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Date: Mon, 22 Feb 2010 09:16:48 +0100 From: Christian Ehrhardt <ehrhardt@...ux.vnet.ibm.com> To: Wu Fengguang <fengguang.wu@...el.com> CC: Nikanth Karthikesan <knikanth@...e.de>, Dave Chinner <david@...morbit.com>, Ankit Jain <radical@...il.com>, Andrew Morton <akpm@...ux-foundation.org>, "balbir@...ux.vnet.ibm.com" <balbir@...ux.vnet.ibm.com>, Jens Axboe <jens.axboe@...cle.com>, "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>, "linux-mm@...ck.org" <linux-mm@...ck.org> Subject: Re: [PATCH v2] Make VM_MAX_READAHEAD a kernel parameter Wu Fengguang wrote: > Nikanth, > >> I didn't want to impose artificial restrictions. I think Wu's patch set would >> be adding some restrictions, like minimum readahead. He could fix it when he >> modifies the patch to include in his patch set. > > OK, I imposed a larger bound -- 128MB. > And values 1-4095 (more exactly: PAGE_CACHE_SIZE) are prohibited mainly to > catch "readahead=128" where the user really means to do 128 _KB_ readahead. > > Christian, with this patch and more patches to scale down readahead > size on small memory/device size, I guess it's no longer necessary to > introduce a CONFIG_READAHEAD_SIZE? Yes as I mentioned before a kernel parameter supersedes a config symbol in my opinion too. -> agreed > Thanks, > Fengguang > --- -- GrĂ¼sse / regards, Christian Ehrhardt IBM Linux Technology Center, System z Linux Performance -- 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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