linux-kernel - Re: [PATCH] perf, tools: Stop perf stat -p when profiled process exits v2

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Date:	Wed, 12 Sep 2012 08:54:18 -0600
From:	David Ahern <dsahern@...il.com>
To:	Andi Kleen <andi@...stfloor.org>
CC:	acme@...stprotocols.net, linux-kernel@...r.kernel.org,
	Andi Kleen <ak@...ux.intel.com>
Subject: Re: [PATCH] perf, tools: Stop perf stat -p when profiled process
 exits v2

On 9/12/12 8:40 AM, Andi Kleen wrote:
> -		while(!done) sleep(1);
> +		char piddir[40];
> +		if (target.pid && access("/proc", X_OK) == 0)
> +			snprintf(piddir, sizeof piddir, "/proc/%d", atoi(target.pid));

else path has piddir not set. Also as Namyhung pointed out target.pid 
can have multiple pids in it, so this fails if a user specified -p 
pid1,pid2 -- it will only check if the first process died.

Perhaps a more generic perf_target__is_alive function is needed that can 
check if the given tid(s) or pid(s) have terminated.

David
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