Re: [PATCH v5 06/14] memcg: kmem controller infrastructure

From: Kamezawa Hiroyuki
Date: Wed Oct 17 2012 - 02:41:26 EST

(2012/10/16 19:16), Glauber Costa wrote:
> This patch introduces infrastructure for tracking kernel memory pages to
> a given memcg. This will happen whenever the caller includes the flag
> __GFP_KMEMCG flag, and the task belong to a memcg other than the root.
> In memcontrol.h those functions are wrapped in inline acessors. The
> idea is to later on, patch those with static branches, so we don't incur
> any overhead when no mem cgroups with limited kmem are being used.
> Users of this functionality shall interact with the memcg core code
> through the following functions:
> memcg_kmem_newpage_charge: will return true if the group can handle the
> allocation. At this point, struct page is not
> yet allocated.
> memcg_kmem_commit_charge: will either revert the charge, if struct page
> allocation failed, or embed memcg information
> into page_cgroup.
> memcg_kmem_uncharge_page: called at free time, will revert the charge.
> [ v2: improved comments and standardized function names ]
> [ v3: handle no longer opaque, functions not exported,
> even more comments ]
> [ v4: reworked Used bit handling and surroundings for more clarity ]
> [ v5: simplified code for kmemcg compiled out and core functions in
> memcontrol.c, moved kmem code to the middle to avoid forward decls ]
> Signed-off-by: Glauber Costa <glommer@xxxxxxxxxxxxx>
> Acked-by: Michal Hocko <mhocko@xxxxxxx>
> CC: Christoph Lameter <cl@xxxxxxxxx>
> CC: Pekka Enberg <penberg@xxxxxxxxxxxxxx>
> CC: Kamezawa Hiroyuki <kamezawa.hiroyu@xxxxxxxxxxxxxx>
> CC: Johannes Weiner <hannes@xxxxxxxxxxx>
> CC: Tejun Heo <tj@xxxxxxxxxx>

Acked-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@xxxxxxxxxxxxxx>

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