linux-kernel - Re: [PATCH 11/22] perf/core: Support a REMOVE transaction

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Message-ID: <20190319152903.GJ5996@hirez.programming.kicks-ass.net>
Date:   Tue, 19 Mar 2019 16:29:03 +0100
From:   Peter Zijlstra <peterz@...radead.org>
To:     kan.liang@...ux.intel.com
Cc:     acme@...nel.org, mingo@...hat.com, linux-kernel@...r.kernel.org,
        tglx@...utronix.de, jolsa@...nel.org, eranian@...gle.com,
        alexander.shishkin@...ux.intel.com, ak@...ux.intel.com
Subject: Re: [PATCH 11/22] perf/core: Support a REMOVE transaction

On Mon, Mar 18, 2019 at 02:41:33PM -0700, kan.liang@...ux.intel.com wrote:
> From: Andi Kleen <ak@...ux.intel.com>
> 
> For TopDown metrics it is useful to have a remove transaction when
> the counter is unscheduled, so that the value can be saved correctly.
> Add a remove transaction to the perf core.

That needs more explaining.