linux-kernel - Re: [RFC/PATCH 4/4] perf/x86: Relax privilege filter restriction on AMD IBS

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Message-ID: <20240904113908.GG4723@noisy.programming.kicks-ass.net>
Date: Wed, 4 Sep 2024 13:39:08 +0200
From: Peter Zijlstra <peterz@...radead.org>
To: Namhyung Kim <namhyung@...nel.org>
Cc: Ingo Molnar <mingo@...nel.org>, Kan Liang <kan.liang@...ux.intel.com>,
	Mark Rutland <mark.rutland@....com>,
	Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
	Arnaldo Carvalho de Melo <acme@...nel.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Stephane Eranian <eranian@...gle.com>,
	Ravi Bangoria <ravi.bangoria@....com>
Subject: Re: [RFC/PATCH 4/4] perf/x86: Relax privilege filter restriction on
 AMD IBS

On Tue, Sep 03, 2024 at 09:34:58AM -0700, Namhyung Kim wrote:

> > While the IBS thing only sucks when you use exclude_[user,kernel]
> > things. Stealth suckage is bad and enrages people.
> 
> Right, let's make it explicit like the above.

Given Ravi's concern, perhaps a whole second PMU instance 'ibs_swfilt'
or so? Might have more problems than its worth though, but perhaps
something worth exploring for a bit.