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Date: Sat, 7 Nov 2009 13:19:33 +0900 From: Minchan Kim <minchan.kim@...il.com> To: Christoph Lameter <cl@...ux-foundation.org> Cc: npiggin@...e.de, linux-kernel@...r.kernel.org, linux-mm@...ck.org, Tejun Heo <tj@...nel.org>, Ingo Molnar <mingo@...e.hu>, KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>, "hugh.dickins@...cali.co.uk" <hugh.dickins@...cali.co.uk> Subject: Re: Subject: [RFC MM] mmap_sem scaling: Use mutex and percpu counter instead On Sat, Nov 7, 2009 at 2:10 AM, Christoph Lameter <cl@...ux-foundation.org> wrote: > On Sat, 7 Nov 2009, Minchan Kim wrote: > >> How about change from 'mm_readers' to 'is_readers' to improve your >> goal 'scalibility'? > > Good idea. Thanks. Next rev will use your suggestion. > > Any creative thoughts on what to do about the 1 millisecond wait period? > Hmm, it would be importatn to prevent livelock for reader to hold lock continuously before hodling writer than 1 msec write ovhead. First of all, After we solve it, second step is that optimize write overhead, I think. -- Kind regards, Minchan Kim -- 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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