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authorGlauber Costa <glommer@parallels.com>2011-12-11 21:47:03 +0000
committerDavid S. Miller <davem@davemloft.net>2011-12-12 19:04:10 -0500
commite1aab161e0135aafcd439be20b4f35e4b0922d95 (patch)
treed0bcdf7a34a34020079238027b431ffc6dece307 /Documentation/cgroups
parent180d8cd942ce336b2c869d324855c40c5db478ad (diff)
downloadop-kernel-dev-e1aab161e0135aafcd439be20b4f35e4b0922d95.zip
op-kernel-dev-e1aab161e0135aafcd439be20b4f35e4b0922d95.tar.gz
socket: initial cgroup code.
The goal of this work is to move the memory pressure tcp controls to a cgroup, instead of just relying on global conditions. To avoid excessive overhead in the network fast paths, the code that accounts allocated memory to a cgroup is hidden inside a static_branch(). This branch is patched out until the first non-root cgroup is created. So when nobody is using cgroups, even if it is mounted, no significant performance penalty should be seen. This patch handles the generic part of the code, and has nothing tcp-specific. Signed-off-by: Glauber Costa <glommer@parallels.com> Reviewed-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujtsu.com> CC: Kirill A. Shutemov <kirill@shutemov.name> CC: David S. Miller <davem@davemloft.net> CC: Eric W. Biederman <ebiederm@xmission.com> CC: Eric Dumazet <eric.dumazet@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'Documentation/cgroups')
-rw-r--r--Documentation/cgroups/memory.txt4
1 files changed, 3 insertions, 1 deletions
diff --git a/Documentation/cgroups/memory.txt b/Documentation/cgroups/memory.txt
index f245324..23a8dc5 100644
--- a/Documentation/cgroups/memory.txt
+++ b/Documentation/cgroups/memory.txt
@@ -289,7 +289,9 @@ to trigger slab reclaim when those limits are reached.
2.7.1 Current Kernel Memory resources accounted
-None
+* sockets memory pressure: some sockets protocols have memory pressure
+thresholds. The Memory Controller allows them to be controlled individually
+per cgroup, instead of globally.
3. User Interface
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