linux-kernel - Re: [PATCH 2/2] perf/x86/amd: Add support for Large Increment per Cycle Events

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Message-ID: <f83eacb7-6346-6823-6429-27ee1d44f2df@amd.com>
Date:   Fri, 10 Jan 2020 10:22:10 -0600
From:   Kim Phillips <kim.phillips@....com>
To:     Peter Zijlstra <peterz@...radead.org>
Cc:     Ingo Molnar <mingo@...hat.com>, linux-kernel@...r.kernel.org,
        Janakarajan Natarajan <Janakarajan.Natarajan@....com>,
        Suravee Suthikulpanit <suravee.suthikulpanit@....com>,
        Tom Lendacky <thomas.lendacky@....com>,
        Stephane Eranian <eranian@...gle.com>,
        Martin Liška <mliska@...e.cz>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Jiri Olsa <jolsa@...hat.com>,
        Namhyung Kim <namhyung@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Borislav Petkov <bp@...en8.de>,
        "H. Peter Anvin" <hpa@...or.com>, x86@...nel.org
Subject: Re: [PATCH 2/2] perf/x86/amd: Add support for Large Increment per
 Cycle Events

On 1/10/20 9:09 AM, Peter Zijlstra wrote:
> On Wed, Jan 08, 2020 at 04:26:47PM -0600, Kim Phillips wrote:
>> On 12/20/19 6:09 AM, Peter Zijlstra wrote:
>>> On Thu, Nov 14, 2019 at 12:37:20PM -0600, Kim Phillips wrote:
>> One problem I see with your change in the "not already used" fastpath
>> area, is that the new mask variable gets updated with position 'i'
>> regardless of any previous Large Increment event assignments.
> 
> Urgh, I completely messed that up. Find the below delta (I'll push out a
> new version to queue.git as well).

OK, I tested what you pushed on your perf/amd branch, and it passes all my tests.

BTW, a large part of the commit message went missing, hopefully it'll be brought back before being pushed further upstream?

Thank you,

Kim