linux-kernel - Re: [GIT PULL] ring-buffer: Replace this_cpu_*() with __this_cpu

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Message-ID: <alpine.DEB.2.11.1505191033540.27965@gentwo.org>
Date:	Tue, 19 May 2015 10:35:32 -0500 (CDT)
From:	Christoph Lameter <cl@...ux.com>
To:	Steven Rostedt <rostedt@...dmis.org>
cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Ingo Molnar <mingo@...nel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	stable <stable@...r.kernel.org>,
	Uwe Kleine-Koenig <u.kleine-koenig@...gutronix.de>
Subject: Re: [GIT PULL] ring-buffer: Replace this_cpu_*() with
 __this_cpu_*()

On Thu, 19 Mar 2015, Steven Rostedt wrote:

> On Thu, 19 Mar 2015 15:16:25 -0700
> Linus Torvalds <torvalds@...ux-foundation.org> wrote:
>
> > So I don't think the ring-buffer change is necessarily _wrong_, but if
> > this is a performance issue, why don't we just fix it up for the
> > generic case rather than for just one user?
>
> I totally agree with your analysis, but it's up to Christoph to come up
> with an answer to your questions.

Something beyond: Do not use this_cpu_* when preemption is already
off but use __this_cpu_*?

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