From: Andi Kleen <ak@muc.de>
To: Kyle Moffett <mrmacman_g4@mac.com>
Cc: john cooper <john.cooper@timesys.com>, linux-kernel@vger.kernel.org
Subject: Re: spinaphore conceptual draft
Date: Mon, 30 May 2005 13:06:57 +0200 [thread overview]
Message-ID: <m1r7fpvupa.fsf@muc.de> (raw)
In-Reply-To: <A53A981B-98F9-42EC-8939-60A528FEC34E@mac.com> (Kyle Moffett's message of "Fri, 27 May 2005 21:04:37 -0400")
Kyle Moffett <mrmacman_g4@mac.com> writes:
> if (unlikely(CONFIG_SPINAPHORE_CONTEXT_SWITCH <
> ( queued*atomic_get(&sph->hold_time) -
> fast_monotonic_count() - start_time
On many architectures (including popular ones like AMD x86-64)
there is no reliable fast monotonic (1) count unfortunately - except perhaps
jiffies, but that would be far to coarse grained for your purpose.
-Andi
(1) reliable fast monotonic - chose any two instead.
next prev parent reply other threads:[~2005-05-30 11:09 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-05-27 22:31 spinaphore conceptual draft (was discussion of RT patch) David Nicol
2005-05-28 1:04 ` Kyle Moffett
2005-05-29 5:25 ` David Nicol
2005-05-29 13:41 ` Kyle Moffett
2005-05-29 8:42 ` Nikita Danilov
2005-05-29 13:45 ` Kyle Moffett
2005-05-29 13:29 ` Joe Seigh
2005-05-29 15:32 ` Kyle Moffett
2005-05-30 11:06 ` Andi Kleen [this message]
2005-05-30 14:52 ` spinaphore conceptual draft Chris Friesen
2005-05-30 16:40 ` Andi Kleen
2005-05-30 17:11 ` Chris Friesen
2005-05-30 17:46 ` Andi Kleen
2005-05-30 18:04 ` Kyle Moffett
2005-05-30 18:40 ` Vojtech Pavlik
2005-05-30 18:54 ` Kyle Moffett
2005-05-30 19:24 ` Andi Kleen
2005-05-30 19:28 ` Andi Kleen
2005-05-30 19:39 ` Kyle Moffett
2005-05-31 22:25 ` Paul E. McKenney
2005-05-28 1:05 ` spinaphore conceptual draft (was discussion of RT patch) john cooper
2005-05-28 2:02 ` Steven Rostedt
2005-05-28 13:59 ` Alan Cox
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