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Date: Tue, 5 Jan 2010 19:00:26 +0100 From: Andi Kleen <andi@...stfloor.org> To: Christoph Lameter <cl@...ux-foundation.org> Cc: Andi Kleen <andi@...stfloor.org>, Linus Torvalds <torvalds@...ux-foundation.org>, KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>, Minchan Kim <minchan.kim@...il.com>, Peter Zijlstra <a.p.zijlstra@...llo.nl>, "Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>, Peter Zijlstra <peterz@...radead.org>, "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>, "linux-mm@...ck.org" <linux-mm@...ck.org>, "hugh.dickins" <hugh.dickins@...cali.co.uk>, Nick Piggin <nickpiggin@...oo.com.au>, Ingo Molnar <mingo@...e.hu> Subject: Re: [RFC][PATCH 6/8] mm: handle_speculative_fault() On Tue, Jan 05, 2010 at 11:47:49AM -0600, Christoph Lameter wrote: > On Tue, 5 Jan 2010, Andi Kleen wrote: > > > > Oh well. Somebody who is bored might look at trying to make the wrapper > > > code in arch/x86/lib/semaphore_32.S work on x86-64 too. It should make the > > > successful rwsem cases much faster. > > > > Maybe, maybe not. > > What we saw in the past was that the cost of acquiring exclusive > access to the contended cachelines containing mmap_sem and rss counters > was most important. That cost should be about the same between the spinlock and the atomic version. -Andi -- ak@...ux.intel.com -- Speaking for myself only. -- 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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