From: Tejun Heo <tj@kernel.org>
To: Vladimir Davydov <vdavydov@parallels.com>
Cc: Andrew Morton <akpm@linux-foundation.org>,
Johannes Weiner <hannes@cmpxchg.org>,
Michal Hocko <mhocko@suse.cz>, Greg Thelen <gthelen@google.com>,
Dave Chinner <david@fromorbit.com>,
Glauber Costa <glommer@gmail.com>,
Suleiman Souhlal <suleiman@google.com>,
Kamezawa Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>,
linux-kernel@vger.kernel.org, linux-mm@kvack.org,
cgroups@vger.kernel.org
Subject: Re: [PATCH -mm 00/14] Per memcg slab shrinkers
Date: Sun, 21 Sep 2014 12:00:12 -0400 [thread overview]
Message-ID: <20140921160012.GA996@mtj.dyndns.org> (raw)
In-Reply-To: <cover.1411301245.git.vdavydov@parallels.com>
Hello,
On Sun, Sep 21, 2014 at 07:14:32PM +0400, Vladimir Davydov wrote:
...
> list. This is really important, because this allows us to release
> memcg_cache_id used for indexing in per-memcg arrays. If we don't do
> this, the arrays will grow uncontrollably, which is really bad. Note, in
> comparison to user memory reparenting, which Johannes is going to get
I don't know the code well and haven't read the patches and could
easilya be completely off the mark, but, if the size of slab array is
the only issue, wouldn't it be easier to separate that part out? The
indexing is only necessary for allocating new items, right? Can't
that part be shutdown and the index freed on offline and the rest stay
till release? Things like reparenting tends to add fair amount of
complexity and hot path overheads which aren't necessary otherwise.
Thanks.
--
tejun
next prev parent reply other threads:[~2014-09-21 16:00 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-09-21 15:14 [PATCH -mm 00/14] Per memcg slab shrinkers Vladimir Davydov
2014-09-21 15:14 ` [PATCH -mm 01/14] list_lru: introduce list_lru_shrink_{count,walk} Vladimir Davydov
2014-09-21 15:14 ` [PATCH -mm 02/14] fs: consolidate {nr,free}_cached_objects args in shrink_control Vladimir Davydov
2014-09-21 15:14 ` [PATCH -mm 03/14] vmscan: shrink slab on memcg pressure Vladimir Davydov
2014-09-21 15:14 ` [PATCH -mm 04/14] memcg: use mem_cgroup_id for per memcg cache naming Vladimir Davydov
2014-09-21 15:14 ` [PATCH -mm 05/14] memcg: add pointer to owner cache to memcg_cache_params Vladimir Davydov
2014-09-21 15:14 ` [PATCH -mm 06/14] memcg: keep all children of each root cache on a list Vladimir Davydov
2014-09-21 15:14 ` [PATCH -mm 07/14] memcg: update memcg_caches array entries on the slab side Vladimir Davydov
2014-09-21 15:14 ` [PATCH -mm 08/14] memcg: release memcg_cache_id on css offline Vladimir Davydov
2014-09-21 15:14 ` [PATCH -mm 09/14] memcg: rename some cache id related variables Vladimir Davydov
2014-09-21 15:14 ` [PATCH -mm 10/14] memcg: add rwsem to sync against memcg_caches arrays relocation Vladimir Davydov
2014-09-21 15:14 ` [PATCH -mm 11/14] list_lru: get rid of ->active_nodes Vladimir Davydov
2014-09-21 15:14 ` [PATCH -mm 12/14] list_lru: organize all list_lrus to list Vladimir Davydov
2014-09-21 15:14 ` [PATCH -mm 13/14] list_lru: introduce per-memcg lists Vladimir Davydov
2014-09-21 15:14 ` [PATCH -mm 14/14] fs: make shrinker memcg aware Vladimir Davydov
2014-09-21 16:00 ` Tejun Heo [this message]
2014-09-22 7:04 ` [PATCH -mm 00/14] Per memcg slab shrinkers Vladimir Davydov
2014-09-29 7:02 ` Vladimir Davydov
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