From: Rik van Riel <riel@redhat.com>
To: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Gregory Haskins <gregory.haskins.ml@gmail.com>,
Nick Piggin <npiggin@suse.de>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
Andi Kleen <ak@suse.de>, Ingo Molnar <mingo@elte.hu>
Subject: Re: [patch 1/4] x86: FIFO ticket spinlocks
Date: Thu, 1 Nov 2007 20:35:26 -0400 [thread overview]
Message-ID: <20071101203526.293cd7f0@bree.surriel.com> (raw)
In-Reply-To: <alpine.LFD.0.999.0711010935060.3342@woody.linux-foundation.org>
On Thu, 1 Nov 2007 09:38:22 -0700 (PDT)
Linus Torvalds <torvalds@linux-foundation.org> wrote:
> So "unfair" is obviously always bad. Except when it isn't.
Larry Woodman managed to wedge the VM into a state where, on his
4x dual core system, only 2 cores (on the same CPU) could get the
zone->lru_lock overnight. The other 6 cores on the system were
just spinning, without being able to get the lock.
On the other hand, spinlock contention in the page replacement
code is just a symptom of the fact that we scan too many pages.
It can probably be fixed in other ways...
--
"Debugging is twice as hard as writing the code in the first place.
Therefore, if you write the code as cleverly as possible, you are,
by definition, not smart enough to debug it." - Brian W. Kernighan
next prev parent reply other threads:[~2007-11-02 0:35 UTC|newest]
Thread overview: 29+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-11-01 14:01 [patch 0/4] ticket spinlocks for x86 Nick Piggin
2007-11-01 14:02 ` [patch 1/4] spinlock: lockbreak cleanup Nick Piggin
2007-11-01 14:06 ` Peter Zijlstra
2007-11-01 14:29 ` Nick Piggin
2007-11-01 15:39 ` Lee Schermerhorn
2007-11-01 15:46 ` Ingo Molnar
2007-11-01 15:53 ` Nick Piggin
2007-11-01 14:03 ` [patch 1/4] x86: FIFO ticket spinlocks Nick Piggin
2007-11-01 14:40 ` Gregory Haskins
2007-11-01 16:38 ` Linus Torvalds
2007-11-02 0:35 ` Rik van Riel [this message]
2007-11-02 1:19 ` Linus Torvalds
2007-11-02 2:01 ` Rik van Riel
2007-11-02 6:42 ` Nick Piggin
2007-11-02 14:05 ` Rik van Riel
2007-11-02 22:37 ` Nick Piggin
2007-11-02 15:33 ` Ingo Molnar
2007-11-07 8:46 ` Nick Piggin
2007-11-02 14:24 ` Gregory Haskins
2007-11-01 20:01 ` Chuck Ebbert
2007-11-02 0:00 ` Nick Piggin
2007-11-02 16:22 ` Chuck Ebbert
2007-11-02 16:51 ` Linus Torvalds
2007-11-02 23:01 ` Nick Piggin
2007-11-03 0:56 ` Chuck Ebbert
2007-11-03 3:41 ` Nick Piggin
2007-11-01 14:04 ` [patch 3/4] x86: spinlock.h merge prep Nick Piggin
2007-11-01 14:05 ` [patch 4/4] x86: spinlock.h merge Nick Piggin
2007-11-03 22:36 ` [patch 0/4] ticket spinlocks for x86 Jeremy Fitzhardinge
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