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* [PATCH] slub: make sysfs directories for memcg sub-caches optional
@ 2017-02-04 14:52 ` Tejun Heo
  0 siblings, 0 replies; 6+ messages in thread
From: Tejun Heo @ 2017-02-04 14:52 UTC (permalink / raw)
  To: Andrew Morton, Christoph Lameter, Pekka Enberg, David Rientjes,
	Joonsoo Kim, Vladimir Davydov
  Cc: linux-kernel, linux-mm, cgroups, Michal Hocko, kernel-team

SLUB creates a per-cache directory under /sys/kernel/slab which hosts
a bunch of debug files.  Usually, there aren't that many caches on a
system and this doesn't really matter; however, if memcg is in use,
each cache can have per-cgroup sub-caches.  SLUB creates the same
directories for these sub-caches under /sys/kernel/slab/$CACHE/cgroup.

Unfortunately, because there can be a lot of cgroups, active or
draining, the product of the numbers of caches, cgroups and files in
each directory can reach a very high number - hundreds of thousands is
commonplace.  Millions and beyond aren't difficult to reach either.

What's under /sys/kernel/slab is primarily for debugging and the
information and control on the a root cache already cover its
sub-caches.  While having a separate directory for each sub-cache can
be helpful for development, it doesn't make much sense to pay this
amount of overhead by default.

This patch introduces a boot parameter slub_memcg_sysfs which
determines whether to create sysfs directories for per-memcg
sub-caches.  It also adds CONFIG_SLUB_MEMCG_SYSFS_ON which determines
the boot parameter's default value and defaults to 0.

Signed-off-by: Tejun Heo <tj@kernel.org>
Cc: Christoph Lameter <cl@linux.com>
Cc: Pekka Enberg <penberg@kernel.org>
Cc: David Rientjes <rientjes@google.com>
Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Vladimir Davydov <vdavydov.dev@gmail.com>
---
 Documentation/kernel-parameters.txt |    8 ++++++++
 init/Kconfig                        |   14 ++++++++++++++
 mm/slub.c                           |   29 ++++++++++++++++++++++++++---
 3 files changed, 48 insertions(+), 3 deletions(-)

--- a/Documentation/kernel-parameters.txt
+++ b/Documentation/kernel-parameters.txt
@@ -3517,6 +3517,14 @@ bytes respectively. Such letter suffixes
 			last alloc / free. For more information see
 			Documentation/vm/slub.txt.
 
+	slub_memcg_sysfs=	[MM, SLUB]
+			Determines whether to enable sysfs directories for
+			memory cgroup sub-caches. 1 to enable, 0 to disable.
+			The default is determined by CONFIG_SLUB_MEMCG_SYSFS_ON.
+			Enabling this can lead to a very high number of	debug
+			directories and files being created under
+			/sys/kernel/slub.
+
 	slub_max_order= [MM, SLUB]
 			Determines the maximum allowed order for slabs.
 			A high setting may cause OOMs due to memory
--- a/init/Kconfig
+++ b/init/Kconfig
@@ -1786,6 +1786,20 @@ config SLUB_DEBUG
 	  SLUB sysfs support. /sys/slab will not exist and there will be
 	  no support for cache validation etc.
 
+config SLUB_MEMCG_SYSFS_ON
+	default n
+	bool "Enable memcg SLUB sysfs support by default" if EXPERT
+	depends on SLUB && SYSFS && MEMCG
+	help
+	  SLUB creates a directory under /sys/kernel/slab for each
+	  allocation cache to host info and debug files. If memory
+	  cgroup is enabled, each cache can have per memory cgroup
+	  caches. SLUB can create the same sysfs directories for these
+	  caches under /sys/kernel/slab/CACHE/cgroup but it can lead
+	  to a very high number of debug files being created. This is
+	  controlled by slub_memcg_sysfs boot parameter and this
+	  config option determines the parameter's default value.
+
 config COMPAT_BRK
 	bool "Disable heap randomization"
 	default y
--- a/mm/slub.c
+++ b/mm/slub.c
@@ -4700,6 +4700,22 @@ enum slab_stat_type {
 #define SO_OBJECTS	(1 << SL_OBJECTS)
 #define SO_TOTAL	(1 << SL_TOTAL)
 
+#ifdef CONFIG_MEMCG
+static bool memcg_sysfs_enabled = IS_ENABLED(CONFIG_SLUB_MEMCG_SYSFS_ON);
+
+static int __init setup_slub_memcg_sysfs(char *str)
+{
+	int v;
+
+	if (get_option(&str, &v) > 0)
+		memcg_sysfs_enabled = v;
+
+	return 1;
+}
+
+__setup("slub_memcg_sysfs=", setup_slub_memcg_sysfs);
+#endif
+
 static ssize_t show_slab_objects(struct kmem_cache *s,
 			    char *buf, unsigned long flags)
 {
@@ -5603,8 +5619,14 @@ static int sysfs_slab_add(struct kmem_ca
 {
 	int err;
 	const char *name;
+	struct kset *kset = cache_kset(s);
 	int unmergeable = slab_unmergeable(s);
 
+	if (!kset) {
+		kobject_init(&s->kobj, &slab_ktype);
+		return 0;
+	}
+
 	if (unmergeable) {
 		/*
 		 * Slabcache can never be merged so we can use the name proper.
@@ -5621,7 +5643,7 @@ static int sysfs_slab_add(struct kmem_ca
 		name = create_unique_id(s);
 	}
 
-	s->kobj.kset = cache_kset(s);
+	s->kobj.kset = kset;
 	err = kobject_init_and_add(&s->kobj, &slab_ktype, NULL, "%s", name);
 	if (err)
 		goto out;
@@ -5631,7 +5653,7 @@ static int sysfs_slab_add(struct kmem_ca
 		goto out_del_kobj;
 
 #ifdef CONFIG_MEMCG
-	if (is_root_cache(s)) {
+	if (is_root_cache(s) && memcg_sysfs_enabled) {
 		s->memcg_kset = kset_create_and_add("cgroup", NULL, &s->kobj);
 		if (!s->memcg_kset) {
 			err = -ENOMEM;
@@ -5673,7 +5695,8 @@ static void sysfs_slab_remove(struct kme
 		return;
 
 #ifdef CONFIG_MEMCG
-	kset_unregister(s->memcg_kset);
+	if (s->memcg_kset)
+		kset_unregister(s->memcg_kset);
 #endif
 	kobject_uevent(&s->kobj, KOBJ_REMOVE);
 	kobject_del(&s->kobj);

^ permalink raw reply	[flat|nested] 6+ messages in thread

* [PATCH] slub: make sysfs directories for memcg sub-caches optional
@ 2017-02-04 14:52 ` Tejun Heo
  0 siblings, 0 replies; 6+ messages in thread
From: Tejun Heo @ 2017-02-04 14:52 UTC (permalink / raw)
  To: Andrew Morton, Christoph Lameter, Pekka Enberg, David Rientjes,
	Joonsoo Kim, Vladimir Davydov
  Cc: linux-kernel, linux-mm, cgroups, Michal Hocko, kernel-team

SLUB creates a per-cache directory under /sys/kernel/slab which hosts
a bunch of debug files.  Usually, there aren't that many caches on a
system and this doesn't really matter; however, if memcg is in use,
each cache can have per-cgroup sub-caches.  SLUB creates the same
directories for these sub-caches under /sys/kernel/slab/$CACHE/cgroup.

Unfortunately, because there can be a lot of cgroups, active or
draining, the product of the numbers of caches, cgroups and files in
each directory can reach a very high number - hundreds of thousands is
commonplace.  Millions and beyond aren't difficult to reach either.

What's under /sys/kernel/slab is primarily for debugging and the
information and control on the a root cache already cover its
sub-caches.  While having a separate directory for each sub-cache can
be helpful for development, it doesn't make much sense to pay this
amount of overhead by default.

This patch introduces a boot parameter slub_memcg_sysfs which
determines whether to create sysfs directories for per-memcg
sub-caches.  It also adds CONFIG_SLUB_MEMCG_SYSFS_ON which determines
the boot parameter's default value and defaults to 0.

Signed-off-by: Tejun Heo <tj@kernel.org>
Cc: Christoph Lameter <cl@linux.com>
Cc: Pekka Enberg <penberg@kernel.org>
Cc: David Rientjes <rientjes@google.com>
Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Vladimir Davydov <vdavydov.dev@gmail.com>
---
 Documentation/kernel-parameters.txt |    8 ++++++++
 init/Kconfig                        |   14 ++++++++++++++
 mm/slub.c                           |   29 ++++++++++++++++++++++++++---
 3 files changed, 48 insertions(+), 3 deletions(-)

--- a/Documentation/kernel-parameters.txt
+++ b/Documentation/kernel-parameters.txt
@@ -3517,6 +3517,14 @@ bytes respectively. Such letter suffixes
 			last alloc / free. For more information see
 			Documentation/vm/slub.txt.
 
+	slub_memcg_sysfs=	[MM, SLUB]
+			Determines whether to enable sysfs directories for
+			memory cgroup sub-caches. 1 to enable, 0 to disable.
+			The default is determined by CONFIG_SLUB_MEMCG_SYSFS_ON.
+			Enabling this can lead to a very high number of	debug
+			directories and files being created under
+			/sys/kernel/slub.
+
 	slub_max_order= [MM, SLUB]
 			Determines the maximum allowed order for slabs.
 			A high setting may cause OOMs due to memory
--- a/init/Kconfig
+++ b/init/Kconfig
@@ -1786,6 +1786,20 @@ config SLUB_DEBUG
 	  SLUB sysfs support. /sys/slab will not exist and there will be
 	  no support for cache validation etc.
 
+config SLUB_MEMCG_SYSFS_ON
+	default n
+	bool "Enable memcg SLUB sysfs support by default" if EXPERT
+	depends on SLUB && SYSFS && MEMCG
+	help
+	  SLUB creates a directory under /sys/kernel/slab for each
+	  allocation cache to host info and debug files. If memory
+	  cgroup is enabled, each cache can have per memory cgroup
+	  caches. SLUB can create the same sysfs directories for these
+	  caches under /sys/kernel/slab/CACHE/cgroup but it can lead
+	  to a very high number of debug files being created. This is
+	  controlled by slub_memcg_sysfs boot parameter and this
+	  config option determines the parameter's default value.
+
 config COMPAT_BRK
 	bool "Disable heap randomization"
 	default y
--- a/mm/slub.c
+++ b/mm/slub.c
@@ -4700,6 +4700,22 @@ enum slab_stat_type {
 #define SO_OBJECTS	(1 << SL_OBJECTS)
 #define SO_TOTAL	(1 << SL_TOTAL)
 
+#ifdef CONFIG_MEMCG
+static bool memcg_sysfs_enabled = IS_ENABLED(CONFIG_SLUB_MEMCG_SYSFS_ON);
+
+static int __init setup_slub_memcg_sysfs(char *str)
+{
+	int v;
+
+	if (get_option(&str, &v) > 0)
+		memcg_sysfs_enabled = v;
+
+	return 1;
+}
+
+__setup("slub_memcg_sysfs=", setup_slub_memcg_sysfs);
+#endif
+
 static ssize_t show_slab_objects(struct kmem_cache *s,
 			    char *buf, unsigned long flags)
 {
@@ -5603,8 +5619,14 @@ static int sysfs_slab_add(struct kmem_ca
 {
 	int err;
 	const char *name;
+	struct kset *kset = cache_kset(s);
 	int unmergeable = slab_unmergeable(s);
 
+	if (!kset) {
+		kobject_init(&s->kobj, &slab_ktype);
+		return 0;
+	}
+
 	if (unmergeable) {
 		/*
 		 * Slabcache can never be merged so we can use the name proper.
@@ -5621,7 +5643,7 @@ static int sysfs_slab_add(struct kmem_ca
 		name = create_unique_id(s);
 	}
 
-	s->kobj.kset = cache_kset(s);
+	s->kobj.kset = kset;
 	err = kobject_init_and_add(&s->kobj, &slab_ktype, NULL, "%s", name);
 	if (err)
 		goto out;
@@ -5631,7 +5653,7 @@ static int sysfs_slab_add(struct kmem_ca
 		goto out_del_kobj;
 
 #ifdef CONFIG_MEMCG
-	if (is_root_cache(s)) {
+	if (is_root_cache(s) && memcg_sysfs_enabled) {
 		s->memcg_kset = kset_create_and_add("cgroup", NULL, &s->kobj);
 		if (!s->memcg_kset) {
 			err = -ENOMEM;
@@ -5673,7 +5695,8 @@ static void sysfs_slab_remove(struct kme
 		return;
 
 #ifdef CONFIG_MEMCG
-	kset_unregister(s->memcg_kset);
+	if (s->memcg_kset)
+		kset_unregister(s->memcg_kset);
 #endif
 	kobject_uevent(&s->kobj, KOBJ_REMOVE);
 	kobject_del(&s->kobj);

--
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^ permalink raw reply	[flat|nested] 6+ messages in thread

* Re: [PATCH] slub: make sysfs directories for memcg sub-caches optional
  2017-02-04 14:52 ` Tejun Heo
@ 2017-02-07  0:22   ` Andrew Morton
  -1 siblings, 0 replies; 6+ messages in thread
From: Andrew Morton @ 2017-02-07  0:22 UTC (permalink / raw)
  To: Tejun Heo
  Cc: Christoph Lameter, Pekka Enberg, David Rientjes, Joonsoo Kim,
	Vladimir Davydov, linux-kernel, linux-mm, cgroups, Michal Hocko,
	kernel-team

On Sat, 4 Feb 2017 09:52:03 -0500 Tejun Heo <tj@kernel.org> wrote:

> SLUB creates a per-cache directory under /sys/kernel/slab which hosts
> a bunch of debug files.  Usually, there aren't that many caches on a
> system and this doesn't really matter; however, if memcg is in use,
> each cache can have per-cgroup sub-caches.  SLUB creates the same
> directories for these sub-caches under /sys/kernel/slab/$CACHE/cgroup.
> 
> Unfortunately, because there can be a lot of cgroups, active or
> draining, the product of the numbers of caches, cgroups and files in
> each directory can reach a very high number - hundreds of thousands is
> commonplace.  Millions and beyond aren't difficult to reach either.
> 
> What's under /sys/kernel/slab is primarily for debugging and the
> information and control on the a root cache already cover its
> sub-caches.  While having a separate directory for each sub-cache can
> be helpful for development, it doesn't make much sense to pay this
> amount of overhead by default.
> 
> This patch introduces a boot parameter slub_memcg_sysfs which
> determines whether to create sysfs directories for per-memcg
> sub-caches.  It also adds CONFIG_SLUB_MEMCG_SYSFS_ON which determines
> the boot parameter's default value and defaults to 0.
> 
> ...
>
>  #ifdef CONFIG_MEMCG
> -	if (is_root_cache(s)) {
> +	if (is_root_cache(s) && memcg_sysfs_enabled) {

This could be turned on and off after bootup but I guess the result
could be pretty confusing.

However there would be useful use cases?  The user would normally have
this disabled but if he wants to do a bit of debugging then turn this
on, create a memcg, have a poke around then turn the feature off again.

>  		s->memcg_kset = kset_create_and_add("cgroup", NULL, &s->kobj);
>  		if (!s->memcg_kset) {
>  			err = -ENOMEM;
> @@ -5673,7 +5695,8 @@ static void sysfs_slab_remove(struct kme
>  		return;
>  
>  #ifdef CONFIG_MEMCG
> -	kset_unregister(s->memcg_kset);
> +	if (s->memcg_kset)
> +		kset_unregister(s->memcg_kset);

kset_unregister(NULL) is legal

--- a/mm/slub.c~slub-make-sysfs-directories-for-memcg-sub-caches-optional-fix
+++ a/mm/slub.c
@@ -5699,8 +5699,7 @@ static void sysfs_slab_remove(struct kme
 		return;
 
 #ifdef CONFIG_MEMCG
-	if (s->memcg_kset)
-		kset_unregister(s->memcg_kset);
+	kset_unregister(s->memcg_kset);
 #endif
 	kobject_uevent(&s->kobj, KOBJ_REMOVE);
 	kobject_del(&s->kobj);
_

^ permalink raw reply	[flat|nested] 6+ messages in thread

* Re: [PATCH] slub: make sysfs directories for memcg sub-caches optional
@ 2017-02-07  0:22   ` Andrew Morton
  0 siblings, 0 replies; 6+ messages in thread
From: Andrew Morton @ 2017-02-07  0:22 UTC (permalink / raw)
  To: Tejun Heo
  Cc: Christoph Lameter, Pekka Enberg, David Rientjes, Joonsoo Kim,
	Vladimir Davydov, linux-kernel, linux-mm, cgroups, Michal Hocko,
	kernel-team

On Sat, 4 Feb 2017 09:52:03 -0500 Tejun Heo <tj@kernel.org> wrote:

> SLUB creates a per-cache directory under /sys/kernel/slab which hosts
> a bunch of debug files.  Usually, there aren't that many caches on a
> system and this doesn't really matter; however, if memcg is in use,
> each cache can have per-cgroup sub-caches.  SLUB creates the same
> directories for these sub-caches under /sys/kernel/slab/$CACHE/cgroup.
> 
> Unfortunately, because there can be a lot of cgroups, active or
> draining, the product of the numbers of caches, cgroups and files in
> each directory can reach a very high number - hundreds of thousands is
> commonplace.  Millions and beyond aren't difficult to reach either.
> 
> What's under /sys/kernel/slab is primarily for debugging and the
> information and control on the a root cache already cover its
> sub-caches.  While having a separate directory for each sub-cache can
> be helpful for development, it doesn't make much sense to pay this
> amount of overhead by default.
> 
> This patch introduces a boot parameter slub_memcg_sysfs which
> determines whether to create sysfs directories for per-memcg
> sub-caches.  It also adds CONFIG_SLUB_MEMCG_SYSFS_ON which determines
> the boot parameter's default value and defaults to 0.
> 
> ...
>
>  #ifdef CONFIG_MEMCG
> -	if (is_root_cache(s)) {
> +	if (is_root_cache(s) && memcg_sysfs_enabled) {

This could be turned on and off after bootup but I guess the result
could be pretty confusing.

However there would be useful use cases?  The user would normally have
this disabled but if he wants to do a bit of debugging then turn this
on, create a memcg, have a poke around then turn the feature off again.

>  		s->memcg_kset = kset_create_and_add("cgroup", NULL, &s->kobj);
>  		if (!s->memcg_kset) {
>  			err = -ENOMEM;
> @@ -5673,7 +5695,8 @@ static void sysfs_slab_remove(struct kme
>  		return;
>  
>  #ifdef CONFIG_MEMCG
> -	kset_unregister(s->memcg_kset);
> +	if (s->memcg_kset)
> +		kset_unregister(s->memcg_kset);

kset_unregister(NULL) is legal

--- a/mm/slub.c~slub-make-sysfs-directories-for-memcg-sub-caches-optional-fix
+++ a/mm/slub.c
@@ -5699,8 +5699,7 @@ static void sysfs_slab_remove(struct kme
 		return;
 
 #ifdef CONFIG_MEMCG
-	if (s->memcg_kset)
-		kset_unregister(s->memcg_kset);
+	kset_unregister(s->memcg_kset);
 #endif
 	kobject_uevent(&s->kobj, KOBJ_REMOVE);
 	kobject_del(&s->kobj);
_

--
To unsubscribe, send a message with 'unsubscribe linux-mm' in
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^ permalink raw reply	[flat|nested] 6+ messages in thread

* Re: [PATCH] slub: make sysfs directories for memcg sub-caches optional
  2017-02-07  0:22   ` Andrew Morton
@ 2017-02-07 17:10     ` Tejun Heo
  -1 siblings, 0 replies; 6+ messages in thread
From: Tejun Heo @ 2017-02-07 17:10 UTC (permalink / raw)
  To: Andrew Morton
  Cc: Christoph Lameter, Pekka Enberg, David Rientjes, Joonsoo Kim,
	Vladimir Davydov, linux-kernel, linux-mm, cgroups, Michal Hocko,
	kernel-team

Hello, Andrew.

On Mon, Feb 06, 2017 at 04:22:13PM -0800, Andrew Morton wrote:
> >  #ifdef CONFIG_MEMCG
> > -	if (is_root_cache(s)) {
> > +	if (is_root_cache(s) && memcg_sysfs_enabled) {
> 
> This could be turned on and off after bootup but I guess the result
> could be pretty confusing.
> 
> However there would be useful use cases?  The user would normally have
> this disabled but if he wants to do a bit of debugging then turn this
> on, create a memcg, have a poke around then turn the feature off again.

Hmm... maybe.  It's somewhat nasty to do after-the-fact.  You would
have to re-walk all the caches to create and destroy the sysfs
entries.  Given that it's a pretty fringe debug feature, I'm not sure
the added complexity would be justified.

> >  		s->memcg_kset = kset_create_and_add("cgroup", NULL, &s->kobj);
> >  		if (!s->memcg_kset) {
> >  			err = -ENOMEM;
> > @@ -5673,7 +5695,8 @@ static void sysfs_slab_remove(struct kme
> >  		return;
> >  
> >  #ifdef CONFIG_MEMCG
> > -	kset_unregister(s->memcg_kset);
> > +	if (s->memcg_kset)
> > +		kset_unregister(s->memcg_kset);
> 
> kset_unregister(NULL) is legal
> 
> --- a/mm/slub.c~slub-make-sysfs-directories-for-memcg-sub-caches-optional-fix
> +++ a/mm/slub.c
> @@ -5699,8 +5699,7 @@ static void sysfs_slab_remove(struct kme
>  		return;
>  
>  #ifdef CONFIG_MEMCG
> -	if (s->memcg_kset)
> -		kset_unregister(s->memcg_kset);
> +	kset_unregister(s->memcg_kset);
>  #endif
>  	kobject_uevent(&s->kobj, KOBJ_REMOVE);
>  	kobject_del(&s->kobj);

Ah, of course, looks good to me.

Thanks.

-- 
tejun

^ permalink raw reply	[flat|nested] 6+ messages in thread

* Re: [PATCH] slub: make sysfs directories for memcg sub-caches optional
@ 2017-02-07 17:10     ` Tejun Heo
  0 siblings, 0 replies; 6+ messages in thread
From: Tejun Heo @ 2017-02-07 17:10 UTC (permalink / raw)
  To: Andrew Morton
  Cc: Christoph Lameter, Pekka Enberg, David Rientjes, Joonsoo Kim,
	Vladimir Davydov, linux-kernel, linux-mm, cgroups, Michal Hocko,
	kernel-team

Hello, Andrew.

On Mon, Feb 06, 2017 at 04:22:13PM -0800, Andrew Morton wrote:
> >  #ifdef CONFIG_MEMCG
> > -	if (is_root_cache(s)) {
> > +	if (is_root_cache(s) && memcg_sysfs_enabled) {
> 
> This could be turned on and off after bootup but I guess the result
> could be pretty confusing.
> 
> However there would be useful use cases?  The user would normally have
> this disabled but if he wants to do a bit of debugging then turn this
> on, create a memcg, have a poke around then turn the feature off again.

Hmm... maybe.  It's somewhat nasty to do after-the-fact.  You would
have to re-walk all the caches to create and destroy the sysfs
entries.  Given that it's a pretty fringe debug feature, I'm not sure
the added complexity would be justified.

> >  		s->memcg_kset = kset_create_and_add("cgroup", NULL, &s->kobj);
> >  		if (!s->memcg_kset) {
> >  			err = -ENOMEM;
> > @@ -5673,7 +5695,8 @@ static void sysfs_slab_remove(struct kme
> >  		return;
> >  
> >  #ifdef CONFIG_MEMCG
> > -	kset_unregister(s->memcg_kset);
> > +	if (s->memcg_kset)
> > +		kset_unregister(s->memcg_kset);
> 
> kset_unregister(NULL) is legal
> 
> --- a/mm/slub.c~slub-make-sysfs-directories-for-memcg-sub-caches-optional-fix
> +++ a/mm/slub.c
> @@ -5699,8 +5699,7 @@ static void sysfs_slab_remove(struct kme
>  		return;
>  
>  #ifdef CONFIG_MEMCG
> -	if (s->memcg_kset)
> -		kset_unregister(s->memcg_kset);
> +	kset_unregister(s->memcg_kset);
>  #endif
>  	kobject_uevent(&s->kobj, KOBJ_REMOVE);
>  	kobject_del(&s->kobj);

Ah, of course, looks good to me.

Thanks.

-- 
tejun

--
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/ .
Don't email: <a href=mailto:"dont@kvack.org"> email@kvack.org </a>

^ permalink raw reply	[flat|nested] 6+ messages in thread

end of thread, other threads:[~2017-02-07 17:10 UTC | newest]

Thread overview: 6+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2017-02-04 14:52 [PATCH] slub: make sysfs directories for memcg sub-caches optional Tejun Heo
2017-02-04 14:52 ` Tejun Heo
2017-02-07  0:22 ` Andrew Morton
2017-02-07  0:22   ` Andrew Morton
2017-02-07 17:10   ` Tejun Heo
2017-02-07 17:10     ` Tejun Heo

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