Messages in this thread |  | | Date | Wed, 25 Nov 2009 16:44:52 +0100 | | From | Ingo Molnar <> | | Subject | Re: [PATCH][GIT PULL][v2.6.32] tracing/x86: Add check to detect GCC messing with mcount prologue |
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* Thomas Gleixner <tglx@linutronix.de> wrote:
> On Tue, 24 Nov 2009, Jakub Jelinek wrote: > > > On Tue, Nov 24, 2009 at 03:55:49PM +0100, Thomas Gleixner wrote: > > > > you should compile your code with -maccumulate-outgoing-args, and there's > > > > no need to use -mtune=generic. Is that right? > > > > > > Seems to work. What other side effects has that ? > > > > Faster code, significant increase in code size though. Note that on many > > architectures it is the only supported model. > > Just checked on the affected -marchs. The increase in code size is > about 3% which is not that bad and definitely acceptable for the > tracing case. Will zap the -mtune=generic patch and use > -maccumulate-outgoing-args instead.
hm, 3% sounds quite large :( dyn-ftrace is enabled in distro configs, so 3% is a big deal IMO.
Ingo
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