linux-kernel - Re: [PATCH] Optimize wait_sb

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Message-ID: <87hagjqdpi.fsf@devron.myhome.or.jp>
Date:	Fri, 28 Jun 2013 09:30:17 +0900
From:	OGAWA Hirofumi <hirofumi@...l.parknet.co.jp>
To:	"Theodore Ts'o" <tytso@....edu>
Cc:	Dave Chinner <david@...morbit.com>,
	Al Viro <viro@...iv.linux.org.uk>,
	linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org,
	tux3@...3.org
Subject: Re: [PATCH] Optimize wait_sb_inodes()

Theodore Ts'o <tytso@....edu> writes:

> On Fri, Jun 28, 2013 at 08:37:40AM +0900, OGAWA Hirofumi wrote:
>> 
>> Well, anyway, it is simple. This issue was came as the performance
>> regression when I was experimenting to use kernel bdi flusher from own
>> flusher. The issue was sync(2) like I said.  And this was just I
>> couldn't solve this issue by tux3 side unlike other optimizations.
>
> A performance regression using fsstress?  That's not a program
> intended to be a useful benchmark for measuring performance.

Right. fsstress is used as stress tool for me too as part of CI, with
background vmstat 1. Anyway, it is why I noticed this.

I agree it would not be high priority. But I don't think we should stop
to optimize it.

Thanks.
-- 
OGAWA Hirofumi <hirofumi@...l.parknet.co.jp>
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