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authorDavid Rientjes <rientjes@google.com>2009-12-14 17:58:13 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2009-12-15 08:53:12 -0800
commit4e7b8a6cef64a4c1f1194f9926f794c2b75ebdd7 (patch)
treec95a6e4e34e09f8d622451c85b88fe2961fbb6ac /include
parent6d9c285a632b39ab83c6ae14cbff0e606d4042ee (diff)
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nodemask: make NODEMASK_ALLOC more general
This is a series of patches to provide control over the location of the allocation and freeing of persistent huge pages on a NUMA platform. Please consider for merging into mmotm. This series uses two mechanisms to constrain the nodes from which persistent huge pages are allocated: 1) the task NUMA mempolicy of the task modifying a new sysctl "nr_hugepages_mempolicy", based on a suggestion by Mel Gorman; and 2) a subset of the hugepages hstate sysfs attributes have been added [in V4] to each node system device under: /sys/devices/node/node[0-9]*/hugepages The per node attibutes allow direct assignment of a huge page count on a specific node, regardless of the task's mempolicy or cpuset constraints. This patch: NODEMASK_ALLOC(x, m) assumes x is a type of struct, which is unnecessary. It's perfectly reasonable to use this macro to allocate a nodemask_t, which is anonymous, either dynamically or on the stack depending on NODES_SHIFT. Signed-off-by: David Rientjes <rientjes@google.com> Signed-off-by: Lee Schermerhorn <lee.schermerhorn@hp.com> Acked-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> Cc: Mel Gorman <mel@csn.ul.ie> Cc: Randy Dunlap <randy.dunlap@oracle.com> Cc: Nishanth Aravamudan <nacc@us.ibm.com> Cc: Andi Kleen <andi@firstfloor.org> Cc: David Rientjes <rientjes@google.com> Cc: Adam Litke <agl@us.ibm.com> Cc: Andy Whitcroft <apw@canonical.com> Cc: Eric Whitney <eric.whitney@hp.com> Cc: Christoph Lameter <cl@linux-foundation.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'include')
-rw-r--r--include/linux/nodemask.h15
1 files changed, 8 insertions, 7 deletions
diff --git a/include/linux/nodemask.h b/include/linux/nodemask.h
index b359c4a..ca9b489 100644
--- a/include/linux/nodemask.h
+++ b/include/linux/nodemask.h
@@ -481,14 +481,14 @@ static inline int num_node_state(enum node_states state)
/*
* For nodemask scrach area.(See CPUMASK_ALLOC() in cpumask.h)
+ * NODEMASK_ALLOC(x, m) allocates an object of type 'x' with the name 'm'.
*/
-
#if NODES_SHIFT > 8 /* nodemask_t > 64 bytes */
-#define NODEMASK_ALLOC(x, m) struct x *m = kmalloc(sizeof(*m), GFP_KERNEL)
-#define NODEMASK_FREE(m) kfree(m)
+#define NODEMASK_ALLOC(x, m) x *m = kmalloc(sizeof(*m), GFP_KERNEL)
+#define NODEMASK_FREE(m) kfree(m)
#else
-#define NODEMASK_ALLOC(x, m) struct x _m, *m = &_m
-#define NODEMASK_FREE(m)
+#define NODEMASK_ALLOC(x, m) x _m, *m = &_m
+#define NODEMASK_FREE(m) do {} while (0)
#endif
/* A example struture for using NODEMASK_ALLOC, used in mempolicy. */
@@ -497,8 +497,9 @@ struct nodemask_scratch {
nodemask_t mask2;
};
-#define NODEMASK_SCRATCH(x) NODEMASK_ALLOC(nodemask_scratch, x)
-#define NODEMASK_SCRATCH_FREE(x) NODEMASK_FREE(x)
+#define NODEMASK_SCRATCH(x) \
+ NODEMASK_ALLOC(struct nodemask_scratch, x)
+#define NODEMASK_SCRATCH_FREE(x) NODEMASK_FREE(x)
#endif /* __LINUX_NODEMASK_H */