linux-kernel - Re: [PATCH] perf tools: ignore zombie process for user profile

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Date:   Wed, 14 Dec 2016 16:13:20 -0300
From:   "acme@...nel.org" <acme@...nel.org>
To:     "Liang, Kan" <kan.liang@...el.com>
Cc:     Jiri Olsa <jolsa@...hat.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "mingo@...hat.com" <mingo@...hat.com>,
        "peterz@...radead.org" <peterz@...radead.org>,
        "jolsa@...nel.org" <jolsa@...nel.org>,
        "Hunter, Adrian" <adrian.hunter@...el.com>,
        "andi@...stfloor.org" <andi@...stfloor.org>
Subject: Re: [PATCH] perf tools: ignore zombie process for user profile

Em Wed, Dec 14, 2016 at 06:26:02PM +0000, Liang, Kan escreveu:
> > On Wed, Dec 14, 2016 at 12:48:05PM -0500, kan.liang@...el.com wrote:
> > > From: Kan Liang <kan.liang@...el.com>
> > > Zombie process is dead process. It is meaningless to profile it.
> > > It's better to ignore it for user profile.

> > I recently posted different patch for same issue:
> >   http://marc.info/?l=linux-kernel&m=148153895827359&w=2
 
> The change as below make me confuse.
> +	/* The system wide setup does not work with threads. */
> +	if (!evsel->system_wide)
> +		return false;
> It looks the meaning of the comments is inconsistent with the code.
 
> Your original patch doesn't work well with the issue.
> But if I change the above code as below, the issue is fixed.
> 	if (evsel->system_wide)
> 		return false;

yeah, Namhyung noticed that, Jiri sent a fixed patch, I have it already
in my perf/core branch.

- Arnaldo