The patch titled
mm: compaction: add /proc trigger for memory compaction
has been added to the -mm tree. Its filename is
mm-compaction-add-proc-trigger-for-memory-compaction.patch
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------------------------------------------------------
Subject: mm: compaction: add /proc trigger for memory compaction
From: Mel Gorman <mel@xxxxxxxxx>
This patch adds a proc file /proc/sys/vm/compact_memory. When an
arbitrary value is written to the file, all zones are compacted. The
expected user of such a trigger is a job scheduler that prepares the
system before the target application runs.
Signed-off-by: Mel Gorman <mel@xxxxxxxxx>
Acked-by: Rik van Riel <riel@xxxxxxxxxx>
Reviewed-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@xxxxxxxxxxxxxx>
Reviewed-by: Minchan Kim <minchan.kim@xxxxxxxxx>
Reviewed-by: KOSAKI Motohiro <kosaki.motohiro@xxxxxxxxxxxxxx>
Reviewed-by: Christoph Lameter <cl@xxxxxxxxxxxxxxxxxxxx>
Cc: Andrea Arcangeli <aarcange@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
Documentation/sysctl/vm.txt | 11 ++++++
include/linux/compaction.h | 6 +++
kernel/sysctl.c | 10 +++++
mm/compaction.c | 62 +++++++++++++++++++++++++++++++++-
4 files changed, 88 insertions(+), 1 deletion(-)
diff -puN Documentation/sysctl/vm.txt~mm-compaction-add-proc-trigger-for-memory-compaction Documentation/sysctl/vm.txt
--- a/Documentation/sysctl/vm.txt~mm-compaction-add-proc-trigger-for-memory-compaction
+++ a/Documentation/sysctl/vm.txt
@@ -19,6 +19,7 @@ files can be found in mm/swap.c.
Currently, these files are in /proc/sys/vm:
- block_dump
+- compact_memory
- dirty_background_bytes
- dirty_background_ratio
- dirty_bytes
@@ -64,6 +65,16 @@ information on block I/O debugging is in
==============================================================
+compact_memory
+
+Available only when CONFIG_COMPACTION is set. When an arbitrary value
+is written to the file, all zones are compacted such that free memory
+is available in contiguous blocks where possible. This can be important
+for example in the allocation of huge pages although processes will also
+directly compact memory as required.
+
+==============================================================
+
dirty_background_bytes
Contains the amount of dirty memory at which the pdflush background writeback
diff -puN include/linux/compaction.h~mm-compaction-add-proc-trigger-for-memory-compaction include/linux/compaction.h
--- a/include/linux/compaction.h~mm-compaction-add-proc-trigger-for-memory-compaction
+++ a/include/linux/compaction.h
@@ -6,4 +6,10 @@
#define COMPACT_PARTIAL 1
#define COMPACT_COMPLETE 2
+#ifdef CONFIG_COMPACTION
+extern int sysctl_compact_memory;
+extern int sysctl_compaction_handler(struct ctl_table *table, int write,
+ void __user *buffer, size_t *length, loff_t *ppos);
+#endif /* CONFIG_COMPACTION */
+
#endif /* _LINUX_COMPACTION_H */
diff -puN kernel/sysctl.c~mm-compaction-add-proc-trigger-for-memory-compaction kernel/sysctl.c
--- a/kernel/sysctl.c~mm-compaction-add-proc-trigger-for-memory-compaction
+++ a/kernel/sysctl.c
@@ -37,6 +37,7 @@
#include <linux/highuid.h>
#include <linux/writeback.h>
#include <linux/ratelimit.h>
+#include <linux/compaction.h>
#include <linux/hugetlb.h>
#include <linux/initrd.h>
#include <linux/key.h>
@@ -1121,6 +1122,15 @@ static struct ctl_table vm_table[] = {
.mode = 0644,
.proc_handler = drop_caches_sysctl_handler,
},
+#ifdef CONFIG_COMPACTION
+ {
+ .procname = "compact_memory",
+ .data = &sysctl_compact_memory,
+ .maxlen = sizeof(int),
+ .mode = 0200,
+ .proc_handler = sysctl_compaction_handler,
+ },
+#endif /* CONFIG_COMPACTION */
{
.procname = "min_free_kbytes",
.data = &min_free_kbytes,
diff -puN mm/compaction.c~mm-compaction-add-proc-trigger-for-memory-compaction mm/compaction.c
--- a/mm/compaction.c~mm-compaction-add-proc-trigger-for-memory-compaction
+++ a/mm/compaction.c
@@ -12,6 +12,7 @@
#include <linux/compaction.h>
#include <linux/mm_inline.h>
#include <linux/backing-dev.h>
+#include <linux/sysctl.h>
#include "internal.h"
/*
@@ -322,7 +323,7 @@ static void update_nr_listpages(struct c
cc->nr_freepages = nr_freepages;
}
-static inline int compact_finished(struct zone *zone,
+static int compact_finished(struct zone *zone,
struct compact_control *cc)
{
if (fatal_signal_pending(current))
@@ -377,3 +378,62 @@ static int compact_zone(struct zone *zon
return ret;
}
+/* Compact all zones within a node */
+static int compact_node(int nid)
+{
+ int zoneid;
+ pg_data_t *pgdat;
+ struct zone *zone;
+
+ if (nid < 0 || nid >= nr_node_ids || !node_online(nid))
+ return -EINVAL;
+ pgdat = NODE_DATA(nid);
+
+ /* Flush pending updates to the LRU lists */
+ lru_add_drain_all();
+
+ for (zoneid = 0; zoneid < MAX_NR_ZONES; zoneid++) {
+ struct compact_control cc;
+
+ zone = &pgdat->node_zones[zoneid];
+ if (!populated_zone(zone))
+ continue;
+
+ cc.nr_freepages = 0;
+ cc.nr_migratepages = 0;
+ cc.zone = zone;
+ INIT_LIST_HEAD(&cc.freepages);
+ INIT_LIST_HEAD(&cc.migratepages);
+
+ compact_zone(zone, &cc);
+
+ VM_BUG_ON(!list_empty(&cc.freepages));
+ VM_BUG_ON(!list_empty(&cc.migratepages));
+ }
+
+ return 0;
+}
+
+/* Compact all nodes in the system */
+static int compact_nodes(void)
+{
+ int nid;
+
+ for_each_online_node(nid)
+ compact_node(nid);
+
+ return COMPACT_COMPLETE;
+}
+
+/* The written value is actually unused, all memory is compacted */
+int sysctl_compact_memory;
+
+/* This is the entry point for compacting all nodes via /proc/sys/vm */
+int sysctl_compaction_handler(struct ctl_table *table, int write,
+ void __user *buffer, size_t *length, loff_t *ppos)
+{
+ if (write)
+ return compact_nodes();
+
+ return 0;
+}
_
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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