From mboxrd@z Thu Jan 1 00:00:00 1970 From: Anton Salikhmetov Subject: [PATCH -v5 0/2] Updating ctime and mtime for memory-mapped files Date: Thu, 17 Jan 2008 03:57:44 +0300 Message-Id: <12005314662518-git-send-email-salikhmetov@gmail.com> Sender: owner-linux-mm@kvack.org Return-Path: To: linux-mm@kvack.org, jakob@unthought.net, linux-kernel@vger.kernel.org, valdis.kletnieks@vt.edu, riel@redhat.com, ksm@42.dk, staubach@redhat.com, jesper.juhl@gmail.com, torvalds@linux-foundation.org, a.p.zijlstra@chello.nl, akpm@linux-foundation.org, protasnb@gmail.com, miklos@szeredi.hu, r.e.wolff@bitwizard.nl, hidave.darkstar@gmail.com, hch@infradead.org List-ID: This is the fifth version of my solution for the bug #2645: http://bugzilla.kernel.org/show_bug.cgi?id=2645 New since the previous version: 1) the case of retouching an already-dirty page pointed out by Miklos Szeredi has been correctly addressed; 2) a few cosmetic changes according to the latest feedback; 3) fixed the error of calling a possibly sleeping function from an atomic context. The design for the first item above was suggested by Peter Zijlstra: > It would require scanning the PTEs and marking them read-only again on > MS_ASYNC, and some more logic in set_page_dirty() because that currently > bails out early if the page in question is already dirty. Miklos' test program now produces the following output for the repeated calls to msync() with the MS_ASYNC flag: debian:~/miklos# ./miklos_test file begin 1200529196 1200529196 1200528798 write 1200529197 1200529197 1200528798 mmap 1200529197 1200529197 1200529198 b 1200529197 1200529197 1200529198 msync b 1200529199 1200529199 1200529198 c 1200529199 1200529199 1200529198 msync c 1200529201 1200529201 1200529198 d 1200529201 1200529201 1200529198 munmap 1200529201 1200529201 1200529198 close 1200529201 1200529201 1200529198 sync 1200529204 1200529204 1200529198 debian:~/miklos# Miklos' test program can be found using the following link: http://lkml.org/lkml/2008/1/14/104 -- 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