From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail143.messagelabs.com (mail143.messagelabs.com [216.82.254.35]) by kanga.kvack.org (Postfix) with SMTP id E13896B00CC for ; Tue, 2 Nov 2010 12:38:40 -0400 (EDT) Received: by iwn38 with SMTP id 38so7891445iwn.14 for ; Tue, 02 Nov 2010 09:38:39 -0700 (PDT) MIME-Version: 1.0 Date: Tue, 2 Nov 2010 19:32:40 +0300 Message-ID: Subject: Low priority writers make realtime processes thrashing From: Evgeniy Ivanov Content-Type: text/plain; charset=ISO-8859-1 Sender: owner-linux-mm@kvack.org To: linux-mm@kvack.org List-ID: Hi, When I run few "hard-writers" I get problems with my 15 realtime processes (do some very small writes, just 2 pages per-time): they start thrashing. I thought it's caused by write-back and was waiting for Greg Tellen's per-cgroup dirty page accounting patch. Before testing it I tried to change threshold in page-writeback.c:get_dirty_limits(), I set dirty_ratio for RT process 80% (instead of just extra dirty / 4), but it didn't help me. What else can cause problems? I'm linux kernel newbie and will appreciate any addvices. -- Evgeniy Ivanov -- 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/ . Fight unfair telecom policy in Canada: sign http://dissolvethecrtc.ca/ Don't email: email@kvack.org