linux-kernel - Re: [PATCH] perf stat: Ignore error thread when enabling system-wide --per-thread

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Date:   Tue, 23 Jan 2018 15:19:45 +0100
From:   Jiri Olsa <jolsa@...hat.com>
To:     "Jin, Yao" <yao.jin@...ux.intel.com>
Cc:     acme@...nel.org, jolsa@...nel.org, peterz@...radead.org,
        mingo@...hat.com, alexander.shishkin@...ux.intel.com,
        Linux-kernel@...r.kernel.org, ak@...ux.intel.com,
        kan.liang@...el.com, yao.jin@...el.com
Subject: Re: [PATCH] perf stat: Ignore error thread when enabling system-wide
 --per-thread

On Mon, Jan 22, 2018 at 01:10:31PM +0800, Jin, Yao wrote:
> 
> 
> On 1/16/2018 9:17 PM, Jiri Olsa wrote:
> > On Tue, Jan 16, 2018 at 09:06:09PM +0800, Jin, Yao wrote:
> > > Just tested. But looks it's not OK for '--per-thread' case.
> > 
> > yea, I haven't tested much.. might need soem tweaking,
> > but my point was that it could be doable on one place
> > instead of introducing another if possible
> > 
> > jirka
> > 
> 
> Hi Jiri,
> 
> I ever considered to move the operation of removing error thread to
> perf_evsel__fallback(). The perf_evsel__fallback() is common code and it's
> shared by perf report, perf stat and perf top.
> 
> While finally I think it'd better let the caller decide to remove error
> thread and try again, or just return the warning message.
> perf_evsel__fallback() probably doesn't know what the caller want to do.
> 
> That's my current thinking. Maybe there will be a better fix...

ok, can't think of better fix atm.. looks good ;-)

Acked-by: Jiri Olsa <jolsa@...nel.org>

thanks,
jirka