From: Ingo Molnar <mingo@elte.hu>
To: linux-ia64@vger.kernel.org
Subject: [Linux-ia64] Re: O(1) scheduler "complex" macros
Date: Thu, 11 Jul 2002 09:39:39 +0000 [thread overview]
Message-ID: <marc-linux-ia64-105590701905754@msgid-missing> (raw)
In-Reply-To: <marc-linux-ia64-105590701905752@msgid-missing>
> #define task_running(rq, p) \
> ((rq)->curr = (p)) && !spin_is_locked(&(p)->switch_lock)
one more implementational note: the above test is not 'sharp' in the sense
that on SMP it's only correct (the test has no barriers) if the runqueue
lock is held. This is true for all the critical task_running() uses in
sched.c - and the cases that use it outside the runqueue lock are
optimizations so they dont need an exact test.
Ingo
next prev parent reply other threads:[~2002-07-11 9:39 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2002-07-10 9:05 [Linux-ia64] Re: O(1) scheduler "complex" macros Erich Focht
2002-07-10 12:34 ` Erich Focht
2002-07-10 18:31 ` Ingo Molnar
2002-07-10 19:30 ` Ingo Molnar
2002-07-11 9:25 ` Erich Focht
2002-07-11 9:31 ` Ingo Molnar
2002-07-11 9:39 ` Ingo Molnar [this message]
2002-07-11 9:52 ` Ingo Molnar
2002-07-12 12:39 ` Pavel Machek
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