linux-kernel - Re: [PATCH v4 0/6] Micro-optimize vclock

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Message-ID: <20110516164939.GD25898@one.firstfloor.org>
Date:	Mon, 16 May 2011 18:49:39 +0200
From:	Andi Kleen <andi@...stfloor.org>
To:	Thomas Gleixner <tglx@...utronix.de>
Cc:	Andi Kleen <andi@...stfloor.org>, Andy Lutomirski <luto@....EDU>,
	x86@...nel.org, linux-kernel@...r.kernel.org,
	Ingo Molnar <mingo@...e.hu>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	"David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <eric.dumazet@...il.com>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Borislav Petkov <bp@...64.org>
Subject: Re: [PATCH v4 0/6] Micro-optimize vclock_gettime

> And unless you or someone else changes the primitive state of the
> kernel, framepointers are going to stay simply because removing them
> breaks profiling backtraces when the hit is inside vread().

This doesn't work anyways because the glibc stub code calling vgettimeofday
normally doesn't set up a frame pointer frame.

The only way to unwind there is dwarf2.

-Andi
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