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Date: Thu, 5 Nov 2009 10:10:56 -0500 (EST) From: Christoph Lameter <cl@...ux-foundation.org> To: KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com> cc: "hugh.dickins@...cali.co.uk" <hugh.dickins@...cali.co.uk>, linux-mm@...ck.org, linux-kernel@...r.kernel.org, akpm@...ux-foundation.org, Tejun Heo <tj@...nel.org> Subject: Re: [MM] Make mm counters per cpu instead of atomic On Thu, 5 Nov 2009, KAMEZAWA Hiroyuki wrote: > Hmm, I don't fully understand _new_ percpu but... > In logical (even if not realistic), x86-32 supports up to 512 ? cpus in Kconfig. > BIGSMP. x86-32 only supports 32 processors. Plus per cpu areas are only allocated for the possible processors. > Then, if 65536 process runs, this consumes > > 65536(nr_proc) * 8 (size) * 512(cpus) = 256MBytes. With 32 possible cpus this results in 16m of per cpu space use. -- 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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