linux-kernel - Re: [PATCH V5 04/25] perf/x86/intel: Hybrid PMU support for perf capabilities

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Message-ID: <YG82scZuZAsxj2js@hirez.programming.kicks-ass.net>
Date:   Thu, 8 Apr 2021 19:00:33 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     kan.liang@...ux.intel.com
Cc:     mingo@...nel.org, linux-kernel@...r.kernel.org, acme@...nel.org,
        tglx@...utronix.de, bp@...en8.de, namhyung@...nel.org,
        jolsa@...hat.com, ak@...ux.intel.com, yao.jin@...ux.intel.com,
        alexander.shishkin@...ux.intel.com, adrian.hunter@...el.com,
        ricardo.neri-calderon@...ux.intel.com
Subject: Re: [PATCH V5 04/25] perf/x86/intel: Hybrid PMU support for perf
 capabilities

On Mon, Apr 05, 2021 at 08:10:46AM -0700, kan.liang@...ux.intel.com wrote:
> +#define is_hybrid()			(!!x86_pmu.num_hybrid_pmus)

Given this is sprinkled all over the place, can you make this a
static_key_false + static_branch_unlikely() such that the hybrid case is
out-of-line?