From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail190.messagelabs.com (mail190.messagelabs.com [216.82.249.51]) by kanga.kvack.org (Postfix) with SMTP id 323F58D0039 for ; Tue, 22 Feb 2011 20:52:37 -0500 (EST) From: Andi Kleen Subject: Fix NUMA problems in transparent hugepages v2 Date: Tue, 22 Feb 2011 17:51:54 -0800 Message-Id: <1298425922-23630-1-git-send-email-andi@firstfloor.org> Sender: owner-linux-mm@kvack.org List-ID: To: akpm@linux-foundation.org Cc: linux-kernel@vger.kernel.org, linux-mm@kvack.org v2: I dropped the controversal KSM changes and fixed the interleaving bug. Now it's purely for transparent huge pages. The current transparent hugepages daemon can mess up local memory affinity on NUMA systems. When it copies memory to a huge page it does not necessarily keep it on the same node as the local allocations. While fixing this I also found some more related issues: - The NUMA policy interleaving for THP was using the small page size, not the large parse size. - THP copies also did not preserve the local node - The accounting for local/remote allocations in the daemon was misleading. - There were no VM statistics counters for THP, which made it impossible to analyze. At least some of the bug fixes are 2.6.38 candidates IMHO because some of the NUMA problems are pretty bad. In some workloads this can cause performance problems. What can be delayed are GFP_OTHERNODE and the statistics changes. Git tree: git://git.kernel.org/pub/scm/linux/kernel/git/ak/linux-misc-2.6.git thp-numa Andi Kleen (8): Fix interleaving for transparent hugepages v2 Change alloc_pages_vma to pass down the policy node for local policy Add alloc_page_vma_node Preserve original node for transparent huge page copies Use correct numa policy node for transparent hugepages Add __GFP_OTHER_NODE flag Use GFP_OTHER_NODE for transparent huge pages Add VM counters for transparent hugepages include/linux/gfp.h | 13 ++++++++--- include/linux/vmstat.h | 11 ++++++++- mm/huge_memory.c | 49 +++++++++++++++++++++++++++++++++-------------- mm/mempolicy.c | 16 +++++++------- mm/page_alloc.c | 2 +- mm/vmstat.c | 17 ++++++++++++++- 6 files changed, 76 insertions(+), 32 deletions(-) -- 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 internet charges in Canada: sign http://stopthemeter.ca/ Don't email: email@kvack.org