linux-kernel - Re: [PATCH] perf/core: introduce context per CPU event list

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Message-ID: <20161110083355.GO3568@worktop.programming.kicks-ass.net>
Date:   Thu, 10 Nov 2016 09:33:55 +0100
From:   Peter Zijlstra <peterz@...radead.org>
To:     kan.liang@...el.com
Cc:     mingo@...hat.com, linux-kernel@...r.kernel.org, acme@...nel.org,
        tglx@...utronix.de, alexander.shishkin@...ux.intel.com,
        vince@...ter.net, eranian@...gle.com, andi@...stfloor.org,
        Mark Rutland <mark.rutland@....com>
Subject: Re: [PATCH] perf/core: introduce context per CPU event list

Yes this is a problem, but no this cannot be done. We can't have per-cpu
storage per task. That rapidly explodes.

Mark is looking at replacing this stuff with an rb-tree for big-little,
that would also allow improving this I think.