Re: [patch] speed up / fix the new generic semaphore code (fix AIM7 40% regression with 2.6.26-rc1)

[Andi Kleen]

Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx> writes:
>
> Well, it turns out that Ingo's fixed statistics actually put the real cost 
> in fcntl/ioctl/open/release:
>
>     310  down <= lock_kernel <= sys_fcntl <= system_call_after_swapgs <

That must be ->fasync? If it was file locks the lock_kernel would not
be inlined into sys_fcntl. Or is that an truncated back trace?

-Andi (wondering if he should plug ->fasync_unlocked again ...)
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