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Date: Thu, 27 Nov 2008 04:46:15 -0500 From: Christoph Hellwig <hch@...radead.org> To: Eric Dumazet <dada1@...mosbay.com> Cc: Ingo Molnar <mingo@...e.hu>, David Miller <davem@...emloft.net>, "Rafael J. Wysocki" <rjw@...k.pl>, linux-kernel@...r.kernel.org, kernel-testers@...r.kernel.org, Mike Galbraith <efault@....de>, Peter Zijlstra <a.p.zijlstra@...llo.nl>, Linux Netdev List <netdev@...r.kernel.org>, Christoph Lameter <cl@...ux-foundation.org>, Christoph Hellwig <hch@...radead.org> Subject: Re: [PATCH 3/6] fs: Introduce a per_cpu last_ino allocator On Thu, Nov 27, 2008 at 12:32:24AM +0100, Eric Dumazet wrote: > new_inode() dirties a contended cache line to get inode numbers. > > Solve this problem by providing to each cpu a per_cpu variable, > feeded by the shared last_ino, but once every 1024 allocations. > > This reduce contention on the shared last_ino. > > Note : last_ino_get() method must be called with preemption > disabled on SMP. Looks a little clumsy. One idea might be to have a special slab for synthetic inodes using new_inode and only assign it on the first allocation and after that re-use it. -- 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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