From: Andrew Morton <akpm@osdl.org>
To: Zwane Mwaikambo <zwane@fsmlabs.com>
Cc: torvalds@osdl.org, paulus@samba.org,
linux-kernel@vger.kernel.org, anton@samba.org,
jun.nakajima@intel.com, ak@suse.de, mingo@elte.hu
Subject: Re: [PATCH] Yielding processor resources during lock contention
Date: Sat, 11 Sep 2004 22:00:03 -0700 [thread overview]
Message-ID: <20040911220003.0e9061ad.akpm@osdl.org> (raw)
In-Reply-To: <Pine.LNX.4.53.0409120009510.2297@montezuma.fsmlabs.com>
Zwane Mwaikambo <zwane@fsmlabs.com> wrote:
>
> The following patch introduces cpu_lock_yield which allows architectures
> to possibly yield processor resources during lock contention.
err.. Haven't you just invented a really sucky semaphore?
> The original
> requirement stems from Paul's requirement on PPC64 LPAR systems to yield
> the processor to the hypervisor instead of spinning.
Maybe Paul needs to use a semaphore.
Now, maybe Paul has tied himself into sufficiently tangly locking knots
that in some circumstances he needs to spin on the lock and cannot schedule
away. But he can still use a semaphore and spin on down_trylock.
Confused by all of this.
next prev parent reply other threads:[~2004-09-12 5:03 UTC|newest]
Thread overview: 50+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-09-03 0:02 [PATCH][5/8] Arch agnostic completely out of line locks / ppc64 Zwane Mwaikambo
2004-09-09 5:42 ` Paul Mackerras
2004-09-09 12:41 ` Zwane Mwaikambo
2004-09-09 14:54 ` Linus Torvalds
2004-09-09 14:55 ` Linus Torvalds
2004-09-09 15:32 ` Zwane Mwaikambo
2004-09-12 4:59 ` [PATCH] Yielding processor resources during lock contention Zwane Mwaikambo
2004-09-12 5:00 ` Andrew Morton [this message]
2004-09-12 5:10 ` Anton Blanchard
2004-09-12 5:13 ` Zwane Mwaikambo
2004-09-12 4:32 ` Nick Piggin
2004-09-12 5:33 ` Zwane Mwaikambo
2004-09-12 4:46 ` Nick Piggin
2004-09-12 5:51 ` Zwane Mwaikambo
2004-09-12 5:02 ` Nick Piggin
2004-09-12 6:09 ` Anton Blanchard
2004-09-12 6:58 ` William Lee Irwin III
2004-09-12 5:18 ` Andrew Morton
2004-09-12 5:10 ` Linus Torvalds
2004-09-12 5:27 ` Zwane Mwaikambo
2004-09-13 12:21 ` [PATCH] Yielding processor resources during lock contention #2 Zwane Mwaikambo
2004-09-12 7:49 ` [PATCH] Yielding processor resources during lock contention Ingo Molnar
2004-09-12 16:10 ` Zwane Mwaikambo
2004-09-12 19:34 ` Ingo Molnar
2004-09-12 10:10 ` Arnd Bergmann
2004-09-12 10:43 ` Anton Blanchard
2004-09-12 11:12 ` Arnd Bergmann
2004-09-09 15:43 ` [PATCH][5/8] Arch agnostic completely out of line locks / ppc64 Anton Blanchard
2004-09-09 17:19 ` William Lee Irwin III
2004-09-09 21:38 ` Paul Mackerras
2004-09-09 22:00 ` William Lee Irwin III
2004-09-09 23:36 ` Paul Mackerras
2004-09-10 0:09 ` William Lee Irwin III
2004-09-10 0:21 ` Linus Torvalds
2004-09-10 0:35 ` Anton Blanchard
2004-09-10 0:54 ` Linus Torvalds
2004-09-10 1:42 ` Anton Blanchard
2004-09-10 1:50 ` Anton Blanchard
2004-09-10 2:22 ` William Lee Irwin III
2004-09-10 2:32 ` William Lee Irwin III
2004-09-10 2:37 ` William Lee Irwin III
2004-09-10 3:24 ` Anton Blanchard
2004-09-10 7:40 ` Ingo Molnar
2004-09-10 12:16 ` William Lee Irwin III
2004-09-10 12:22 ` Ingo Molnar
2004-09-10 3:23 ` Anton Blanchard
2004-09-10 7:56 ` Anton Blanchard
-- strict thread matches above, loose matches on Subject: below --
2004-09-13 0:45 [PATCH] Yielding processor resources during lock contention Nakajima, Jun
2004-09-13 1:35 Nakajima, Jun
2004-09-13 6:35 ` Ingo Molnar
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