linux-kernel - Re: [PATCH 5/5] blktrace: print human-readable act

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Date:	Tue, 24 Mar 2009 16:46:23 +0800
From:	Li Zefan <lizf@...fujitsu.com>
To:	Ingo Molnar <mingo@...e.hu>
CC:	Jens Axboe <jens.axboe@...cle.com>,
	Steven Rostedt <rostedt@...dmis.org>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Arnaldo Carvalho de Melo <acme@...hat.com>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 5/5] blktrace: print human-readable act_mask

Ingo Molnar wrote:
> * Li Zefan <lizf@...fujitsu.com> wrote:
> 
>> Print stringified act_mask instead of hex value:
>>  # cat act_mask
>>  read,write,barrier,sync,queue,requeue,issue,complete,fs,pc,ahead,meta,
>>  discard,drv_data
>>  # echo "meta,write" > act_mask
>>  # cat act_mask
>>  write,meta
> 
> btw., does user-space blktrace make use of this facility?
> 

This facility can be used when we are using ftrace blktrace.

The userspace blktrace gets the filter-list via [-A hex-mask] and [-a str-mask].

like: blktrace -d /dev/sda -a write -a meta
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