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Date: Thu, 23 Feb 2012 17:21:11 +0100 From: Andi Kleen <andi@...stfloor.org> To: Konstantin Khlebnikov <khlebnikov@...nvz.org> Cc: Hugh Dickins <hughd@...gle.com>, linux-kernel@...r.kernel.org, linux-mm@...ck.org, Johannes Weiner <hannes@...xchg.org>, Andrew Morton <akpm@...ux-foundation.org>, KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>, Andi Kleen <andi@...stfloor.org>, tim.c.chen@...ux.intel.com Subject: Re: [PATCH v3 21/21] mm: zone lru vectors interleaving > +config PAGE_LRU_SPLIT > + int "Memory lru lists per zone" > + default 4 if EXPERIMENTAL && SPARSEMEM_VMEMMAP > + default 1 > + help > + The number of lru lists in each memory zone for interleaving. > + Allows to redeuce lru_lock contention, but adds some overhead. > + Without SPARSEMEM_VMEMMAP might be costly. "1" means no split. Could you turn those two numbers into a boot option? Compile time parameters are nasty to use. I suppose it's ok to have an upper limit. > + > +config PAGE_LRU_INTERLEAVING > + int "Memory lru lists interleaving page-order" > + default 12 > + help > + Page order for lru lists interleaving. By default 12 (16Mb). > + Must be greater than huge-page order. > + With CONFIG_PAGE_LRU_SPLIT=1 has no effect. -Andi -- 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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