diff options
author | Tejun Heo <tj@kernel.org> | 2017-02-22 15:41:39 -0800 |
---|---|---|
committer | Linus Torvalds <torvalds@linux-foundation.org> | 2017-02-22 16:41:27 -0800 |
commit | 1663f26df3df7df3720306ca67f5ea8296d68fa1 (patch) | |
tree | 6ad80b7ccc7d093c0a14532affa376452f523afe | |
parent | 17cc4dfeda97636d67e83de8cd41940b65a93bc7 (diff) | |
download | linux-1663f26df3df7df3720306ca67f5ea8296d68fa1.tar.bz2 |
slub: make sysfs directories for memcg sub-caches optional
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.
[akpm@linux-foundation.org: kset_unregister(NULL) is legal]
Link: http://lkml.kernel.org/r/20170204145203.GB26958@mtj.duckdns.org
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: Vladimir Davydov <vdavydov.dev@gmail.com>
Cc: Michal Hocko <mhocko@kernel.org>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
-rw-r--r-- | Documentation/admin-guide/kernel-parameters.txt | 8 | ||||
-rw-r--r-- | init/Kconfig | 14 | ||||
-rw-r--r-- | mm/slub.c | 26 |
3 files changed, 46 insertions, 2 deletions
diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt index d05533e6120b..986e44387dad 100644 --- a/Documentation/admin-guide/kernel-parameters.txt +++ b/Documentation/admin-guide/kernel-parameters.txt @@ -3694,6 +3694,14 @@ 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 diff --git a/init/Kconfig b/init/Kconfig index 55bb6fbc294e..22f437ff65e5 100644 --- a/init/Kconfig +++ b/init/Kconfig @@ -1779,6 +1779,20 @@ 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 diff --git a/mm/slub.c b/mm/slub.c index af38aaad34b0..7f4bc7027ed5 100644 --- a/mm/slub.c +++ b/mm/slub.c @@ -4708,6 +4708,22 @@ 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) { @@ -5611,8 +5627,14 @@ static int sysfs_slab_add(struct kmem_cache *s) { 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. @@ -5629,7 +5651,7 @@ static int sysfs_slab_add(struct kmem_cache *s) 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; @@ -5639,7 +5661,7 @@ static int sysfs_slab_add(struct kmem_cache *s) 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; |