linux-kernel - Re: [PATCH]cfq-iosched: don't take requests with long distence as close

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Message-ID: <x49zl4fnmhz.fsf@segfault.boston.devel.redhat.com>
Date:	Fri, 15 Jan 2010 15:26:00 -0500
From:	Jeff Moyer <jmoyer@...hat.com>
To:	Corrado Zoccolo <czoccolo@...il.com>
Cc:	"Zhang\, Yanmin" <yanmin_zhang@...ux.intel.com>,
	Shaohua Li <shaohua.li@...el.com>,
	"linux-kernel\@vger.kernel.org" <linux-kernel@...r.kernel.org>,
	"jens.axboe\@oracle.com" <jens.axboe@...cle.com>,
	"Zhang\, Yanmin" <yanmin.zhang@...el.com>
Subject: Re: [PATCH]cfq-iosched: don't take requests with long distence as  close

Corrado Zoccolo <czoccolo@...il.com> writes:

> On Fri, Jan 15, 2010 at 8:45 PM, Jeff Moyer <jmoyer@...hat.com> wrote:
>> Corrado Zoccolo <czoccolo@...il.com> writes:
>>
>>> Hi Jeff,
>>> I think this patch has the same flaw as Shaohua's.
>>> The seekiness check that you introduce in cfq_rq_close is already
>>> present in its caller, cfq_close_cooperator, so it is not effective.
>>
>> I don't think so.  There are two queues, here.  One queue is checked by
>> the caller, and that is the cur_cfqq.  The __cfqq needs to also be
>> checked.
> The other one, i.e. the returned one, is also checked by the caller,
> some lines below.

haha.  OK, I guess I wrote it right the first time?  ;-)

-Jeff
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