From mboxrd@z Thu Jan 1 00:00:00 1970 From: Rik van Riel Subject: Re: [PATCH 08/15] readahead: record readahead patterns Date: Thu, 25 Feb 2010 17:37:31 -0500 Message-ID: <4B86FBAB.6070807@redhat.com> References: <20100224031001.026464755@intel.com> <20100224031054.734136802@intel.com> Mime-Version: 1.0 Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit Cc: Andrew Morton , Jens Axboe , Ingo Molnar , Peter Zijlstra , Chris Mason , Clemens Ladisch , Olivier Galibert , Vivek Goyal , Christian Ehrhardt , Matt Mackall , Nick Piggin , Linux Memory Management List , linux-fsdevel@vger.kernel.org, LKML To: Wu Fengguang Return-path: In-Reply-To: <20100224031054.734136802@intel.com> Sender: owner-linux-mm@kvack.org List-Id: linux-fsdevel.vger.kernel.org On 02/23/2010 10:10 PM, Wu Fengguang wrote: > Record the readahead pattern in ra_flags. This info can be examined by > users via the readahead tracing/stats interfaces. > > Currently 7 patterns are defined: > > pattern readahead for > ----------------------------------------------------------- > RA_PATTERN_INITIAL start-of-file/oversize read > RA_PATTERN_SUBSEQUENT trivial sequential read > RA_PATTERN_CONTEXT interleaved sequential read > RA_PATTERN_THRASH thrashed sequential read > RA_PATTERN_MMAP_AROUND mmap fault > RA_PATTERN_FADVISE posix_fadvise() > RA_PATTERN_RANDOM random read > > CC: Ingo Molnar > CC: Jens Axboe > CC: Peter Zijlstra > Signed-off-by: Wu Fengguang Acked-by: Rik van Riel -- 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