Tejun Heo b23afb93d3 memcg: punt high overage reclaim to return-to-userland path ... Currently, try_charge() tries to reclaim memory synchronously when the high limit is breached; however, if the allocation doesn't have __GFP_WAIT, synchronous reclaim is skipped. If a process performs only speculative allocations, it can blow way past the high limit. This is actually easily reproducible by simply doing "find /". slab/slub allocator tries speculative allocations first, so as long as there's memory which can be consumed without blocking, it can keep allocating memory regardless of the high limit. This patch makes try_charge() always punt the over-high reclaim to the return-to-userland path. If try_charge() detects that high limit is breached, it adds the overage to current->memcg_nr_pages_over_high and schedules execution of mem_cgroup_handle_over_high() which performs synchronous reclaim from the return-to-userland path. As long as kernel doesn't have a run-away allocation spree, this should provide enough protection while making kmemcg behave more consistently. It also has the following benefits. - All over-high reclaims can use GFP_KERNEL regardless of the specific gfp mask in use, e.g. GFP_NOFS, when the limit was breached. - It copes with prio inversion. Previously, a low-prio task with small memory.high might perform over-high reclaim with a bunch of locks held. If a higher prio task needed any of these locks, it would have to wait until the low prio task finished reclaim and released the locks. By handing over-high reclaim to the task exit path this issue can be avoided. Signed-off-by: Tejun Heo <tj@kernel.org> Acked-by: Michal Hocko <mhocko@kernel.org> Reviewed-by: Vladimir Davydov <vdavydov@parallels.com> Acked-by: Johannes Weiner <hannes@cmpxchg.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>		2015-11-05 19:34:48 -08:00
..
kasan	kasan: fix last shadow judgement in memory_is_poisoned_16()	2015-09-17 21:16:07 -07:00
backing-dev.c	writeback: remove broken rbtree_postorder_for_each_entry_safe() usage in cgwb_bdi_destroy()	2015-10-21 08:17:29 -06:00
balloon_compaction.c	mm/balloon_compaction: fix deflation when compaction is disabled	2014-10-29 16:33:15 -07:00
bootmem.c	bootmem: avoid freeing to bootmem after bootmem is done	2015-09-08 15:35:28 -07:00
cleancache.c	cleancache: remove limit on the number of cleancache enabled filesystems	2015-04-14 16:49:03 -07:00
cma_debug.c	mm/cma_debug: correct size input to bitmap function	2015-07-17 16:39:54 -07:00
cma.c	mm: cma: fix incorrect type conversion for size during dma allocation	2015-10-23 17:55:10 +09:00
cma.h	mm: cma: mark cma_bitmap_maxno() inline in header	2015-08-14 15:56:32 -07:00
compaction.c	mm/compaction: correct to flush migrated pages if pageblock skip happens	2015-09-08 15:35:28 -07:00
debug-pagealloc.c	mm/debug-pagealloc: make debug-pagealloc boottime configurable	2014-12-13 12:42:48 -08:00
debug.c	mm: introduce idle page tracking	2015-09-10 13:29:01 -07:00
dmapool.c	dmapool: fix overflow condition in pool_find_page()	2015-10-01 21:42:35 -04:00
early_ioremap.c	mm/early_ioremap: add explicit #include of asm/early_ioremap.h	2015-09-11 15:21:34 -07:00
fadvise.c	writeback: implement and use inode_congested()	2015-06-02 08:33:35 -06:00
failslab.c	debugfs: Pass bool pointer to debugfs_create_bool()	2015-10-04 11:36:07 +01:00
filemap.c	mm: make sendfile(2) killable	2015-10-23 17:55:10 +09:00
frame_vector.c	[media] mm: Provide new get_vaddr_frames() helper	2015-08-16 13:02:47 -03:00
frontswap.c	frontswap: allow multiple backends	2015-06-24 17:49:45 -07:00
gup.c	mm: make GUP handle pfn mapping unless FOLL_GET is requested	2015-09-04 16:54:41 -07:00
highmem.c
huge_memory.c	- Support for new MM features in ARCv2 cores (THP, PAE40)	2015-11-03 13:21:09 -08:00
hugetlb_cgroup.c	mm: page_counter: pull "-1" handling out of page_counter_memparse()	2015-02-11 17:06:02 -08:00
hugetlb.c	mm: hugetlbfs: skip shared VMAs when unmapping private pages to satisfy a fault	2015-10-01 21:42:35 -04:00
hwpoison-inject.c	hwpoison: use page_cgroup_ino for filtering by memcg	2015-09-10 13:29:01 -07:00
init-mm.c
internal.h	mm/compaction: correct to flush migrated pages if pageblock skip happens	2015-09-08 15:35:28 -07:00
interval_tree.c	mm: replace vma->sharead.linear with vma->shared	2015-02-10 14:30:31 -08:00
Kconfig	media updates for v4.3-rc1	2015-09-11 16:42:39 -07:00
Kconfig.debug	mm/debug_pagealloc: remove obsolete Kconfig options	2015-01-08 15:10:52 -08:00
kmemcheck.c
kmemleak-test.c
kmemleak.c	mm/kmemleak.c: remove unneeded initialization of object to NULL	2015-11-05 19:34:48 -08:00
ksm.c	mm: remove rest of ACCESS_ONCE() usages	2015-04-15 16:35:18 -07:00
list_lru.c	list_lru: don't call list_lru_from_kmem if the list_head is empty	2015-09-08 15:35:28 -07:00
maccess.c	uaccess: reimplement probe_kernel_address() using probe_kernel_read()	2015-11-05 19:34:48 -08:00
madvise.c	mm: madvise allow remove operation for hugetlbfs	2015-09-08 15:35:28 -07:00
Makefile	media updates for v4.3-rc1	2015-09-11 16:42:39 -07:00
memblock.c	mm/memblock.c: fix comment in __next_mem_range()	2015-09-08 15:35:28 -07:00
memcontrol.c	memcg: punt high overage reclaim to return-to-userland path	2015-11-05 19:34:48 -08:00
memory_hotplug.c	mm: memory hotplug with an existing resource	2015-10-23 14:19:58 +01:00
memory-failure.c	hwpoison: use page_cgroup_ino for filtering by memcg	2015-09-10 13:29:01 -07:00
memory.c	mm, dax: fix DAX deadlocks	2015-10-16 11:42:28 -07:00
mempolicy.c	mm: rename alloc_pages_exact_node() to __alloc_pages_node()	2015-09-08 15:35:28 -07:00
mempool.c	mm/mempool: allow NULL `pool' pointer in mempool_destroy()	2015-09-08 15:35:28 -07:00
memtest.c	memtest: remove unused header files	2015-09-08 15:35:28 -07:00
migrate.c	memcg: fix dirty page migration	2015-10-01 21:42:35 -04:00
mincore.c	mincore: apply page table walker on do_mincore()	2015-02-11 17:06:06 -08:00
mlock.c	mm/mlock.c: reorganize mlockall() return values and remove goto-out label	2015-11-05 19:34:48 -08:00
mm_init.c	mm: meminit: remove mminit_verify_page_links	2015-06-30 19:44:56 -07:00
mmap.c	mm/mmap.c: remove useless statement "vma = NULL" in find_vma()	2015-11-05 19:34:48 -08:00
mmu_context.c
mmu_notifier.c	mmu-notifier: add clear_young callback	2015-09-10 13:29:01 -07:00
mmzone.c	mm: microoptimize zonelist operations	2015-02-11 17:06:02 -08:00
mprotect.c	userfaultfd: teach vma_merge to merge across vma->vm_userfaultfd_ctx	2015-09-04 16:54:41 -07:00
mremap.c	mremap: simplify the "overlap" check in mremap_to()	2015-09-04 16:54:41 -07:00
msync.c	mm: remove rest usage of VM_NONLINEAR and pte_file()	2015-02-10 14:30:31 -08:00
nobootmem.c	mm: page_alloc: pass PFN to __free_pages_bootmem	2015-06-30 19:44:55 -07:00
nommu.c	mm, mpx: add "vm_flags_t vm_flags" arg to do_mmap_pgoff()	2015-09-10 13:29:01 -07:00
oom_kill.c	mm, oom: remove unnecessary variable	2015-09-08 15:35:28 -07:00
page_alloc.c	debugfs: Pass bool pointer to debugfs_create_bool()	2015-10-04 11:36:07 +01:00
page_counter.c	mm: page_counter: pull "-1" handling out of page_counter_memparse()	2015-02-11 17:06:02 -08:00
page_ext.c	mm: introduce idle page tracking	2015-09-10 13:29:01 -07:00
page_idle.c	mm: introduce idle page tracking	2015-09-10 13:29:01 -07:00
page_io.c	fs: use helper bio_add_page() instead of open coding on bi_io_vec	2015-08-13 12:32:00 -06:00
page_isolation.c	mm, page_isolation: make set/unset_migratetype_isolate() file-local	2015-09-08 15:35:28 -07:00
page_owner.c	mm/page_owner: set correct gfp_mask on page_owner	2015-07-17 16:39:54 -07:00
page-writeback.c	writeback: fix incorrect calculation of available memory for memcg domains	2015-10-12 10:31:13 -06:00
pagewalk.c	mm/pagewalk.c: prevent positive return value of walk_page_test() from being passed to callers	2015-03-25 16:20:30 -07:00
percpu-km.c
percpu-vm.c
percpu.c	percpu: clean up of schunk->map[] assignment in pcpu_setup_first_chunk	2015-07-21 11:31:00 -04:00
pgtable-generic.c	mm,thp: introduce flush_pmd_tlb_range	2015-10-17 17:48:20 +05:30
process_vm_access.c	process_vm_access: switch to {compat_,}import_iovec()	2015-04-11 22:27:12 -04:00
quicklist.c
readahead.c	mm, fs: obey gfp_mapping for add_to_page_cache()	2015-10-16 11:42:28 -07:00
rmap.c	mm: introduce idle page tracking	2015-09-10 13:29:01 -07:00
shmem.c	shmem: recalculate file inode when fstat	2015-09-08 15:35:28 -07:00
slab_common.c	mm/slab_common.c: initialize kmem_cache pointer to NULL	2015-11-05 19:34:48 -08:00
slab.c	mm: slab: only move management objects off-slab for sizes larger than KMALLOC_MIN_SIZE	2015-11-05 19:34:48 -08:00
slab.h	mm/slab_common.c: clear pointers to per memcg caches on destroy	2015-11-05 19:34:48 -08:00
slob.c	mm: rename alloc_pages_exact_node() to __alloc_pages_node()	2015-09-08 15:35:28 -07:00
slub.c	mm/slub: calculate start order with reserved in consideration	2015-11-05 19:34:48 -08:00
sparse-vmemmap.c
sparse.c
swap_cgroup.c	mm: page_cgroup: rename file to mm/swap_cgroup.c	2014-12-10 17:41:09 -08:00
swap_state.c	mm: swap: zswap: maybe_preload & refactoring	2015-09-08 15:35:28 -07:00
swap.c	mm: introduce idle page tracking	2015-09-10 13:29:01 -07:00
swapfile.c	mm: /proc/pid/smaps:: show proportional swap share of the mapping	2015-09-08 15:35:28 -07:00
truncate.c	memcg: add per cgroup dirty page accounting	2015-06-02 08:33:33 -06:00
userfaultfd.c	userfaultfd: avoid mmap_sem read recursion in mcopy_atomic	2015-09-04 16:54:41 -07:00
util.c	mm: uninline and cleanup page-mapping related helpers	2015-04-15 16:35:19 -07:00
vmacache.c	mm,vmacache: count number of system-wide flushes	2014-12-13 12:42:48 -08:00
vmalloc.c	mm: get rid of 'vmalloc_info' from /proc/meminfo	2015-11-01 17:09:15 -08:00
vmpressure.c	mm/vmpressure.c: fix race in vmpressure_work_fn()	2014-12-02 17:32:07 -08:00
vmscan.c	vmscan: fix sane_reclaim helper for legacy memcg	2015-09-22 15:09:53 -07:00
vmstat.c	vmstat: explicitly schedule per-cpu work on the CPU we need it to run on	2015-10-15 13:01:50 -07:00
workingset.c	list_lru: add helpers to isolate items	2015-02-12 18:54:10 -08:00
zbud.c	mm: zbud: constify the zbud_ops	2015-09-08 15:35:28 -07:00
zpool.c	zpool: add zpool_has_pool()	2015-09-10 13:29:01 -07:00
zsmalloc.c	mm: zpool: constify the zpool_ops	2015-09-08 15:35:28 -07:00
zswap.c	zswap: change zpool/compressor at runtime	2015-09-10 13:29:01 -07:00