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Commit 92e79349 authored by Glauber Costa's avatar Glauber Costa Committed by Linus Torvalds
Browse files

kmem: add slab-specific documentation about the kmem controller 



Signed-off-by: default avatarGlauber Costa <glommer@parallels.com>
Cc: Christoph Lameter <cl@linux.com>
Cc: David Rientjes <rientjes@google.com>
Cc: Frederic Weisbecker <fweisbec@redhat.com>
Cc: Greg Thelen <gthelen@google.com>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: JoonSoo Kim <js1304@gmail.com>
Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Cc: Mel Gorman <mel@csn.ul.ie>
Cc: Michal Hocko <mhocko@suse.cz>
Cc: Pekka Enberg <penberg@cs.helsinki.fi>
Cc: Rik van Riel <riel@redhat.com>
Cc: Suleiman Souhlal <suleiman@google.com>
Cc: Tejun Heo <tj@kernel.org>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent 107dab5c

Documentation/cgroups/memory.txt

+7 −0
Original line number Diff line number Diff line
@@ -301,6 +301,13 @@ to trigger slab reclaim when those limits are reached. 
kernel memory, we prevent new processes from being created when the kernel

memory usage is too high.



* slab pages: pages allocated by the SLAB or SLUB allocator are tracked. A copy

of each kmem_cache is created everytime the cache is touched by the first time

from inside the memcg. The creation is done lazily, so some objects can still be

skipped while the cache is being created. All objects in a slab page should

belong to the same memcg. This only fails to hold when a task is migrated to a

different memcg during the page allocation by the cache.



* sockets memory pressure: some sockets protocols have memory pressure

thresholds. The Memory Controller allows them to be controlled individually

per cgroup, instead of globally.