From: Arjan van de Ven <arjanv@redhat.com>
To: Nick Piggin <piggin@cyberone.com.au>
Cc: Jamie Lokier <jamie@shareable.org>,
bill davidsen <davidsen@tmr.com>,
linux-kernel@vger.kernel.org
Subject: Re: [CFT][RFC] HT scheduler
Date: Sun, 14 Dec 2003 11:46:01 +0100 [thread overview]
Message-ID: <1071398761.5233.1.camel@laptop.fenrus.com> (raw)
In-Reply-To: <3FDC3023.9030708@cyberone.com.au>
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> >Regarding the overhead of the shared runqueue lock:
> >
> >Is the "lock" prefix actually required for locking between x86
> >siblings which share the same L1 cache?
> >
>
> That lock is still taken by other CPUs as well for eg. wakeups, balancing,
> and so forth. I guess it could be a very specific optimisation for
> spinlocks in general if there was only one HT core. Don't know if it
> would be worthwhile though.
also keep in mind that current x86 processors all will internally
optimize out the lock prefix in UP mode or when the cacheline is owned
exclusive.... If HT matters here let the cpu optimize it out.....
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next prev parent reply other threads:[~2003-12-14 10:46 UTC|newest]
Thread overview: 80+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-12-08 4:25 [PATCH][RFC] make cpu_sibling_map a cpumask_t Nick Piggin
2003-12-08 15:59 ` Anton Blanchard
2003-12-08 23:08 ` Nick Piggin
2003-12-09 0:14 ` Anton Blanchard
2003-12-11 4:25 ` [CFT][RFC] HT scheduler Nick Piggin
2003-12-11 7:24 ` Nick Piggin
2003-12-11 8:57 ` Nick Piggin
2003-12-11 11:52 ` William Lee Irwin III
2003-12-11 13:09 ` Nick Piggin
2003-12-11 13:23 ` William Lee Irwin III
2003-12-11 13:30 ` Nick Piggin
2003-12-11 13:32 ` William Lee Irwin III
2003-12-11 15:30 ` Nick Piggin
2003-12-11 15:38 ` William Lee Irwin III
2003-12-11 15:51 ` Nick Piggin
2003-12-11 15:56 ` William Lee Irwin III
2003-12-11 16:37 ` Nick Piggin
2003-12-11 16:40 ` William Lee Irwin III
2003-12-12 1:52 ` [PATCH] improve rwsem scalability (was Re: [CFT][RFC] HT scheduler) Nick Piggin
2003-12-12 2:02 ` Nick Piggin
2003-12-12 9:41 ` Ingo Molnar
2003-12-13 0:07 ` Nick Piggin
2003-12-14 0:44 ` Nick Piggin
2003-12-17 5:27 ` Nick Piggin
2003-12-19 11:52 ` Nick Piggin
2003-12-19 15:06 ` Martin J. Bligh
2003-12-20 0:08 ` Nick Piggin
2003-12-12 0:58 ` [CFT][RFC] HT scheduler Rusty Russell
2003-12-11 10:01 ` Rhino
2003-12-11 8:14 ` Nick Piggin
2003-12-11 16:49 ` Rhino
2003-12-11 15:16 ` Nick Piggin
2003-12-11 11:40 ` William Lee Irwin III
2003-12-11 17:05 ` Rhino
2003-12-11 15:17 ` William Lee Irwin III
2003-12-11 16:28 ` Kevin P. Fleming
2003-12-11 16:41 ` Nick Piggin
2003-12-12 2:24 ` Rusty Russell
2003-12-12 7:00 ` Nick Piggin
2003-12-12 7:23 ` Rusty Russell
2003-12-13 6:43 ` Nick Piggin
2003-12-14 1:35 ` bill davidsen
2003-12-14 2:18 ` Nick Piggin
2003-12-14 4:32 ` Jamie Lokier
2003-12-14 9:40 ` Nick Piggin
2003-12-14 10:46 ` Arjan van de Ven [this message]
2003-12-16 17:46 ` Bill Davidsen
2003-12-16 18:22 ` Linus Torvalds
2003-12-17 0:24 ` Davide Libenzi
2003-12-17 0:41 ` Linus Torvalds
2003-12-17 0:54 ` Davide Libenzi
2003-12-16 17:34 ` Bill Davidsen
2003-12-15 5:53 ` Rusty Russell
2003-12-15 23:08 ` Nick Piggin
2003-12-19 4:57 ` Nick Piggin
2003-12-19 5:13 ` Nick Piggin
2003-12-20 2:43 ` Rusty Russell
2003-12-21 2:56 ` Nick Piggin
2004-01-03 18:57 ` Bill Davidsen
2003-12-15 20:21 ` Zwane Mwaikambo
2003-12-15 23:20 ` Nick Piggin
2003-12-16 0:11 ` Zwane Mwaikambo
2003-12-12 8:59 ` Nick Piggin
2003-12-12 15:14 ` Martin J. Bligh
2003-12-08 19:44 ` [PATCH][RFC] make cpu_sibling_map a cpumask_t James Cleverdon
2003-12-08 20:38 ` Ingo Molnar
2003-12-08 20:51 ` Zwane Mwaikambo
2003-12-08 20:55 ` Ingo Molnar
2003-12-08 23:17 ` Nick Piggin
2003-12-08 23:36 ` Ingo Molnar
2003-12-08 23:58 ` Nick Piggin
2003-12-08 23:46 ` Rusty Russell
2003-12-09 13:36 ` Nick Piggin
2003-12-11 21:41 ` bill davidsen
[not found] <20031213022038.300B22C2C1@lists.samba.org.suse.lists.linux.kernel>
[not found] ` <3FDAB517.4000309@cyberone.com.au.suse.lists.linux.kernel>
[not found] ` <brgeo7$huv$1@gatekeeper.tmr.com.suse.lists.linux.kernel>
[not found] ` <3FDBC876.3020603@cyberone.com.au.suse.lists.linux.kernel>
[not found] ` <20031214043245.GC21241@mail.shareable.org.suse.lists.linux.kernel>
[not found] ` <3FDC3023.9030708@cyberone.com.au.suse.lists.linux.kernel>
[not found] ` <1071398761.5233.1.camel@laptop.fenrus.com.suse.lists.linux.kernel>
2003-12-14 16:26 ` [CFT][RFC] HT scheduler Andi Kleen
2003-12-14 16:54 ` Arjan van de Ven
[not found] <200312161127.13691.habanero@us.ibm.com>
2003-12-16 17:37 ` Andrew Theurer
2003-12-17 2:41 ` Nick Piggin
2003-12-16 19:03 Nakajima, Jun
2003-12-17 0:38 Nakajima, Jun
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