From mboxrd@z Thu Jan 1 00:00:00 1970 From: Mark_H_Johnson@Raytheon.com Subject: Re: Running out of memory in 1 easy step Message-ID: Date: Fri, 15 Sep 2000 08:22:48 -0500 MIME-Version: 1.0 Content-type: text/plain; charset=us-ascii Sender: owner-linux-mm@kvack.org Return-Path: To: hahn@coffee.psychology.mcmaster.ca Cc: linux-mm@kvack.org, Wichert Akkerman List-ID: I hate to ask, but where is this behavior described? I can't find any hint of this behavior in the man page. I'm concerned because we would not have taken the "guard pages" into account when sizing our application's memory usage. We have a real time application where we will also lock the pages into memory - running out of physical memory in this case is "very bad". Thanks. --Mark H Johnson Mark Hahn master.ca> cc: linux-mm@kvack.org, (bcc: Mark H Johnson/RTS/Raytheon/US) Subject: Re: Running out of memory in 1 easy step 09/14/00 06:03 PM > Not likely, there were still a couple hundreds of megabytes free and > the process had allocated about 1.5Gb of data. mmaping 1 to 4096 bytes consumes 8K from your address space: one for the mmaped page, and one (virtual) guard page (unless you use MAP_FIXED, of course.) 4G / 8K is approximately the 458878 you reported. actually, since maps begin at 1G, I would have expected you to run out sooner... regards, mark hahn. -- 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.eu.org/Linux-MM/ -- 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.eu.org/Linux-MM/