linux-kernel - Re: [PATCH 2/2] perf/x86/intel: Support PEBS output to PT

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Message-ID: <20190508091805.GC2606@hirez.programming.kicks-ass.net>
Date:   Wed, 8 May 2019 11:18:05 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     Alexander Shishkin <alexander.shishkin@...ux.intel.com>
Cc:     Arnaldo Carvalho de Melo <acme@...hat.com>,
        Ingo Molnar <mingo@...hat.com>, linux-kernel@...r.kernel.org,
        jolsa@...hat.com, adrian.hunter@...el.com
Subject: Re: [PATCH 2/2] perf/x86/intel: Support PEBS output to PT

On Thu, May 02, 2019 at 01:50:22PM +0300, Alexander Shishkin wrote:
> The output setting is per-CPU, so all PEBS events must be either writing
> to PT or to the DS area, so in order to not mess up the event scheduling,
> we fall back to the latter in case both types of events are scheduled in.

Urgh, that blows... I really don't like that.