Revision 4d96ba3530750fae3f3f01150adfecde96157815 authored by Roman Gushchin on 12 July 2019, 03:56:31 UTC, committed by Linus Torvalds on 12 July 2019, 18:05:44 UTC
Every slab page charged to a non-root memory cgroup has a pointer to the memory cgroup and holds a reference to it, which protects a non-empty memory cgroup from being released. At the same time the page has a pointer to the corresponding kmem_cache, and also hold a reference to the kmem_cache. And kmem_cache by itself holds a reference to the cgroup. So there is clearly some redundancy, which allows to stop setting the page->mem_cgroup pointer and rely on getting memcg pointer indirectly via kmem_cache. Further it will allow to change this pointer easier, without a need to go over all charged pages. So let's stop setting page->mem_cgroup pointer for slab pages, and stop using the css refcounter directly for protecting the memory cgroup from going away. Instead rely on kmem_cache as an intermediate object. Make sure that vmstats and shrinker lists are working as previously, as well as /proc/kpagecgroup interface. Link: http://lkml.kernel.org/r/20190611231813.3148843-10-guro@fb.com Signed-off-by: Roman Gushchin <guro@fb.com> Acked-by: Vladimir Davydov <vdavydov.dev@gmail.com> Reviewed-by: Shakeel Butt <shakeelb@google.com> Cc: Christoph Lameter <cl@linux.com> Cc: Johannes Weiner <hannes@cmpxchg.org> Cc: Michal Hocko <mhocko@suse.com> Cc: Waiman Long <longman@redhat.com> Cc: David Rientjes <rientjes@google.com> Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com> Cc: Pekka Enberg <penberg@kernel.org> Cc: Andrei Vagin <avagin@gmail.com> Cc: Qian Cai <cai@lca.pw> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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File | Mode | Size |
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partitions | ||
Kconfig | -rw-r--r-- | 5.8 KB |
Kconfig.iosched | -rw-r--r-- | 1.3 KB |
Makefile | -rw-r--r-- | 1.5 KB |
badblocks.c | -rw-r--r-- | 14.1 KB |
bfq-cgroup.c | -rw-r--r-- | 35.1 KB |
bfq-iosched.c | -rw-r--r-- | 232.5 KB |
bfq-iosched.h | -rw-r--r-- | 36.1 KB |
bfq-wf2q.c | -rw-r--r-- | 52.3 KB |
bio-integrity.c | -rw-r--r-- | 12.2 KB |
bio.c | -rw-r--r-- | 53.5 KB |
blk-cgroup.c | -rw-r--r-- | 44.9 KB |
blk-core.c | -rw-r--r-- | 47.5 KB |
blk-exec.c | -rw-r--r-- | 2.6 KB |
blk-flush.c | -rw-r--r-- | 14.3 KB |
blk-integrity.c | -rw-r--r-- | 11.4 KB |
blk-ioc.c | -rw-r--r-- | 10.2 KB |
blk-iolatency.c | -rw-r--r-- | 27.9 KB |
blk-lib.c | -rw-r--r-- | 10.2 KB |
blk-map.c | -rw-r--r-- | 6.0 KB |
blk-merge.c | -rw-r--r-- | 20.6 KB |
blk-mq-cpumap.c | -rw-r--r-- | 1.9 KB |
blk-mq-debugfs-zoned.c | -rw-r--r-- | 435 bytes |
blk-mq-debugfs.c | -rw-r--r-- | 24.4 KB |
blk-mq-debugfs.h | -rw-r--r-- | 2.7 KB |
blk-mq-pci.c | -rw-r--r-- | 1.3 KB |
blk-mq-rdma.c | -rw-r--r-- | 1.3 KB |
blk-mq-sched.c | -rw-r--r-- | 14.1 KB |
blk-mq-sched.h | -rw-r--r-- | 2.7 KB |
blk-mq-sysfs.c | -rw-r--r-- | 8.6 KB |
blk-mq-tag.c | -rw-r--r-- | 14.4 KB |
blk-mq-tag.h | -rw-r--r-- | 2.3 KB |
blk-mq-virtio.c | -rw-r--r-- | 1.3 KB |
blk-mq.c | -rw-r--r-- | 85.7 KB |
blk-mq.h | -rw-r--r-- | 6.5 KB |
blk-pm.c | -rw-r--r-- | 6.6 KB |
blk-pm.h | -rw-r--r-- | 1.4 KB |
blk-rq-qos.c | -rw-r--r-- | 6.4 KB |
blk-rq-qos.h | -rw-r--r-- | 4.4 KB |
blk-settings.c | -rw-r--r-- | 26.8 KB |
blk-softirq.c | -rw-r--r-- | 3.7 KB |
blk-stat.c | -rw-r--r-- | 4.6 KB |
blk-stat.h | -rw-r--r-- | 4.6 KB |
blk-sysfs.c | -rw-r--r-- | 26.2 KB |
blk-throttle.c | -rw-r--r-- | 67.9 KB |
blk-timeout.c | -rw-r--r-- | 3.8 KB |
blk-wbt.c | -rw-r--r-- | 20.0 KB |
blk-wbt.h | -rw-r--r-- | 3.0 KB |
blk-zoned.c | -rw-r--r-- | 11.7 KB |
blk.h | -rw-r--r-- | 10.5 KB |
bounce.c | -rw-r--r-- | 9.3 KB |
bsg-lib.c | -rw-r--r-- | 9.8 KB |
bsg.c | -rw-r--r-- | 11.1 KB |
cmdline-parser.c | -rw-r--r-- | 4.9 KB |
compat_ioctl.c | -rw-r--r-- | 10.9 KB |
elevator.c | -rw-r--r-- | 16.4 KB |
genhd.c | -rw-r--r-- | 50.2 KB |
ioctl.c | -rw-r--r-- | 15.4 KB |
ioprio.c | -rw-r--r-- | 5.1 KB |
kyber-iosched.c | -rw-r--r-- | 27.8 KB |
mq-deadline.c | -rw-r--r-- | 20.6 KB |
opal_proto.h | -rw-r--r-- | 9.3 KB |
partition-generic.c | -rw-r--r-- | 17.4 KB |
scsi_ioctl.c | -rw-r--r-- | 18.5 KB |
sed-opal.c | -rw-r--r-- | 58.3 KB |
t10-pi.c | -rw-r--r-- | 7.2 KB |
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