linux-kernel - Re: [RFC][PATCH] perf: Rewrite enabled/running timekeeping

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Message-ID: <20170901123119.bbkdcpui3vh6zrvb@hirez.programming.kicks-ass.net>
Date:   Fri, 1 Sep 2017 14:31:19 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     Alexey Budankov <alexey.budankov@...ux.intel.com>
Cc:     Ingo Molnar <mingo@...hat.com>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Andi Kleen <ak@...ux.intel.com>,
        Kan Liang <kan.liang@...el.com>,
        Dmitri Prokhorov <Dmitry.Prohorov@...el.com>,
        Valery Cherepennikov <valery.cherepennikov@...el.com>,
        Mark Rutland <mark.rutland@....com>,
        Stephane Eranian <eranian@...gle.com>,
        David Carrillo-Cisneros <davidcc@...gle.com>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        Vince Weaver <vince@...ter.net>,
        Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [RFC][PATCH] perf: Rewrite enabled/running timekeeping

On Fri, Sep 01, 2017 at 01:45:17PM +0300, Alexey Budankov wrote:
> Well, this looks like an "opposite" approach to event timekeeping in 
> comparison to what we currently have. 

I would say 'sane' approach. The current thing is horrible.

> Do you want this rework before or after the current patch set?

Before I would think, because the whole point of the rb-tree thing is to
not touch all events all the time. And you can only do that after you
fix that timekeeping.