linux-kernel - Re: [PATCH v3 0/8] Clean up libperf cpumap's empty function

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Date: Fri, 16 Feb 2024 17:04:01 -0800
From: Namhyung Kim <namhyung@...nel.org>
To: Ian Rogers <irogers@...gle.com>, Adrian Hunter <adrian.hunter@...el.com>, 
	James Clark <james.clark@....com>
Cc: Peter Zijlstra <peterz@...radead.org>, Ingo Molnar <mingo@...hat.com>, 
	Arnaldo Carvalho de Melo <acme@...nel.org>, Mark Rutland <mark.rutland@....com>, 
	Alexander Shishkin <alexander.shishkin@...ux.intel.com>, Jiri Olsa <jolsa@...nel.org>, 
	Suzuki K Poulose <suzuki.poulose@....com>, Mike Leach <mike.leach@...aro.org>, 
	John Garry <john.g.garry@...cle.com>, Will Deacon <will@...nel.org>, 
	Thomas Gleixner <tglx@...utronix.de>, Darren Hart <dvhart@...radead.org>, 
	Davidlohr Bueso <dave@...olabs.net>, André Almeida <andrealmeid@...lia.com>, 
	Kan Liang <kan.liang@...ux.intel.com>, K Prateek Nayak <kprateek.nayak@....com>, 
	Sean Christopherson <seanjc@...gle.com>, Paolo Bonzini <pbonzini@...hat.com>, 
	Kajol Jain <kjain@...ux.ibm.com>, Athira Rajeev <atrajeev@...ux.vnet.ibm.com>, 
	Andrew Jones <ajones@...tanamicro.com>, Alexandre Ghiti <alexghiti@...osinc.com>, 
	Atish Patra <atishp@...osinc.com>, "Steinar H. Gunderson" <sesse@...gle.com>, 
	Yang Jihong <yangjihong1@...wei.com>, Yang Li <yang.lee@...ux.alibaba.com>, 
	Changbin Du <changbin.du@...wei.com>, Sandipan Das <sandipan.das@....com>, 
	Ravi Bangoria <ravi.bangoria@....com>, Paran Lee <p4ranlee@...il.com>, 
	Nick Desaulniers <ndesaulniers@...gle.com>, Huacai Chen <chenhuacai@...nel.org>, 
	Yanteng Si <siyanteng@...ngson.cn>, linux-perf-users@...r.kernel.org, 
	linux-kernel@...r.kernel.org, coresight@...ts.linaro.org, 
	linux-arm-kernel@...ts.infradead.org, bpf@...r.kernel.org, 
	Leo Yan <leo.yan@...ux.dev>
Subject: Re: [PATCH v3 0/8] Clean up libperf cpumap's empty function

On Wed, Feb 14, 2024 at 2:03 PM Ian Rogers <irogers@...gle.com> wrote:
>
> On Fri, Feb 2, 2024 at 3:41 PM Ian Rogers <irogers@...gle.com> wrote:
> >
> > Rename and clean up the use of libperf CPU map functions particularly
> > focussing on perf_cpu_map__empty that may return true for maps
> > containing CPUs but also with an "any CPU"/dummy value.
> >
> > perf_cpu_map__nr is also troubling in that iterating an empty CPU map
> > will yield the "any CPU"/dummy value. Reduce the appearance of some
> > calls to this by using the perf_cpu_map__for_each_cpu macro.
> >
> > v3: Address handling of "any" is arm-spe/cs-etm patch.
> > v2: 6 patches were merged by Arnaldo. New patch added ensure empty
> >     maps are allocated as NULL (suggested by James Clark). Hopefully a
> >     fix to "perf arm-spe/cs-etm: Directly iterate CPU maps".
> >
> > Ian Rogers (8):
> >   libperf cpumap: Add any, empty and min helpers
> >   libperf cpumap: Ensure empty cpumap is NULL from alloc
> >   perf arm-spe/cs-etm: Directly iterate CPU maps
> >   perf intel-pt/intel-bts: Switch perf_cpu_map__has_any_cpu_or_is_empty
> >     use
> >   perf cpumap: Clean up use of perf_cpu_map__has_any_cpu_or_is_empty
> >   perf arm64 header: Remove unnecessary CPU map get and put
> >   perf stat: Remove duplicate cpus_map_matched function
> >   perf cpumap: Use perf_cpu_map__for_each_cpu when possible
>
> Ping. Thanks,
> Ian

Adrian and James, are you ok with this now?

Thanks,
Namhyung