From mboxrd@z Thu Jan 1 00:00:00 1970 Date: Tue, 23 Sep 2008 20:46:56 +0100 From: Mel Gorman Subject: Re: [PATCH 1/2] Report the pagesize backing a VMA in /proc/pid/smaps Message-ID: <20080923194655.GA25542@csn.ul.ie> References: <20080922162152.GB7716@csn.ul.ie> <1222102098.8533.62.camel@nimitz> <20080923211140.DC16.KOSAKI.MOTOHIRO@jp.fujitsu.com> MIME-Version: 1.0 Content-Type: text/plain; charset=iso-8859-15 Content-Disposition: inline In-Reply-To: <20080923211140.DC16.KOSAKI.MOTOHIRO@jp.fujitsu.com> Sender: owner-linux-mm@kvack.org Return-Path: To: KOSAKI Motohiro Cc: Dave Hansen , LKML , Linux-MM List-ID: On (23/09/08 21:15), KOSAKI Motohiro didst pronounce: > > > The corollary is that someone running with a 64K base page kernel may be > > > surprised that the pagesize is always 4K. However I'll check if there is > > > a simple way of checking out if the MMU size differs from PAGE_SIZE. > > > > Sure. If it isn't easy, the best thing to do is probably just to > > document the "interesting" behavior. > > Dave, please let me know getpagesize() function return to 4k or 64k on ppc64. > I think the PageSize line of the /proc/pid/smap and getpagesize() result should be matched. > > otherwise, enduser may be confused. > To distinguish between the two, I now report the kernel pagesize and the mmu pagesize like so KernelPageSize: 64 kB MMUPageSize: 4 kB This is running a kernel with a 64K base pagesize on a PPC970MP which does not support 64K hardware pagesizes. Does this make sense? -- Mel Gorman Part-time Phd Student Linux Technology Center University of Limerick IBM Dublin Software Lab -- 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