linux-kernel - Re: [PATCH] perf parse-events: Set exclude

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Date:   Wed, 12 Aug 2020 09:55:26 -0300
From:   Arnaldo Carvalho de Melo <acme@...nel.org>
To:     Jin Yao <yao.jin@...ux.intel.com>
Cc:     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,
        like.xu@...ux.intel.com
Subject: Re: [PATCH] perf parse-events: Set exclude_guest for user-space
 counting

Em Wed, Aug 12, 2020 at 09:15:04AM -0300, Arnaldo Carvalho de Melo escreveu:
> Em Wed, Aug 12, 2020 at 02:59:53PM +0800, Jin Yao escreveu:
> > Currently if we run 'perf record -e cycles:u', exclude_guest is 0.
> > 
> > But it doesn't make sense that we request for user-space counting
> > but we also get the guest report.
> > 
> > To keep perf semantics consistent and clear, this patch sets
> > exclude_guest for user-space counting.
> 
> Applied, and also added this, that you should consider doing in the
> future (modulo the "Committer testing:" header :) ):
> 
> Committer testing:
> 
> Before:
> 
>   # perf record -e cycles:u
>   ^C[ perf record: Woken up 1 times to write data ]
>   [ perf record: Captured and wrote 1.231 MB perf.data (91 samples) ]
>   #
>   # perf evlist -v
>   cycles:u: size: 120, { sample_period, sample_freq }: 4000, sample_type: IP|TID|TIME|ID|CPU|PERIOD, read_format: ID, disabled: 1, inherit: 1, exclude_kernel: 1, exclude_hv: 1, freq: 1, sample_id_all: 1
>   <SNIP>
>   #
> 
> After:
> 
>   # perf record -e cycles:u
>   ^C[ perf record: Woken up 1 times to write data ]
>   [ perf record: Captured and wrote 1.263 MB perf.data (403 samples) ]
>   #
>   # perf evlist -v
>   cycles:u: size: 120, { sample_period, sample_freq }: 4000, sample_type: IP|TID|TIME|ID|CPU|PERIOD, read_format: ID, disabled: 1, inherit: 1, exclude_kernel: 1, exclude_hv: 1, freq: 1, sample_id_all: 1, exclude_guest: 1
>   #

Also, please run 'perf test', as this will require changes to some
expected perf_event_attr setups:

[root@...co ~]# perf test "event definition"
 6: Parse event definition strings                        : FAILED!
[root@...co ~]#

- Arnaldo