linux-kernel - Re: [PATCH V3 0/5] bugs fix for large PEBS mmap read and rdpmc read

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Message-ID: <20180131035941.GW26209@tassilo.jf.intel.com>
Date:   Tue, 30 Jan 2018 19:59:41 -0800
From:   Andi Kleen <ak@...ux.intel.com>
To:     Stephane Eranian <eranian@...gle.com>
Cc:     Jiri Olsa <jolsa@...hat.com>,
        "Liang, Kan" <kan.liang@...ux.intel.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        LKML <linux-kernel@...r.kernel.org>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [PATCH V3 0/5] bugs fix for large PEBS mmap read and rdpmc read

> Still, the part I am missing here, is why asking for
> PERF_SAMPLE_PERIOD voids large PEBS.

I think it was disabled together with frequency mode
(which we could support too, but it's a bit more work)

But yes PERIOD could probably be allowed.


-Andi