linux-kernel - Re: [PATCH 0/3] VM throttling: avoid blocking occasional writers

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Date:	Tue, 03 Apr 2007 19:42:32 +0900
From:	Tomoki Sekiyama <tomoki.sekiyama.qu@...achi.com>
To:	Bill Davidsen <davidsen@....com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, yumiko.sugita.yf@...achi.com,
	masami.hiramatsu.pt@...achi.com, hidehiro.kawai.ez@...achi.com,
	yuji.kakutani.uw@...achi.com, soshima@...hat.com, haoki@...hat.com
Subject: Re: [PATCH 0/3] VM throttling: avoid blocking occasional writers

Hi,
Thanks for your comments.
I'm sorry for my late reply.

Bill Davidsen wrote:
>> Then, what do you think of the following idea?
>>
>> (4) add `dirty_start_writeback_ratio' as percentage of memory,
>>     at which a generator of dirty pages itself starts writeback
>>     (that is, non-blocking ratio).
>>
>> In this way, `dirty_ratio' is used as the blocking ratio, so we don't
>> need to modify the sysctl.conf etc. I think it's easier to understand
>> for administrators of systems, because the interface is similar as
>> `dirty_background_ratio' and`dirty_ratio.'
>>
> It sounds good to me, just be sure behavior is sane for for both
> blocking less than start_writeback and vice versa.

Then I'm going to post the new patchset.
In my new patchset, if dirty_ratio < dirty_start_writeback_ratio,
dirty_start_writeback_ratio is just regarded as the same value as
dirty_ratio, and then the kernel behaves similarly as the current kernel.

Regards,
-- 
Tomoki Sekiyama
Hitachi, Ltd., Systems Development Laboratory

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