Mandeep Singh Baines dabb16f639 oom: allow a non-CAP_SYS_RESOURCE proces to oom_score_adj down ...

We'd like to be able to oom_score_adj a process up/down as it
enters/leaves the foreground.  Currently, it is not possible to oom_adj
down without CAP_SYS_RESOURCE.  This patch allows a task to decrease its
oom_score_adj back to the value that a CAP_SYS_RESOURCE thread set it to
or its inherited value at fork.  Assuming the thread that has forked it
has oom_score_adj of 0, each process could decrease it back from 0 upon
activation unless a CAP_SYS_RESOURCE thread elevated it to something
higher.

Alternative considered:

* a setuid binary
* a daemon with CAP_SYS_RESOURCE

Since you don't wan't all processes to be able to reduce their oom_adj, a
setuid or daemon implementation would be complex.  The alternatives also
have much higher overhead.

This patch updated from original patch based on feedback from David
Rientjes.

Signed-off-by: Mandeep Singh Baines <msb@chromium.org>
Acked-by: David Rientjes <rientjes@google.com>
Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Cc: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Cc: Rik van Riel <riel@redhat.com>
Cc: Ying Han <yinghan@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

2011-01-13 17:32:35 -08:00

..

array.c

proc: use seq_puts()/seq_putc() where possible

2011-01-13 08:03:16 -08:00

base.c

oom: allow a non-CAP_SYS_RESOURCE proces to oom_score_adj down

2011-01-13 17:32:35 -08:00

cmdline.c

proc: switch /proc/cmdline to seq_file

2008-10-23 14:29:04 +04:00

consoles.c

proc: move proc_console.c to fs/proc/consoles.c

2011-01-13 08:03:17 -08:00

cpuinfo.c

proc: move /proc/cpuinfo code to fs/proc/cpuinfo.c

2008-10-23 15:05:11 +04:00

devices.c

proc: use seq_puts()/seq_putc() where possible

2011-01-13 08:03:16 -08:00

generic.c

proc: less LOCK/UNLOCK in remove_proc_entry()

2011-01-13 08:03:17 -08:00

inode.c

proc: ->low_ino cleanup

2011-01-13 08:03:16 -08:00

internal.h

proc: ->low_ino cleanup

2011-01-13 08:03:16 -08:00

interrupts.c

proc: move /proc/interrupts boilerplate code to fs/proc/interrupts.c

2008-10-23 15:15:46 +04:00

Kconfig

vmcore: it is not experimental any more

2010-10-26 16:52:05 -07:00

kcore.c

/proc/kcore: fix seeking

2011-01-13 08:03:17 -08:00

kmsg.c

procfs: Use generic_file_llseek in /proc/kmsg

2010-04-09 16:35:41 +02:00

loadavg.c

sched, timers: cleanup avenrun users

2009-05-15 15:32:45 +02:00

Makefile

proc: move proc_console.c to fs/proc/consoles.c

2011-01-13 08:03:17 -08:00

meminfo.c

hwpoison: fix/proc/meminfo alignment

2009-10-29 07:39:25 -07:00

mmu.c

fs/proc/mmu.c: headers butchery

2007-10-17 08:42:48 -07:00

nommu.c

include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h

2010-03-30 22:02:32 +09:00

page.c

kpagecount: add slab page checking because _mapcount is in a union

2011-01-13 08:03:17 -08:00

proc_devtree.c

of: Drop properties with "/" in their name

2010-06-13 18:12:24 -06:00

proc_net.c

include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h

2010-03-30 22:02:32 +09:00

proc_sysctl.c

fs: provide rcu-walk aware permission i_ops

2011-01-07 17:50:29 +11:00

proc_tty.c

proc: use seq_puts()/seq_putc() where possible

2011-01-13 08:03:16 -08:00

root.c

switch procfs to ->mount()

2010-10-29 04:17:01 -04:00

softirqs.c

proc: use seq_puts()/seq_putc() where possible

2011-01-13 08:03:16 -08:00

stat.c

proc: use seq_puts()/seq_putc() where possible

2011-01-13 08:03:16 -08:00

task_mmu.c

mm: smaps: export mlock information

2011-01-13 17:32:33 -08:00

task_nommu.c

proc: use unsigned long inside /proc/*/statm

2011-01-13 08:03:16 -08:00

uptime.c

[PATCH] Fix idle time field in /proc/uptime

2009-09-24 10:16:24 +02:00

version.c

proc: switch /proc/version to seq_file

2008-10-23 14:19:58 +04:00

vmcore.c

ARM: 6485/5: proc/vmcore - allow archs to override vmcore_elf_check_arch()

2010-11-30 13:39:55 +00:00