From mboxrd@z Thu Jan 1 00:00:00 1970 Date: Fri, 15 Sep 2006 14:30:24 +0100 (BST) From: Hugh Dickins Subject: Re: [RFC] page fault retry with NOPAGE_RETRY In-Reply-To: <20060915003529.8a59c542.akpm@osdl.org> Message-ID: References: <1158274508.14473.88.camel@localhost.localdomain> <20060915001151.75f9a71b.akpm@osdl.org> <20060915003529.8a59c542.akpm@osdl.org> MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: owner-linux-mm@kvack.org Return-Path: To: Andrew Morton Cc: Benjamin Herrenschmidt , linux-mm@kvack.org, Linux Kernel list , Linus Torvalds , Mike Waychison List-ID: On Fri, 15 Sep 2006, Andrew Morton wrote: > > This assumes that no other heavyweight process will try to modify this > single-threaded process's mm. I don't _think_ that happens anywhere, does > it? access_process_vm() is the only case I can think of, "Modify" in the sense of fault into. Yes, access_process_vm() is all I can think of too. > and it does down_read(other process's mmap_sem). If there were anything else, it'd have to do so too (if not down_write). I too like NOPAGE_RETRY: as you've both observed, it can help to solve several different problems. Hugh -- 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