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-rw-r--r--include/linux/compaction.h10
-rw-r--r--include/linux/migrate.h12
-rw-r--r--mm/compaction.c14
-rw-r--r--mm/memory-failure.c8
-rw-r--r--mm/memory_hotplug.c3
-rw-r--r--mm/mempolicy.c4
-rw-r--r--mm/migrate.c22
-rw-r--r--mm/page_alloc.c21
-rw-r--r--mm/vmscan.c3
9 files changed, 63 insertions, 34 deletions
diff --git a/include/linux/compaction.h b/include/linux/compaction.h
index 2592883..72cba40 100644
--- a/include/linux/compaction.h
+++ b/include/linux/compaction.h
@@ -21,10 +21,11 @@ extern int sysctl_extfrag_handler(struct ctl_table *table, int write,
extern int fragmentation_index(struct zone *zone, unsigned int order);
extern unsigned long try_to_compact_pages(struct zonelist *zonelist,
- int order, gfp_t gfp_mask, nodemask_t *mask);
+ int order, gfp_t gfp_mask, nodemask_t *mask,
+ bool sync);
extern unsigned long compaction_suitable(struct zone *zone, int order);
extern unsigned long compact_zone_order(struct zone *zone, int order,
- gfp_t gfp_mask);
+ gfp_t gfp_mask, bool sync);
/* Do not skip compaction more than 64 times */
#define COMPACT_MAX_DEFER_SHIFT 6
@@ -57,7 +58,8 @@ static inline bool compaction_deferred(struct zone *zone)
#else
static inline unsigned long try_to_compact_pages(struct zonelist *zonelist,
- int order, gfp_t gfp_mask, nodemask_t *nodemask)
+ int order, gfp_t gfp_mask, nodemask_t *nodemask,
+ bool sync)
{
return COMPACT_CONTINUE;
}
@@ -68,7 +70,7 @@ static inline unsigned long compaction_suitable(struct zone *zone, int order)
}
static inline unsigned long compact_zone_order(struct zone *zone, int order,
- gfp_t gfp_mask)
+ gfp_t gfp_mask, bool sync)
{
return 0;
}
diff --git a/include/linux/migrate.h b/include/linux/migrate.h
index 085527f..fa31902 100644
--- a/include/linux/migrate.h
+++ b/include/linux/migrate.h
@@ -13,9 +13,11 @@ extern void putback_lru_pages(struct list_head *l);
extern int migrate_page(struct address_space *,
struct page *, struct page *);
extern int migrate_pages(struct list_head *l, new_page_t x,
- unsigned long private, int offlining);
+ unsigned long private, int offlining,
+ bool sync);
extern int migrate_huge_pages(struct list_head *l, new_page_t x,
- unsigned long private, int offlining);
+ unsigned long private, int offlining,
+ bool sync);
extern int fail_migrate_page(struct address_space *,
struct page *, struct page *);
@@ -33,9 +35,11 @@ extern int migrate_huge_page_move_mapping(struct address_space *mapping,
static inline void putback_lru_pages(struct list_head *l) {}
static inline int migrate_pages(struct list_head *l, new_page_t x,
- unsigned long private, int offlining) { return -ENOSYS; }
+ unsigned long private, int offlining,
+ bool sync) { return -ENOSYS; }
static inline int migrate_huge_pages(struct list_head *l, new_page_t x,
- unsigned long private, int offlining) { return -ENOSYS; }
+ unsigned long private, int offlining,
+ bool sync) { return -ENOSYS; }
static inline int migrate_prep(void) { return -ENOSYS; }
static inline int migrate_prep_local(void) { return -ENOSYS; }
diff --git a/mm/compaction.c b/mm/compaction.c
index 8fe917e..47fca10 100644
--- a/mm/compaction.c
+++ b/mm/compaction.c
@@ -33,6 +33,7 @@ struct compact_control {
unsigned long nr_migratepages; /* Number of pages to migrate */
unsigned long free_pfn; /* isolate_freepages search base */
unsigned long migrate_pfn; /* isolate_migratepages search base */
+ bool sync; /* Synchronous migration */
/* Account for isolated anon and file pages */
unsigned long nr_anon;
@@ -455,7 +456,8 @@ static int compact_zone(struct zone *zone, struct compact_control *cc)
nr_migrate = cc->nr_migratepages;
migrate_pages(&cc->migratepages, compaction_alloc,
- (unsigned long)cc, 0);
+ (unsigned long)cc, 0,
+ cc->sync);
update_nr_listpages(cc);
nr_remaining = cc->nr_migratepages;
@@ -482,7 +484,8 @@ static int compact_zone(struct zone *zone, struct compact_control *cc)
}
unsigned long compact_zone_order(struct zone *zone,
- int order, gfp_t gfp_mask)
+ int order, gfp_t gfp_mask,
+ bool sync)
{
struct compact_control cc = {
.nr_freepages = 0,
@@ -490,6 +493,7 @@ unsigned long compact_zone_order(struct zone *zone,
.order = order,
.migratetype = allocflags_to_migratetype(gfp_mask),
.zone = zone,
+ .sync = sync,
};
INIT_LIST_HEAD(&cc.freepages);
INIT_LIST_HEAD(&cc.migratepages);
@@ -505,11 +509,13 @@ int sysctl_extfrag_threshold = 500;
* @order: The order of the current allocation
* @gfp_mask: The GFP mask of the current allocation
* @nodemask: The allowed nodes to allocate from
+ * @sync: Whether migration is synchronous or not
*
* This is the main entry point for direct page compaction.
*/
unsigned long try_to_compact_pages(struct zonelist *zonelist,
- int order, gfp_t gfp_mask, nodemask_t *nodemask)
+ int order, gfp_t gfp_mask, nodemask_t *nodemask,
+ bool sync)
{
enum zone_type high_zoneidx = gfp_zone(gfp_mask);
int may_enter_fs = gfp_mask & __GFP_FS;
@@ -533,7 +539,7 @@ unsigned long try_to_compact_pages(struct zonelist *zonelist,
nodemask) {
int status;
- status = compact_zone_order(zone, order, gfp_mask);
+ status = compact_zone_order(zone, order, gfp_mask, sync);
rc = max(status, rc);
/* If a normal allocation would succeed, stop compacting */
diff --git a/mm/memory-failure.c b/mm/memory-failure.c
index 46ab2c0..2323a80 100644
--- a/mm/memory-failure.c
+++ b/mm/memory-failure.c
@@ -1290,9 +1290,10 @@ static int soft_offline_huge_page(struct page *page, int flags)
/* Keep page count to indicate a given hugepage is isolated. */
list_add(&hpage->lru, &pagelist);
- ret = migrate_huge_pages(&pagelist, new_page, MPOL_MF_MOVE_ALL, 0);
+ ret = migrate_huge_pages(&pagelist, new_page, MPOL_MF_MOVE_ALL, 0,
+ true);
if (ret) {
- putback_lru_pages(&pagelist);
+ putback_lru_pages(&pagelist);
pr_debug("soft offline: %#lx: migration failed %d, type %lx\n",
pfn, ret, page->flags);
if (ret > 0)
@@ -1413,7 +1414,8 @@ int soft_offline_page(struct page *page, int flags)
LIST_HEAD(pagelist);
list_add(&page->lru, &pagelist);
- ret = migrate_pages(&pagelist, new_page, MPOL_MF_MOVE_ALL, 0);
+ ret = migrate_pages(&pagelist, new_page, MPOL_MF_MOVE_ALL,
+ 0, true);
if (ret) {
pr_info("soft offline: %#lx: migration failed %d, type %lx\n",
pfn, ret, page->flags);
diff --git a/mm/memory_hotplug.c b/mm/memory_hotplug.c
index 2c6523a..584fc55 100644
--- a/mm/memory_hotplug.c
+++ b/mm/memory_hotplug.c
@@ -733,7 +733,8 @@ do_migrate_range(unsigned long start_pfn, unsigned long end_pfn)
goto out;
}
/* this function returns # of failed pages */
- ret = migrate_pages(&source, hotremove_migrate_alloc, 0, 1);
+ ret = migrate_pages(&source, hotremove_migrate_alloc, 0,
+ 1, true);
if (ret)
putback_lru_pages(&source);
}
diff --git a/mm/mempolicy.c b/mm/mempolicy.c
index 11ff260..9db2745 100644
--- a/mm/mempolicy.c
+++ b/mm/mempolicy.c
@@ -935,7 +935,7 @@ static int migrate_to_node(struct mm_struct *mm, int source, int dest,
return PTR_ERR(vma);
if (!list_empty(&pagelist)) {
- err = migrate_pages(&pagelist, new_node_page, dest, 0);
+ err = migrate_pages(&pagelist, new_node_page, dest, 0, true);
if (err)
putback_lru_pages(&pagelist);
}
@@ -1155,7 +1155,7 @@ static long do_mbind(unsigned long start, unsigned long len,
if (!list_empty(&pagelist)) {
nr_failed = migrate_pages(&pagelist, new_vma_page,
- (unsigned long)vma, 0);
+ (unsigned long)vma, 0, true);
if (nr_failed)
putback_lru_pages(&pagelist);
}
diff --git a/mm/migrate.c b/mm/migrate.c
index 94875b2..dc47f6c 100644
--- a/mm/migrate.c
+++ b/mm/migrate.c
@@ -614,7 +614,7 @@ static int move_to_new_page(struct page *newpage, struct page *page,
* to the newly allocated page in newpage.
*/
static int unmap_and_move(new_page_t get_new_page, unsigned long private,
- struct page *page, int force, int offlining)
+ struct page *page, int force, int offlining, bool sync)
{
int rc = 0;
int *result = NULL;
@@ -682,7 +682,7 @@ static int unmap_and_move(new_page_t get_new_page, unsigned long private,
BUG_ON(charge);
if (PageWriteback(page)) {
- if (!force)
+ if (!force || !sync)
goto uncharge;
wait_on_page_writeback(page);
}
@@ -827,7 +827,7 @@ move_newpage:
*/
static int unmap_and_move_huge_page(new_page_t get_new_page,
unsigned long private, struct page *hpage,
- int force, int offlining)
+ int force, int offlining, bool sync)
{
int rc = 0;
int *result = NULL;
@@ -841,7 +841,7 @@ static int unmap_and_move_huge_page(new_page_t get_new_page,
rc = -EAGAIN;
if (!trylock_page(hpage)) {
- if (!force)
+ if (!force || !sync)
goto out;
lock_page(hpage);
}
@@ -909,7 +909,8 @@ out:
* Return: Number of pages not migrated or error code.
*/
int migrate_pages(struct list_head *from,
- new_page_t get_new_page, unsigned long private, int offlining)
+ new_page_t get_new_page, unsigned long private, int offlining,
+ bool sync)
{
int retry = 1;
int nr_failed = 0;
@@ -929,7 +930,8 @@ int migrate_pages(struct list_head *from,
cond_resched();
rc = unmap_and_move(get_new_page, private,
- page, pass > 2, offlining);
+ page, pass > 2, offlining,
+ sync);
switch(rc) {
case -ENOMEM:
@@ -958,7 +960,8 @@ out:
}
int migrate_huge_pages(struct list_head *from,
- new_page_t get_new_page, unsigned long private, int offlining)
+ new_page_t get_new_page, unsigned long private, int offlining,
+ bool sync)
{
int retry = 1;
int nr_failed = 0;
@@ -974,7 +977,8 @@ int migrate_huge_pages(struct list_head *from,
cond_resched();
rc = unmap_and_move_huge_page(get_new_page,
- private, page, pass > 2, offlining);
+ private, page, pass > 2, offlining,
+ sync);
switch(rc) {
case -ENOMEM:
@@ -1107,7 +1111,7 @@ set_status:
err = 0;
if (!list_empty(&pagelist)) {
err = migrate_pages(&pagelist, new_page_node,
- (unsigned long)pm, 0);
+ (unsigned long)pm, 0, true);
if (err)
putback_lru_pages(&pagelist);
}
diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index 03a66a3..0fd4864 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -1812,7 +1812,8 @@ static struct page *
__alloc_pages_direct_compact(gfp_t gfp_mask, unsigned int order,
struct zonelist *zonelist, enum zone_type high_zoneidx,
nodemask_t *nodemask, int alloc_flags, struct zone *preferred_zone,
- int migratetype, unsigned long *did_some_progress)
+ int migratetype, unsigned long *did_some_progress,
+ bool sync_migration)
{
struct page *page;
struct task_struct *tsk = current;
@@ -1822,7 +1823,7 @@ __alloc_pages_direct_compact(gfp_t gfp_mask, unsigned int order,
tsk->flags |= PF_MEMALLOC;
*did_some_progress = try_to_compact_pages(zonelist, order, gfp_mask,
- nodemask);
+ nodemask, sync_migration);
tsk->flags &= ~PF_MEMALLOC;
if (*did_some_progress != COMPACT_SKIPPED) {
@@ -1859,7 +1860,8 @@ static inline struct page *
__alloc_pages_direct_compact(gfp_t gfp_mask, unsigned int order,
struct zonelist *zonelist, enum zone_type high_zoneidx,
nodemask_t *nodemask, int alloc_flags, struct zone *preferred_zone,
- int migratetype, unsigned long *did_some_progress)
+ int migratetype, unsigned long *did_some_progress,
+ bool sync_migration)
{
return NULL;
}
@@ -2001,6 +2003,7 @@ __alloc_pages_slowpath(gfp_t gfp_mask, unsigned int order,
unsigned long pages_reclaimed = 0;
unsigned long did_some_progress;
struct task_struct *p = current;
+ bool sync_migration = false;
/*
* In the slowpath, we sanity check order to avoid ever trying to
@@ -2063,14 +2066,19 @@ rebalance:
if (test_thread_flag(TIF_MEMDIE) && !(gfp_mask & __GFP_NOFAIL))
goto nopage;
- /* Try direct compaction */
+ /*
+ * Try direct compaction. The first pass is asynchronous. Subsequent
+ * attempts after direct reclaim are synchronous
+ */
page = __alloc_pages_direct_compact(gfp_mask, order,
zonelist, high_zoneidx,
nodemask,
alloc_flags, preferred_zone,
- migratetype, &did_some_progress);
+ migratetype, &did_some_progress,
+ sync_migration);
if (page)
goto got_pg;
+ sync_migration = true;
/* Try direct reclaim and then allocating */
page = __alloc_pages_direct_reclaim(gfp_mask, order,
@@ -2134,7 +2142,8 @@ rebalance:
zonelist, high_zoneidx,
nodemask,
alloc_flags, preferred_zone,
- migratetype, &did_some_progress);
+ migratetype, &did_some_progress,
+ sync_migration);
if (page)
goto got_pg;
}
diff --git a/mm/vmscan.c b/mm/vmscan.c
index 10ebd74..8320d11 100644
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -2377,7 +2377,8 @@ loop_again:
* would ordinarily call try_to_compact_pages()
*/
if (sc.order > PAGE_ALLOC_COSTLY_ORDER)
- compact_zone_order(zone, sc.order, sc.gfp_mask);
+ compact_zone_order(zone, sc.order, sc.gfp_mask,
+ false);
if (!zone_watermark_ok_safe(zone, order,
high_wmark_pages(zone), end_zone, 0)) {
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