From: ebiederm@xmission.com (Eric W. Biederman)
To: Steven Rostedt <rostedt@goodmis.org>
Cc: Andrew Morton <akpm@linux-foundation.org>,
linux-kernel@vger.kernel.org, mingo@elte.hu, fweisbec@gmail.com,
peterz@infradead.org, arjan@infradead.org,
dave@linux.vnet.ibm.com, containers@lists.osdl.org,
sukadev@linux.vnet.ibm.com, serue@us.ibm.com,
srostedt@redhat.com
Subject: Re: [PATCH 3/3] ftrace: trace single pid for function graph tracer
Date: Wed, 03 Dec 2008 15:36:29 -0800 [thread overview]
Message-ID: <m1y6yw25mq.fsf@frodo.ebiederm.org> (raw)
In-Reply-To: <alpine.DEB.1.10.0812031551360.29045@gandalf.stny.rr.com> (Steven Rostedt's message of "Wed, 3 Dec 2008 15:52:24 -0500 (EST)")
Steven Rostedt <rostedt@goodmis.org> writes:
>> > # echo $$ > /debugfs/tracing/set_ftrace_pid
>> > # echo function_graph > /debugfs/tracing/current_tracer
>> >
>> > Will cause only the current task to be traced. Note, the trace flags are
>> > also inherited by child processes, so the children of the shell
>> > will also be traced.
>>
>> Where did we end up on the pids-arent-unique issue? Gave up?
>
> Nah, patch 2 opens the door for a solution. I'm just pawning the work off
> to the container folks ;-)
The way patch 2 uses pids is just stupid. It has nothing to do with
pids aren't unique. You do a full walk of the process list instead
of using the hash table.
It makes me think that task->pid really should go away because with it
there people don't bother to look and see how things normally work.
Eric
next prev parent reply other threads:[~2008-12-03 23:46 UTC|newest]
Thread overview: 26+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-12-03 20:36 [PATCH 0/3] ftrace: updates for tip Steven Rostedt
2008-12-03 20:36 ` [PATCH 1/3] ftrace: graph of a single function Steven Rostedt
2008-12-03 21:07 ` Andrew Morton
2008-12-03 21:10 ` Steven Rostedt
2008-12-03 21:32 ` Andrew Morton
2008-12-03 21:36 ` Steven Rostedt
2008-12-04 8:39 ` Ingo Molnar
2008-12-03 21:08 ` Andrew Morton
2008-12-03 21:11 ` Steven Rostedt
2008-12-04 8:41 ` Ingo Molnar
2008-12-04 8:43 ` Peter Zijlstra
2008-12-15 9:21 ` Andy Whitcroft
2008-12-04 6:24 ` [PATCH 1/1] ftrace: avoid duplicated function when writing set_graph_function Liming Wang
2008-12-04 8:42 ` Ingo Molnar
2008-12-03 20:36 ` [PATCH 2/3] ftrace: use task struct trace flag to filter on pid Steven Rostedt
2008-12-03 22:34 ` Eric W. Biederman
2008-12-03 20:36 ` [PATCH 3/3] ftrace: trace single pid for function graph tracer Steven Rostedt
2008-12-03 20:49 ` Andrew Morton
2008-12-03 20:52 ` Steven Rostedt
2008-12-03 23:36 ` Eric W. Biederman [this message]
2008-12-04 2:29 ` Steven Rostedt
2008-12-04 4:22 ` Eric W. Biederman
2008-12-04 4:32 ` Steven Rostedt
2008-12-04 8:19 ` [PATCH 0/3] ftrace: updates for tip Ingo Molnar
2008-12-04 8:35 ` Ingo Molnar
2008-12-04 13:30 ` Steven Rostedt
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