From: Benjamin Herrenschmidt <benh@kernel.crashing.org>
To: Ingo Molnar <mingo@elte.hu>
Cc: linux-rt-users@vger.kernel.org, linux-kernel@vger.kernel.org,
linuxppc-dev@ozlabs.org, Steven Rostedt <srostedt@redhat.com>,
Paul Mackerras <paulus@samba.org>,
Sam Ravnborg <sam@ravnborg.org>
Subject: Re: [PATCH 1/3] Makefile: Include arch Makefiles as late as possible
Date: Sun, 15 Feb 2009 11:19:56 +1100 [thread overview]
Message-ID: <1234657196.26036.86.camel@pasglop> (raw)
In-Reply-To: <20090214220326.GA5200@elte.hu>
On Sat, 2009-02-14 at 23:03 +0100, Ingo Molnar wrote:
>
> So the question is: even with FRAME_POINTERS disabled on PPC, is
> __builtin_return_address(1)/(2) reliable, and is save_stack_trace() fast? (i.e.
> can it walk down the stack frame efficiently, or does it have to scan the full
> kernel stack) I.e. does PPC have all the material advantages of frame pointers?
Yes, we do. We effectively have frame pointers in fact, they may only be
omitted in leaf functions but then gcc __builtin_return_address() knows
how to handle that afaik.
Cheers,
Ben.
next prev parent reply other threads:[~2009-02-15 0:20 UTC|newest]
Thread overview: 39+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-01-31 19:06 [PATCH] ftrace: On PowerPC we don't need frame pointers for CALLER_ADDRs Anton Vorontsov
2009-02-02 0:35 ` Benjamin Herrenschmidt
2009-02-02 14:04 ` Steven Rostedt
2009-02-03 14:56 ` [PATCH v2] " Anton Vorontsov
2009-02-03 16:06 ` Ingo Molnar
2009-02-03 16:19 ` Anton Vorontsov
2009-02-03 16:32 ` Steven Rostedt
2009-02-03 18:59 ` Anton Vorontsov
2009-02-04 0:34 ` Benjamin Herrenschmidt
2009-02-04 15:07 ` Anton Vorontsov
2009-02-04 15:08 ` [PATCH 1/3] Makefile: Include arch Makefiles as late as possible Anton Vorontsov
2009-02-04 21:26 ` Ingo Molnar
2009-02-11 3:51 ` Benjamin Herrenschmidt
2009-02-11 13:23 ` Ingo Molnar
2009-02-11 14:11 ` Steven Rostedt
2009-02-14 19:58 ` Sam Ravnborg
2009-02-14 19:57 ` Sam Ravnborg
2009-02-14 22:03 ` Ingo Molnar
2009-02-15 0:19 ` Benjamin Herrenschmidt [this message]
2009-02-15 8:09 ` Ingo Molnar
2009-02-16 14:20 ` Anton Vorontsov
2009-02-16 14:53 ` Anton Vorontsov
2009-02-16 20:04 ` Sam Ravnborg
2009-02-16 16:08 ` Anton Vorontsov
2009-02-16 17:22 ` Ingo Molnar
2009-02-04 15:08 ` [PATCH 2/3] powerpc: Make it possible to safely select CONFIG_FRAME_POINTER Anton Vorontsov
2009-02-05 0:31 ` Benjamin Herrenschmidt
2009-02-05 0:35 ` Steven Rostedt
2009-02-05 1:12 ` Anton Vorontsov
2009-02-05 1:15 ` Benjamin Herrenschmidt
2009-02-05 1:30 ` Anton Vorontsov
2009-02-05 15:45 ` Anton Vorontsov
2009-02-04 15:08 ` [PATCH 3/3] tracing: Tracers that use CALLER_ADDR macros should select FRAME_POINTER Anton Vorontsov
2009-02-04 15:26 ` Frédéric Weisbecker
2009-02-04 15:31 ` Steven Rostedt
2009-02-04 15:36 ` Anton Vorontsov
2009-02-04 16:50 ` Frédéric Weisbecker
2009-02-04 8:17 ` [PATCH v2] ftrace: On PowerPC we don't need frame pointers forCALLER_ADDRs Usha Rani Konudula
2009-02-04 8:37 ` Usha Rani Konudula
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