From: Manfred Spraul <manfred@colorfullife.com>
To: Christoph Lameter <clameter@sgi.com>
Cc: linux-kernel@vger.kernel.org
Subject: Re: page fault fastpath: Increasing SMP scalability by introducing pte
Date: Mon, 16 Aug 2004 07:23:48 +0200 [thread overview]
Message-ID: <412044E4.4030409@colorfullife.com> (raw)
In-Reply-To: <Pine.LNX.4.58.0408151304190.2470@schroedinger.engr.sgi.com>
Christoph Lameter wrote:
>On Sun, 15 Aug 2004, Manfred Spraul wrote:
>
>
>
>>Very odd. Why do you see a problem with the page_table_lock but no
>>problem from the mmap semaphore?
>>
>>
>
>Because there is a only a down_read() call for the mmap semaphore before
>invoking handle_mm_fault. This is a rw semaphore which means that multiple
>processors/processes may be entering handle_mm_fault with a read lock on
>the mmap semaphore.
>
>
As far as I can see the actual hold times on the page_table_lock are not
that long and down_read() causes a cache line transfer, too.
But you have answered my question in your first mail: There are 2-5
spin_lock calls per page fault but only one down_read call.
--
Manfred
next prev parent reply other threads:[~2004-08-16 5:20 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-08-15 14:17 page fault fastpath: Increasing SMP scalability by introducing pte Manfred Spraul
2004-08-15 15:10 ` William Lee Irwin III
2004-08-15 19:36 ` Christoph Lameter
2004-08-15 20:06 ` Christoph Lameter
2004-08-16 5:23 ` Manfred Spraul [this message]
-- strict thread matches above, loose matches on Subject: below --
2004-08-15 13:50 Christoph Lameter
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