Re: [PATCH] x86 rwsem optimization extreme

Andi Kleen
2010-02-18T09:29:17Z

On Wed, Feb 17, 2010 at 10:24:58PM -1000, Zachary Amsden wrote:
>>
>> Zachary Amsden<zamsden@redhat.com> writes
>>> Incidentally, the cost of putting all the rwsem code inline, using the
>>> straightforward approach, for git-tip, using defconfig on x86_64 is
>>> 3565 bytes / 20971778 bytes total, or 0.0168%, using gcc 4.4.3.
>>>
>> The nice advantage of putting lock code inline is that it gets
>> accounted to the caller in all profilers.
>>
>> -Andi
>>
>>
>
> Unfortunately, only for the uncontended case. The hot case still ends up
> in a call to the lock text section.

I removed those some time ago because it breaks unwinding.
Did that get undone?

-Andi
--
ak@linux.intel.com -- Speaking for myself only.