From: Andi Kleen <andi@firstfloor.org>
To: akpm@linux-foundation.org
Cc: linux-kernel@vger.kernel.org, linux-mm@kvack.org
Subject: Fix NUMA problems in transparent hugepages v2
Date: Tue, 22 Feb 2011 17:51:54 -0800 [thread overview]
Message-ID: <1298425922-23630-1-git-send-email-andi@firstfloor.org> (raw)
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(-)
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next reply other threads:[~2011-02-23 1:52 UTC|newest]
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-02-23 1:51 Andi Kleen [this message]
2011-02-23 1:51 ` [PATCH 1/8] Fix interleaving for transparent hugepages v2 Andi Kleen
2011-02-23 19:26 ` Christoph Lameter
2011-02-24 23:23 ` Andrea Arcangeli
2011-02-23 1:51 ` [PATCH 2/8] Change alloc_pages_vma to pass down the policy node for local policy Andi Kleen
2011-02-23 1:51 ` [PATCH 3/8] Add alloc_page_vma_node Andi Kleen
2011-02-23 1:51 ` [PATCH 4/8] Preserve original node for transparent huge page copies Andi Kleen
2011-02-23 1:51 ` [PATCH 5/8] Use correct numa policy node for transparent hugepages Andi Kleen
2011-02-23 1:52 ` [PATCH 6/8] Add __GFP_OTHER_NODE flag Andi Kleen
2011-02-23 1:52 ` [PATCH 7/8] Use GFP_OTHER_NODE for transparent huge pages Andi Kleen
2011-02-24 4:56 ` Andrea Arcangeli
2011-02-23 1:52 ` [PATCH 8/8] Add VM counters for transparent hugepages Andi Kleen
2011-02-24 4:18 ` Andrea Arcangeli
2011-02-24 22:43 ` Dave Hansen
2011-02-24 23:15 ` Andrea Arcangeli
2011-02-24 22:43 ` Dave Hansen
2011-02-24 23:14 ` Andrea Arcangeli
2011-02-25 1:36 ` Andi Kleen
2011-02-25 0:51 ` Andrea Arcangeli
2011-02-25 1:12 ` Andi Kleen
2011-02-25 1:34 ` Andrea Arcangeli
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