From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail138.messagelabs.com (mail138.messagelabs.com [216.82.249.35]) by kanga.kvack.org (Postfix) with ESMTP id 209078D0039 for ; Mon, 31 Jan 2011 19:34:06 -0500 (EST) Received: from d03relay02.boulder.ibm.com (d03relay02.boulder.ibm.com [9.17.195.227]) by e35.co.us.ibm.com (8.14.4/8.13.1) with ESMTP id p110K3tT005429 for ; Mon, 31 Jan 2011 17:20:03 -0700 Received: from d03av01.boulder.ibm.com (d03av01.boulder.ibm.com [9.17.195.167]) by d03relay02.boulder.ibm.com (8.13.8/8.13.8/NCO v9.1) with ESMTP id p110XwQQ245514 for ; Mon, 31 Jan 2011 17:33:58 -0700 Received: from d03av01.boulder.ibm.com (loopback [127.0.0.1]) by d03av01.boulder.ibm.com (8.14.4/8.13.1/NCO v10.0 AVout) with ESMTP id p110Xwhj006148 for ; Mon, 31 Jan 2011 17:33:58 -0700 Subject: [RFC][PATCH 0/6] more detailed per-process transparent hugepage statistics From: Dave Hansen Date: Mon, 31 Jan 2011 16:33:57 -0800 Message-Id: <20110201003357.D6F0BE0D@kernel> Sender: owner-linux-mm@kvack.org To: linux-kernel@vger.kernel.org Cc: linux-mm@kvack.org, Michael J Wolf , Andrea Arcangeli , Dave Hansen List-ID: I'm working on some more reports that transparent huge pages and KSM do not play nicely together. Basically, whenever THP's are present along with KSM, there is a lot of attrition over time, and we do not see much overall progress keeping THP's around: http://sr71.net/~dave/ibm/038_System_Anonymous_Pages.png (That's Karl Rister's graph, thanks Karl!) However, I realized that we do not currently have a nice way to find out where individual THP's might be on the system. We have an overall count, but no way of telling which processes or VMAs they might be in. I started to implement this in the /proc/$pid/smaps code, but quickly realized that the lib/pagewalk.c code unconditionally splits THPs up. This set reworks that code a bit and, in the end, gives you a per-map count of the numbers of huge pages. It also makes it possible for page walks to _not_ split THPs. -- 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