Re: [RFC] exit_thread() speedups in x86 process.c

[Andi Kleen]

Denis Vlasenko <vda@xxxxxxxxxxxxx> writes:
> 
> 80/20 rule says that 80% of code runs 20% of time,
> thus we need only __fast. Everything else will be by default __slow.
> (IOW: normal .text section is __slow, no need to add another one).

__slow could include noinline.  With unit-at-a-time gcc tends 
otherwise to inline too aggressively. With __fast that would not be
possible.


-Andi

P.S.: gcc 4.x already supports .cold even on the basic block level.
However I believe it's only active with profile feedback, which is not
practical for kernel builds.
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