The patch titled
mm: compaction: add /sys trigger for per-node memory compaction
has been added to the -mm tree. Its filename is
mm-compaction-add-sys-trigger-for-per-node-memory-compaction.patch
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------------------------------------------------------
Subject: mm: compaction: add /sys trigger for per-node memory compaction
From: Mel Gorman <mel@xxxxxxxxx>
Add a per-node sysfs file called compact. When the file is written to,
each zone in that node is compacted. The intention that this would be
used by something like a job scheduler in a batch system before a job
starts so that the job can allocate the maximum number of hugepages
without significant start-up cost.
Signed-off-by: Mel Gorman <mel@xxxxxxxxx>
Acked-by: Rik van Riel <riel@xxxxxxxxxx>
Reviewed-by: KOSAKI Motohiro <kosaki.motohiro@xxxxxxxxxxxxxx>
Reviewed-by: Christoph Lameter <cl@xxxxxxxxxxxxxxxxxxxx>
Reviewed-by: Minchan Kim <minchan.kim@xxxxxxxxx>
Reviewed-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@xxxxxxxxxxxxxx>
Cc: Andrea Arcangeli <aarcange@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
Documentation/ABI/testing/sysfs-devices-node | 7 +++++
drivers/base/node.c | 3 ++
include/linux/compaction.h | 16 +++++++++++
mm/compaction.c | 23 +++++++++++++++++
4 files changed, 49 insertions(+)
diff -puN /dev/null Documentation/ABI/testing/sysfs-devices-node
--- /dev/null
+++ a/Documentation/ABI/testing/sysfs-devices-node
@@ -0,0 +1,7 @@
+What: /sys/devices/system/node/nodeX/compact
+Date: February 2010
+Contact: Mel Gorman <mel@xxxxxxxxx>
+Description:
+ When this file is written to, all memory within that node
+ will be compacted. When it completes, memory will be freed
+ into blocks which have as many contiguous pages as possible
diff -puN drivers/base/node.c~mm-compaction-add-sys-trigger-for-per-node-memory-compaction drivers/base/node.c
--- a/drivers/base/node.c~mm-compaction-add-sys-trigger-for-per-node-memory-compaction
+++ a/drivers/base/node.c
@@ -9,6 +9,7 @@
#include <linux/memory.h>
#include <linux/node.h>
#include <linux/hugetlb.h>
+#include <linux/compaction.h>
#include <linux/cpumask.h>
#include <linux/topology.h>
#include <linux/nodemask.h>
@@ -246,6 +247,8 @@ int register_node(struct node *node, int
scan_unevictable_register_node(node);
hugetlb_register_node(node);
+
+ compaction_register_node(node);
}
return error;
}
diff -puN include/linux/compaction.h~mm-compaction-add-sys-trigger-for-per-node-memory-compaction include/linux/compaction.h
--- a/include/linux/compaction.h~mm-compaction-add-sys-trigger-for-per-node-memory-compaction
+++ a/include/linux/compaction.h
@@ -12,4 +12,20 @@ extern int sysctl_compaction_handler(str
void __user *buffer, size_t *length, loff_t *ppos);
#endif /* CONFIG_COMPACTION */
+#if defined(CONFIG_COMPACTION) && defined(CONFIG_SYSFS) && defined(CONFIG_NUMA)
+extern int compaction_register_node(struct node *node);
+extern void compaction_unregister_node(struct node *node);
+
+#else
+
+static inline int compaction_register_node(struct node *node)
+{
+ return 0;
+}
+
+static inline void compaction_unregister_node(struct node *node)
+{
+}
+#endif /* CONFIG_COMPACTION && CONFIG_SYSFS && CONFIG_NUMA */
+
#endif /* _LINUX_COMPACTION_H */
diff -puN mm/compaction.c~mm-compaction-add-sys-trigger-for-per-node-memory-compaction mm/compaction.c
--- a/mm/compaction.c~mm-compaction-add-sys-trigger-for-per-node-memory-compaction
+++ a/mm/compaction.c
@@ -13,6 +13,7 @@
#include <linux/mm_inline.h>
#include <linux/backing-dev.h>
#include <linux/sysctl.h>
+#include <linux/sysfs.h>
#include "internal.h"
/*
@@ -437,3 +438,25 @@ int sysctl_compaction_handler(struct ctl
return 0;
}
+
+#if defined(CONFIG_SYSFS) && defined(CONFIG_NUMA)
+ssize_t sysfs_compact_node(struct sys_device *dev,
+ struct sysdev_attribute *attr,
+ const char *buf, size_t count)
+{
+ compact_node(dev->id);
+
+ return count;
+}
+static SYSDEV_ATTR(compact, S_IWUSR, NULL, sysfs_compact_node);
+
+int compaction_register_node(struct node *node)
+{
+ return sysdev_create_file(&node->sysdev, &attr_compact);
+}
+
+void compaction_unregister_node(struct node *node)
+{
+ return sysdev_remove_file(&node->sysdev, &attr_compact);
+}
+#endif /* CONFIG_SYSFS && CONFIG_NUMA */
_
Patches currently in -mm which might be from mel@xxxxxxxxx are
page-allocator-reduce-fragmentation-in-buddy-allocator-by-adding-buddies-that-are-merging-to-the-tail-of-the-free-lists.patch
mempolicy-remove-redundant-code.patch
mm-default-to-node-zonelist-ordering-when-nodes-have-only-lowmem.patch
mm-migration-take-a-reference-to-the-anon_vma-before-migrating.patch
mm-migration-do-not-try-to-migrate-unmapped-anonymous-pages.patch
mm-share-the-anon_vma-ref-counts-between-ksm-and-page-migration.patch
mm-allow-config_migration-to-be-set-without-config_numa-or-memory-hot-remove.patch
mm-export-unusable-free-space-index-via-proc-unusable_index.patch
mm-export-fragmentation-index-via-proc-extfrag_index.patch
mm-move-definition-for-lru-isolation-modes-to-a-header.patch
mm-compaction-memory-compaction-core.patch
mm-compaction-add-proc-trigger-for-memory-compaction.patch
mm-compaction-add-sys-trigger-for-per-node-memory-compaction.patch
mm-compaction-direct-compact-when-a-high-order-allocation-fails.patch
mm-compaction-add-a-tunable-that-decides-when-memory-should-be-compacted-and-when-it-should-be-reclaimed.patch
mm-compaction-do-not-compact-within-a-preferred-zone-after-a-compaction-failure.patch
mm-migration-allow-the-migration-of-pageswapcache-pages.patch
delay-accounting-re-implement-c-for-getdelaysc-to-report-information-on-a-target-command.patch
delay-accounting-re-implement-c-for-getdelaysc-to-report-information-on-a-target-command-checkpatch-fixes.patch
add-debugging-aid-for-memory-initialisation-problems.patch
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