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Message-Id: <200802081812.22513.nickpiggin@yahoo.com.au> Date: Fri, 8 Feb 2008 18:12:21 +1100 From: Nick Piggin <nickpiggin@...oo.com.au> To: Christoph Lameter <clameter@....com> Cc: Linus Torvalds <torvalds@...ux-foundation.org>, Andrew Morton <akpm@...ux-foundation.org>, LKML <linux-kernel@...r.kernel.org>, linux-mm@...ck.org Subject: Re: [git pull] more SLUB updates for 2.6.25 On Friday 08 February 2008 13:13, Christoph Lameter wrote: > are available in the git repository at: > > git://git.kernel.org/pub/scm/linux/kernel/git/christoph/vm.git slub-linus > > (includes the cmpxchg_local fastpath since the cmpxchg_local work > by Matheiu is in now, and the non atomic unlock by Nick. Verified that > this is not doing any harm after some other patches had been removed. Ah, good. I think it is always a good thing to be able to remove atomics. They place quite a bit of burden on the CPU, especially x86 where it also has implicit memory ordering semantics (although x86 can speculatively get around much of the problem, it's obviously worse than no restriction) Even if perhaps some cache coherency or timing quirk makes the non-atomic version slower (all else being equal), then I'd still say that the non atomic version should be preferred. Thanks, Nick -- 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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