From: "Paul E. McKenney" <paulmck@us.ibm.com>
To: Joe Seigh <jseigh_02@xemaps.com>
Cc: linux-kernel@vger.kernel.org
Subject: Re: RCU + SMR for preemptive kernel/user threads.
Date: Mon, 9 May 2005 18:11:43 -0700 [thread overview]
Message-ID: <20050510011143.GC1337@us.ibm.com> (raw)
In-Reply-To: <opsqivh7agehbc72@grunion>
On Mon, May 09, 2005 at 03:09:33PM -0400, Joe Seigh wrote:
[ . . . ]
> *** The per cpu times are in jiffies rounded off from some higher
> resolution value.
> This means that for n time counters, you may have to wait up to n jiffies
> for
> at least one round up to occur. It would be nicer to have the higher
> resolution
> value or even better a per processor number of interrupts to allow more
> flexibility
> and finer granularity in polling intervals.
You can use smp_call_function() to invoke a function on each of the
other CPUs. The implementations of smp_call_function() use inter-processor
interrupts, which should suffice, but you can always make the called
function just execute a memory barrier.
Thanx, Paul
next prev parent reply other threads:[~2005-05-10 1:11 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-05-09 19:09 Joe Seigh
2005-05-10 1:11 ` Paul E. McKenney [this message]
2005-05-10 13:32 ` Joe Seigh
2005-05-10 16:55 ` Paul E. McKenney
2005-05-10 22:40 ` Joe Seigh
2005-05-11 15:04 ` Paul E. McKenney
2005-05-11 21:47 ` Joe Seigh
2005-05-12 0:39 ` Joe Seigh
2005-05-12 1:57 ` Paul E. McKenney
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