From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from psmtp.com (na3sys010amx117.postini.com [74.125.245.117]) by kanga.kvack.org (Postfix) with SMTP id 7C6DB6B005D for ; Thu, 10 Jan 2013 06:14:04 -0500 (EST) Date: Thu, 10 Jan 2013 11:14:03 +0000 From: Eric Wong Subject: Re: [v2] fadvise: perform WILLNEED readahead asynchronously Message-ID: <20130110111403.GA730@dcvr.yhbt.net> References: <20121225022251.GA25992@dcvr.yhbt.net> <50EE8B6B.1050204@gmail.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <50EE8B6B.1050204@gmail.com> Sender: owner-linux-mm@kvack.org List-ID: To: Riccardo Magliocchetti Cc: linux-mm@kvack.org, linux-kernel@vger.kernel.org, Alan Cox , Dave Chinner , Zheng Liu Riccardo Magliocchetti wrote: > Hello, > > Il 25/12/2012 03:22, Eric Wong ha scritto: > > Any other (Free Software) applications that might benefit from > > lower FADV_WILLNEED latency? > > Not with fadvise but with madvise. Libreoffice / Openoffice.org have > this comment: > > // On Linux, madvise(..., MADV_WILLNEED) appears to have the undesirable > // effect of not returning until the data has actually been paged in, so > // that its net effect would typically be to slow down the process > // (which could start processing at the beginning of the data while the > // OS simultaneously pages in the rest); on other platforms, it remains > // to be evaluated whether madvise or equivalent is available and > // actually useful: > > See: > http://cgit.freedesktop.org/libreoffice/core/tree/sal/osl/unx/file.cxx#n1213 > > May the same approach be extended to madvise MADV_WILLNEED? Definitely yes, it should be easy. This project low-priority for me at the moment, if you or anybody else wants to take a stab at it, please do :) -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org