linux-kernel - Re: [PATCH 2/2] blktrace: fix output of BLK_TC

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Date:	Sat, 11 Apr 2009 16:15:53 +0800
From:	Li Zefan <lizf@...fujitsu.com>
To:	Ingo Molnar <mingo@...e.hu>
CC:	Jens Axboe <jens.axboe@...cle.com>,
	Arnaldo Carvalho de Melo <acme@...hat.com>,
	Steven Rostedt <rostedt@...dmis.org>,
	Frederic Weisbecker <fweisbec@...il.com>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 2/2] blktrace: fix output of BLK_TC_PC events

Hi Ingo,

I would like to ask what's the status of these 2 patches.

Arnaldo acked on them.

Li Zefan wrote:
> BLK_TC_PC events should be treated differently with BLK_TC_FS events.
> 
> Before this patch:
> 
>  # echo 1 > /sys/block/sda/sda1/trace/enable
>  # echo pc > /sys/block/sda/sda1/trace/act_mask
>  # echo blk > /debugfs/tracing/current_tracer
>  # (generate some BLK_TC_PC events)
>  # cat trace
>         bash-2184  [000]  1774.275413:   8,7    I   N [bash]
>         bash-2184  [000]  1774.275435:   8,7    D   N [bash]
>         bash-2184  [000]  1774.275540:   8,7    I   R [bash]
>         bash-2184  [000]  1774.275547:   8,7    D   R [bash]
>  ksoftirqd/0-4     [000]  1774.275580:   8,7    C   N 0 [0]
>         bash-2184  [000]  1774.275648:   8,7    I   R [bash]
>         bash-2184  [000]  1774.275653:   8,7    D   R [bash]
>  ksoftirqd/0-4     [000]  1774.275682:   8,7    C   N 0 [0]
>         bash-2184  [000]  1774.275739:   8,7    I   R [bash]
>         bash-2184  [000]  1774.275744:   8,7    D   R [bash]
>  ksoftirqd/0-4     [000]  1774.275771:   8,7    C   N 0 [0]
>         bash-2184  [000]  1774.275804:   8,7    I   R [bash]
>         bash-2184  [000]  1774.275808:   8,7    D   R [bash]
>  ksoftirqd/0-4     [000]  1774.275836:   8,7    C   N 0 [0]
> 
> After this patch:
> 
>  # cat trace
>         bash-2263  [000]   366.782149:   8,7    I   N 0 (00 ..) [bash]
>         bash-2263  [000]   366.782323:   8,7    D   N 0 (00 ..) [bash]
>         bash-2263  [000]   366.782557:   8,7    I   R 8 (25 00 ..) [bash]
>         bash-2263  [000]   366.782560:   8,7    D   R 8 (25 00 ..) [bash]
>  ksoftirqd/0-4     [000]   366.782582:   8,7    C   N (25 00 ..) [0]
>         bash-2263  [000]   366.782648:   8,7    I   R 8 (5a 00 3f 00) [bash]
>         bash-2263  [000]   366.782650:   8,7    D   R 8 (5a 00 3f 00) [bash]
>  ksoftirqd/0-4     [000]   366.782669:   8,7    C   N (5a 00 3f 00) [0]
>         bash-2263  [000]   366.782710:   8,7    I   R 8 (5a 00 08 00) [bash]
>         bash-2263  [000]   366.782713:   8,7    D   R 8 (5a 00 08 00) [bash]
>  ksoftirqd/0-4     [000]   366.782730:   8,7    C   N (5a 00 08 00) [0]
>         bash-2263  [000]   366.783375:   8,7    I   R 36 (5a 00 08 00) [bash]
>         bash-2263  [000]   366.783379:   8,7    D   R 36 (5a 00 08 00) [bash]
>  ksoftirqd/0-4     [000]   366.783404:   8,7    C   N (5a 00 08 00) [0]
> 
> This is what we do with PC events in user-space blktrace.
> 
> Signed-off-by: Li Zefan <lizf@...fujitsu.com>
> ---
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