_sockets_allocated,
+ .memory_allocated = memory_allocated_sctp,
+ .sockets_allocated = sockets_allocated_sctp,
};
#endif /* defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) */
--
1.7.6
--
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^ permalink raw reply related [flat|nested] 26+ messages in thread* [PATCH v2 4/7] per-cgroup tcp buffers control
2011-09-15 1:46 [PATCH v2 0/7] per-cgroup tcp buffer pressure settings Glauber Costa
` (2 preceding siblings ...)
2011-09-15 1:46 ` [PATCH v2 3/7] foundations of per-cgroup memory pressure controlling Glauber Costa
@ 2011-09-15 1:46 ` Glauber Costa
2011-09-17 18:11 ` Kirill A. Shutemov
2011-09-28 11:58 ` Andrew Wagin
2011-09-15 1:46 ` [PATCH v2 5/7] per-netns ipv4 sysctl_tcp_mem Glauber Costa
` (2 subsequent siblings)
6 siblings, 2 replies; 26+ messages in thread
From: Glauber Costa @ 2011-09-15 1:46 UTC (permalink / raw)
To: linux-kernel
Cc: paul, lizf, kamezawa.hiroyu, ebiederm, davem, gthelen, netdev,
linux-mm, Glauber Costa
With all the infrastructure in place, this patch implements
per-cgroup control for tcp memory pressure handling.
Signed-off-by: Glauber Costa <glommer@parallels.com>
CC: David S. Miller <davem@davemloft.net>
CC: Hiroyouki Kamezawa <kamezawa.hiroyu@jp.fujitsu.com>
CC: Eric W. Biederman <ebiederm@xmission.com>
---
include/linux/memcontrol.h | 8 +++
include/net/sock.h | 14 +++++-
include/net/tcp.h | 10 ++--
mm/memcontrol.c | 115 +++++++++++++++++++++++++++++++++++++++++++-
net/core/sock.c | 28 ++++++++++-
net/ipv4/tcp.c | 44 ++++++++---------
net/ipv4/tcp_ipv4.c | 14 ++++--
net/ipv6/tcp_ipv6.c | 14 ++++--
8 files changed, 203 insertions(+), 44 deletions(-)
diff --git a/include/linux/memcontrol.h b/include/linux/memcontrol.h
index 15c337f..47e05ba 100644
--- a/include/linux/memcontrol.h
+++ b/include/linux/memcontrol.h
@@ -404,6 +404,14 @@ void memcg_sock_mem_alloc(struct mem_cgroup *mem, struct proto *prot,
void memcg_sock_mem_free(struct mem_cgroup *mem, struct proto *prot, int amt);
void memcg_sockets_allocated_dec(struct mem_cgroup *mem, struct proto *prot);
void memcg_sockets_allocated_inc(struct mem_cgroup *mem, struct proto *prot);
+int tcp_init_cgroup(struct proto *prot, struct cgroup *cgrp,
+ struct cgroup_subsys *ss);
+int tcp_init_cgroup_fill(struct proto *prot, struct cgroup *cgrp,
+ struct cgroup_subsys *ss);
+void tcp_destroy_cgroup(struct proto *prot, struct cgroup *cgrp,
+ struct cgroup_subsys *ss);
+void tcp_destroy_cgroup_fill(struct proto *prot, struct cgroup *cgrp,
+ struct cgroup_subsys *ss);
#include <net/sock.h>
static inline void sock_update_memcg(struct sock *sk)
diff --git a/include/net/sock.h b/include/net/sock.h
index 78832f9..ec3c7fa 100644
--- a/include/net/sock.h
+++ b/include/net/sock.h
@@ -64,6 +64,7 @@
#include <net/dst.h>
#include <net/checksum.h>
+int sockets_populate(struct cgroup *cgrp, struct cgroup_subsys *ss);
/*
* This structure really needs to be cleaned up.
* Most of it is for TCP, and not used by any of
@@ -814,7 +815,18 @@ struct proto {
int *(*memory_pressure)(struct mem_cgroup *sg);
/* Pointer to the per-cgroup version of the the sysctl_mem field */
long *(*prot_mem)(struct mem_cgroup *sg);
-
+ /*
+ * cgroup specific init/deinit functions. Called once for all
+ * protocols that implement it, from cgroups populate function.
+ * This function has to setup any files the protocol want to
+ * appear in the kmem cgroup filesystem.
+ */
+ int (*init_cgroup)(struct proto *prot,
+ struct cgroup *cgrp,
+ struct cgroup_subsys *ss);
+ void (*destroy_cgroup)(struct proto *prot,
+ struct cgroup *cgrp,
+ struct cgroup_subsys *ss);
int *sysctl_wmem;
int *sysctl_rmem;
int max_header;
diff --git a/include/net/tcp.h b/include/net/tcp.h
index c835ae3..ce3c211 100644
--- a/include/net/tcp.h
+++ b/include/net/tcp.h
@@ -255,10 +255,10 @@ extern int sysctl_tcp_thin_linear_timeouts;
extern int sysctl_tcp_thin_dupack;
struct mem_cgroup;
-extern long *tcp_sysctl_mem(struct mem_cgroup *sg);
-struct percpu_counter *sockets_allocated_tcp(struct mem_cgroup *sg);
-int *memory_pressure_tcp(struct mem_cgroup *sg);
-atomic_long_t *memory_allocated_tcp(struct mem_cgroup *sg);
+extern long *tcp_sysctl_mem_nocg(struct mem_cgroup *sg);
+struct percpu_counter *sockets_allocated_tcp_nocg(struct mem_cgroup *sg);
+int *memory_pressure_tcp_nocg(struct mem_cgroup *sg);
+atomic_long_t *memory_allocated_tcp_nocg(struct mem_cgroup *sg);
/*
* The next routines deal with comparing 32 bit unsigned ints
@@ -1002,7 +1002,7 @@ static inline void tcp_openreq_init(struct request_sock *req,
ireq->loc_port = tcp_hdr(skb)->dest;
}
-extern void tcp_enter_memory_pressure(struct sock *sk);
+extern void tcp_enter_memory_pressure_nocg(struct sock *sk);
static inline int keepalive_intvl_when(const struct tcp_sock *tp)
{
diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index 289fc2c..7db430c 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -343,13 +343,21 @@ struct mem_cgroup {
*/
struct mem_cgroup_stat_cpu nocpu_base;
spinlock_t pcp_counter_lock;
+
+ /* per-cgroup tcp memory pressure knobs */
+ atomic_long_t tcp_memory_allocated;
+ struct percpu_counter tcp_sockets_allocated;
+ /* those two are read-mostly, leave them at the end */
+ long tcp_prot_mem[3];
+ int tcp_memory_pressure;
};
static struct mem_cgroup *parent_mem_cgroup(struct mem_cgroup *mem);
/* Writing them here to avoid exposing memcg's inner layout */
#ifdef CONFIG_CGROUP_MEM_RES_CTLR_KMEM
#ifdef CONFIG_INET
-
+#include <net/tcp.h>
+#include <net/ip.h>
void memcg_sock_mem_alloc(struct mem_cgroup *mem, struct proto *prot,
int amt, int *parent_failure)
{
@@ -392,6 +400,102 @@ void memcg_sockets_allocated_inc(struct mem_cgroup *mem, struct proto *prot)
percpu_counter_inc(prot->sockets_allocated(mem));
}
EXPORT_SYMBOL(memcg_sockets_allocated_inc);
+
+static struct mem_cgroup *mem_cgroup_from_cont(struct cgroup *cont);
+/*
+ * Pressure flag: try to collapse.
+ * Technical note: it is used by multiple contexts non atomically.
+ * All the __sk_mem_schedule() is of this nature: accounting
+ * is strict, actions are advisory and have some latency.
+ */
+void tcp_enter_memory_pressure(struct sock *sk)
+{
+ struct mem_cgroup *sg = sk->sk_cgrp;
+ if (!sg->tcp_memory_pressure) {
+ NET_INC_STATS(sock_net(sk), LINUX_MIB_TCPMEMORYPRESSURES);
+ sg->tcp_memory_pressure = 1;
+ }
+}
+
+long *tcp_sysctl_mem(struct mem_cgroup *cg)
+{
+ return cg->tcp_prot_mem;
+}
+
+atomic_long_t *memory_allocated_tcp(struct mem_cgroup *cg)
+{
+ return &(cg->tcp_memory_allocated);
+}
+
+int *memory_pressure_tcp(struct mem_cgroup *sg)
+{
+ return &sg->tcp_memory_pressure;
+}
+
+struct percpu_counter *sockets_allocated_tcp(struct mem_cgroup *sg)
+{
+ return &sg->tcp_sockets_allocated;
+}
+
+/*
+ * For ipv6, we only need to fill in the function pointers (can't initialize
+ * things twice). So keep it separated
+ */
+int tcp_init_cgroup_fill(struct proto *prot, struct cgroup *cgrp,
+ struct cgroup_subsys *ss)
+{
+ prot->enter_memory_pressure = tcp_enter_memory_pressure;
+ prot->memory_allocated = memory_allocated_tcp;
+ prot->prot_mem = tcp_sysctl_mem;
+ prot->sockets_allocated = sockets_allocated_tcp;
+ prot->memory_pressure = memory_pressure_tcp;
+
+ return 0;
+}
+EXPORT_SYMBOL(tcp_init_cgroup_fill);
+
+void tcp_destroy_cgroup_fill(struct proto *prot, struct cgroup *cgrp,
+ struct cgroup_subsys *ss)
+{
+ prot->enter_memory_pressure = tcp_enter_memory_pressure_nocg;
+ prot->memory_allocated = memory_allocated_tcp_nocg;
+ prot->prot_mem = tcp_sysctl_mem_nocg;
+ prot->sockets_allocated = sockets_allocated_tcp_nocg;
+ prot->memory_pressure = memory_pressure_tcp_nocg;
+}
+EXPORT_SYMBOL(tcp_destroy_cgroup_fill);
+
+int tcp_init_cgroup(struct proto *prot, struct cgroup *cgrp,
+ struct cgroup_subsys *ss)
+{
+ struct mem_cgroup *cg = mem_cgroup_from_cont(cgrp);
+ unsigned long limit;
+
+ cg->tcp_memory_pressure = 0;
+ atomic_long_set(&cg->tcp_memory_allocated, 0);
+ percpu_counter_init(&cg->tcp_sockets_allocated, 0);
+
+ limit = nr_free_buffer_pages() / 8;
+ limit = max(limit, 128UL);
+
+ cg->tcp_prot_mem[0] = sysctl_tcp_mem[0];
+ cg->tcp_prot_mem[1] = sysctl_tcp_mem[1];
+ cg->tcp_prot_mem[2] = sysctl_tcp_mem[2];
+
+ tcp_init_cgroup_fill(prot, cgrp, ss);
+ return 0;
+}
+EXPORT_SYMBOL(tcp_init_cgroup);
+
+void tcp_destroy_cgroup(struct proto *prot, struct cgroup *cgrp,
+ struct cgroup_subsys *ss)
+{
+ struct mem_cgroup *cg = mem_cgroup_from_cont(cgrp);
+
+ percpu_counter_destroy(&cg->tcp_sockets_allocated);
+ tcp_destroy_cgroup_fill(prot, cgrp, ss);
+}
+EXPORT_SYMBOL(tcp_destroy_cgroup);
#endif /* CONFIG_INET */
#endif /* CONFIG_CGROUP_MEM_RES_CTLR_KMEM */
@@ -4991,11 +5095,18 @@ static struct cftype kmem_cgroup_files[] = {
static int register_kmem_files(struct cgroup *cont, struct cgroup_subsys *ss)
{
+ int ret;
+
if (!do_kmem_account)
return 0;
- return cgroup_add_files(cont, ss, kmem_cgroup_files,
+ ret = cgroup_add_files(cont, ss, kmem_cgroup_files,
ARRAY_SIZE(kmem_cgroup_files));
+ if (!ret)
+ ret = sockets_populate(cont, ss);
+
+ return ret;
+
};
#else
diff --git a/net/core/sock.c b/net/core/sock.c
index 338d572..78bea26 100644
--- a/net/core/sock.c
+++ b/net/core/sock.c
@@ -135,6 +135,31 @@
#include <net/tcp.h>
#endif
+static DEFINE_RWLOCK(proto_list_lock);
+static LIST_HEAD(proto_list);
+
+int sockets_populate(struct cgroup *cgrp, struct cgroup_subsys *ss)
+{
+ struct proto *proto;
+ int ret = 0;
+
+ read_lock(&proto_list_lock);
+ list_for_each_entry(proto, &proto_list, node) {
+ if (proto->init_cgroup)
+ ret |= proto->init_cgroup(proto, cgrp, ss);
+ }
+ if (!ret)
+ goto out;
+
+ list_for_each_entry_continue_reverse(proto, &proto_list, node)
+ if (proto->destroy_cgroup)
+ proto->destroy_cgroup(proto, cgrp, ss);
+
+out:
+ read_unlock(&proto_list_lock);
+ return ret;
+}
+
/*
* Each address family might have different locking rules, so we have
* one slock key per address family:
@@ -2260,9 +2285,6 @@ void sk_common_release(struct sock *sk)
}
EXPORT_SYMBOL(sk_common_release);
-static DEFINE_RWLOCK(proto_list_lock);
-static LIST_HEAD(proto_list);
-
#ifdef CONFIG_PROC_FS
#define PROTO_INUSE_NR 64 /* should be enough for the first time */
struct prot_inuse {
diff --git a/net/ipv4/tcp.c b/net/ipv4/tcp.c
index 452245f..156b836 100644
--- a/net/ipv4/tcp.c
+++ b/net/ipv4/tcp.c
@@ -290,13 +290,6 @@ EXPORT_SYMBOL(sysctl_tcp_mem);
EXPORT_SYMBOL(sysctl_tcp_rmem);
EXPORT_SYMBOL(sysctl_tcp_wmem);
-atomic_long_t tcp_memory_allocated; /* Current allocated memory. */
-
-/*
- * Current number of TCP sockets.
- */
-struct percpu_counter tcp_sockets_allocated;
-
/*
* TCP splice context
*/
@@ -306,46 +299,49 @@ struct tcp_splice_state {
unsigned int flags;
};
-/*
- * Pressure flag: try to collapse.
- * Technical note: it is used by multiple contexts non atomically.
- * All the __sk_mem_schedule() is of this nature: accounting
- * is strict, actions are advisory and have some latency.
- */
+/* Current number of TCP sockets. */
+struct percpu_counter tcp_sockets_allocated;
+atomic_long_t tcp_memory_allocated; /* Current allocated memory. */
int tcp_memory_pressure __read_mostly;
-int *memory_pressure_tcp(struct mem_cgroup *sg)
+int *memory_pressure_tcp_nocg(struct mem_cgroup *sg)
{
return &tcp_memory_pressure;
}
-EXPORT_SYMBOL(memory_pressure_tcp);
+EXPORT_SYMBOL(memory_pressure_tcp_nocg);
-struct percpu_counter *sockets_allocated_tcp(struct mem_cgroup *sg)
+struct percpu_counter *sockets_allocated_tcp_nocg(struct mem_cgroup *sg)
{
return &tcp_sockets_allocated;
}
-EXPORT_SYMBOL(sockets_allocated_tcp);
+EXPORT_SYMBOL(sockets_allocated_tcp_nocg);
-void tcp_enter_memory_pressure(struct sock *sk)
+/*
+ * Pressure flag: try to collapse.
+ * Technical note: it is used by multiple contexts non atomically.
+ * All the __sk_mem_schedule() is of this nature: accounting
+ * is strict, actions are advisory and have some latency.
+ */
+void tcp_enter_memory_pressure_nocg(struct sock *sk)
{
if (!tcp_memory_pressure) {
NET_INC_STATS(sock_net(sk), LINUX_MIB_TCPMEMORYPRESSURES);
tcp_memory_pressure = 1;
}
}
-EXPORT_SYMBOL(tcp_enter_memory_pressure);
+EXPORT_SYMBOL(tcp_enter_memory_pressure_nocg);
-long *tcp_sysctl_mem(struct mem_cgroup *sg)
+long *tcp_sysctl_mem_nocg(struct mem_cgroup *sg)
{
return sysctl_tcp_mem;
}
-EXPORT_SYMBOL(tcp_sysctl_mem);
+EXPORT_SYMBOL(tcp_sysctl_mem_nocg);
-atomic_long_t *memory_allocated_tcp(struct mem_cgroup *sg)
+atomic_long_t *memory_allocated_tcp_nocg(struct mem_cgroup *sg)
{
return &tcp_memory_allocated;
}
-EXPORT_SYMBOL(memory_allocated_tcp);
+EXPORT_SYMBOL(memory_allocated_tcp_nocg);
/* Convert seconds to retransmits based on initial and max timeout */
static u8 secs_to_retrans(int seconds, int timeout, int rto_max)
@@ -3247,7 +3243,9 @@ void __init tcp_init(void)
BUILD_BUG_ON(sizeof(struct tcp_skb_cb) > sizeof(skb->cb));
+#ifndef CONFIG_CGROUP_MEM_RES_CTLR_KMEM
percpu_counter_init(&tcp_sockets_allocated, 0);
+#endif
percpu_counter_init(&tcp_orphan_count, 0);
tcp_hashinfo.bind_bucket_cachep =
kmem_cache_create("tcp_bind_bucket",
diff --git a/net/ipv4/tcp_ipv4.c b/net/ipv4/tcp_ipv4.c
index cbb0d5e..c857baf 100644
--- a/net/ipv4/tcp_ipv4.c
+++ b/net/ipv4/tcp_ipv4.c
@@ -2597,12 +2597,16 @@ struct proto tcp_prot = {
.hash = inet_hash,
.unhash = inet_unhash,
.get_port = inet_csk_get_port,
- .enter_memory_pressure = tcp_enter_memory_pressure,
- .memory_pressure = memory_pressure_tcp,
- .sockets_allocated = sockets_allocated_tcp,
+ .enter_memory_pressure = tcp_enter_memory_pressure_nocg,
+ .memory_pressure = memory_pressure_tcp_nocg,
+ .sockets_allocated = sockets_allocated_tcp_nocg,
.orphan_count = &tcp_orphan_count,
- .memory_allocated = memory_allocated_tcp,
- .prot_mem = tcp_sysctl_mem,
+ .memory_allocated = memory_allocated_tcp_nocg,
+#ifdef CONFIG_CGROUP_MEM_RES_CTLR_KMEM
+ .init_cgroup = tcp_init_cgroup,
+ .destroy_cgroup = tcp_destroy_cgroup,
+#endif
+ .prot_mem = tcp_sysctl_mem_nocg,
.sysctl_wmem = sysctl_tcp_wmem,
.sysctl_rmem = sysctl_tcp_rmem,
.max_header = MAX_TCP_HEADER,
diff --git a/net/ipv6/tcp_ipv6.c b/net/ipv6/tcp_ipv6.c
index 807797a..b2a2350 100644
--- a/net/ipv6/tcp_ipv6.c
+++ b/net/ipv6/tcp_ipv6.c
@@ -2220,12 +2220,16 @@ struct proto tcpv6_prot = {
.hash = tcp_v6_hash,
.unhash = inet_unhash,
.get_port = inet_csk_get_port,
- .enter_memory_pressure = tcp_enter_memory_pressure,
- .sockets_allocated = sockets_allocated_tcp,
- .memory_allocated = memory_allocated_tcp,
- .memory_pressure = memory_pressure_tcp,
+ .enter_memory_pressure = tcp_enter_memory_pressure_nocg,
+ .sockets_allocated = sockets_allocated_tcp_nocg,
+ .memory_allocated = memory_allocated_tcp_nocg,
+ .memory_pressure = memory_pressure_tcp_nocg,
.orphan_count = &tcp_orphan_count,
- .prot_mem = tcp_sysctl_mem,
+ .prot_mem = tcp_sysctl_mem_nocg,
+#ifdef CONFIG_CGROUP_MEM_RES_CTLR_KMEM
+ .init_cgroup = tcp_init_cgroup_fill,
+ .destroy_cgroup = tcp_destroy_cgroup_fill,
+#endif
.sysctl_wmem = sysctl_tcp_wmem,
.sysctl_rmem = sysctl_tcp_rmem,
.max_header = MAX_TCP_HEADER,
--
1.7.6
--
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^ permalink raw reply related [flat|nested] 26+ messages in thread* Re: [PATCH v2 4/7] per-cgroup tcp buffers control
2011-09-15 1:46 ` [PATCH v2 4/7] per-cgroup tcp buffers control Glauber Costa
@ 2011-09-17 18:11 ` Kirill A. Shutemov
2011-09-17 18:33 ` Cyrill Gorcunov
2011-09-28 11:58 ` Andrew Wagin
1 sibling, 1 reply; 26+ messages in thread
From: Kirill A. Shutemov @ 2011-09-17 18:11 UTC (permalink / raw)
To: Glauber Costa
Cc: linux-kernel, paul, lizf, kamezawa.hiroyu, ebiederm, davem,
gthelen, netdev, linux-mm
On Wed, Sep 14, 2011 at 10:46:12PM -0300, Glauber Costa wrote:
> +int tcp_init_cgroup_fill(struct proto *prot, struct cgroup *cgrp,
> + struct cgroup_subsys *ss)
> +{
> + prot->enter_memory_pressure = tcp_enter_memory_pressure;
> + prot->memory_allocated = memory_allocated_tcp;
> + prot->prot_mem = tcp_sysctl_mem;
> + prot->sockets_allocated = sockets_allocated_tcp;
> + prot->memory_pressure = memory_pressure_tcp;
No fancy formatting, please.
--
Kirill A. Shutemov
--
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^ permalink raw reply [flat|nested] 26+ messages in thread* Re: [PATCH v2 4/7] per-cgroup tcp buffers control
2011-09-17 18:11 ` Kirill A. Shutemov
@ 2011-09-17 18:33 ` Cyrill Gorcunov
2011-09-18 3:32 ` Glauber Costa
2011-09-18 18:58 ` Kirill A. Shutemov
0 siblings, 2 replies; 26+ messages in thread
From: Cyrill Gorcunov @ 2011-09-17 18:33 UTC (permalink / raw)
To: Kirill A. Shutemov
Cc: Glauber Costa, linux-kernel, paul, lizf, kamezawa.hiroyu,
ebiederm, davem, gthelen, netdev, linux-mm
On Sat, Sep 17, 2011 at 09:11:32PM +0300, Kirill A. Shutemov wrote:
> On Wed, Sep 14, 2011 at 10:46:12PM -0300, Glauber Costa wrote:
> > +int tcp_init_cgroup_fill(struct proto *prot, struct cgroup *cgrp,
> > + struct cgroup_subsys *ss)
> > +{
> > + prot->enter_memory_pressure = tcp_enter_memory_pressure;
> > + prot->memory_allocated = memory_allocated_tcp;
> > + prot->prot_mem = tcp_sysctl_mem;
> > + prot->sockets_allocated = sockets_allocated_tcp;
> > + prot->memory_pressure = memory_pressure_tcp;
>
> No fancy formatting, please.
>
What's wrong with having fancy formatting? It's indeed easier to read
when members are assigned this way. It's always up to maintainer to
choose what he prefers, but I see nothing wrong in such style (if only it
doesn't break the style of the whole file).
Cyrill
--
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^ permalink raw reply [flat|nested] 26+ messages in thread* Re: [PATCH v2 4/7] per-cgroup tcp buffers control
2011-09-17 18:33 ` Cyrill Gorcunov
@ 2011-09-18 3:32 ` Glauber Costa
2011-09-18 18:58 ` Kirill A. Shutemov
1 sibling, 0 replies; 26+ messages in thread
From: Glauber Costa @ 2011-09-18 3:32 UTC (permalink / raw)
To: Cyrill Gorcunov
Cc: Kirill A. Shutemov, linux-kernel, paul, lizf, kamezawa.hiroyu,
ebiederm, davem, gthelen, netdev, linux-mm
On 09/17/2011 03:33 PM, Cyrill Gorcunov wrote:
> On Sat, Sep 17, 2011 at 09:11:32PM +0300, Kirill A. Shutemov wrote:
>> On Wed, Sep 14, 2011 at 10:46:12PM -0300, Glauber Costa wrote:
>>> +int tcp_init_cgroup_fill(struct proto *prot, struct cgroup *cgrp,
>>> + struct cgroup_subsys *ss)
>>> +{
>>> + prot->enter_memory_pressure = tcp_enter_memory_pressure;
>>> + prot->memory_allocated = memory_allocated_tcp;
>>> + prot->prot_mem = tcp_sysctl_mem;
>>> + prot->sockets_allocated = sockets_allocated_tcp;
>>> + prot->memory_pressure = memory_pressure_tcp;
>>
>> No fancy formatting, please.
>>
>
> What's wrong with having fancy formatting? It's indeed easier to read
> when members are assigned this way. It's always up to maintainer to
> choose what he prefers, but I see nothing wrong in such style (if only it
> doesn't break the style of the whole file).
>
> Cyrill
I am in agreement with Cyrill, but I really, really don't care...
--
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^ permalink raw reply [flat|nested] 26+ messages in thread* Re: [PATCH v2 4/7] per-cgroup tcp buffers control
2011-09-17 18:33 ` Cyrill Gorcunov
2011-09-18 3:32 ` Glauber Costa
@ 2011-09-18 18:58 ` Kirill A. Shutemov
2011-09-18 19:42 ` Glauber Costa
1 sibling, 1 reply; 26+ messages in thread
From: Kirill A. Shutemov @ 2011-09-18 18:58 UTC (permalink / raw)
To: Cyrill Gorcunov
Cc: Glauber Costa, linux-kernel, paul, lizf, kamezawa.hiroyu,
ebiederm, davem, gthelen, netdev, linux-mm
On Sat, Sep 17, 2011 at 10:33:58PM +0400, Cyrill Gorcunov wrote:
> On Sat, Sep 17, 2011 at 09:11:32PM +0300, Kirill A. Shutemov wrote:
> > On Wed, Sep 14, 2011 at 10:46:12PM -0300, Glauber Costa wrote:
> > > +int tcp_init_cgroup_fill(struct proto *prot, struct cgroup *cgrp,
> > > + struct cgroup_subsys *ss)
> > > +{
> > > + prot->enter_memory_pressure = tcp_enter_memory_pressure;
> > > + prot->memory_allocated = memory_allocated_tcp;
> > > + prot->prot_mem = tcp_sysctl_mem;
> > > + prot->sockets_allocated = sockets_allocated_tcp;
> > > + prot->memory_pressure = memory_pressure_tcp;
> >
> > No fancy formatting, please.
> >
>
> What's wrong with having fancy formatting? It's indeed easier to read
> when members are assigned this way. It's always up to maintainer to
> choose what he prefers, but I see nothing wrong in such style (if only it
> doesn't break the style of the whole file).
You have to remove this indenting if you'll reorganize code (e.g. move
part under if(...)).
IMO, it reduces code maintainability.
--
Kirill A. Shutemov
^ permalink raw reply [flat|nested] 26+ messages in thread* Re: [PATCH v2 4/7] per-cgroup tcp buffers control
2011-09-18 18:58 ` Kirill A. Shutemov
@ 2011-09-18 19:42 ` Glauber Costa
0 siblings, 0 replies; 26+ messages in thread
From: Glauber Costa @ 2011-09-18 19:42 UTC (permalink / raw)
To: Kirill A. Shutemov
Cc: Cyrill Gorcunov, linux-kernel, paul, lizf, kamezawa.hiroyu,
ebiederm, davem, gthelen, netdev, linux-mm
On 09/18/2011 03:58 PM, Kirill A. Shutemov wrote:
> On Sat, Sep 17, 2011 at 10:33:58PM +0400, Cyrill Gorcunov wrote:
>> On Sat, Sep 17, 2011 at 09:11:32PM +0300, Kirill A. Shutemov wrote:
>>> On Wed, Sep 14, 2011 at 10:46:12PM -0300, Glauber Costa wrote:
>>>> +int tcp_init_cgroup_fill(struct proto *prot, struct cgroup *cgrp,
>>>> + struct cgroup_subsys *ss)
>>>> +{
>>>> + prot->enter_memory_pressure = tcp_enter_memory_pressure;
>>>> + prot->memory_allocated = memory_allocated_tcp;
>>>> + prot->prot_mem = tcp_sysctl_mem;
>>>> + prot->sockets_allocated = sockets_allocated_tcp;
>>>> + prot->memory_pressure = memory_pressure_tcp;
>>>
>>> No fancy formatting, please.
>>>
>>
>> What's wrong with having fancy formatting? It's indeed easier to read
>> when members are assigned this way. It's always up to maintainer to
>> choose what he prefers, but I see nothing wrong in such style (if only it
>> doesn't break the style of the whole file).
>
> You have to remove this indenting if you'll reorganize code (e.g. move
> part under if(...)).
> IMO, it reduces code maintainability.
>
As I said, I don't care, so I'll change. But I have to say I disagree
with your statement.
It is a pack of assignments, so if you reorganize this code, two things
can happen:
1) It is not moved to a new ident level -> It keeps being a pack of
assignments, and you don't really need to change it.
2) It is moved to a new ident level -> You have to touch it anyway...
--
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^ permalink raw reply [flat|nested] 26+ messages in thread
* Re: [PATCH v2 4/7] per-cgroup tcp buffers control
2011-09-15 1:46 ` [PATCH v2 4/7] per-cgroup tcp buffers control Glauber Costa
2011-09-17 18:11 ` Kirill A. Shutemov
@ 2011-09-28 11:58 ` Andrew Wagin
2011-09-28 12:11 ` Glauber Costa
1 sibling, 1 reply; 26+ messages in thread
From: Andrew Wagin @ 2011-09-28 11:58 UTC (permalink / raw)
To: Glauber Costa
Cc: linux-kernel, paul, lizf, kamezawa.hiroyu, ebiederm, davem,
gthelen, netdev, linux-mm
* tcp_destroy_cgroup_fill() is executed for each cgroup and
initializes some proto methods. proto_list is global and we can
initialize each proto one time. Do we need this really?
* And when a cgroup is destroyed, it cleans proto methods
(tcp_destroy_cgroup_fill), how other cgroups will work after that?
* What about proto, which is registered when cgroup mounted?
My opinion that we may initialize proto by the following way:
+#ifdef CONFIG_CGROUP_MEM_RES_CTLR_KMEM+ .enter_memory_pressure
= tcp_enter_memory_pressure_nocg,
+ .sockets_allocated = sockets_allocated_tcp_nocg,
+ .memory_allocated = memory_allocated_tcp_nocg,
+ .memory_pressure = memory_pressure_tcp_nocg,
+#else
.enter_memory_pressure = tcp_enter_memory_pressure,
.sockets_allocated = sockets_allocated_tcp,
.memory_allocated = memory_allocated_tcp,
.memory_pressure = memory_pressure_tcp,
+#endif
It should work, because the root memory cgroup always exists.
>+int tcp_init_cgroup_fill(struct proto *prot, struct cgroup *cgrp,
>+ struct cgroup_subsys *ss)
>+{
>+ prot->enter_memory_pressure = tcp_enter_memory_pressure;
>+ prot->memory_allocated = memory_allocated_tcp;
>+ prot->prot_mem = tcp_sysctl_mem;
>+ prot->sockets_allocated = sockets_allocated_tcp;
>+ prot->memory_pressure = memory_pressure_tcp;
>+
>+ return 0;
>+}
> +void tcp_destroy_cgroup_fill(struct proto *prot, struct cgroup *cgrp,
> + struct cgroup_subsys *ss)
> +{
> + prot->enter_memory_pressure = tcp_enter_memory_pressure_nocg;
> + prot->memory_allocated = memory_allocated_tcp_nocg;
> + prot->prot_mem = tcp_sysctl_mem_nocg;
> + prot->sockets_allocated = sockets_allocated_tcp_nocg;
> + prot->memory_pressure = memory_pressure_tcp_nocg;
>
>@@ -2220,12 +2220,16 @@ struct proto tcpv6_prot = {
> .hash = tcp_v6_hash,
> .unhash = inet_unhash,
> .get_port = inet_csk_get_port
> + .enter_memory_pressure = tcp_enter_memory_pressure_nocg,
> + .sockets_allocated = sockets_allocated_tcp_nocg,
> + .memory_allocated = memory_allocated_tcp_nocg,
> + .memory_pressure = memory_pressure_tcp_nocg,
--
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^ permalink raw reply [flat|nested] 26+ messages in thread* Re: [PATCH v2 4/7] per-cgroup tcp buffers control
2011-09-28 11:58 ` Andrew Wagin
@ 2011-09-28 12:11 ` Glauber Costa
0 siblings, 0 replies; 26+ messages in thread
From: Glauber Costa @ 2011-09-28 12:11 UTC (permalink / raw)
To: Andrew Wagin
Cc: linux-kernel, paul, lizf, kamezawa.hiroyu, ebiederm, davem,
gthelen, netdev, linux-mm
On 09/28/2011 08:58 AM, Andrew Wagin wrote:
> * tcp_destroy_cgroup_fill() is executed for each cgroup and
> initializes some proto methods. proto_list is global and we can
> initialize each proto one time. Do we need this really?
>
> * And when a cgroup is destroyed, it cleans proto methods
> (tcp_destroy_cgroup_fill), how other cgroups will work after that?
I've already realized that, and removed destruction from my upcoming
series. Thanks
> * What about proto, which is registered when cgroup mounted?
>
> My opinion that we may initialize proto by the following way:
>
> +#ifdef CONFIG_CGROUP_MEM_RES_CTLR_KMEM+ .enter_memory_pressure
> = tcp_enter_memory_pressure_nocg,
> + .sockets_allocated = sockets_allocated_tcp_nocg,
> + .memory_allocated = memory_allocated_tcp_nocg,
> + .memory_pressure = memory_pressure_tcp_nocg,
> +#else
> .enter_memory_pressure = tcp_enter_memory_pressure,
> .sockets_allocated = sockets_allocated_tcp,
> .memory_allocated = memory_allocated_tcp,
> .memory_pressure = memory_pressure_tcp,
> +#endif
>
> It should work, because the root memory cgroup always exists.
Yeah, I was still doing the initialization through cgroups, but I think
this works.
The reason I was keeping it cgroup's initialization method, was because
we have a parameter that allowed kmem accounting to be disabled.
But Kame suggested we'd remove it, and so I did.
>
>> +int tcp_init_cgroup_fill(struct proto *prot, struct cgroup *cgrp,
>> + struct cgroup_subsys *ss)
>> +{
>> + prot->enter_memory_pressure = tcp_enter_memory_pressure;
>> + prot->memory_allocated = memory_allocated_tcp;
>> + prot->prot_mem = tcp_sysctl_mem;
>> + prot->sockets_allocated = sockets_allocated_tcp;
>> + prot->memory_pressure = memory_pressure_tcp;
>> +
>> + return 0;
>> +}
>
>
>> +void tcp_destroy_cgroup_fill(struct proto *prot, struct cgroup *cgrp,
>> + struct cgroup_subsys *ss)
>> +{
>> + prot->enter_memory_pressure = tcp_enter_memory_pressure_nocg;
>> + prot->memory_allocated = memory_allocated_tcp_nocg;
>> + prot->prot_mem = tcp_sysctl_mem_nocg;
>> + prot->sockets_allocated = sockets_allocated_tcp_nocg;
>> + prot->memory_pressure = memory_pressure_tcp_nocg;
>>
>
>> @@ -2220,12 +2220,16 @@ struct proto tcpv6_prot = {
>> .hash = tcp_v6_hash,
>> .unhash = inet_unhash,
>> .get_port = inet_csk_get_port
>> + .enter_memory_pressure = tcp_enter_memory_pressure_nocg,
>> + .sockets_allocated = sockets_allocated_tcp_nocg,
>> + .memory_allocated = memory_allocated_tcp_nocg,
>> + .memory_pressure = memory_pressure_tcp_nocg,
--
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^ permalink raw reply [flat|nested] 26+ messages in thread
* [PATCH v2 5/7] per-netns ipv4 sysctl_tcp_mem
2011-09-15 1:46 [PATCH v2 0/7] per-cgroup tcp buffer pressure settings Glauber Costa
` (3 preceding siblings ...)
2011-09-15 1:46 ` [PATCH v2 4/7] per-cgroup tcp buffers control Glauber Costa
@ 2011-09-15 1:46 ` Glauber Costa
2011-09-15 1:46 ` [PATCH v2 6/7] tcp buffer limitation: per-cgroup limit Glauber Costa
2011-09-15 1:46 ` [PATCH v2 7/7] Display current tcp memory allocation in kmem cgroup Glauber Costa
6 siblings, 0 replies; 26+ messages in thread
From: Glauber Costa @ 2011-09-15 1:46 UTC (permalink / raw)
To: linux-kernel
Cc: paul, lizf, kamezawa.hiroyu, ebiederm, davem, gthelen, netdev,
linux-mm, Glauber Costa
This patch allows each namespace to independently set up
its levels for tcp memory pressure thresholds. This patch
alone does not buy much: we need to make this values
per group of process somehow. This is achieved in the
patches that follows in this patchset.
Signed-off-by: Glauber Costa <glommer@parallels.com>
CC: David S. Miller <davem@davemloft.net>
CC: Hiroyouki Kamezawa <kamezawa.hiroyu@jp.fujitsu.com>
CC: Eric W. Biederman <ebiederm@xmission.com>
---
include/net/netns/ipv4.h | 1 +
include/net/tcp.h | 1 -
mm/memcontrol.c | 9 +++++--
net/ipv4/sysctl_net_ipv4.c | 51 +++++++++++++++++++++++++++++++++++++------
net/ipv4/tcp.c | 13 ++--------
5 files changed, 54 insertions(+), 21 deletions(-)
diff --git a/include/net/netns/ipv4.h b/include/net/netns/ipv4.h
index d786b4f..bbd023a 100644
--- a/include/net/netns/ipv4.h
+++ b/include/net/netns/ipv4.h
@@ -55,6 +55,7 @@ struct netns_ipv4 {
int current_rt_cache_rebuild_count;
unsigned int sysctl_ping_group_range[2];
+ long sysctl_tcp_mem[3];
atomic_t rt_genid;
atomic_t dev_addr_genid;
diff --git a/include/net/tcp.h b/include/net/tcp.h
index ce3c211..257e1f9 100644
--- a/include/net/tcp.h
+++ b/include/net/tcp.h
@@ -231,7 +231,6 @@ extern int sysctl_tcp_fack;
extern int sysctl_tcp_reordering;
extern int sysctl_tcp_ecn;
extern int sysctl_tcp_dsack;
-extern long sysctl_tcp_mem[3];
extern int sysctl_tcp_wmem[3];
extern int sysctl_tcp_rmem[3];
extern int sysctl_tcp_app_win;
diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index 7db430c..039cb79 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -358,6 +358,8 @@ static struct mem_cgroup *parent_mem_cgroup(struct mem_cgroup *mem);
#ifdef CONFIG_INET
#include <net/tcp.h>
#include <net/ip.h>
+#include <linux/nsproxy.h>
+
void memcg_sock_mem_alloc(struct mem_cgroup *mem, struct proto *prot,
int amt, int *parent_failure)
{
@@ -470,6 +472,7 @@ int tcp_init_cgroup(struct proto *prot, struct cgroup *cgrp,
{
struct mem_cgroup *cg = mem_cgroup_from_cont(cgrp);
unsigned long limit;
+ struct net *net = current->nsproxy->net_ns;
cg->tcp_memory_pressure = 0;
atomic_long_set(&cg->tcp_memory_allocated, 0);
@@ -478,9 +481,9 @@ int tcp_init_cgroup(struct proto *prot, struct cgroup *cgrp,
limit = nr_free_buffer_pages() / 8;
limit = max(limit, 128UL);
- cg->tcp_prot_mem[0] = sysctl_tcp_mem[0];
- cg->tcp_prot_mem[1] = sysctl_tcp_mem[1];
- cg->tcp_prot_mem[2] = sysctl_tcp_mem[2];
+ cg->tcp_prot_mem[0] = net->ipv4.sysctl_tcp_mem[0];
+ cg->tcp_prot_mem[1] = net->ipv4.sysctl_tcp_mem[1];
+ cg->tcp_prot_mem[2] = net->ipv4.sysctl_tcp_mem[2];
tcp_init_cgroup_fill(prot, cgrp, ss);
return 0;
diff --git a/net/ipv4/sysctl_net_ipv4.c b/net/ipv4/sysctl_net_ipv4.c
index 69fd720..bbd67ab 100644
--- a/net/ipv4/sysctl_net_ipv4.c
+++ b/net/ipv4/sysctl_net_ipv4.c
@@ -14,6 +14,7 @@
#include <linux/init.h>
#include <linux/slab.h>
#include <linux/nsproxy.h>
+#include <linux/swap.h>
#include <net/snmp.h>
#include <net/icmp.h>
#include <net/ip.h>
@@ -174,6 +175,36 @@ static int proc_allowed_congestion_control(ctl_table *ctl,
return ret;
}
+static int ipv4_tcp_mem(ctl_table *ctl, int write,
+ void __user *buffer, size_t *lenp,
+ loff_t *ppos)
+{
+ int ret;
+ unsigned long vec[3];
+ struct net *net = current->nsproxy->net_ns;
+
+ ctl_table tmp = {
+ .data = &vec,
+ .maxlen = sizeof(vec),
+ .mode = ctl->mode,
+ };
+
+ if (!write) {
+ ctl->data = &net->ipv4.sysctl_tcp_mem;
+ return proc_doulongvec_minmax(ctl, write, buffer, lenp, ppos);
+ }
+
+ ret = proc_doulongvec_minmax(&tmp, write, buffer, lenp, ppos);
+ if (ret)
+ return ret;
+
+ net->ipv4.sysctl_tcp_mem[0] = vec[0];
+ net->ipv4.sysctl_tcp_mem[1] = vec[1];
+ net->ipv4.sysctl_tcp_mem[2] = vec[2];
+
+ return 0;
+}
+
static struct ctl_table ipv4_table[] = {
{
.procname = "tcp_timestamps",
@@ -433,13 +464,6 @@ static struct ctl_table ipv4_table[] = {
.proc_handler = proc_dointvec
},
{
- .procname = "tcp_mem",
- .data = &sysctl_tcp_mem,
- .maxlen = sizeof(sysctl_tcp_mem),
- .mode = 0644,
- .proc_handler = proc_doulongvec_minmax
- },
- {
.procname = "tcp_wmem",
.data = &sysctl_tcp_wmem,
.maxlen = sizeof(sysctl_tcp_wmem),
@@ -721,6 +745,12 @@ static struct ctl_table ipv4_net_table[] = {
.mode = 0644,
.proc_handler = ipv4_ping_group_range,
},
+ {
+ .procname = "tcp_mem",
+ .maxlen = sizeof(init_net.ipv4.sysctl_tcp_mem),
+ .mode = 0644,
+ .proc_handler = ipv4_tcp_mem,
+ },
{ }
};
@@ -734,6 +764,7 @@ EXPORT_SYMBOL_GPL(net_ipv4_ctl_path);
static __net_init int ipv4_sysctl_init_net(struct net *net)
{
struct ctl_table *table;
+ unsigned long limit;
table = ipv4_net_table;
if (!net_eq(net, &init_net)) {
@@ -769,6 +800,12 @@ static __net_init int ipv4_sysctl_init_net(struct net *net)
net->ipv4.sysctl_rt_cache_rebuild_count = 4;
+ limit = nr_free_buffer_pages() / 8;
+ limit = max(limit, 128UL);
+ net->ipv4.sysctl_tcp_mem[0] = limit / 4 * 3;
+ net->ipv4.sysctl_tcp_mem[1] = limit;
+ net->ipv4.sysctl_tcp_mem[2] = net->ipv4.sysctl_tcp_mem[0] * 2;
+
net->ipv4.ipv4_hdr = register_net_sysctl_table(net,
net_ipv4_ctl_path, table);
if (net->ipv4.ipv4_hdr == NULL)
diff --git a/net/ipv4/tcp.c b/net/ipv4/tcp.c
index 156b836..a94a0f1 100644
--- a/net/ipv4/tcp.c
+++ b/net/ipv4/tcp.c
@@ -282,11 +282,9 @@ int sysctl_tcp_fin_timeout __read_mostly = TCP_FIN_TIMEOUT;
struct percpu_counter tcp_orphan_count;
EXPORT_SYMBOL_GPL(tcp_orphan_count);
-long sysctl_tcp_mem[3] __read_mostly;
int sysctl_tcp_wmem[3] __read_mostly;
int sysctl_tcp_rmem[3] __read_mostly;
-EXPORT_SYMBOL(sysctl_tcp_mem);
EXPORT_SYMBOL(sysctl_tcp_rmem);
EXPORT_SYMBOL(sysctl_tcp_wmem);
@@ -333,7 +331,7 @@ EXPORT_SYMBOL(tcp_enter_memory_pressure_nocg);
long *tcp_sysctl_mem_nocg(struct mem_cgroup *sg)
{
- return sysctl_tcp_mem;
+ return init_net.ipv4.sysctl_tcp_mem;
}
EXPORT_SYMBOL(tcp_sysctl_mem_nocg);
@@ -3296,14 +3294,9 @@ void __init tcp_init(void)
sysctl_tcp_max_orphans = cnt / 2;
sysctl_max_syn_backlog = max(128, cnt / 256);
- limit = nr_free_buffer_pages() / 8;
- limit = max(limit, 128UL);
- sysctl_tcp_mem[0] = limit / 4 * 3;
- sysctl_tcp_mem[1] = limit;
- sysctl_tcp_mem[2] = sysctl_tcp_mem[0] * 2;
-
/* Set per-socket limits to no more than 1/128 the pressure threshold */
- limit = ((unsigned long)sysctl_tcp_mem[1]) << (PAGE_SHIFT - 7);
+ limit = ((unsigned long)init_net.ipv4.sysctl_tcp_mem[1])
+ << (PAGE_SHIFT - 7);
max_share = min(4UL*1024*1024, limit);
sysctl_tcp_wmem[0] = SK_MEM_QUANTUM;
--
1.7.6
--
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^ permalink raw reply related [flat|nested] 26+ messages in thread* [PATCH v2 6/7] tcp buffer limitation: per-cgroup limit
2011-09-15 1:46 [PATCH v2 0/7] per-cgroup tcp buffer pressure settings Glauber Costa
` (4 preceding siblings ...)
2011-09-15 1:46 ` [PATCH v2 5/7] per-netns ipv4 sysctl_tcp_mem Glauber Costa
@ 2011-09-15 1:46 ` Glauber Costa
2011-09-17 12:12 ` Glauber Costa
2011-09-15 1:46 ` [PATCH v2 7/7] Display current tcp memory allocation in kmem cgroup Glauber Costa
6 siblings, 1 reply; 26+ messages in thread
From: Glauber Costa @ 2011-09-15 1:46 UTC (permalink / raw)
To: linux-kernel
Cc: paul, lizf, kamezawa.hiroyu, ebiederm, davem, gthelen, netdev,
linux-mm, Glauber Costa
This patch uses the "tcp_max_mem" field of the kmem_cgroup to
effectively control the amount of kernel memory pinned by a cgroup.
We have to make sure that none of the memory pressure thresholds
specified in the namespace are bigger than the current cgroup.
Signed-off-by: Glauber Costa <glommer@parallels.com>
CC: David S. Miller <davem@davemloft.net>
CC: Hiroyouki Kamezawa <kamezawa.hiroyu@jp.fujitsu.com>
CC: Eric W. Biederman <ebiederm@xmission.com>
---
Documentation/cgroups/memory.txt | 1 +
include/linux/memcontrol.h | 11 ++++++
mm/memcontrol.c | 69 +++++++++++++++++++++++++++++++++++++-
net/ipv4/sysctl_net_ipv4.c | 20 +++++++++++
4 files changed, 100 insertions(+), 1 deletions(-)
diff --git a/Documentation/cgroups/memory.txt b/Documentation/cgroups/memory.txt
index ca58eff..ce825ee 100644
--- a/Documentation/cgroups/memory.txt
+++ b/Documentation/cgroups/memory.txt
@@ -78,6 +78,7 @@ Brief summary of control files.
memory.independent_kmem_limit # select whether or not kernel memory limits are
independent of user limits
+ memory.kmem.tcp.max_memory # set/show hard limit for tcp buf memory
1. History
diff --git a/include/linux/memcontrol.h b/include/linux/memcontrol.h
index 47e05ba..a859399 100644
--- a/include/linux/memcontrol.h
+++ b/include/linux/memcontrol.h
@@ -439,6 +439,10 @@ static inline void sock_release_memcg(struct sock *sk)
{
cgroup_release_and_wakeup_rmdir(mem_cgroup_css(sk->sk_cgrp));
}
+
+unsigned long tcp_max_memory(struct mem_cgroup *cg);
+void tcp_prot_mem(struct mem_cgroup *cg, long val, int idx);
+
#else
/* memcontrol includes sockets.h, that includes memcontrol.h ... */
static inline void memcg_sock_mem_alloc(struct mem_cgroup *mem,
@@ -466,6 +470,13 @@ static inline void sock_update_memcg(struct sock *sk)
static inline void sock_release_memcg(struct sock *sk)
{
}
+static inline unsigned long tcp_max_memory(struct mem_cgroup *cg)
+{
+ return 0;
+}
+static inline void tcp_prot_mem(struct mem_cgroup *cg, long val, int idx)
+{
+}
#endif /* CONFIG_CGROUP_MEM_RES_CTLR_KMEM */
#endif /* CONFIG_INET */
#endif /* _LINUX_MEMCONTROL_H */
diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index 039cb79..b48e517 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -345,6 +345,7 @@ struct mem_cgroup {
spinlock_t pcp_counter_lock;
/* per-cgroup tcp memory pressure knobs */
+ int tcp_max_memory;
atomic_long_t tcp_memory_allocated;
struct percpu_counter tcp_sockets_allocated;
/* those two are read-mostly, leave them at the end */
@@ -439,6 +440,56 @@ struct percpu_counter *sockets_allocated_tcp(struct mem_cgroup *sg)
return &sg->tcp_sockets_allocated;
}
+static int tcp_write_maxmem(struct cgroup *cgrp, struct cftype *cft, u64 val)
+{
+ struct mem_cgroup *sg = mem_cgroup_from_cont(cgrp);
+ struct mem_cgroup *parent = parent_mem_cgroup(sg);
+ struct net *net = current->nsproxy->net_ns;
+ int i;
+
+ if (!cgroup_lock_live_group(cgrp))
+ return -ENODEV;
+
+ /*
+ * We can't allow more memory than our parents. Since this
+ * will be tested for all calls, by induction, there is no need
+ * to test any parent other than our own
+ * */
+ if (parent && (val > parent->tcp_max_memory))
+ val = parent->tcp_max_memory;
+
+ sg->tcp_max_memory = val;
+
+ for (i = 0; i < 3; i++)
+ sg->tcp_prot_mem[i] = min_t(long, val,
+ net->ipv4.sysctl_tcp_mem[i]);
+
+ cgroup_unlock();
+
+ return 0;
+}
+
+static u64 tcp_read_maxmem(struct cgroup *cgrp, struct cftype *cft)
+{
+ struct mem_cgroup *sg = mem_cgroup_from_cont(cgrp);
+ u64 ret;
+
+ if (!cgroup_lock_live_group(cgrp))
+ return -ENODEV;
+ ret = sg->tcp_max_memory;
+
+ cgroup_unlock();
+ return ret;
+}
+
+static struct cftype tcp_files[] = {
+ {
+ .name = "kmem.tcp.max_memory",
+ .write_u64 = tcp_write_maxmem,
+ .read_u64 = tcp_read_maxmem,
+ },
+};
+
/*
* For ipv6, we only need to fill in the function pointers (can't initialize
* things twice). So keep it separated
@@ -471,6 +522,7 @@ int tcp_init_cgroup(struct proto *prot, struct cgroup *cgrp,
struct cgroup_subsys *ss)
{
struct mem_cgroup *cg = mem_cgroup_from_cont(cgrp);
+ struct mem_cgroup *parent = parent_mem_cgroup(cg);
unsigned long limit;
struct net *net = current->nsproxy->net_ns;
@@ -481,12 +533,17 @@ int tcp_init_cgroup(struct proto *prot, struct cgroup *cgrp,
limit = nr_free_buffer_pages() / 8;
limit = max(limit, 128UL);
+ if (parent)
+ cg->tcp_max_memory = parent->tcp_max_memory;
+ else
+ cg->tcp_max_memory = limit * 2;
+
cg->tcp_prot_mem[0] = net->ipv4.sysctl_tcp_mem[0];
cg->tcp_prot_mem[1] = net->ipv4.sysctl_tcp_mem[1];
cg->tcp_prot_mem[2] = net->ipv4.sysctl_tcp_mem[2];
tcp_init_cgroup_fill(prot, cgrp, ss);
- return 0;
+ return cgroup_add_files(cgrp, ss, tcp_files, ARRAY_SIZE(tcp_files));
}
EXPORT_SYMBOL(tcp_init_cgroup);
@@ -499,6 +556,16 @@ void tcp_destroy_cgroup(struct proto *prot, struct cgroup *cgrp,
tcp_destroy_cgroup_fill(prot, cgrp, ss);
}
EXPORT_SYMBOL(tcp_destroy_cgroup);
+
+unsigned long tcp_max_memory(struct mem_cgroup *cg)
+{
+ return cg->tcp_max_memory;
+}
+
+void tcp_prot_mem(struct mem_cgroup *cg, long val, int idx)
+{
+ cg->tcp_prot_mem[idx] = val;
+}
#endif /* CONFIG_INET */
#endif /* CONFIG_CGROUP_MEM_RES_CTLR_KMEM */
diff --git a/net/ipv4/sysctl_net_ipv4.c b/net/ipv4/sysctl_net_ipv4.c
index bbd67ab..cdc35f6 100644
--- a/net/ipv4/sysctl_net_ipv4.c
+++ b/net/ipv4/sysctl_net_ipv4.c
@@ -14,6 +14,7 @@
#include <linux/init.h>
#include <linux/slab.h>
#include <linux/nsproxy.h>
+#include <linux/memcontrol.h>
#include <linux/swap.h>
#include <net/snmp.h>
#include <net/icmp.h>
@@ -182,6 +183,10 @@ static int ipv4_tcp_mem(ctl_table *ctl, int write,
int ret;
unsigned long vec[3];
struct net *net = current->nsproxy->net_ns;
+#ifdef CONFIG_CGROUP_MEM_RES_CTLR_KMEM
+ int i;
+ struct mem_cgroup *cg;
+#endif
ctl_table tmp = {
.data = &vec,
@@ -198,6 +203,21 @@ static int ipv4_tcp_mem(ctl_table *ctl, int write,
if (ret)
return ret;
+#ifdef CONFIG_CGROUP_MEM_RES_CTLR_KMEM
+ rcu_read_lock();
+ cg = mem_cgroup_from_task(current);
+ for (i = 0; i < 3; i++)
+ if (vec[i] > tcp_max_memory(cg)) {
+ rcu_read_unlock();
+ return -EINVAL;
+ }
+
+ tcp_prot_mem(cg, vec[0], 0);
+ tcp_prot_mem(cg, vec[1], 1);
+ tcp_prot_mem(cg, vec[2], 2);
+ rcu_read_unlock();
+#endif
+
net->ipv4.sysctl_tcp_mem[0] = vec[0];
net->ipv4.sysctl_tcp_mem[1] = vec[1];
net->ipv4.sysctl_tcp_mem[2] = vec[2];
--
1.7.6
--
To unsubscribe, send a message with 'unsubscribe linux-mm' in
the body to majordomo@kvack.org. For more info on Linux MM,
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^ permalink raw reply related [flat|nested] 26+ messages in thread* Re: [PATCH v2 6/7] tcp buffer limitation: per-cgroup limit
2011-09-15 1:46 ` [PATCH v2 6/7] tcp buffer limitation: per-cgroup limit Glauber Costa
@ 2011-09-17 12:12 ` Glauber Costa
0 siblings, 0 replies; 26+ messages in thread
From: Glauber Costa @ 2011-09-17 12:12 UTC (permalink / raw)
To: Glauber Costa
Cc: linux-kernel, paul, lizf, kamezawa.hiroyu, ebiederm, davem,
gthelen, netdev, linux-mm
On 09/14/2011 10:46 PM, Glauber Costa wrote:
> This patch uses the "tcp_max_mem" field of the kmem_cgroup to
> effectively control the amount of kernel memory pinned by a cgroup.
>
> We have to make sure that none of the memory pressure thresholds
> specified in the namespace are bigger than the current cgroup.
>
> Signed-off-by: Glauber Costa<glommer@parallels.com>
> CC: David S. Miller<davem@davemloft.net>
> CC: Hiroyouki Kamezawa<kamezawa.hiroyu@jp.fujitsu.com>
> CC: Eric W. Biederman<ebiederm@xmission.com>
> ---
heads up: I found a small problem in a corner case here yesterday.
So I will resubmit this series.
It you guys have any other comments let me know, so I can address them
as well.
^ permalink raw reply [flat|nested] 26+ messages in thread
* [PATCH v2 7/7] Display current tcp memory allocation in kmem cgroup
2011-09-15 1:46 [PATCH v2 0/7] per-cgroup tcp buffer pressure settings Glauber Costa
` (5 preceding siblings ...)
2011-09-15 1:46 ` [PATCH v2 6/7] tcp buffer limitation: per-cgroup limit Glauber Costa
@ 2011-09-15 1:46 ` Glauber Costa
6 siblings, 0 replies; 26+ messages in thread
From: Glauber Costa @ 2011-09-15 1:46 UTC (permalink / raw)
To: linux-kernel
Cc: paul, lizf, kamezawa.hiroyu, ebiederm, davem, gthelen, netdev,
linux-mm, Glauber Costa
This patch introduces kmem.tcp_current_memory file, living in the
kmem_cgroup filesystem. It is a simple read-only file that displays the
amount of kernel memory currently consumed by the cgroup.
Signed-off-by: Glauber Costa <glommer@parallels.com>
CC: David S. Miller <davem@davemloft.net>
CC: Hiroyouki Kamezawa <kamezawa.hiroyu@jp.fujitsu.com>
CC: Eric W. Biederman <ebiederm@xmission.com>
---
Documentation/cgroups/memory.txt | 1 +
mm/memcontrol.c | 17 +++++++++++++++++
2 files changed, 18 insertions(+), 0 deletions(-)
diff --git a/Documentation/cgroups/memory.txt b/Documentation/cgroups/memory.txt
index ce825ee..59d9416 100644
--- a/Documentation/cgroups/memory.txt
+++ b/Documentation/cgroups/memory.txt
@@ -79,6 +79,7 @@ Brief summary of control files.
memory.independent_kmem_limit # select whether or not kernel memory limits are
independent of user limits
memory.kmem.tcp.max_memory # set/show hard limit for tcp buf memory
+ memory.kmem.tcp.current_memory # show current tcp buf memory allocation
1. History
diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index b48e517..dd0121f 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -482,12 +482,29 @@ static u64 tcp_read_maxmem(struct cgroup *cgrp, struct cftype *cft)
return ret;
}
+static u64 tcp_read_curmem(struct cgroup *cgrp, struct cftype *cft)
+{
+ struct mem_cgroup *sg = mem_cgroup_from_cont(cgrp);
+ u64 ret;
+
+ if (!cgroup_lock_live_group(cgrp))
+ return -ENODEV;
+ ret = atomic_long_read(&sg->tcp_memory_allocated);
+
+ cgroup_unlock();
+ return ret;
+}
+
static struct cftype tcp_files[] = {
{
.name = "kmem.tcp.max_memory",
.write_u64 = tcp_write_maxmem,
.read_u64 = tcp_read_maxmem,
},
+ {
+ .name = "kmem.tcp.current_memory",
+ .read_u64 = tcp_read_curmem,
+ },
};
/*
--
1.7.6
--
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the body to majordomo@kvack.org. For more info on Linux MM,
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^ permalink raw reply related [flat|nested] 26+ messages in thread