From mboxrd@z Thu Jan 1 00:00:00 1970 From: Christoph Hellwig Subject: Re: [PATCH v2 2/4] mm: introduce fincore() Date: Fri, 4 Jul 2014 03:12:30 -0700 Message-ID: <20140704101230.GA24688@infradead.org> References: <1404424335-30128-1-git-send-email-n-horiguchi@ah.jp.nec.com> <1404424335-30128-3-git-send-email-n-horiguchi@ah.jp.nec.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Return-path: Content-Disposition: inline In-Reply-To: <1404424335-30128-3-git-send-email-n-horiguchi@ah.jp.nec.com> Sender: owner-linux-mm@kvack.org To: Naoya Horiguchi Cc: Andrew Morton , Konstantin Khlebnikov , Wu Fengguang , Arnaldo Carvalho de Melo , Borislav Petkov , "Kirill A. Shutemov" , Johannes Weiner , Rusty Russell , David Miller , Andres Freund , linux-kernel@vger.kernel.org, linux-mm@kvack.org, Dave Hansen , Christoph Hellwig , Michael Kerrisk , Linux API , Naoya Horiguchi List-Id: linux-api@vger.kernel.org On Thu, Jul 03, 2014 at 05:52:13PM -0400, Naoya Horiguchi wrote: > This patch provides a new system call fincore(2), which provides mincore()- > like information, i.e. page residency of a given file. But unlike mincore(), > fincore() has a mode flag which allows us to extract detailed information > about page cache like pfn and page flag. This kind of information is very > helpful, for example when applications want to know the file cache status > to control the IO on their own way. It's still a nasty multiplexer for multiple different reporting formats in a single system call. How about your really just do a fincore that mirrors mincore instead of piggybacking exports of various internal flags (tags and page flags onto it. -- 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