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Date: Thu, 11 Dec 2003 07:38:38 -0800
From: William Lee Irwin III <wli@holomorphy.com>
To: Nick Piggin <piggin@cyberone.com.au>
Cc: linux-kernel <linux-kernel@vger.kernel.org>,
       Ingo Molnar <mingo@redhat.com>, Rusty Russell <rusty@rustcorp.com.au>,
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       "Nakajima, Jun" <jun.nakajima@intel.com>, Mark Wong <markw@osdl.org>
Subject: Re: [CFT][RFC] HT scheduler
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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