Revision fcf8a1e483490cd249df4e02d5425636c3f43c86 authored by Waiman Long on 12 July 2019, 03:56:38 UTC, committed by Linus Torvalds on 12 July 2019, 18:05:44 UTC
There are concerns about memory leaks from extensive use of memory cgroups as each memory cgroup creates its own set of kmem caches. There is a possiblity that the memcg kmem caches may remain even after the memory cgroups have been offlined. Therefore, it will be useful to show the status of each of memcg kmem caches. This patch introduces a new <debugfs>/memcg_slabinfo file which is somewhat similar to /proc/slabinfo in format, but lists only information about kmem caches that have child memcg kmem caches. Information available in /proc/slabinfo are not repeated in memcg_slabinfo. A portion of a sample output of the file was: # <name> <css_id[:dead]> <active_objs> <num_objs> <active_slabs> <num_slabs> rpc_inode_cache root 13 51 1 1 rpc_inode_cache 48 0 0 0 0 fat_inode_cache root 1 45 1 1 fat_inode_cache 41 2 45 1 1 xfs_inode root 770 816 24 24 xfs_inode 92 22 34 1 1 xfs_inode 88:dead 1 34 1 1 xfs_inode 89:dead 23 34 1 1 xfs_inode 85 4 34 1 1 xfs_inode 84 9 34 1 1 The css id of the memcg is also listed. If a memcg is not online, the tag ":dead" will be attached as shown above. [longman@redhat.com: memcg: add ":deact" tag for reparented kmem caches in memcg_slabinfo] Link: http://lkml.kernel.org/r/20190621173005.31514-1-longman@redhat.com [longman@redhat.com: set the flag in the common code as suggested by Roman] Link: http://lkml.kernel.org/r/20190627184324.5875-1-longman@redhat.com Link: http://lkml.kernel.org/r/20190619171621.26209-1-longman@redhat.com Signed-off-by: Waiman Long <longman@redhat.com> Suggested-by: Shakeel Butt <shakeelb@google.com> Reviewed-by: Shakeel Butt <shakeelb@google.com> Acked-by: Roman Gushchin <guro@fb.com> Acked-by: David Rientjes <rientjes@google.com> Cc: Christoph Lameter <cl@linux.com> Cc: Pekka Enberg <penberg@kernel.org> Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com> Cc: Michal Hocko <mhocko@kernel.org> Cc: Johannes Weiner <hannes@cmpxchg.org> Cc: Vladimir Davydov <vdavydov.dev@gmail.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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quotaio_v1.h
/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _LINUX_QUOTAIO_V1_H
#define _LINUX_QUOTAIO_V1_H
#include <linux/types.h>
/*
* The following constants define the amount of time given a user
* before the soft limits are treated as hard limits (usually resulting
* in an allocation failure). The timer is started when the user crosses
* their soft limit, it is reset when they go below their soft limit.
*/
#define MAX_IQ_TIME 604800 /* (7*24*60*60) 1 week */
#define MAX_DQ_TIME 604800 /* (7*24*60*60) 1 week */
/*
* The following structure defines the format of the disk quota file
* (as it appears on disk) - the file is an array of these structures
* indexed by user or group number.
*/
struct v1_disk_dqblk {
__u32 dqb_bhardlimit; /* absolute limit on disk blks alloc */
__u32 dqb_bsoftlimit; /* preferred limit on disk blks */
__u32 dqb_curblocks; /* current block count */
__u32 dqb_ihardlimit; /* absolute limit on allocated inodes */
__u32 dqb_isoftlimit; /* preferred inode limit */
__u32 dqb_curinodes; /* current # allocated inodes */
time_t dqb_btime; /* time limit for excessive disk use */
time_t dqb_itime; /* time limit for excessive inode use */
};
#define v1_dqoff(UID) ((loff_t)((UID) * sizeof (struct v1_disk_dqblk)))
#endif /* _LINUX_QUOTAIO_V1_H */
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