Shakeel Butt 1e577f970f mm, memcg: introduce memory.events.local ... The memory controller in cgroup v2 exposes memory.events file for each memcg which shows the number of times events like low, high, max, oom and oom_kill have happened for the whole tree rooted at that memcg. Users can also poll or register notification to monitor the changes in that file. Any event at any level of the tree rooted at memcg will notify all the listeners along the path till root_mem_cgroup. There are existing users which depend on this behavior. However there are users which are only interested in the events happening at a specific level of the memcg tree and not in the events in the underlying tree rooted at that memcg. One such use-case is a centralized resource monitor which can dynamically adjust the limits of the jobs running on a system. The jobs can create their sub-hierarchy for their own sub-tasks. The centralized monitor is only interested in the events at the top level memcgs of the jobs as it can then act and adjust the limits of the jobs. Using the current memory.events for such centralized monitor is very inconvenient. The monitor will keep receiving events which it is not interested and to find if the received event is interesting, it has to read memory.event files of the next level and compare it with the top level one. So, let's introduce memory.events.local to the memcg which shows and notify for the events at the memcg level. Now, does memory.stat and memory.pressure need their local versions. IMHO no due to the no internal process contraint of the cgroup v2. The memory.stat file of the top level memcg of a job shows the stats and vmevents of the whole tree. The local stats or vmevents of the top level memcg will only change if there is a process running in that memcg but v2 does not allow that. Similarly for memory.pressure there will not be any process in the internal nodes and thus no chance of local pressure. Link: http://lkml.kernel.org/r/20190527174643.209172-1-shakeelb@google.com Signed-off-by: Shakeel Butt <shakeelb@google.com> Reviewed-by: Roman Gushchin <guro@fb.com> Acked-by: Johannes Weiner <hannes@cmpxchg.org> Acked-by: Michal Hocko <mhocko@suse.com> Cc: Vladimir Davydov <vdavydov.dev@gmail.com> Cc: Chris Down <chris@chrisdown.name> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>		2019-07-12 11:05:43 -07:00
..
kasan	mm/kasan: change kasan_check_{read,write} to return boolean	2019-07-12 11:05:42 -07:00
backing-dev.c
balloon_compaction.c
cleancache.c
cma_debug.c
cma.c
cma.h
compaction.c
debug_page_ref.c
debug.c
dmapool.c
early_ioremap.c
fadvise.c
failslab.c	mm/failslab.c: by default, do not fail allocations with direct reclaim only	2019-07-12 11:05:43 -07:00
filemap.c	mm/filemap.c: correct the comment about VM_FAULT_RETRY	2019-07-12 11:05:43 -07:00
frame_vector.c
frontswap.c
gup_benchmark.c
gup.c	mm/gup.c: make follow_page_mask() static	2019-07-12 11:05:42 -07:00
highmem.c
hmm.c
huge_memory.c
hugetlb_cgroup.c
hugetlb.c
hwpoison-inject.c
init-mm.c
internal.h
interval_tree.c
Kconfig
Kconfig.debug	mm, debug_pagealloc: use a page type instead of page_ext flag	2019-07-12 11:05:43 -07:00
khugepaged.c
kmemleak-test.c
kmemleak.c	mm/kmemleak.c: change error at _write when kmemleak is disabled	2019-07-12 11:05:42 -07:00
ksm.c
list_lru.c
maccess.c
madvise.c
Makefile
memblock.c
memcontrol.c	mm, memcg: introduce memory.events.local	2019-07-12 11:05:43 -07:00
memfd.c
memory_hotplug.c
memory-failure.c
memory.c	mm, swap: fix race between swapoff and some swap operations	2019-07-12 11:05:43 -07:00
mempolicy.c
mempool.c
memtest.c
migrate.c
mincore.c	mm/mincore.c: fix race between swapoff and mincore	2019-07-12 11:05:43 -07:00
mlock.c
mm_init.c
mmap.c
mmu_context.c
mmu_gather.c
mmu_notifier.c
mmzone.c
mprotect.c
mremap.c
msync.c
nommu.c
oom_kill.c
page_alloc.c	mm, debug_pagealloc: use a page type instead of page_ext flag	2019-07-12 11:05:43 -07:00
page_counter.c
page_ext.c	mm, debug_pagealloc: use a page type instead of page_ext flag	2019-07-12 11:05:43 -07:00
page_idle.c
page_io.c	mm, swap: use rbtree for swap_extent	2019-07-12 11:05:43 -07:00
page_isolation.c	mm/page_isolation.c: change the prototype of undo_isolate_page_range()	2019-07-12 11:05:43 -07:00
page_owner.c
page_poison.c
page_vma_mapped.c
page-writeback.c	mm: remove the account_page_dirtied export	2019-07-12 11:05:42 -07:00
pagewalk.c
percpu-internal.h
percpu-km.c
percpu-stats.c
percpu-vm.c
percpu.c
pgtable-generic.c
process_vm_access.c
quicklist.c
readahead.c
rmap.c
rodata_test.c
shmem.c
shuffle.c
shuffle.h
slab_common.c	mm/kasan: add object validation in ksize()	2019-07-12 11:05:42 -07:00
slab.c	mm/slab: refactor common ksize KASAN logic into slab_common.c	2019-07-12 11:05:42 -07:00
slab.h	mm/slab: sanity-check page type when looking up cache	2019-07-12 11:05:41 -07:00
slob.c	mm/slab: refactor common ksize KASAN logic into slab_common.c	2019-07-12 11:05:42 -07:00
slub.c	mm/slab: refactor common ksize KASAN logic into slab_common.c	2019-07-12 11:05:42 -07:00
sparse-vmemmap.c
sparse.c
swap_cgroup.c
swap_slots.c
swap_state.c	mm/swap_state.c: simplify total_swapcache_pages() with get_swap_device()	2019-07-12 11:05:43 -07:00
swap.c
swapfile.c	mm, swap: use rbtree for swap_extent	2019-07-12 11:05:43 -07:00
truncate.c
usercopy.c
userfaultfd.c
util.c
vmacache.c
vmalloc.c
vmpressure.c
vmscan.c	mm: vmscan: scan anonymous pages on file refaults	2019-07-12 11:05:39 -07:00
vmstat.c
workingset.c
z3fold.c	mm/z3fold.c: lock z3fold page before __SetPageMovable()	2019-07-12 11:05:40 -07:00
zbud.c
zpool.c
zsmalloc.c
zswap.c