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Date: Tue, 18 Mar 2014 12:43:28 +0530 From: Raghavendra K T <raghavendra.kt@...ux.vnet.ibm.com> To: Madper Xie <cxie@...hat.com> CC: Jan Kara <jack@...e.cz>, Andrew Morton <akpm@...ux-foundation.org>, 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>, rientjes@...gle.com, Linus <torvalds@...ux-foundation.org>, nacc@...ux.vnet.ibm.com, linux-mm@...ck.org, linux-kernel@...r.kernel.org Subject: Re: [PATCH V6 ] mm readahead: Fix readahead fail for memoryless cpu and limit readahead pages On 03/17/2014 07:37 AM, Madper Xie wrote: > > Raghavendra K T <raghavendra.kt@...ux.vnet.ibm.com> writes: > >> On 02/18/2014 03:19 PM, Jan Kara wrote: >>> On Tue 18-02-14 12:55:38, Raghavendra K T wrote: > Hi. Just a concern. Will the performance reduce on some special storage > backend? E.g. tape. > The existent applications may using readahead for userspace I/O schedule > to decrease seeking time. I have not tested the patch on such systems yet unfortunately :(. Sequential read with huge file has not suffered on disk based system, but I think, I should be honest enough not to guess the effect on tape. -- 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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