linux-kernel - Re: [PATCH v3 7/8] perf: Define PMU_TXN

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Date:	Thu, 23 Jul 2015 18:17:43 -0700
From:	Sukadev Bhattiprolu <sukadev@...ux.vnet.ibm.com>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	Ingo Molnar <mingo@...hat.com>,
	Arnaldo Carvalho de Melo <acme@...nel.org>,
	Michael Ellerman <mpe@...erman.id.au>,
	linux-kernel@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org,
	linux-s390@...r.kernel.org, sparclinux@...r.kernel.org
Subject: Re: [PATCH v3 7/8] perf: Define PMU_TXN_READ interface

Peter Zijlstra [peterz@...radead.org] wrote:
| On Wed, Jul 22, 2015 at 04:19:16PM -0700, Sukadev Bhattiprolu wrote:
| > Peter Zijlstra [peterz@...radead.org] wrote:
| > | I've not woken up yet, and not actually fully read the email, but can
| > | you stuff the entire above chunk inside the IPI?
| > | 
| > | I think you could then actually optimize __perf_event_read() as well,
| > | because all these events should be on the same context, so no point in
| > | calling update_*time*() for every event or so.
| > | 
| > 
| > Do you mean something like this (will move the rename to a separate
| > patch before posting):
| 
| More like so.. please double check, I've not even had tea yet.

Yeah, I realized I had ignored the 'event->cpu' spec.
Will try this out. Thanks,

Sukadev

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