linux-kernel - Re: [Patch v2 10/24] perf/x86/intel: Process arch-PEBS records or record fragments

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Message-ID: <Z74rIURjU6cweJDo@tassilo>
Date: Tue, 25 Feb 2025 12:42:09 -0800
From: Andi Kleen <ak@...ux.intel.com>
To: Peter Zijlstra <peterz@...radead.org>
Cc: Dapeng Mi <dapeng1.mi@...ux.intel.com>, Ingo Molnar <mingo@...hat.com>,
	Arnaldo Carvalho de Melo <acme@...nel.org>,
	Namhyung Kim <namhyung@...nel.org>, Ian Rogers <irogers@...gle.com>,
	Adrian Hunter <adrian.hunter@...el.com>,
	Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
	Kan Liang <kan.liang@...ux.intel.com>,
	Eranian Stephane <eranian@...gle.com>, linux-kernel@...r.kernel.org,
	linux-perf-users@...r.kernel.org, Dapeng Mi <dapeng1.mi@...el.com>
Subject: Re: [Patch v2 10/24] perf/x86/intel: Process arch-PEBS records or
 record fragments

> >  
> > +	/*
> > +	 * Arch PEBS sets bit 54 in the global status register
> > +	 */
> > +	if (__test_and_clear_bit(GLOBAL_STATUS_ARCH_PEBS_THRESHOLD_BIT,
> > +				 (unsigned long *)&status)) {
> 
> Will arch_pebs hardware ever toggle bit 62?

No it won't.

-Andi