linux-kernel - Re: [PATCH -mm v15 00/13] kmemcg shrinkers

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Date:	Tue, 11 Feb 2014 19:15:26 +0400
From:	Vladimir Davydov <vdavydov@...allels.com>
To:	<dchinner@...hat.com>, <mhocko@...e.cz>, <hannes@...xchg.org>
CC:	<akpm@...ux-foundation.org>, <glommer@...il.com>,
	<rientjes@...gle.com>, <linux-kernel@...r.kernel.org>,
	<linux-mm@...ck.org>, <devel@...nvz.org>
Subject: Re: [PATCH -mm v15 00/13] kmemcg shrinkers

Hi Michal, Johannes, David,

Could you please take a look at this if you have time? Without your
review, it'll never get committed.

Thank you.

On 02/05/2014 10:39 PM, Vladimir Davydov wrote:
> Hi,
>
> This is the 15th iteration of Glauber Costa's patch-set implementing slab
> shrinking on memcg pressure. The main idea is to make the list_lru structure
> used by most FS shrinkers per-memcg. When adding or removing an element from a
> list_lru, we use the page information to figure out which memcg it belongs to
> and relay it to the appropriate list. This allows scanning kmem objects
> accounted to different memcgs independently.
>
> Please note that this patch-set implements slab shrinking only when we hit the
> user memory limit so that kmem allocations will still fail if we are below the
> user memory limit, but close to the kmem limit. I am going to fix this in a
> separate patch-set, but currently it is only worthwhile setting the kmem limit
> to be greater than the user mem limit just to enable per-memcg slab accounting
> and reclaim.
>
> The patch-set is based on top of v3.14-rc1-mmots-2014-02-04-16-48 (there are
> some vmscan cleanups that I need committed there) and organized as follows:
>  - patches 1-4 introduce some minor changes to memcg needed for this set;
>  - patches 5-7 prepare fs for per-memcg list_lru;
>  - patch 8 implement kmemcg reclaim core;
>  - patch 9 make list_lru per-memcg and patch 10 marks sb shrinker memcg-aware;
>  - patch 10 is trivial - it issues shrinkers on memcg destruction;
>  - patches 12 and 13 introduce shrinking of dead kmem caches to facilitate
>    memcg destruction.
>
> Changes in v15:
>  - remove patches that have been merged to -mm;
>  - fix memory barrier usage in per-memcg list_lru implementation;
>  - fix list_lru_destroy(), which might sleep for per-memcg lrus, called from
>    atomic context (__put_super()).
>
> Previous iterations of this patch-set can be found here:
>  - https://lkml.org/lkml/2013/12/16/206 (v14)
>  - https://lkml.org/lkml/2013/12/9/103 (v13)
>  - https://lkml.org/lkml/2013/12/2/141 (v12)
>  - https://lkml.org/lkml/2013/11/25/214 (v11)
>
> Comments are highly appreciated.
>
> Thanks.
>
> Glauber Costa (6):
>   memcg: make cache index determination more robust
>   memcg: consolidate callers of memcg_cache_id
>   memcg: move initialization to memcg creation
>   memcg: flush memcg items upon memcg destruction
>   vmpressure: in-kernel notifications
>   memcg: reap dead memcgs upon global memory pressure
>
> Vladimir Davydov (7):
>   memcg: make for_each_mem_cgroup macros public
>   list_lru, shrinkers: introduce list_lru_shrink_{count,walk}
>   fs: consolidate {nr,free}_cached_objects args in shrink_control
>   fs: do not call destroy_super() in atomic context
>   vmscan: shrink slab on memcg pressure
>   list_lru: add per-memcg lists
>   fs: make shrinker memcg aware
>
>  fs/dcache.c                |   14 +-
>  fs/gfs2/quota.c            |    6 +-
>  fs/inode.c                 |    7 +-
>  fs/internal.h              |    7 +-
>  fs/super.c                 |   44 ++---
>  fs/xfs/xfs_buf.c           |    7 +-
>  fs/xfs/xfs_qm.c            |    7 +-
>  fs/xfs/xfs_super.c         |    7 +-
>  include/linux/fs.h         |    8 +-
>  include/linux/list_lru.h   |  112 ++++++++++---
>  include/linux/memcontrol.h |   50 ++++++
>  include/linux/shrinker.h   |   10 +-
>  include/linux/vmpressure.h |    5 +
>  mm/list_lru.c              |  271 +++++++++++++++++++++++++++---
>  mm/memcontrol.c            |  399 ++++++++++++++++++++++++++++++++++++++------
>  mm/vmpressure.c            |   53 +++++-
>  mm/vmscan.c                |   94 ++++++++---
>  17 files changed, 926 insertions(+), 175 deletions(-)
>

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