linux-kernel - Re: [PATCH v1] perf sample: Make user_regs and intr

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Message-Id: <173946729207.1291083.11530749886771499675.b4-ty@kernel.org>
Date: Thu, 13 Feb 2025 09:21:32 -0800
From: Namhyung Kim <namhyung@...nel.org>
To: Tavian Barnes <tavianator@...ianator.com>, 
 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>, Adrian Hunter <adrian.hunter@...el.com>, 
 Kan Liang <kan.liang@...ux.intel.com>, John Garry <john.g.garry@...cle.com>, 
 James Clark <james.clark@...aro.org>, Leo Yan <leo.yan@...ux.dev>, 
 Charlie Jenkins <charlie@...osinc.com>, Andi Kleen <ak@...ux.intel.com>, 
 Veronika Molnarova <vmolnaro@...hat.com>, 
 Michael Petlan <mpetlan@...hat.com>, linux-kernel@...r.kernel.org, 
 linux-perf-users@...r.kernel.org, linux-arm-kernel@...ts.infradead.org, 
 coresight@...ts.linaro.org, Ian Rogers <irogers@...gle.com>
Subject: Re: [PATCH v1] perf sample: Make user_regs and intr_regs optional

On Mon, 13 Jan 2025 11:43:45 -0800, Ian Rogers wrote:
> The struct dump_regs contains 512 bytes of cache_regs, meaning the two
> values in perf_sample contribute 1088 bytes of its total 1384 bytes
> size. Initializing this much memory has a cost reported by Tavian
> Barnes <tavianator@...ianator.com> as about 2.5% when running `perf
> script --itrace=i0`:
> https://lore.kernel.org/lkml/d841b97b3ad2ca8bcab07e4293375fb7c32dfce7.1736618095.git.tavianator@tavianator.com/
> 
> [...]
Applied to perf-tools-next, thanks!

Best regards,
Namhyung