From: Andi Kleen <andi@firstfloor.org>
To: akpm@linux-foundation.org
Cc: aarcange@redhat.com, linux-mm@kvack.org, linux-kernel@vger.kernel.org
Subject: Fix NUMA problems in transparent hugepages and KSM
Date: Wed, 2 Mar 2011 16:45:20 -0800 [thread overview]
Message-ID: <1299113128-11349-1-git-send-email-andi@firstfloor.org> (raw)
[Updated version, mainly for integrating Andrea's fixes.
This should be ready for merge now. At least the core
bug fixes for hugepaged I would like to see in 38.]
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.
- KSM and 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
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next reply other threads:[~2011-03-03 0:46 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-03-03 0:45 Andi Kleen [this message]
2011-03-03 0:45 ` [PATCH 1/8] Fix interleaving for transparent hugepages v2 Andi Kleen
2011-03-03 2:12 ` KAMEZAWA Hiroyuki
2011-03-03 0:45 ` [PATCH 2/8] Change alloc_pages_vma to pass down the policy node for local policy Andi Kleen
2011-03-03 2:14 ` KAMEZAWA Hiroyuki
2011-03-03 0:45 ` [PATCH 3/8] Add alloc_page_vma_node Andi Kleen
2011-03-03 2:15 ` KAMEZAWA Hiroyuki
2011-03-03 0:45 ` [PATCH 4/8] Preserve original node for transparent huge page copies Andi Kleen
2011-03-03 2:17 ` KAMEZAWA Hiroyuki
2011-03-03 0:45 ` [PATCH 5/8] Use correct numa policy node for transparent hugepages Andi Kleen
2011-03-03 2:26 ` KAMEZAWA Hiroyuki
2011-03-03 0:45 ` [PATCH 6/8] Add __GFP_OTHER_NODE flag Andi Kleen
2011-03-03 2:33 ` KAMEZAWA Hiroyuki
2011-03-03 0:45 ` [PATCH 7/8] Use GFP_OTHER_NODE for transparent huge pages Andi Kleen
2011-03-03 2:35 ` KAMEZAWA Hiroyuki
2011-03-03 0:45 ` [PATCH 8/8] Add VM counters for transparent hugepages Andi Kleen
2011-03-03 9:18 ` Johannes Weiner
2011-03-03 18:09 ` Andi Kleen
-- strict thread matches above, loose matches on Subject: below --
2011-03-03 19:59 Fix NUMA problems in transparent hugepages and KSM Andi Kleen
2011-02-21 19:07 Andi Kleen
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