A-Team_Digital_Solutions/android_kernel_motorola_sm6375
Watch
2
0
Fork
You've already forked android_kernel_motorola_sm6375
 0
mirror of https://github.com/BobTheBlinker/android_kernel_motorola_sm6375.git synced 2026-10-29 03:01:39 -04:00
Code Issues Projects Releases Packages Wiki Activity

memcg: oom notifier

Browse source 
Considering containers or other resource management softwares in userland,
event notification of OOM in memcg should be implemented.  Now, memcg has
"threshold" notifier which uses eventfd, we can make use of it for oom
notification.

This patch adds oom notification eventfd callback for memcg.  The usage is
very similar to threshold notifier, but control file is memory.oom_control
and no arguments other than eventfd is required.

	% cgroup_event_notifier /cgroup/A/memory.oom_control dummy
	(About cgroup_event_notifier, see Documentation/cgroup/)

Signed-off-by: KAMEZAWA Hiroyuki <[email protected]>
Cc: Daisuke Nishimura <[email protected]>
Cc: Balbir Singh <[email protected]>
Cc: Daisuke Nishimura <[email protected]>
Cc: David Rientjes <[email protected]>
Cc: Davide Libenzi <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
KAMEZAWA Hiroyuki 2010-05-26 14:42:36 -07:00 • committed by Linus Torvalds
commit 9490ff2756
2 changed files with 111 additions and 9 deletions
Download patch file Download diff file Expand all files Collapse all files

20
Documentation/cgroups/memory.txt
View file

@ -184,6 +184,9 @@ limits on the root cgroup.
Note2: When panic_on_oom is set to "2", the whole system will panic.
When oom event notifier is registered, event will be delivered.
(See oom_control section)
2. Locking
The memory controller uses the following hierarchy
@ -488,7 +491,22 @@ threshold in any direction.
It's applicable for root and non-root cgroup.
10. TODO
10. OOM Control
Memory controler implements oom notifier using cgroup notification
API (See cgroups.txt). It allows to register multiple oom notification
delivery and gets notification when oom happens.
To register a notifier, application need:
- create an eventfd using eventfd(2)
- open memory.oom_control file
- write string like "<event_fd> <memory.oom_control>" to cgroup.event_control
Application will be notifier through eventfd when oom happens.
OOM notification doesn't work for root cgroup.
11. TODO
1. Add support for accounting huge pages (as a separate controller)
2. Make per-cgroup scanner reclaim not-shared pages first