arch: mm: pass userspace fault flag to generic fault handler
authorJohannes Weiner <hannes@cmpxchg.org>
Thu, 12 Sep 2013 22:13:39 +0000 (15:13 -0700)
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Fri, 21 Nov 2014 17:22:56 +0000 (09:22 -0800)
commite2ec2c2b96808afa2f57ec7d7949691146fca341
tree9056b3be2fc19f9a00993a01507776a97b7d3ebd
parent086c6cc5377d0908667e8f7082633aebf45cf95f
arch: mm: pass userspace fault flag to generic fault handler

commit 759496ba6407c6994d6a5ce3a5e74937d7816208 upstream.

Unlike global OOM handling, memory cgroup code will invoke the OOM killer
in any OOM situation because it has no way of telling faults occuring in
kernel context - which could be handled more gracefully - from
user-triggered faults.

Pass a flag that identifies faults originating in user space from the
architecture-specific fault handlers to generic code so that memcg OOM
handling can be improved.

Signed-off-by: Johannes Weiner <hannes@cmpxchg.org>
Reviewed-by: Michal Hocko <mhocko@suse.cz>
Cc: David Rientjes <rientjes@google.com>
Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Cc: azurIt <azurit@pobox.sk>
Cc: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Cong Wang <xiyou.wangcong@gmail.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
29 files changed:
arch/alpha/mm/fault.c
arch/arc/mm/fault.c
arch/arm/mm/fault.c
arch/arm64/mm/fault.c
arch/avr32/mm/fault.c
arch/cris/mm/fault.c
arch/frv/mm/fault.c
arch/hexagon/mm/vm_fault.c
arch/ia64/mm/fault.c
arch/m32r/mm/fault.c
arch/m68k/mm/fault.c
arch/metag/mm/fault.c
arch/microblaze/mm/fault.c
arch/mips/mm/fault.c
arch/mn10300/mm/fault.c
arch/openrisc/mm/fault.c
arch/parisc/mm/fault.c
arch/powerpc/mm/fault.c
arch/s390/mm/fault.c
arch/score/mm/fault.c
arch/sh/mm/fault.c
arch/sparc/mm/fault_32.c
arch/sparc/mm/fault_64.c
arch/tile/mm/fault.c
arch/um/kernel/trap.c
arch/unicore32/mm/fault.c
arch/x86/mm/fault.c
arch/xtensa/mm/fault.c
include/linux/mm.h