linux-kernel - Re: [PATCH 06/15] cfq-iosched: Print sync-noidle information in blktrace messages

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Message-ID: <x49626tj4a4.fsf@segfault.boston.devel.redhat.com>
Date:	Mon, 01 Oct 2012 17:01:07 -0400
From:	Jeff Moyer <jmoyer@...hat.com>
To:	Vivek Goyal <vgoyal@...hat.com>
Cc:	linux-kernel@...r.kernel.org, axboe@...nel.dk, tj@...nel.org,
	cgroups@...r.kernel.org
Subject: Re: [PATCH 06/15] cfq-iosched: Print sync-noidle information in blktrace messages

Vivek Goyal <vgoyal@...hat.com> writes:

> Currently we attach a character "S" or "A" to the cfqq<pid>, to represent
> whether queues is sync or async. Add one more character "N" to represent
> whether it is sync-noidle queue or sync queue. So now three different
> type of queues will look as follows.
>
> cfq1234S   --> sync queus
> cfq1234SN  --> sync noidle queue
> cfq1234A   --> Async queue
>
> Previously S/A classification was being printed only if group scheduling
> was enabled. This patch also makes sure that this classification is
> displayed even if group idling is disabled.
>
> Signed-off-by: Vivek Goyal <vgoyal@...hat.com>

I'm assuming nobody relies on the contents of trace_message output not
changing in blktrace output.

Acked-by: Jeff Moyer <jmoyer@...hat.com>
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