David Rientjes 778c14affa mm, oom: base root bonus on current usage ... A 3% of system memory bonus is sometimes too excessive in comparison to other processes. With commit a63d83f427 ("oom: badness heuristic rewrite"), the OOM killer tries to avoid killing privileged tasks by subtracting 3% of overall memory (system or cgroup) from their per-task consumption. But as a result, all root tasks that consume less than 3% of overall memory are considered equal, and so it only takes 33+ privileged tasks pushing the system out of memory for the OOM killer to do something stupid and kill dhclient or other root-owned processes. For example, on a 32G machine it can't tell the difference between the 1M agetty and the 10G fork bomb member. The changelog describes this 3% boost as the equivalent to the global overcommit limit being 3% higher for privileged tasks, but this is not the same as discounting 3% of overall memory from _every privileged task individually_ during OOM selection. Replace the 3% of system memory bonus with a 3% of current memory usage bonus. By giving root tasks a bonus that is proportional to their actual size, they remain comparable even when relatively small. In the example above, the OOM killer will discount the 1M agetty's 256 badness points down to 179, and the 10G fork bomb's 262144 points down to 183500 points and make the right choice, instead of discounting both to 0 and killing agetty because it's first in the task list. Signed-off-by: David Rientjes <rientjes@google.com> Reported-by: Johannes Weiner <hannes@cmpxchg.org> Acked-by: Johannes Weiner <hannes@cmpxchg.org> Cc: Michal Hocko <mhocko@suse.cz> Cc: <stable@vger.kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>		2014-01-30 16:56:56 -08:00
..
backing-dev.c	mm/backing-dev.c: check user buffer length before copying data to the related user buffer	2013-09-11 15:58:03 -07:00
balloon_compaction.c	mm: print more details for bad_page()	2014-01-23 16:36:50 -08:00
bootmem.c	mm/bootmem.c: remove unused local `map'	2013-11-13 12:09:09 +09:00
bounce.c	block: Convert bio_for_each_segment() to bvec_iter	2013-11-23 22:33:49 -08:00
cleancache.c	mm: dump page when hitting a VM_BUG_ON using VM_BUG_ON_PAGE	2014-01-23 16:36:50 -08:00
compaction.c	mm: improve documentation of page_order	2014-01-23 16:36:53 -08:00
debug-pagealloc.c	mm, x86: Remove debug_pagealloc_enabled	2011-12-06 09:24:07 +01:00
dmapool.c	dmapool: make DMAPOOL_DEBUG detect corruption of free marker	2012-12-11 17:22:24 -08:00
fadvise.c	teach SYSCALL_DEFINE<n> how to deal with long long/unsigned long long	2013-03-03 22:46:22 -05:00
failslab.c	switch debugfs to umode_t	2012-01-03 22:54:56 -05:00
filemap_xip.c	seqcount: Add lockdep functionality to seqcount/seqlock structures	2013-11-06 12:40:26 +01:00
filemap.c	Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs	2014-01-28 08:38:04 -08:00
fremap.c	mm: fix use-after-free in sys_remap_file_pages	2014-01-02 14:40:30 -08:00
frontswap.c	frontswap: fix incorrect zeroing and allocation size for frontswap_map	2013-06-12 16:29:46 -07:00
highmem.c	Some nice cleanups, and even a patch my wife did as a "live" demo for	2012-12-20 08:37:05 -08:00
huge_memory.c	Merge branch 'merge' of git://git.kernel.org/pub/scm/linux/kernel/git/benh/powerpc	2014-01-27 21:03:39 -08:00
hugetlb_cgroup.c	mm: dump page when hitting a VM_BUG_ON using VM_BUG_ON_PAGE	2014-01-23 16:36:50 -08:00
hugetlb.c	mm: dump page when hitting a VM_BUG_ON using VM_BUG_ON_PAGE	2014-01-23 16:36:50 -08:00
hwpoison-inject.c	mm/hwpoison: add '#' to hwpoison_inject	2014-01-21 16:19:48 -08:00
init-mm.c	atomic: use <linux/atomic.h>	2011-07-26 16:49:47 -07:00
internal.h	mm/page-writeback.c: do not count anon pages as dirtyable memory	2014-01-29 16:22:39 -08:00
interval_tree.c	mm: add CONFIG_DEBUG_VM_RB build option	2012-10-09 16:22:42 +09:00
Kconfig	zsmalloc: move it under mm	2014-01-30 16:56:55 -08:00
Kconfig.debug	mm: more intensive memory corruption debugging	2012-01-10 16:30:42 -08:00
kmemcheck.c
kmemleak-test.c
kmemleak.c	mm: kmemleak: avoid false negatives on vmalloc'ed objects	2013-11-13 12:09:07 +09:00
ksm.c	mm: audit/fix non-modular users of module_init in core code	2014-01-23 16:36:52 -08:00
list_lru.c	mm: list_lru: fix almost infinite loop causing effective livelock	2013-10-30 12:57:46 -07:00
maccess.c	mm: Map most files to use export.h instead of module.h	2011-10-31 09:20:12 -04:00
madvise.c	mm/hwpoison: fix traversal of hugetlbfs pages to avoid printk flood	2013-09-30 14:31:02 -07:00
Makefile	zsmalloc: move it under mm	2014-01-30 16:56:55 -08:00
memblock.c	memblock: add limit checking to memblock_virt_alloc	2014-01-29 16:22:40 -08:00
memcontrol.c	memcg: remove unused code from kmem_cache_destroy_work_func	2014-01-23 16:36:53 -08:00
memory_hotplug.c	mm/memory_hotplug.c: move register_memory_resource out of the lock_memory_hotplug	2014-01-23 16:36:52 -08:00
memory-failure.c	mm/memory-failure.c: shift page lock from head page to tail page after thp split	2014-01-23 16:36:52 -08:00
memory.c	mm: dump page when hitting a VM_BUG_ON using VM_BUG_ON_PAGE	2014-01-23 16:36:50 -08:00
mempolicy.c	mm/mempolicy.c: fix mempolicy printing in numa_maps	2014-01-30 16:56:56 -08:00
mempool.c	mm/mempool.c: convert kmalloc_node(...GFP_ZERO...) to kzalloc_node(...)	2013-09-11 15:58:14 -07:00
migrate.c	mm/migrate.c: fix setting of cpupid on page migration twice against normal page	2014-01-27 21:02:40 -08:00
mincore.c	mm: do_mincore() cleanup	2014-01-23 16:36:52 -08:00
mlock.c	mm: dump page when hitting a VM_BUG_ON using VM_BUG_ON_PAGE	2014-01-23 16:36:50 -08:00
mm_init.c	mm: bring back /sys/kernel/mm	2014-01-27 21:02:39 -08:00
mmap.c	mm: ignore VM_SOFTDIRTY on VMA merging	2014-01-23 16:36:53 -08:00
mmu_context.c	mm: remove old aio use_mm() comment	2013-05-07 18:38:27 -07:00
mmu_notifier.c	mm: audit/fix non-modular users of module_init in core code	2014-01-23 16:36:52 -08:00
mmzone.c	mm: numa: Change page last {nid,pid} into {cpu,pid}	2013-10-09 14:47:45 +02:00
mprotect.c	mm: numa: do not automatically migrate KSM pages	2014-01-21 16:19:48 -08:00
mremap.c	mm: revert mremap pud_free anti-fix	2013-10-16 21:35:53 -07:00
msync.c
nobootmem.c	mm/nobootmem: free_all_bootmem again	2014-01-23 16:36:52 -08:00
nommu.c	mm: add overcommit_kbytes sysctl variable	2014-01-21 16:19:44 -08:00
oom_kill.c	mm, oom: base root bonus on current usage	2014-01-30 16:56:56 -08:00
page_alloc.c	mm: show message when updating min_free_kbytes in thp	2014-01-23 16:36:52 -08:00
page_cgroup.c	Merge branch 'akpm' (incoming from Andrew)	2014-01-21 19:05:45 -08:00
page_io.c	Merge branch 'for-3.14/core' of git://git.kernel.dk/linux-block	2014-01-30 11:19:05 -08:00
page_isolation.c	mm: memory-hotplug: enable memory hotplug to handle hugepage	2013-09-11 15:57:48 -07:00
page-writeback.c	mm/page-writeback.c: do not count anon pages as dirtyable memory	2014-01-29 16:22:39 -08:00
pagewalk.c	mm/pagewalk.c: fix walk_page_range() access of wrong PTEs	2013-10-30 14:27:03 -07:00
percpu-km.c
percpu-vm.c	mm: fix kernel-doc warnings	2012-06-20 14:39:36 -07:00
percpu.c	Merge branch 'akpm' (incoming from Andrew)	2014-01-21 19:05:45 -08:00
pgtable-generic.c	mm: fix TLB flush race between migration, and change_protection_range	2013-12-18 19:04:51 -08:00
process_vm_access.c	Fix: compat_rw_copy_check_uvector() misuse in aio, readv, writev, and security keys	2013-03-12 11:05:45 -07:00
quicklist.c	mm: delete various needless include <linux/module.h>	2011-10-31 09:20:11 -04:00
readahead.c	mm/readahead.c: fix do_readahead() for no readpage(s)	2014-01-29 16:22:40 -08:00
rmap.c	mm/rmap: fix coccinelle warnings	2014-01-23 16:36:53 -08:00
shmem.c	Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs	2014-01-28 08:38:04 -08:00
slab_common.c	slab: fix wrong retval on kmem_cache_create_memcg error path	2014-01-29 16:22:40 -08:00
slab.c	Merge branch 'slab/next' of git://git.kernel.org/pub/scm/linux/kernel/git/penberg/linux	2013-11-22 08:10:34 -08:00
slab.h	memcg, slab: RCU protect memcg_params for root caches	2014-01-23 16:36:51 -08:00
slob.c	mm/sl[aou]b: Move kmallocXXX functions to common code	2013-09-04 20:51:33 +03:00
slub.c	mm/slub.c: fix page->_count corruption (again)	2014-01-30 16:56:56 -08:00
sparse-vmemmap.c	mm/sparse: use memblock apis for early memory allocations	2014-01-21 16:19:47 -08:00
sparse.c	mm/sparse: use memblock apis for early memory allocations	2014-01-21 16:19:47 -08:00
swap_state.c	mm: dump page when hitting a VM_BUG_ON using VM_BUG_ON_PAGE	2014-01-23 16:36:50 -08:00
swap.c	mm: dump page when hitting a VM_BUG_ON using VM_BUG_ON_PAGE	2014-01-23 16:36:50 -08:00
swapfile.c	mm/swapfile.c: do not skip lowest_bit in scan_swap_map() scan loop	2014-01-23 16:36:53 -08:00
truncate.c	truncate: drop 'oldsize' truncate_pagecache() parameter	2013-09-12 15:38:02 -07:00
util.c	mm: add overcommit_kbytes sysctl variable	2014-01-21 16:19:44 -08:00
vmalloc.c	Revert "mm/vmalloc: interchage the implementation of vmalloc_to_{pfn,page}"	2014-01-27 21:02:39 -08:00
vmpressure.c	memcg: make cgroup_event deal with mem_cgroup instead of cgroup_subsys_state	2013-11-22 18:20:43 -05:00
vmscan.c	mm/page-writeback.c: do not count anon pages as dirtyable memory	2014-01-29 16:22:39 -08:00
vmstat.c	mm: numa: return the number of base pages altered by protection changes	2013-11-13 12:09:11 +09:00
zbud.c	mm/zbud: fix some trivial typos in comments	2013-09-11 15:57:35 -07:00
zsmalloc.c	zsmalloc: add copyright	2014-01-30 16:56:55 -08:00
zswap.c	mm/zswap.c: change params from hidden to ro	2014-01-23 16:36:50 -08:00