From: Kirill Tkhai <ktkhai@virtuozzo.com>
To: Shakeel Butt <shakeelb@google.com>,
Stephen Rothwell <sfr@canb.auug.org.au>
Cc: Andrew Morton <akpm@linux-foundation.org>,
gregkh@linuxfoundation.org, rafael@kernel.org,
Alexander Viro <viro@zeniv.linux.org.uk>,
"Darrick J. Wong" <darrick.wong@oracle.com>,
Paul McKenney <paulmck@linux.vnet.ibm.com>,
josh@joshtriplett.org, Steven Rostedt <rostedt@goodmis.org>,
mathieu.desnoyers@efficios.com, jiangshanlai@gmail.com,
Hugh Dickins <hughd@google.com>,
shuah@kernel.org, robh@kernel.org, ulf.hansson@linaro.org,
aspriel@gmail.com, vivek.gautam@codeaurora.org,
robin.murphy@arm.com, joe@perches.com,
heikki.krogerus@linux.intel.com,
Vladimir Davydov <vdavydov.dev@gmail.com>,
Michal Hocko <mhocko@suse.com>,
Chris Wilson <chris@chris-wilson.co.uk>,
Tetsuo Handa <penguin-kernel@i-love.sakura.ne.jp>,
Andrey Ryabinin <aryabinin@virtuozzo.com>,
Matthew Wilcox <willy@infradead.org>,
Huang Ying <ying.huang@intel.com>,
jbacik@fb.com, Ingo Molnar <mingo@kernel.org>,
mhiramat@kernel.org, LKML <linux-kernel@vger.kernel.org>,
linux-fsdevel <linux-fsdevel@vger.kernel.org>,
Linux MM <linux-mm@kvack.org>
Subject: Re: [PATCH RFC 00/10] Introduce lockless shrink_slab()
Date: Wed, 8 Aug 2018 13:18:24 +0300 [thread overview]
Message-ID: <493967b5-cb56-4a88-c2fb-44238e2823ed@virtuozzo.com> (raw)
In-Reply-To: <CALvZod4CAA50sPB1V9bZVOZ__rOT=Ys8tLv+m-S-kP3NLubSqQ@mail.gmail.com>
On 08.08.2018 08:39, Shakeel Butt wrote:
> On Tue, Aug 7, 2018 at 6:12 PM Stephen Rothwell <sfr@canb.auug.org.au> wrote:
>>
>> Hi Kirill,
>>
>> On Tue, 07 Aug 2018 18:37:19 +0300 Kirill Tkhai <ktkhai@virtuozzo.com> wrote:
>>>
>>> After bitmaps of not-empty memcg shrinkers were implemented
>>> (see "[PATCH v9 00/17] Improve shrink_slab() scalability..."
>>> series, which is already in mm tree), all the evil in perf
>>> trace has moved from shrink_slab() to down_read_trylock().
>>> As reported by Shakeel Butt:
>>>
>>> > I created 255 memcgs, 255 ext4 mounts and made each memcg create a
>>> > file containing few KiBs on corresponding mount. Then in a separate
>>> > memcg of 200 MiB limit ran a fork-bomb.
>>> >
>>> > I ran the "perf record -ag -- sleep 60" and below are the results:
>>> > + 47.49% fb.sh [kernel.kallsyms] [k] down_read_trylock
>>> > + 30.72% fb.sh [kernel.kallsyms] [k] up_read
>>> > + 9.51% fb.sh [kernel.kallsyms] [k] mem_cgroup_iter
>>> > + 1.69% fb.sh [kernel.kallsyms] [k] shrink_node_memcg
>>> > + 1.35% fb.sh [kernel.kallsyms] [k] mem_cgroup_protected
>>> > + 1.05% fb.sh [kernel.kallsyms] [k] queued_spin_lock_slowpath
>>> > + 0.85% fb.sh [kernel.kallsyms] [k] _raw_spin_lock
>>> > + 0.78% fb.sh [kernel.kallsyms] [k] lruvec_lru_size
>>> > + 0.57% fb.sh [kernel.kallsyms] [k] shrink_node
>>> > + 0.54% fb.sh [kernel.kallsyms] [k] queue_work_on
>>> > + 0.46% fb.sh [kernel.kallsyms] [k] shrink_slab_memcg
>>>
>>> The patchset continues to improve shrink_slab() scalability and makes
>>> it lockless completely. Here are several steps for that:
>>
>> So do you have any numbers for after theses changes?
>>
>
> I will do the same experiment as before with these patches sometime
> this or next week.
Thanks, Shakeel!
> BTW Kirill, thanks for pushing this.
>
> regards,
> Shakeel
>
prev parent reply other threads:[~2018-08-08 12:37 UTC|newest]
Thread overview: 40+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-08-07 15:37 [PATCH RFC 00/10] Introduce lockless shrink_slab() Kirill Tkhai
2018-08-07 15:37 ` [PATCH RFC 01/10] rcu: Make CONFIG_SRCU unconditionally enabled Kirill Tkhai
2018-08-08 0:55 ` Steven Rostedt
2018-08-08 1:05 ` Stephen Rothwell
2018-08-08 9:46 ` Kirill Tkhai
2018-08-08 1:08 ` Stephen Rothwell
2018-08-08 9:59 ` Kirill Tkhai
2018-08-08 11:04 ` Stephen Rothwell
2018-08-08 7:20 ` Michal Hocko
2018-08-08 10:17 ` Kirill Tkhai
2018-08-08 10:27 ` Michal Hocko
2018-08-08 21:31 ` Dave Chinner
2018-08-09 0:07 ` Matthew Wilcox
2018-08-09 7:45 ` Greg KH
2018-08-09 10:22 ` Kirill Tkhai
2018-08-08 16:13 ` Josh Triplett
2018-08-08 16:23 ` Kirill Tkhai
2018-08-08 16:30 ` Kirill Tkhai
2018-08-08 18:01 ` Josh Triplett
2018-08-08 23:02 ` Shakeel Butt
2018-08-08 23:09 ` Josh Triplett
2018-08-07 15:37 ` [PATCH RFC 02/10] mm: Make shrink_slab() lockless Kirill Tkhai
2018-08-08 11:51 ` Kirill Tkhai
2018-08-08 13:20 ` [PATCH RFC v2 " Kirill Tkhai
2018-08-09 7:14 ` Michal Hocko
2018-08-09 9:21 ` Kirill Tkhai
2018-08-09 10:37 ` Tetsuo Handa
2018-08-09 10:58 ` Kirill Tkhai
2018-08-09 11:23 ` Kirill Tkhai
2018-08-07 15:38 ` [PATCH RFC 03/10] mm: Convert shrinker_rwsem to mutex Kirill Tkhai
2018-08-07 15:38 ` [PATCH RFC 04/10] mm: Split unregister_shrinker() Kirill Tkhai
2018-08-07 15:38 ` [PATCH RFC 05/10] fs: Move list_lru_destroy() to destroy_super_work() Kirill Tkhai
2018-08-07 15:38 ` [PATCH RFC 06/10] fs: Shrink only (SB_ACTIVE|SB_BORN) superblocks in super_cache_scan() Kirill Tkhai
2018-08-07 15:38 ` [PATCH RFC 07/10] fs: Introduce struct super_operations::destroy_super() callback Kirill Tkhai
2018-08-07 15:39 ` [PATCH RFC 08/10] xfs: Introduce xfs_fs_destroy_super() Kirill Tkhai
2018-08-07 15:39 ` [PATCH RFC 09/10] shmem: Implement shmem_destroy_super() Kirill Tkhai
2018-08-07 15:39 ` [PATCH RFC 10/10] fs: Use unregister_shrinker_delayed_{initiate, finalize} for super_block shrinker Kirill Tkhai
2018-08-08 1:12 ` [PATCH RFC 00/10] Introduce lockless shrink_slab() Stephen Rothwell
2018-08-08 5:39 ` Shakeel Butt
2018-08-08 10:18 ` Kirill Tkhai [this message]
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