linux-kernel - [PATCH 4/4] memcg: Document memory.low_limit_in

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Date:	Mon, 28 Apr 2014 14:26:45 +0200
From:	Michal Hocko <mhocko@...e.cz>
To:	Johannes Weiner <hannes@...xchg.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
Cc:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	Greg Thelen <gthelen@...gle.com>,
	Michel Lespinasse <walken@...gle.com>,
	Tejun Heo <tj@...nel.org>, Hugh Dickins <hughd@...gle.com>,
	Roman Gushchin <klamm@...dex-team.ru>,
	LKML <linux-kernel@...r.kernel.org>, <linux-mm@...ck.org>
Subject: [PATCH 4/4] memcg: Document memory.low_limit_in_bytes

Describe low_limit_in_bytes and its effect.

Signed-off-by: Michal Hocko <mhocko@...e.cz>
---
 Documentation/cgroups/memory.txt | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/Documentation/cgroups/memory.txt b/Documentation/cgroups/memory.txt
index add1be001416..a52913fe96fb 100644
--- a/Documentation/cgroups/memory.txt
+++ b/Documentation/cgroups/memory.txt
@@ -57,6 +57,7 @@ Brief summary of control files.
  memory.memsw.usage_in_bytes	 # show current res_counter usage for memory+Swap
 				 (See 5.5 for details)
  memory.limit_in_bytes		 # set/show limit of memory usage
+ memory.low_limit_in_bytes	 # set/show low limit for memory reclaim
  memory.memsw.limit_in_bytes	 # set/show limit of memory+Swap usage
  memory.failcnt			 # show the number of memory usage hits limits
  memory.memsw.failcnt		 # show the number of memory+Swap hits limits
@@ -249,6 +250,14 @@ is the objective of the reclaim. The global reclaim aims at balancing
 zones' watermarks while the limit reclaim frees some memory to allow new
 charges.
 
+Groups might be also protected from both global and limit reclaim by
+low_limit_in_bytes knob. If the limit is non-zero the reclaim logic
+doesn't include groups (and their subgroups - see 6. Hierarchy support)
+which are bellow the low limit if there is other eligible cgroup in the
+reclaimed hierarchy. If all groups which participate reclaim are under
+their low limits then all of them are reclaimed and the low limit is
+ignored.
+
 NOTE: Hard limit reclaim does not work for the root cgroup, since we cannot set
 any limits on the root cgroup.
 
-- 
2.0.0.rc0

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