From mboxrd@z Thu Jan 1 00:00:00 1970 Date: Tue, 22 Apr 2003 11:55:00 -0400 (EDT) From: Ingo Molnar Subject: Re: objrmap and vmtruncate In-Reply-To: <20030422154248.GI8978@holomorphy.com> Message-ID: MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: owner-linux-mm@kvack.org Return-Path: To: William Lee Irwin III Cc: "Martin J. Bligh" , Andrew Morton , Andrea Arcangeli , mingo@elte.hu, hugh@veritas.com, dmccr@us.ibm.com, Linus Torvalds , linux-kernel@vger.kernel.org, linux-mm@kvack.org List-ID: On Tue, 22 Apr 2003, William Lee Irwin III wrote: > I have to apologize for my misstatements of the problem here. You > yourself pointed out to me the hold time was, in fact, linear. Despite > the linearity of the algorithm, the failure mode persists. I've > postponed further investigation until later, when more invasive > techniques are admissible; /proc/ alone will not suffice if linear > algorithms under tasklist_lock can trigger this failure mode. well, i have myself reproduced 30+ secs worth of pid-alloc related lockups on my box, so it's was definitely not a fata morgana, and the pid-allocation code was definitely quadratic near the PID-space saturation point. There might be something else still biting your system, i'd really be interested in hearing more about it. What workload are you using to trigger it? Ingo -- 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: aart@kvack.org