linux-kernel - Re: [PATCH v2 3/3] X86: Add a thread cpu time implementation to vDSO

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Message-ID: <20141219172728.GN30905@twins.programming.kicks-ass.net>
Date:	Fri, 19 Dec 2014 18:27:28 +0100
From:	Peter Zijlstra <peterz@...radead.org>
To:	Andy Lutomirski <luto@...capital.net>
Cc:	Shaohua Li <shli@...com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	X86 ML <x86@...nel.org>, Kernel-team@...com,
	"H. Peter Anvin" <hpa@...or.com>, Ingo Molnar <mingo@...hat.com>,
	John Stultz <john.stultz@...aro.org>
Subject: Re: [PATCH v2 3/3] X86: Add a thread cpu time implementation to vDSO

On Fri, Dec 19, 2014 at 09:07:49AM -0800, Andy Lutomirski wrote:
> Re-asking my old question: would it make sense to add a vdso helper
> for the magic self-monitoring interface?  Or, at the very least, we
> could try to tidy up the docs a bit.

I find it really helps (performance wise) to strip down that magic to
the bare minimum required.

A VDSO helper would always have to do everything.  I suppose we could
provide a generic helper, one can always hand code the stuff anyhow.

Then again, what is the benefit of having it in the VDSO as opposed to a
regular DSO?

Updating the docs is always good.
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