linux-kernel - Re: [PATCH 12/12] perf report: Add --task option to display monitored tasks

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Date:   Tue, 9 Jan 2018 10:15:51 +0100
From:   Jiri Olsa <jolsa@...hat.com>
To:     Namhyung Kim <namhyung@...nel.org>
Cc:     Jiri Olsa <jolsa@...nel.org>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Peter Zijlstra <a.p.zijlstra@...llo.nl>,
        lkml <linux-kernel@...r.kernel.org>,
        Ingo Molnar <mingo@...nel.org>,
        David Ahern <dsahern@...il.com>,
        Andi Kleen <ak@...ux.intel.com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        kernel-team@....com
Subject: Re: [PATCH 12/12] perf report: Add --task option to display
 monitored tasks

On Tue, Jan 09, 2018 at 10:56:07AM +0900, Namhyung Kim wrote:

SNIP

> > +static struct task *task_list(struct task *task, struct machine *machine)
> > +{
> > +	struct thread *parent_thread, *thread = task->thread;
> > +	struct task   *parent_task;
> > +
> > +	/* Already listed. */
> > +	if (!list_empty(&task->list))
> > +		return NULL;
> > +
> > +	/* Last one in the chain. */
> > +	if (thread->ppid == -1)
> > +		return task;
> > +
> > +	parent_thread = machine__findnew_thread(machine, -1, thread->ppid);
> 
> I think it should be machine__find_thread() since creating a new
> thread at this stage would lack thread->priv anyway.

ugh, that's right.. I tried to stay safe, but the NULL
in priv would bring it down anyway

Arnaldo,
I already see changed version on top of your branch,
please let me know if you make also this change or
I should send v2

thanks,
jirka