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Date: Mon, 03 Feb 2014 14:00:45 +0530 From: Raghavendra K T <raghavendra.kt@...ux.vnet.ibm.com> To: Andrew Morton <akpm@...ux-foundation.org> CC: Raghavendra K T <raghavendra.kt@...ux.vnet.ibm.com>, Fengguang Wu <fengguang.wu@...el.com>, David Cohen <david.a.cohen@...ux.intel.com>, Al Viro <viro@...iv.linux.org.uk>, Damien Ramonda <damien.ramonda@...el.com>, Jan Kara <jack@...e.cz>, Linus <torvalds@...ux-foundation.org>, linux-mm@...ck.org, linux-kernel@...r.kernel.org Subject: Re: [RFC PATCH V5] mm readahead: Fix readahead fail for no local memory and limit readahead pages On 01/22/2014 04:23 PM, Raghavendra K T wrote: > max_sane_readahead returns zero on the cpu having no local memory > node. Fix that by returning a sanitized number of pages viz., > minimum of (requested pages, 4k) > > Result: > fadvise experiment with FADV_WILLNEED on a x240 machine with 1GB testfile > 32GB* 4G RAM numa machine ( 12 iterations) yielded > > Kernel Avg Stddev > base 7.2963 1.10 % > patched 7.2972 1.18 % > > Reviewed-by: Jan Kara <jack@...e.cz> > Signed-off-by: Raghavendra K T <raghavendra.kt@...ux.vnet.ibm.com> > --- Could you please let me know what do you feel about the patch ? -- 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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