linux-kernel - Re: [tip:perf/core] perf/x86/intel: Disable userspace RDPMC usage for large PEBS

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Message-ID: <20180309174218.GB4064@hirez.programming.kicks-ass.net>
Date:   Fri, 9 Mar 2018 18:42:18 +0100
From:   Peter Zijlstra <peterz@...radead.org>
To:     Vince Weaver <vincent.weaver@...ne.edu>
Cc:     kan.liang@...ux.intel.com, linux-kernel@...r.kernel.org,
        tglx@...utronix.de, torvalds@...ux-foundation.org,
        eranian@...gle.com, acme@...hat.com, hpa@...or.com,
        alexander.shishkin@...ux.intel.com, mingo@...nel.org,
        jolsa@...hat.com, linux-tip-commits@...r.kernel.org
Subject: Re: [tip:perf/core] perf/x86/intel: Disable userspace RDPMC usage
 for large PEBS

On Fri, Mar 09, 2018 at 09:31:11AM -0500, Vince Weaver wrote:
> On Fri, 9 Mar 2018, tip-bot for Kan Liang wrote:
> 
> > Commit-ID:  1af22eba248efe2de25658041a80a3d40fb3e92e
> > Gitweb:     https://git.kernel.org/tip/1af22eba248efe2de25658041a80a3d40fb3e92e
> > Author:     Kan Liang <kan.liang@...ux.intel.com>
> > AuthorDate: Mon, 12 Feb 2018 14:20:35 -0800
> > Committer:  Ingo Molnar <mingo@...nel.org>
> > CommitDate: Fri, 9 Mar 2018 08:22:23 +0100
> > 
> > perf/x86/intel: Disable userspace RDPMC usage for large PEBS
> > 
> 
> 
> So this whole commit log is about disabling RDPMC usage for "large PEBS"
> but the actual change disables RDPMC if "PERF_X86_EVENT_FREERUNNING"
> 
> Either the commit log is really misleading, or else a poor name was chosen 
> for this feature.

Its the same thing, and yes that might want renaming I suppose.