linux-kernel - Re: [PATCH v4 0/3] perf tool: Enable cpu list for hybrid

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Date:   Tue, 10 Aug 2021 08:36:42 +0800
From:   "Jin, Yao" <yao.jin@...ux.intel.com>
To:     acme@...nel.org, jolsa@...nel.org, peterz@...radead.org,
        mingo@...hat.com, alexander.shishkin@...ux.intel.com
Cc:     Linux-kernel@...r.kernel.org, linux-perf-users@...r.kernel.org,
        ak@...ux.intel.com, kan.liang@...el.com, yao.jin@...el.com
Subject: Re: [PATCH v4 0/3] perf tool: Enable cpu list for hybrid

Hi Jiri,

Any comments for v4 series?

Thanks
Jin Yao

On 7/23/2021 2:34 PM, Jin Yao wrote:
> The perf-record and perf-stat have supported the option '-C/--cpus'
> to count or collect only on the list of CPUs provided. This option
> needs to be supported for hybrid as well.
> 
> v4:
> ---
> Rename evlist__use_cpu_list to evlist__fix_hybrid_cpus
> Add comments to evlist__fix_hybrid_cpus.
> 
> v3:
> ---
> Rebase to latest perf/core branch.
> 
> v2:
> ---
> Automatically map to hybrid pmu.
> 
> For example,
> 
> If cpu0-7 are 'cpu_core' and cpu9-11 are 'cpu_atom',
> 
>    # perf stat -e cycles -C0,11 -- sleep 1
>    WARNING: use 0 in 'cpu_core' for 'cycles', skip other cpus in list.
>    WARNING: use 11 in 'cpu_atom' for 'cycles', skip other cpus in list.
> 
>     Performance counter stats for 'CPU(s) 0,11':
> 
>             1,914,704      cpu_core/cycles/
>             2,036,983      cpu_atom/cycles/
> 
>           1.005815641 seconds time elapsed
> 
> It automatically selects cpu0 for cpu_core/cycles/, selects cpu11 for
> cpu_atom/cycles/, also with some warnings output.
> 
> Jin Yao (3):
>    libperf: Add perf_cpu_map__default_new()
>    perf tools: Create hybrid flag in target
>    perf tools: Enable on a list of CPUs for hybrid
> 
>   tools/lib/perf/cpumap.c              |  5 ++
>   tools/lib/perf/include/perf/cpumap.h |  1 +
>   tools/perf/builtin-record.c          |  7 +++
>   tools/perf/builtin-stat.c            |  6 +++
>   tools/perf/util/evlist-hybrid.c      | 73 ++++++++++++++++++++++++++++
>   tools/perf/util/evlist-hybrid.h      |  1 +
>   tools/perf/util/evlist.c             |  3 +-
>   tools/perf/util/pmu.c                | 35 +++++++++++++
>   tools/perf/util/pmu.h                |  4 ++
>   tools/perf/util/target.h             |  1 +
>   10 files changed, 135 insertions(+), 1 deletion(-)
>