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Open Source and information security mailing list archives
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Date: Wed, 8 Feb 2012 09:09:30 +0200 From: Gilad Ben-Yossef <gilad@...yossef.com> To: Jan Kara <jack@...e.cz> Cc: Andrew Morton <akpm@...ux-foundation.org>, "Srivatsa S. Bhat" <srivatsa.bhat@...ux.vnet.ibm.com>, linux-fsdevel@...r.kernel.org, LKML <linux-kernel@...r.kernel.org>, hare@...e.de, Al Viro <viro@...iv.linux.org.uk>, Christoph Hellwig <hch@...radead.org> Subject: Re: [PATCH] vfs: Avoid IPI storm due to bh LRU invalidation On Tue, Feb 7, 2012 at 8:29 PM, Jan Kara <jack@...e.cz> wrote: > On Tue 07-02-12 18:25:18, Gilad Ben-Yossef wrote: >> On Tue, Feb 7, 2012 at 12:25 AM, Jan Kara <jack@...e.cz> wrote: ... >> I think its worth a shot since the mutex just delays the IPIs instead >> of canceling them >> altogether. > Well, mutex will just delay callers but the sequence logic behind the > mutex will reduce number of IPIs a lot - all waiters for mutex will be > satisfied by a single signalling of all CPUs while previously they would > each do the signalling. Oh, you are right. I've missed that part completely. Note to self: never try to read LKML email on your smartphone... Gilad -- Gilad Ben-Yossef Chief Coffee Drinker gilad@...yossef.com Israel Cell: +972-52-8260388 US Cell: +1-973-8260388 http://benyossef.com "If you take a class in large-scale robotics, can you end up in a situation where the homework eats your dog?" -- Jean-Baptiste Queru -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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