linux-kernel - Re: [PATCH v1 0/8] Cpumap improvements for large MAX_NR

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Message-ID: <20241206230358.GB5430@e132581.arm.com>
Date: Fri, 6 Dec 2024 23:03:58 +0000
From: Leo Yan <leo.yan@....com>
To: Ian Rogers <irogers@...gle.com>
Cc: Peter Zijlstra <peterz@...radead.org>, Ingo Molnar <mingo@...hat.com>,
	Arnaldo Carvalho de Melo <acme@...nel.org>,
	Namhyung Kim <namhyung@...nel.org>,
	Mark Rutland <mark.rutland@....com>,
	Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
	Jiri Olsa <jolsa@...nel.org>,
	Adrian Hunter <adrian.hunter@...el.com>,
	Kan Liang <kan.liang@...ux.intel.com>,
	James Clark <james.clark@...aro.org>,
	Kyle Meyer <kyle.meyer@....com>, Ben Gainey <ben.gainey@....com>,
	linux-perf-users@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v1 0/8] Cpumap improvements for large MAX_NR_CPUS

On Thu, Dec 05, 2024 at 08:40:27PM -0800, Ian Rogers wrote:
> 
> Prompted by Kyle Meyer's <kyle.meyer@....com> report of the
> MAX_NR_CPUS value being too small, initiate some clean up of its
> use. Kyle's patch is at the head of the series. The additional patches
> hide MAX_NR_CPUS as exposed from cpumap.h, reduce its use by removing
> perf_cpu_map__read, and try to better size the temporary CPU array in
> perf_cpu_map__new.

Reviewed-by: Leo Yan <leo.yan@....com>