linux-kernel - Re: [RFC] Full syscall argument decode in "perf trace"

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Message-ID: <5239A0BE.7050203@gmail.com>
Date:	Wed, 18 Sep 2013 06:46:54 -0600
From:	David Ahern <dsahern@...il.com>
To:	Denys Vlasenko <dvlasenk@...hat.com>
CC:	Arnaldo Carvalho de Melo <acme@...hat.com>,
	Tom Zanussi <tzanussi@...il.com>,
	Steven Rostedt <srostedt@...hat.com>,
	Ingo Molnar <mingo@...e.hu>, Jiri Olsa <jolsa@...hat.com>,
	Masami Hiramatsu <mhiramat@...hat.com>,
	Oleg Nesterov <oleg@...hat.com>, linux-kernel@...r.kernel.org,
	Denys Vlasenko <vda.linux@...glemail.com>
Subject: Re: [RFC] Full syscall argument decode in "perf trace"

On 9/18/13 5:35 AM, Denys Vlasenko wrote:
> Therefore my question should be restated as:
>
> Would perf developers accept the "syscall pausing" feature,
> or it won't be accepted?

I have been using perf-trace a lot lately specifically because it is 
effectively a 'passive' observer of the task (e.g., time-sensitive tasks 
can be traced with perf but not with strace).

Also, your solution would not work if the raw_syscall events are written 
to a file for later analysis where as using tracepoints to collect this 
information would.

David
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