From: Andi Kleen <andi@firstfloor.org>
To: Thomas Gleixner <tglx@linutronix.de>
Cc: Andi Kleen <andi@firstfloor.org>, Andy Lutomirski <luto@MIT.EDU>,
x86@kernel.org, linux-kernel@vger.kernel.org,
Ingo Molnar <mingo@elte.hu>,
Linus Torvalds <torvalds@linux-foundation.org>,
"David S. Miller" <davem@davemloft.net>,
Eric Dumazet <eric.dumazet@gmail.com>,
Peter Zijlstra <a.p.zijlstra@chello.nl>,
Borislav Petkov <bp@amd64.org>
Subject: Re: [PATCH v4 0/6] Micro-optimize vclock_gettime
Date: Mon, 16 May 2011 18:49:39 +0200 [thread overview]
Message-ID: <20110516164939.GD25898@one.firstfloor.org> (raw)
In-Reply-To: <alpine.LFD.2.02.1105161817120.3078@ionos>
> 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
next prev parent reply other threads:[~2011-05-16 16:49 UTC|newest]
Thread overview: 31+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-05-16 16:00 [PATCH v4 0/6] Micro-optimize vclock_gettime Andy Lutomirski
2011-05-16 16:00 ` [PATCH v4 1/6] x86-64: Clean up vdso/kernel shared variables Andy Lutomirski
2011-05-16 17:23 ` Borislav Petkov
2011-05-16 17:34 ` Andrew Lutomirski
2011-05-16 16:00 ` [PATCH v4 2/6] x86-64: Remove unnecessary barrier in vread_tsc Andy Lutomirski
2011-05-16 16:01 ` [PATCH v4 3/6] x86-64: Don't generate cmov " Andy Lutomirski
2011-05-16 16:01 ` [PATCH v4 4/6] x86-64: vclock_gettime(CLOCK_MONOTONIC) can't ever see nsec < 0 Andy Lutomirski
2011-05-16 16:01 ` [PATCH v4 5/6] x86-64: Move vread_tsc into a new file with sensible options Andy Lutomirski
2011-05-16 16:01 ` [PATCH v4 6/6] x86-64: Turn off -pg and turn on -foptimize-sibling-calls for vDSO Andy Lutomirski
2011-05-16 16:09 ` [PATCH v4 0/6] Micro-optimize vclock_gettime Andi Kleen
2011-05-16 16:25 ` Thomas Gleixner
2011-05-16 16:49 ` Andi Kleen [this message]
2011-05-16 17:05 ` Andrew Lutomirski
2011-05-16 20:22 ` Andi Kleen
2011-05-16 21:28 ` Andrew Lutomirski
2011-05-16 21:53 ` Thomas Gleixner
2011-05-16 22:17 ` Andrew Lutomirski
2011-05-16 22:40 ` Thomas Gleixner
2011-05-17 8:00 ` Ingo Molnar
2011-05-17 11:11 ` Andrew Lutomirski
2011-05-17 11:36 ` Ingo Molnar
2011-05-17 18:31 ` Andy Lutomirski
2011-05-17 19:27 ` Ingo Molnar
2011-05-17 21:31 ` Andi Kleen
2011-05-17 22:59 ` Thomas Gleixner
2011-05-18 3:18 ` Andrew Lutomirski
2011-05-18 7:30 ` Thomas Gleixner
2011-05-18 8:31 ` Ingo Molnar
2011-05-18 11:30 ` Andrew Lutomirski
2011-05-18 12:10 ` Ingo Molnar
2011-05-17 7:56 ` Ingo Molnar
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