From: Eric Dumazet <dada1@cosmosbay.com>
To: Andi Kleen <ak@suse.de>
Cc: Linus Torvalds <torvalds@osdl.org>,
linux-kernel@vger.kernel.org,
"David S. Miller" <davem@davemloft.net>,
Dipankar Sarma <dipankar@in.ibm.com>,
"Paul E. McKenney" <paulmck@us.ibm.com>,
Manfred Spraul <manfred@colorfullife.com>,
netdev@vger.kernel.org
Subject: Re: [PATCH, RFC] RCU : OOM avoidance and lower latency
Date: Fri, 06 Jan 2006 14:09:40 +0100 [thread overview]
Message-ID: <43BE6C14.5080904@cosmosbay.com> (raw)
In-Reply-To: <200601061358.42344.ak@suse.de>
Andi Kleen a écrit :
> On Friday 06 January 2006 11:17, Eric Dumazet wrote:
>
>> I assume that if a CPU queued 10.000 items in its RCU queue, then the
>> oldest entry cannot still be in use by another CPU. This might sounds as a
>> violation of RCU rules, (I'm not an RCU expert) but seems quite reasonable.
>
> I don't think it's a good assumption. Another CPU might be stuck in a long
> running interrupt, and still have a reference in the code running below
> the interrupt handler.
>
> And in general letting correctness depend on magic numbers like this is
> very nasty.
>
I agree Andi, I posted a 2nd version of the patch with no more assumptions.
Eric
next prev parent reply other threads:[~2006-01-06 13:09 UTC|newest]
Thread overview: 24+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <20060105235845.967478000@sorel.sous-sol.org>
[not found] ` <20060106004555.GD25207@sorel.sous-sol.org>
[not found] ` <Pine.LNX.4.64.0601051727070.3169@g5.osdl.org>
2006-01-06 10:17 ` [PATCH, RFC] RCU : OOM avoidance and lower latency Eric Dumazet
2006-01-06 12:52 ` [PATCH, RFC] RCU : OOM avoidance and lower latency (Version 2), HOTPLUG_CPU fix Eric Dumazet
2006-01-06 12:58 ` [PATCH, RFC] RCU : OOM avoidance and lower latency Andi Kleen
2006-01-06 13:09 ` Eric Dumazet [this message]
2006-01-06 19:26 ` Lee Revell
2006-01-06 22:18 ` Andi Kleen
2006-01-06 13:37 ` Alan Cox
2006-01-06 14:00 ` Eric Dumazet
2006-01-06 14:45 ` Alan Cox
2006-01-06 16:47 ` Paul E. McKenney
2006-01-06 17:19 ` Eric Dumazet
2006-01-06 20:26 ` Paul E. McKenney
2006-01-06 20:33 ` David S. Miller
2006-01-06 20:57 ` Andi Kleen
2006-01-07 0:17 ` David S. Miller
2006-01-07 1:09 ` Andi Kleen
2006-01-07 7:10 ` David S. Miller
2006-01-07 7:34 ` Eric Dumazet
2006-01-07 7:44 ` David S. Miller
2006-01-07 7:53 ` Eric Dumazet
2006-01-07 8:36 ` David S. Miller
2006-01-07 20:30 ` Paul E. McKenney
2006-01-07 8:30 ` Eric Dumazet
2006-01-06 19:24 ` Lee Revell
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