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

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Date:   Mon, 22 Jan 2018 13:10:31 +0800
From:   "Jin, Yao" <yao.jin@...ux.intel.com>
To:     Jiri Olsa <jolsa@...hat.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 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...

Thanks
Jin Yao