Messages in this thread | | | Subject | Re: [PATCH 00/10] jump label: introduce very_[un]likely + cleanups + docs | From | Steven Rostedt <> | Date | Wed, 22 Feb 2012 11:08:01 -0500 |
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On Wed, 2012-02-22 at 10:56 -0500, Jason Baron wrote: > On Wed, Feb 22, 2012 at 10:54:03AM -0500, Steven Rostedt wrote: > > On Wed, 2012-02-22 at 10:42 -0500, Jason Baron wrote: > > > > > Do you have 'CONFIG_CC_OPTIMIZE_FOR_SIZE' set? > > > > Yes I do :-p > > > > But that's because the distro config I started with had it set too. > > > > -- Steve > > > > > > Right, with CONFIG_CC_OPTIMIZE_FOR_SIZE unset, which is the default, at > least on x86, I have not seen a single case of the 'jmp;jmp'. >
What the config default is, is unimportant. It only maters to kernel hackers that build our own kernels. What's important is what distros do.
On debian testing I have in config-3.0.0-1-amd64:
CONFIG_CC_OPTIMIZE_FOR_SIZE=y
Although it is not set on the latest fedora 16 config.
Someone should tell debian to turn it off.
-- Steve
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