linux-kernel - Re: [PATCH 2/2] perf/x86/amd: Don't allow pre-emption in amd_pmu_lbr

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Message-ID: <20231024222436.GG33965@noisy.programming.kicks-ass.net>
Date:   Wed, 25 Oct 2023 00:24:36 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     Mario Limonciello <mario.limonciello@....com>
Cc:     Ingo Molnar <mingo@...nel.org>, Borislav Petkov <bp@...en8.de>,
        Thomas Gleixner <tglx@...utronix.de>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        Sandipan Das <sandipan.das@....com>,
        "H . Peter Anvin" <hpa@...or.com>, linux-kernel@...r.kernel.org,
        x86@...nel.org, linux-pm@...r.kernel.org, rafael@...nel.org,
        pavel@....cz, linux-perf-users@...r.kernel.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>,
        Namhyung Kim <namhyung@...nel.org>,
        Ian Rogers <irogers@...gle.com>,
        Adrian Hunter <adrian.hunter@...el.com>
Subject: Re: [PATCH 2/2] perf/x86/amd: Don't allow pre-emption in
 amd_pmu_lbr_reset()

On Tue, Oct 24, 2023 at 01:30:59PM -0500, Mario Limonciello wrote:

> In that case - should preemption be disabled for all of x86_pmu_dying_cpu()
> perhaps?
> 
> For good measure x86_pmu_starting_cpu() too?

starting and dying are with IRQs disabled.