Re: [CFT][RFC] HT scheduler

William Lee Irwin III
2003-12-11T15:38:45Z

William Lee Irwin III wrote:
>> Volano is all one process address space so it could be ->page_table_lock;
>> any chance you could find which spin_lock() call the pounded chunk of the
>> lock section jumps back to?

On Fri, Dec 12, 2003 at 02:30:27AM +1100, Nick Piggin wrote:
> OK its in futex_wait, up_read(&current->mm->mmap_sem) right after
> out_release_sem (line 517).
> So you get half points. Looks like its waiting on the bus rather than
> spinning on a lock. Or am I'm wrong?

There is a spinloop in __up_read(), which is probably it.

-- wli