From: "Bill Huey (hui)" <bill.huey@gmail.com>
To: "Ingo Molnar" <mingo@elte.hu>
Cc: "Gregory Haskins" <ghaskins@novell.com>,
a.p.zijlstra@chello.nl, tglx@linutronix.de, rostedt@goodmis.org,
linux-rt-users@vger.kernel.org, linux-kernel@vger.kernel.org,
kevin@hilman.org, cminyard@mvista.com, dsingleton@mvista.com,
dwalker@mvista.com, npiggin@suse.de, dsaxena@plexity.net,
ak@suse.de, gregkh@suse.de, sdietrich@novell.com,
pmorreale@novell.com, mkohari@novell.com
Subject: Re: [PATCH [RT] 00/14] RFC - adaptive real-time locks
Date: Thu, 21 Feb 2008 14:53:56 -0800 [thread overview]
Message-ID: <9810cff90802211453l3f62200ey52edfeb9d84d7@mail.gmail.com> (raw)
In-Reply-To: <20080221214219.GA27209@elte.hu>
On Thu, Feb 21, 2008 at 1:42 PM, Ingo Molnar <mingo@elte.hu> wrote:
> I'd not exclude them fundamentally though, it's really the numbers that
> matter. The code is certainly simple enough (albeit the .config and
> sysctl controls are quite ugly and unacceptable - adaptive mutexes
> should really be ... adaptive, with no magic constants in .configs or
> else).
>
> But ... i'm somewhat sceptic, after having played with spin-a-bit
> mutexes before.
Yeah, it's yet another reason to get better instrumentation in -rt for
this purpose and why it's important to only log things in the slow
path so that the front end of the rtmutex doesn't see instrumentation
artifacts in the measurement. If I get a chance tonight, I'll extend
lockdep/lockstat for this purpose if peterz doesn't beat me to it. I
won't have access to the test harness to replicate this though.
bill
next prev parent reply other threads:[~2008-02-21 22:54 UTC|newest]
Thread overview: 59+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-02-21 15:26 Gregory Haskins
2008-02-21 15:26 ` [PATCH [RT] 01/14] spinlocks: fix preemption feature when PREEMPT_RT is enabled Gregory Haskins
2008-02-21 15:26 ` [PATCH [RT] 02/14] spinlock: make preemptible-waiter feature a specific config option Gregory Haskins
2008-02-22 19:09 ` Pavel Machek
2008-02-21 15:26 ` [PATCH [RT] 03/14] x86: FIFO ticket spinlocks Gregory Haskins
2008-02-21 15:26 ` [PATCH [RT] 04/14] disable PREEMPT_SPINLOCK_WAITERS when x86 ticket/fifo spins are in use Gregory Haskins
2008-02-21 15:26 ` [PATCH [RT] 05/14] rearrange rt_spin_lock sleep Gregory Haskins
2008-02-22 13:29 ` Gregory Haskins
2008-02-22 13:35 ` Steven Rostedt
2008-02-22 13:40 ` Peter Zijlstra
2008-02-22 13:35 ` Ingo Molnar
2008-02-22 13:43 ` Steven Rostedt
2008-02-22 13:46 ` Steven Rostedt
2008-02-21 15:26 ` [PATCH [RT] 06/14] optimize rt lock wakeup Gregory Haskins
2008-02-21 15:27 ` [PATCH [RT] 07/14] adaptive real-time lock support Gregory Haskins
2008-02-22 19:14 ` Pavel Machek
2008-02-21 15:27 ` [PATCH [RT] 08/14] add a loop counter based timeout mechanism Gregory Haskins
2008-02-21 16:41 ` Andi Kleen
2008-02-21 17:02 ` Gregory Haskins
2008-02-21 17:04 ` Peter W. Morreale
2008-02-21 17:06 ` Sven-Thorsten Dietrich
2008-02-22 19:08 ` Paul E. McKenney
2008-02-22 19:19 ` Bill Huey (hui)
2008-02-22 19:21 ` Bill Huey (hui)
2008-02-22 19:43 ` Paul E. McKenney
2008-02-22 19:55 ` Sven-Thorsten Dietrich
2008-02-22 20:23 ` Paul E. McKenney
2008-02-22 22:03 ` Gregory Haskins
2008-02-23 12:31 ` Andi Kleen
2008-02-23 16:32 ` Paul E. McKenney
2008-02-25 23:52 ` Sven-Thorsten Dietrich
2008-02-22 20:36 ` Peter W. Morreale
2008-02-23 7:36 ` Sven-Thorsten Dietrich
2008-02-22 20:15 ` Peter W. Morreale
2008-02-21 15:27 ` [PATCH [RT] 09/14] adaptive mutexes Gregory Haskins
2008-02-21 15:27 ` [PATCH [RT] 10/14] adjust pi_lock usage in wakeup Gregory Haskins
2008-02-21 16:48 ` Steven Rostedt
2008-02-21 17:09 ` Peter W. Morreale
2008-02-21 15:27 ` [PATCH [RT] 11/14] optimize the !printk fastpath through the lock acquisition Gregory Haskins
2008-02-21 16:36 ` Andi Kleen
2008-02-21 16:47 ` Gregory Haskins
2008-02-22 19:18 ` Pavel Machek
2008-02-22 22:20 ` Gregory Haskins
2008-02-23 0:43 ` Bill Huey (hui)
2008-02-25 5:20 ` Gregory Haskins
2008-02-25 6:21 ` Bill Huey (hui)
2008-02-25 9:02 ` Bill Huey (hui)
2008-02-21 15:27 ` [PATCH [RT] 12/14] remove the extra call to try_to_take_lock Gregory Haskins
2008-02-21 15:27 ` [PATCH [RT] 13/14] allow rt-mutex lock-stealing to include lateral priority Gregory Haskins
2008-02-21 15:27 ` [PATCH [RT] 14/14] sysctl for runtime-control of lateral mutex stealing Gregory Haskins
2008-02-21 16:05 ` [PATCH [RT] 00/14] RFC - adaptive real-time locks Gregory Haskins
2008-02-21 21:24 ` Ingo Molnar
2008-02-21 21:33 ` Bill Huey (hui)
[not found] ` <20080221214219.GA27209@elte.hu>
2008-02-21 21:56 ` Gregory Haskins
2008-02-21 22:53 ` Bill Huey (hui) [this message]
2008-02-21 21:40 ` Gregory Haskins
2008-02-21 22:12 ` Peter W. Morreale
2008-02-21 22:42 ` Peter W. Morreale
2008-02-23 8:03 ` Andrew Morton
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