linux-kernel - Re: [PATCH] tracing: fix the "old_pid" usage in trace_sched_process

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Message-ID: <20120330162930.GA4902@redhat.com>
Date:	Fri, 30 Mar 2012 18:29:30 +0200
From:	Oleg Nesterov <oleg@...hat.com>
To:	Ingo Molnar <mingo@...hat.com>
Cc:	David Smith <dsmith@...hat.com>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Steven Rostedt <rostedt@...dmis.org>,
	Denys Vlasenko <dvlasenk@...hat.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] tracing: fix the "old_pid" usage in
	trace_sched_process_exec()

On 03/30, Oleg Nesterov wrote:
>
> 1. TRACE_EVENT(sched_process_exec) forgets to actually use the
>    old pid argument, it sets ->old_pid = p->pid.
>
> 2. search_binary_handler() uses the wrong pid number. tracepoint
>    needs the global pid_t from the root namespace, while old_pid
>    is the virtual pid number as it seen by the tracer/parent.

Not really serious, but probably makes sense for 3.4. This fixes
the recently merged 4ff16c25e2cc48cbe6956e356c38a25ac063a64d
"tracepoint, vfs, sched: Add exec() tracepoint"

Oleg.

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