linux-kernel - Re: [PATCH 1/4] x86/perf/intel: Introduce PMU flag for Extended PEBS

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Message-ID: <20180723151603.GC2458@hirez.programming.kicks-ass.net>
Date:   Mon, 23 Jul 2018 17:16:03 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     kan.liang@...ux.intel.com
Cc:     tglx@...utronix.de, mingo@...hat.com, linux-kernel@...r.kernel.org,
        acme@...nel.org, alexander.shishkin@...ux.intel.com,
        vincent.weaver@...ne.edu, jolsa@...hat.com, ak@...ux.intel.com
Subject: Re: [PATCH 1/4] x86/perf/intel: Introduce PMU flag for Extended PEBS

On Thu, Mar 08, 2018 at 06:15:39PM -0800, kan.liang@...ux.intel.com wrote:
> From: Kan Liang <kan.liang@...ux.intel.com>
> 
> The Extended PEBS feature, introduced in Goldmont Plus
> microarchitecture, supports all events as "Extended PEBS".
> 
> Introduce flag PMU_FL_PEBS_ALL to indicate the platforms which support
> extended PEBS.
> To support all events, it needs to support all constraints for PEBS. To
> avoid duplicating all the constraints in the PEBS table, making the PEBS
> code search the normal constraints too.
> 

So I like PEBS_ALL.. what I don't like is that it seems to be mutually
exclusive with PEBS Load Latency.

Took the patches.