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authorPeter Zijlstra <a.p.zijlstra@chello.nl>2013-02-22 16:34:32 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2013-02-23 17:50:17 -0800
commit75980e97daccfc6babbac7e180ff118537955f5d (patch)
treeb5721bae11eab21a8ee7c2ba4c7f153a59766dd6 /include/linux/page-flags-layout.h
parentbbeae5b05ef6e40bf54db05ceb8635824153b9e2 (diff)
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mm: fold page->_last_nid into page->flags where possible
page->_last_nid fits into page->flags on 64-bit. The unlikely 32-bit NUMA configuration with NUMA Balancing will still need an extra page field. As Peter notes "Completely dropping 32bit support for CONFIG_NUMA_BALANCING would simplify things, but it would also remove the warning if we grow enough 64bit only page-flags to push the last-cpu out." [mgorman@suse.de: minor modifications] Signed-off-by: Mel Gorman <mgorman@suse.de> Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: Andrea Arcangeli <aarcange@redhat.com> Cc: Ingo Molnar <mingo@kernel.org> Cc: Simon Jeons <simon.jeons@gmail.com> Cc: Wanpeng Li <liwanp@linux.vnet.ibm.com> Cc: Hugh Dickins <hughd@google.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'include/linux/page-flags-layout.h')
-rw-r--r--include/linux/page-flags-layout.h33
1 files changed, 25 insertions, 8 deletions
diff --git a/include/linux/page-flags-layout.h b/include/linux/page-flags-layout.h
index 316805d6ba1b..93506a114034 100644
--- a/include/linux/page-flags-layout.h
+++ b/include/linux/page-flags-layout.h
@@ -32,15 +32,16 @@
/*
* page->flags layout:
*
- * There are three possibilities for how page->flags get
- * laid out. The first is for the normal case, without
- * sparsemem. The second is for sparsemem when there is
- * plenty of space for node and section. The last is when
- * we have run out of space and have to fall back to an
- * alternate (slower) way of determining the node.
+ * There are five possibilities for how page->flags get laid out. The first
+ * pair is for the normal case without sparsemem. The second pair is for
+ * sparsemem when there is plenty of space for node and section information.
+ * The last is when there is insufficient space in page->flags and a separate
+ * lookup is necessary.
*
- * No sparsemem or sparsemem vmemmap: | NODE | ZONE | ... | FLAGS |
- * classic sparse with space for node:| SECTION | NODE | ZONE | ... | FLAGS |
+ * No sparsemem or sparsemem vmemmap: | NODE | ZONE | ... | FLAGS |
+ * " plus space for last_nid: | NODE | ZONE | LAST_NID ... | FLAGS |
+ * classic sparse with space for node:| SECTION | NODE | ZONE | ... | FLAGS |
+ * " plus space for last_nid: | SECTION | NODE | ZONE | LAST_NID ... | FLAGS |
* classic sparse no space for node: | SECTION | ZONE | ... | FLAGS |
*/
#if defined(CONFIG_SPARSEMEM) && !defined(CONFIG_SPARSEMEM_VMEMMAP)
@@ -60,6 +61,18 @@
#define NODES_WIDTH 0
#endif
+#ifdef CONFIG_NUMA_BALANCING
+#define LAST_NID_SHIFT NODES_SHIFT
+#else
+#define LAST_NID_SHIFT 0
+#endif
+
+#if SECTIONS_WIDTH+ZONES_WIDTH+NODES_SHIFT+LAST_NID_SHIFT <= BITS_PER_LONG - NR_PAGEFLAGS
+#define LAST_NID_WIDTH LAST_NID_SHIFT
+#else
+#define LAST_NID_WIDTH 0
+#endif
+
/*
* We are going to use the flags for the page to node mapping if its in
* there. This includes the case where there is no node, so it is implicit.
@@ -68,4 +81,8 @@
#define NODE_NOT_IN_PAGE_FLAGS
#endif
+#if defined(CONFIG_NUMA_BALANCING) && LAST_NID_WIDTH == 0
+#define LAST_NID_NOT_IN_PAGE_FLAGS
+#endif
+
#endif /* _LINUX_PAGE_FLAGS_LAYOUT */