From: Michal Hocko <mhocko@suse.com>
To: brookxu <brookxu.cn@gmail.com>
Cc: hannes@cmpxchg.org, vdavydov.dev@gmail.com,
akpm@linux-foundation.org, linux-kernel@vger.kernel.org,
cgroups@vger.kernel.org
Subject: Re: [PATCH 1/2] mem_cgroup: optimize the atomic count of wb_completion
Date: Fri, 24 Sep 2021 11:34:25 +0200 [thread overview]
Message-ID: <YU2boTZhfbo0h/Xi@dhcp22.suse.cz> (raw)
In-Reply-To: <1632465983-30525-1-git-send-email-brookxu.cn@gmail.com>
On Fri 24-09-21 14:46:22, brookxu wrote:
> From: Chunguang Xu <brookxu@tencent.com>
>
> In order to track inflight foreign writeback, we init
> wb_completion.cnt to 1. For normal writeback, this cause
> wb_wait_for_completion() to perform meaningless atomic
> operations. Since foreign writebacks rarely occur in most
> scenarios, we can init wb_completion.cnt to 0 and set
> frn.done.cnt to 1. In this way we can avoid unnecessary
> atomic operations.
Does this lead to any measurable differences?
--
Michal Hocko
SUSE Labs
next prev parent reply other threads:[~2021-09-24 9:34 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-09-24 6:46 brookxu
2021-09-24 6:46 ` [PATCH 2/2] mem_cgroup: introduce foreign_writeback_in_process() function brookxu
2021-09-24 9:34 ` Michal Hocko [this message]
2021-09-24 13:02 ` [PATCH 1/2] mem_cgroup: optimize the atomic count of wb_completion brookxu
2021-09-24 14:01 ` Michal Hocko
2021-09-24 15:21 ` brookxu.cn
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