* [patch] mm: memcg: move pc lookup point to commit_charge()
@ 2012-04-24 19:31 Johannes Weiner
2012-04-24 19:38 ` Johannes Weiner
` (2 more replies)
0 siblings, 3 replies; 4+ messages in thread
From: Johannes Weiner @ 2012-04-24 19:31 UTC (permalink / raw)
To: Andrew Morton; +Cc: linux-mm, cgroups, linux-kernel
None of the callsites actually need the page_cgroup descriptor
themselves, so just pass the page and do the look up in there.
We already had two bugs (6568d4a 'mm: memcg: update the correct soft
limit tree during migration' and 'memcg: fix Bad page state after
replace_page_cache') where the passed page and pc were not referring
to the same page frame.
Signed-off-by: Johannes Weiner <hannes@cmpxchg.org>
Acked-by: Hugh Dickins <hughd@google.com>
Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Cc: Michal Hocko <mhocko@suse.cz>
---
mm/memcontrol.c | 17 +++++------------
1 files changed, 5 insertions(+), 12 deletions(-)
diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index 884e936..1a28dd8 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -2461,10 +2461,10 @@ struct mem_cgroup *try_get_mem_cgroup_from_page(struct page *page)
static void __mem_cgroup_commit_charge(struct mem_cgroup *memcg,
struct page *page,
unsigned int nr_pages,
- struct page_cgroup *pc,
enum charge_type ctype,
bool lrucare)
{
+ struct page_cgroup *pc = lookup_page_cgroup(page);
struct zone *uninitialized_var(zone);
bool was_on_lru = false;
bool anon;
@@ -2701,7 +2701,6 @@ static int mem_cgroup_charge_common(struct page *page, struct mm_struct *mm,
{
struct mem_cgroup *memcg = NULL;
unsigned int nr_pages = 1;
- struct page_cgroup *pc;
bool oom = true;
int ret;
@@ -2715,11 +2714,10 @@ static int mem_cgroup_charge_common(struct page *page, struct mm_struct *mm,
oom = false;
}
- pc = lookup_page_cgroup(page);
ret = __mem_cgroup_try_charge(mm, gfp_mask, nr_pages, &memcg, oom);
if (ret == -ENOMEM)
return ret;
- __mem_cgroup_commit_charge(memcg, page, nr_pages, pc, ctype, false);
+ __mem_cgroup_commit_charge(memcg, page, nr_pages, ctype, false);
return 0;
}
@@ -2816,16 +2814,13 @@ static void
__mem_cgroup_commit_charge_swapin(struct page *page, struct mem_cgroup *memcg,
enum charge_type ctype)
{
- struct page_cgroup *pc;
-
if (mem_cgroup_disabled())
return;
if (!memcg)
return;
cgroup_exclude_rmdir(&memcg->css);
- pc = lookup_page_cgroup(page);
- __mem_cgroup_commit_charge(memcg, page, 1, pc, ctype, true);
+ __mem_cgroup_commit_charge(memcg, page, 1, ctype, true);
/*
* Now swap is on-memory. This means this page may be
* counted both as mem and swap....double count.
@@ -3254,14 +3249,13 @@ int mem_cgroup_prepare_migration(struct page *page,
* page. In the case new page is migrated but not remapped, new page's
* mapcount will be finally 0 and we call uncharge in end_migration().
*/
- pc = lookup_page_cgroup(newpage);
if (PageAnon(page))
ctype = MEM_CGROUP_CHARGE_TYPE_MAPPED;
else if (page_is_file_cache(page))
ctype = MEM_CGROUP_CHARGE_TYPE_CACHE;
else
ctype = MEM_CGROUP_CHARGE_TYPE_SHMEM;
- __mem_cgroup_commit_charge(memcg, newpage, 1, pc, ctype, false);
+ __mem_cgroup_commit_charge(memcg, newpage, 1, ctype, false);
return ret;
}
@@ -3348,8 +3342,7 @@ void mem_cgroup_replace_page_cache(struct page *oldpage,
* the newpage may be on LRU(or pagevec for LRU) already. We lock
* LRU while we overwrite pc->mem_cgroup.
*/
- pc = lookup_page_cgroup(newpage);
- __mem_cgroup_commit_charge(memcg, newpage, 1, pc, type, true);
+ __mem_cgroup_commit_charge(memcg, newpage, 1, type, true);
}
#ifdef CONFIG_DEBUG_VM
--
1.7.7.6
^ permalink raw reply related [flat|nested] 4+ messages in thread
* Re: [patch] mm: memcg: move pc lookup point to commit_charge()
2012-04-24 19:31 [patch] mm: memcg: move pc lookup point to commit_charge() Johannes Weiner
@ 2012-04-24 19:38 ` Johannes Weiner
2012-04-25 8:21 ` Michal Hocko
2012-04-26 2:02 ` KAMEZAWA Hiroyuki
2 siblings, 0 replies; 4+ messages in thread
From: Johannes Weiner @ 2012-04-24 19:38 UTC (permalink / raw)
To: Andrew Morton
Cc: Hugh Dickins, KAMEZAWA Hiroyuki, Michal Hocko, linux-mm, cgroups,
linux-kernel
Sorry, git-send-email didn't pick up the CCs, full quote here:
On Tue, Apr 24, 2012 at 09:31:00PM +0200, Johannes Weiner wrote:
> None of the callsites actually need the page_cgroup descriptor
> themselves, so just pass the page and do the look up in there.
>
> We already had two bugs (6568d4a 'mm: memcg: update the correct soft
> limit tree during migration' and 'memcg: fix Bad page state after
> replace_page_cache') where the passed page and pc were not referring
> to the same page frame.
>
> Signed-off-by: Johannes Weiner <hannes@cmpxchg.org>
> Acked-by: Hugh Dickins <hughd@google.com>
> Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
> Cc: Michal Hocko <mhocko@suse.cz>
> ---
> mm/memcontrol.c | 17 +++++------------
> 1 files changed, 5 insertions(+), 12 deletions(-)
>
> diff --git a/mm/memcontrol.c b/mm/memcontrol.c
> index 884e936..1a28dd8 100644
> --- a/mm/memcontrol.c
> +++ b/mm/memcontrol.c
> @@ -2461,10 +2461,10 @@ struct mem_cgroup *try_get_mem_cgroup_from_page(struct page *page)
> static void __mem_cgroup_commit_charge(struct mem_cgroup *memcg,
> struct page *page,
> unsigned int nr_pages,
> - struct page_cgroup *pc,
> enum charge_type ctype,
> bool lrucare)
> {
> + struct page_cgroup *pc = lookup_page_cgroup(page);
> struct zone *uninitialized_var(zone);
> bool was_on_lru = false;
> bool anon;
> @@ -2701,7 +2701,6 @@ static int mem_cgroup_charge_common(struct page *page, struct mm_struct *mm,
> {
> struct mem_cgroup *memcg = NULL;
> unsigned int nr_pages = 1;
> - struct page_cgroup *pc;
> bool oom = true;
> int ret;
>
> @@ -2715,11 +2714,10 @@ static int mem_cgroup_charge_common(struct page *page, struct mm_struct *mm,
> oom = false;
> }
>
> - pc = lookup_page_cgroup(page);
> ret = __mem_cgroup_try_charge(mm, gfp_mask, nr_pages, &memcg, oom);
> if (ret == -ENOMEM)
> return ret;
> - __mem_cgroup_commit_charge(memcg, page, nr_pages, pc, ctype, false);
> + __mem_cgroup_commit_charge(memcg, page, nr_pages, ctype, false);
> return 0;
> }
>
> @@ -2816,16 +2814,13 @@ static void
> __mem_cgroup_commit_charge_swapin(struct page *page, struct mem_cgroup *memcg,
> enum charge_type ctype)
> {
> - struct page_cgroup *pc;
> -
> if (mem_cgroup_disabled())
> return;
> if (!memcg)
> return;
> cgroup_exclude_rmdir(&memcg->css);
>
> - pc = lookup_page_cgroup(page);
> - __mem_cgroup_commit_charge(memcg, page, 1, pc, ctype, true);
> + __mem_cgroup_commit_charge(memcg, page, 1, ctype, true);
> /*
> * Now swap is on-memory. This means this page may be
> * counted both as mem and swap....double count.
> @@ -3254,14 +3249,13 @@ int mem_cgroup_prepare_migration(struct page *page,
> * page. In the case new page is migrated but not remapped, new page's
> * mapcount will be finally 0 and we call uncharge in end_migration().
> */
> - pc = lookup_page_cgroup(newpage);
> if (PageAnon(page))
> ctype = MEM_CGROUP_CHARGE_TYPE_MAPPED;
> else if (page_is_file_cache(page))
> ctype = MEM_CGROUP_CHARGE_TYPE_CACHE;
> else
> ctype = MEM_CGROUP_CHARGE_TYPE_SHMEM;
> - __mem_cgroup_commit_charge(memcg, newpage, 1, pc, ctype, false);
> + __mem_cgroup_commit_charge(memcg, newpage, 1, ctype, false);
> return ret;
> }
>
> @@ -3348,8 +3342,7 @@ void mem_cgroup_replace_page_cache(struct page *oldpage,
> * the newpage may be on LRU(or pagevec for LRU) already. We lock
> * LRU while we overwrite pc->mem_cgroup.
> */
> - pc = lookup_page_cgroup(newpage);
> - __mem_cgroup_commit_charge(memcg, newpage, 1, pc, type, true);
> + __mem_cgroup_commit_charge(memcg, newpage, 1, type, true);
> }
>
> #ifdef CONFIG_DEBUG_VM
> --
> 1.7.7.6
>
> --
> 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/
> Don't email: <a href=mailto:"dont@kvack.org"> email@kvack.org </a>
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: [patch] mm: memcg: move pc lookup point to commit_charge()
2012-04-24 19:31 [patch] mm: memcg: move pc lookup point to commit_charge() Johannes Weiner
2012-04-24 19:38 ` Johannes Weiner
@ 2012-04-25 8:21 ` Michal Hocko
2012-04-26 2:02 ` KAMEZAWA Hiroyuki
2 siblings, 0 replies; 4+ messages in thread
From: Michal Hocko @ 2012-04-25 8:21 UTC (permalink / raw)
To: Johannes Weiner; +Cc: Andrew Morton, linux-mm, cgroups, linux-kernel
On Tue 24-04-12 21:31:00, Johannes Weiner wrote:
> None of the callsites actually need the page_cgroup descriptor
> themselves, so just pass the page and do the look up in there.
>
> We already had two bugs (6568d4a 'mm: memcg: update the correct soft
> limit tree during migration' and 'memcg: fix Bad page state after
> replace_page_cache') where the passed page and pc were not referring
> to the same page frame.
Yes let's get rid of these relics once and for all.
> Signed-off-by: Johannes Weiner <hannes@cmpxchg.org>
> Acked-by: Hugh Dickins <hughd@google.com>
> Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
> Cc: Michal Hocko <mhocko@suse.cz>
Acked-by: Michal Hocko <mhocko@suse.cz>
Thanks!
> ---
> mm/memcontrol.c | 17 +++++------------
> 1 files changed, 5 insertions(+), 12 deletions(-)
>
> diff --git a/mm/memcontrol.c b/mm/memcontrol.c
> index 884e936..1a28dd8 100644
> --- a/mm/memcontrol.c
> +++ b/mm/memcontrol.c
> @@ -2461,10 +2461,10 @@ struct mem_cgroup *try_get_mem_cgroup_from_page(struct page *page)
> static void __mem_cgroup_commit_charge(struct mem_cgroup *memcg,
> struct page *page,
> unsigned int nr_pages,
> - struct page_cgroup *pc,
> enum charge_type ctype,
> bool lrucare)
> {
> + struct page_cgroup *pc = lookup_page_cgroup(page);
> struct zone *uninitialized_var(zone);
> bool was_on_lru = false;
> bool anon;
> @@ -2701,7 +2701,6 @@ static int mem_cgroup_charge_common(struct page *page, struct mm_struct *mm,
> {
> struct mem_cgroup *memcg = NULL;
> unsigned int nr_pages = 1;
> - struct page_cgroup *pc;
> bool oom = true;
> int ret;
>
> @@ -2715,11 +2714,10 @@ static int mem_cgroup_charge_common(struct page *page, struct mm_struct *mm,
> oom = false;
> }
>
> - pc = lookup_page_cgroup(page);
> ret = __mem_cgroup_try_charge(mm, gfp_mask, nr_pages, &memcg, oom);
> if (ret == -ENOMEM)
> return ret;
> - __mem_cgroup_commit_charge(memcg, page, nr_pages, pc, ctype, false);
> + __mem_cgroup_commit_charge(memcg, page, nr_pages, ctype, false);
> return 0;
> }
>
> @@ -2816,16 +2814,13 @@ static void
> __mem_cgroup_commit_charge_swapin(struct page *page, struct mem_cgroup *memcg,
> enum charge_type ctype)
> {
> - struct page_cgroup *pc;
> -
> if (mem_cgroup_disabled())
> return;
> if (!memcg)
> return;
> cgroup_exclude_rmdir(&memcg->css);
>
> - pc = lookup_page_cgroup(page);
> - __mem_cgroup_commit_charge(memcg, page, 1, pc, ctype, true);
> + __mem_cgroup_commit_charge(memcg, page, 1, ctype, true);
> /*
> * Now swap is on-memory. This means this page may be
> * counted both as mem and swap....double count.
> @@ -3254,14 +3249,13 @@ int mem_cgroup_prepare_migration(struct page *page,
> * page. In the case new page is migrated but not remapped, new page's
> * mapcount will be finally 0 and we call uncharge in end_migration().
> */
> - pc = lookup_page_cgroup(newpage);
> if (PageAnon(page))
> ctype = MEM_CGROUP_CHARGE_TYPE_MAPPED;
> else if (page_is_file_cache(page))
> ctype = MEM_CGROUP_CHARGE_TYPE_CACHE;
> else
> ctype = MEM_CGROUP_CHARGE_TYPE_SHMEM;
> - __mem_cgroup_commit_charge(memcg, newpage, 1, pc, ctype, false);
> + __mem_cgroup_commit_charge(memcg, newpage, 1, ctype, false);
> return ret;
> }
>
> @@ -3348,8 +3342,7 @@ void mem_cgroup_replace_page_cache(struct page *oldpage,
> * the newpage may be on LRU(or pagevec for LRU) already. We lock
> * LRU while we overwrite pc->mem_cgroup.
> */
> - pc = lookup_page_cgroup(newpage);
> - __mem_cgroup_commit_charge(memcg, newpage, 1, pc, type, true);
> + __mem_cgroup_commit_charge(memcg, newpage, 1, type, true);
> }
>
> #ifdef CONFIG_DEBUG_VM
> --
> 1.7.7.6
>
> --
> 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/
> Don't email: <a href=mailto:"dont@kvack.org"> email@kvack.org </a>
--
Michal Hocko
SUSE Labs
SUSE LINUX s.r.o.
Lihovarska 1060/12
190 00 Praha 9
Czech Republic
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: [patch] mm: memcg: move pc lookup point to commit_charge()
2012-04-24 19:31 [patch] mm: memcg: move pc lookup point to commit_charge() Johannes Weiner
2012-04-24 19:38 ` Johannes Weiner
2012-04-25 8:21 ` Michal Hocko
@ 2012-04-26 2:02 ` KAMEZAWA Hiroyuki
2 siblings, 0 replies; 4+ messages in thread
From: KAMEZAWA Hiroyuki @ 2012-04-26 2:02 UTC (permalink / raw)
To: Johannes Weiner; +Cc: Andrew Morton, linux-mm, cgroups, linux-kernel
(2012/04/25 4:31), Johannes Weiner wrote:
> None of the callsites actually need the page_cgroup descriptor
> themselves, so just pass the page and do the look up in there.
>
> We already had two bugs (6568d4a 'mm: memcg: update the correct soft
> limit tree during migration' and 'memcg: fix Bad page state after
> replace_page_cache') where the passed page and pc were not referring
> to the same page frame.
>
> Signed-off-by: Johannes Weiner <hannes@cmpxchg.org>
> Acked-by: Hugh Dickins <hughd@google.com>
> Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
> Cc: Michal Hocko <mhocko@suse.cz>
Acked-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
^ permalink raw reply [flat|nested] 4+ messages in thread
end of thread, other threads:[~2012-04-26 2:03 UTC | newest]
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2012-04-24 19:31 [patch] mm: memcg: move pc lookup point to commit_charge() Johannes Weiner
2012-04-24 19:38 ` Johannes Weiner
2012-04-25 8:21 ` Michal Hocko
2012-04-26 2:02 ` KAMEZAWA Hiroyuki
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