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-rw-r--r--mm/compaction.c547
1 files changed, 376 insertions, 171 deletions
diff --git a/mm/compaction.c b/mm/compaction.c
index 74a8c825ff2..4ac338af512 100644
--- a/mm/compaction.c
+++ b/mm/compaction.c
@@ -16,30 +16,11 @@
#include <linux/sysfs.h>
#include "internal.h"
+#if defined CONFIG_COMPACTION || defined CONFIG_CMA
+
#define CREATE_TRACE_POINTS
#include <trace/events/compaction.h>
-/*
- * compact_control is used to track pages being migrated and the free pages
- * they are being migrated to during memory compaction. The free_pfn starts
- * at the end of a zone and migrate_pfn begins at the start. Movable pages
- * are moved to the end of a zone during a compaction run and the run
- * completes when free_pfn <= migrate_pfn
- */
-struct compact_control {
- struct list_head freepages; /* List of free pages to migrate to */
- struct list_head migratepages; /* List of pages being migrated */
- unsigned long nr_freepages; /* Number of isolated free pages */
- 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 */
-
- int order; /* order a direct compactor needs */
- int migratetype; /* MOVABLE, RECLAIMABLE etc */
- struct zone *zone;
-};
-
static unsigned long release_freepages(struct list_head *freelist)
{
struct page *page, *next;
@@ -54,24 +35,35 @@ static unsigned long release_freepages(struct list_head *freelist)
return count;
}
-/* Isolate free pages onto a private freelist. Must hold zone->lock */
-static unsigned long isolate_freepages_block(struct zone *zone,
- unsigned long blockpfn,
- struct list_head *freelist)
+static void map_pages(struct list_head *list)
+{
+ struct page *page;
+
+ list_for_each_entry(page, list, lru) {
+ arch_alloc_page(page, 0);
+ kernel_map_pages(page, 1, 1);
+ }
+}
+
+static inline bool migrate_async_suitable(int migratetype)
+{
+ return is_migrate_cma(migratetype) || migratetype == MIGRATE_MOVABLE;
+}
+
+/*
+ * Isolate free pages onto a private freelist. Caller must hold zone->lock.
+ * If @strict is true, will abort returning 0 on any invalid PFNs or non-free
+ * pages inside of the pageblock (even though it may still end up isolating
+ * some pages).
+ */
+static unsigned long isolate_freepages_block(unsigned long blockpfn,
+ unsigned long end_pfn,
+ struct list_head *freelist,
+ bool strict)
{
- unsigned long zone_end_pfn, end_pfn;
int nr_scanned = 0, total_isolated = 0;
struct page *cursor;
- /* Get the last PFN we should scan for free pages at */
- zone_end_pfn = zone->zone_start_pfn + zone->spanned_pages;
- end_pfn = min(blockpfn + pageblock_nr_pages, zone_end_pfn);
-
- /* Find the first usable PFN in the block to initialse page cursor */
- for (; blockpfn < end_pfn; blockpfn++) {
- if (pfn_valid_within(blockpfn))
- break;
- }
cursor = pfn_to_page(blockpfn);
/* Isolate free pages. This assumes the block is valid */
@@ -79,15 +71,23 @@ static unsigned long isolate_freepages_block(struct zone *zone,
int isolated, i;
struct page *page = cursor;
- if (!pfn_valid_within(blockpfn))
+ if (!pfn_valid_within(blockpfn)) {
+ if (strict)
+ return 0;
continue;
+ }
nr_scanned++;
- if (!PageBuddy(page))
+ if (!PageBuddy(page)) {
+ if (strict)
+ return 0;
continue;
+ }
/* Found a free page, break it into order-0 pages */
isolated = split_free_page(page);
+ if (!isolated && strict)
+ return 0;
total_isolated += isolated;
for (i = 0; i < isolated; i++) {
list_add(&page->lru, freelist);
@@ -105,114 +105,71 @@ static unsigned long isolate_freepages_block(struct zone *zone,
return total_isolated;
}
-/* Returns true if the page is within a block suitable for migration to */
-static bool suitable_migration_target(struct page *page)
-{
-
- int migratetype = get_pageblock_migratetype(page);
-
- /* Don't interfere with memory hot-remove or the min_free_kbytes blocks */
- if (migratetype == MIGRATE_ISOLATE || migratetype == MIGRATE_RESERVE)
- return false;
-
- /* If the page is a large free page, then allow migration */
- if (PageBuddy(page) && page_order(page) >= pageblock_order)
- return true;
-
- /* If the block is MIGRATE_MOVABLE, allow migration */
- if (migratetype == MIGRATE_MOVABLE)
- return true;
-
- /* Otherwise skip the block */
- return false;
-}
-
-/*
- * Based on information in the current compact_control, find blocks
- * suitable for isolating free pages from and then isolate them.
+/**
+ * isolate_freepages_range() - isolate free pages.
+ * @start_pfn: The first PFN to start isolating.
+ * @end_pfn: The one-past-last PFN.
+ *
+ * Non-free pages, invalid PFNs, or zone boundaries within the
+ * [start_pfn, end_pfn) range are considered errors, cause function to
+ * undo its actions and return zero.
+ *
+ * Otherwise, function returns one-past-the-last PFN of isolated page
+ * (which may be greater then end_pfn if end fell in a middle of
+ * a free page).
*/
-static void isolate_freepages(struct zone *zone,
- struct compact_control *cc)
+unsigned long
+isolate_freepages_range(unsigned long start_pfn, unsigned long end_pfn)
{
- struct page *page;
- unsigned long high_pfn, low_pfn, pfn;
- unsigned long flags;
- int nr_freepages = cc->nr_freepages;
- struct list_head *freelist = &cc->freepages;
-
- /*
- * Initialise the free scanner. The starting point is where we last
- * scanned from (or the end of the zone if starting). The low point
- * is the end of the pageblock the migration scanner is using.
- */
- pfn = cc->free_pfn;
- low_pfn = cc->migrate_pfn + pageblock_nr_pages;
+ unsigned long isolated, pfn, block_end_pfn, flags;
+ struct zone *zone = NULL;
+ LIST_HEAD(freelist);
- /*
- * Take care that if the migration scanner is at the end of the zone
- * that the free scanner does not accidentally move to the next zone
- * in the next isolation cycle.
- */
- high_pfn = min(low_pfn, pfn);
+ if (pfn_valid(start_pfn))
+ zone = page_zone(pfn_to_page(start_pfn));
- /*
- * Isolate free pages until enough are available to migrate the
- * pages on cc->migratepages. We stop searching if the migrate
- * and free page scanners meet or enough free pages are isolated.
- */
- for (; pfn > low_pfn && cc->nr_migratepages > nr_freepages;
- pfn -= pageblock_nr_pages) {
- unsigned long isolated;
-
- if (!pfn_valid(pfn))
- continue;
+ for (pfn = start_pfn; pfn < end_pfn; pfn += isolated) {
+ if (!pfn_valid(pfn) || zone != page_zone(pfn_to_page(pfn)))
+ break;
/*
- * Check for overlapping nodes/zones. It's possible on some
- * configurations to have a setup like
- * node0 node1 node0
- * i.e. it's possible that all pages within a zones range of
- * pages do not belong to a single zone.
+ * On subsequent iterations ALIGN() is actually not needed,
+ * but we keep it that we not to complicate the code.
*/
- page = pfn_to_page(pfn);
- if (page_zone(page) != zone)
- continue;
+ block_end_pfn = ALIGN(pfn + 1, pageblock_nr_pages);
+ block_end_pfn = min(block_end_pfn, end_pfn);
- /* Check the block is suitable for migration */
- if (!suitable_migration_target(page))
- continue;
+ spin_lock_irqsave(&zone->lock, flags);
+ isolated = isolate_freepages_block(pfn, block_end_pfn,
+ &freelist, true);
+ spin_unlock_irqrestore(&zone->lock, flags);
/*
- * Found a block suitable for isolating free pages from. Now
- * we disabled interrupts, double check things are ok and
- * isolate the pages. This is to minimise the time IRQs
- * are disabled
+ * In strict mode, isolate_freepages_block() returns 0 if
+ * there are any holes in the block (ie. invalid PFNs or
+ * non-free pages).
*/
- isolated = 0;
- spin_lock_irqsave(&zone->lock, flags);
- if (suitable_migration_target(page)) {
- isolated = isolate_freepages_block(zone, pfn, freelist);
- nr_freepages += isolated;
- }
- spin_unlock_irqrestore(&zone->lock, flags);
+ if (!isolated)
+ break;
/*
- * Record the highest PFN we isolated pages from. When next
- * looking for free pages, the search will restart here as
- * page migration may have returned some pages to the allocator
+ * If we managed to isolate pages, it is always (1 << n) *
+ * pageblock_nr_pages for some non-negative n. (Max order
+ * page may span two pageblocks).
*/
- if (isolated)
- high_pfn = max(high_pfn, pfn);
}
/* split_free_page does not map the pages */
- list_for_each_entry(page, freelist, lru) {
- arch_alloc_page(page, 0);
- kernel_map_pages(page, 1, 1);
+ map_pages(&freelist);
+
+ if (pfn < end_pfn) {
+ /* Loop terminated early, cleanup. */
+ release_freepages(&freelist);
+ return 0;
}
- cc->free_pfn = high_pfn;
- cc->nr_freepages = nr_freepages;
+ /* We don't use freelists for anything. */
+ return pfn;
}
/* Update the number of anon and file isolated pages in the zone */
@@ -243,37 +200,34 @@ static bool too_many_isolated(struct zone *zone)
return isolated > (inactive + active) / 2;
}
-/* possible outcome of isolate_migratepages */
-typedef enum {
- ISOLATE_ABORT, /* Abort compaction now */
- ISOLATE_NONE, /* No pages isolated, continue scanning */
- ISOLATE_SUCCESS, /* Pages isolated, migrate */
-} isolate_migrate_t;
-
-/*
- * Isolate all pages that can be migrated from the block pointed to by
- * the migrate scanner within compact_control.
+/**
+ * isolate_migratepages_range() - isolate all migrate-able pages in range.
+ * @zone: Zone pages are in.
+ * @cc: Compaction control structure.
+ * @low_pfn: The first PFN of the range.
+ * @end_pfn: The one-past-the-last PFN of the range.
+ *
+ * Isolate all pages that can be migrated from the range specified by
+ * [low_pfn, end_pfn). Returns zero if there is a fatal signal
+ * pending), otherwise PFN of the first page that was not scanned
+ * (which may be both less, equal to or more then end_pfn).
+ *
+ * Assumes that cc->migratepages is empty and cc->nr_migratepages is
+ * zero.
+ *
+ * Apart from cc->migratepages and cc->nr_migratetypes this function
+ * does not modify any cc's fields, in particular it does not modify
+ * (or read for that matter) cc->migrate_pfn.
*/
-static isolate_migrate_t isolate_migratepages(struct zone *zone,
- struct compact_control *cc)
+unsigned long
+isolate_migratepages_range(struct zone *zone, struct compact_control *cc,
+ unsigned long low_pfn, unsigned long end_pfn)
{
- unsigned long low_pfn, end_pfn;
unsigned long last_pageblock_nr = 0, pageblock_nr;
unsigned long nr_scanned = 0, nr_isolated = 0;
struct list_head *migratelist = &cc->migratepages;
- isolate_mode_t mode = ISOLATE_ACTIVE|ISOLATE_INACTIVE;
-
- /* Do not scan outside zone boundaries */
- low_pfn = max(cc->migrate_pfn, zone->zone_start_pfn);
-
- /* Only scan within a pageblock boundary */
- end_pfn = ALIGN(low_pfn + pageblock_nr_pages, pageblock_nr_pages);
-
- /* Do not cross the free scanner or scan within a memory hole */
- if (end_pfn > cc->free_pfn || !pfn_valid(low_pfn)) {
- cc->migrate_pfn = end_pfn;
- return ISOLATE_NONE;
- }
+ isolate_mode_t mode = 0;
+ struct lruvec *lruvec;
/*
* Ensure that there are not too many pages isolated from the LRU
@@ -282,13 +236,13 @@ static isolate_migrate_t isolate_migratepages(struct zone *zone,
*/
while (unlikely(too_many_isolated(zone))) {
/* async migration should just abort */
- if (!cc->sync)
- return ISOLATE_ABORT;
+ if (cc->mode != COMPACT_SYNC)
+ return 0;
congestion_wait(BLK_RW_ASYNC, HZ/10);
if (fatal_signal_pending(current))
- return ISOLATE_ABORT;
+ return 0;
}
/* Time to isolate some pages for migration */
@@ -350,8 +304,9 @@ static isolate_migrate_t isolate_migratepages(struct zone *zone,
* satisfies the allocation
*/
pageblock_nr = low_pfn >> pageblock_order;
- if (!cc->sync && last_pageblock_nr != pageblock_nr &&
- get_pageblock_migratetype(page) != MIGRATE_MOVABLE) {
+ if (cc->mode != COMPACT_SYNC &&
+ last_pageblock_nr != pageblock_nr &&
+ !migrate_async_suitable(get_pageblock_migratetype(page))) {
low_pfn += pageblock_nr_pages;
low_pfn = ALIGN(low_pfn, pageblock_nr_pages) - 1;
last_pageblock_nr = pageblock_nr;
@@ -371,17 +326,19 @@ static isolate_migrate_t isolate_migratepages(struct zone *zone,
continue;
}
- if (!cc->sync)
+ if (cc->mode != COMPACT_SYNC)
mode |= ISOLATE_ASYNC_MIGRATE;
+ lruvec = mem_cgroup_page_lruvec(page, zone);
+
/* Try isolate the page */
- if (__isolate_lru_page(page, mode, 0) != 0)
+ if (__isolate_lru_page(page, mode) != 0)
continue;
VM_BUG_ON(PageTransCompound(page));
/* Successfully isolated */
- del_page_from_lru_list(zone, page, page_lru(page));
+ del_page_from_lru_list(page, lruvec, page_lru(page));
list_add(&page->lru, migratelist);
cc->nr_migratepages++;
nr_isolated++;
@@ -396,11 +353,200 @@ static isolate_migrate_t isolate_migratepages(struct zone *zone,
acct_isolated(zone, cc);
spin_unlock_irq(&zone->lru_lock);
- cc->migrate_pfn = low_pfn;
trace_mm_compaction_isolate_migratepages(nr_scanned, nr_isolated);
- return ISOLATE_SUCCESS;
+ return low_pfn;
+}
+
+#endif /* CONFIG_COMPACTION || CONFIG_CMA */
+#ifdef CONFIG_COMPACTION
+/*
+ * Returns true if MIGRATE_UNMOVABLE pageblock was successfully
+ * converted to MIGRATE_MOVABLE type, false otherwise.
+ */
+static bool rescue_unmovable_pageblock(struct page *page)
+{
+ unsigned long pfn, start_pfn, end_pfn;
+ struct page *start_page, *end_page;
+
+ pfn = page_to_pfn(page);
+ start_pfn = pfn & ~(pageblock_nr_pages - 1);
+ end_pfn = start_pfn + pageblock_nr_pages;
+
+ start_page = pfn_to_page(start_pfn);
+ end_page = pfn_to_page(end_pfn);
+
+ /* Do not deal with pageblocks that overlap zones */
+ if (page_zone(start_page) != page_zone(end_page))
+ return false;
+
+ for (page = start_page, pfn = start_pfn; page < end_page; pfn++,
+ page++) {
+ if (!pfn_valid_within(pfn))
+ continue;
+
+ if (PageBuddy(page)) {
+ int order = page_order(page);
+
+ pfn += (1 << order) - 1;
+ page += (1 << order) - 1;
+
+ continue;
+ } else if (page_count(page) == 0 || PageLRU(page))
+ continue;
+
+ return false;
+ }
+
+ set_pageblock_migratetype(page, MIGRATE_MOVABLE);
+ move_freepages_block(page_zone(page), page, MIGRATE_MOVABLE);
+ return true;
+}
+
+enum smt_result {
+ GOOD_AS_MIGRATION_TARGET,
+ FAIL_UNMOVABLE_TARGET,
+ FAIL_BAD_TARGET,
+};
+
+/*
+ * Returns GOOD_AS_MIGRATION_TARGET if the page is within a block
+ * suitable for migration to, FAIL_UNMOVABLE_TARGET if the page
+ * is within a MIGRATE_UNMOVABLE block, FAIL_BAD_TARGET otherwise.
+ */
+static enum smt_result suitable_migration_target(struct page *page,
+ struct compact_control *cc)
+{
+
+ int migratetype = get_pageblock_migratetype(page);
+
+ /* Don't interfere with memory hot-remove or the min_free_kbytes blocks */
+ if (migratetype == MIGRATE_ISOLATE || migratetype == MIGRATE_RESERVE)
+ return FAIL_BAD_TARGET;
+
+ /* If the page is a large free page, then allow migration */
+ if (PageBuddy(page) && page_order(page) >= pageblock_order)
+ return GOOD_AS_MIGRATION_TARGET;
+
+ /* If the block is MIGRATE_MOVABLE or MIGRATE_CMA, allow migration */
+ if (cc->mode != COMPACT_ASYNC_UNMOVABLE &&
+ migrate_async_suitable(migratetype))
+ return GOOD_AS_MIGRATION_TARGET;
+
+ if (cc->mode == COMPACT_ASYNC_MOVABLE &&
+ migratetype == MIGRATE_UNMOVABLE)
+ return FAIL_UNMOVABLE_TARGET;
+
+ if (cc->mode != COMPACT_ASYNC_MOVABLE &&
+ migratetype == MIGRATE_UNMOVABLE &&
+ rescue_unmovable_pageblock(page))
+ return GOOD_AS_MIGRATION_TARGET;
+
+ /* Otherwise skip the block */
+ return FAIL_BAD_TARGET;
+}
+
+/*
+ * Based on information in the current compact_control, find blocks
+ * suitable for isolating free pages from and then isolate them.
+ */
+static void isolate_freepages(struct zone *zone,
+ struct compact_control *cc)
+{
+ struct page *page;
+ unsigned long high_pfn, low_pfn, pfn, zone_end_pfn, end_pfn;
+ unsigned long flags;
+ int nr_freepages = cc->nr_freepages;
+ struct list_head *freelist = &cc->freepages;
+
+ /*
+ * Initialise the free scanner. The starting point is where we last
+ * scanned from (or the end of the zone if starting). The low point
+ * is the end of the pageblock the migration scanner is using.
+ */
+ pfn = cc->free_pfn;
+ low_pfn = cc->migrate_pfn + pageblock_nr_pages;
+
+ /*
+ * Take care that if the migration scanner is at the end of the zone
+ * that the free scanner does not accidentally move to the next zone
+ * in the next isolation cycle.
+ */
+ high_pfn = min(low_pfn, pfn);
+
+ zone_end_pfn = zone->zone_start_pfn + zone->spanned_pages;
+
+ /*
+ * isolate_freepages() may be called more than once during
+ * compact_zone_order() run and we want only the most recent
+ * count.
+ */
+ cc->nr_pageblocks_skipped = 0;
+
+ /*
+ * Isolate free pages until enough are available to migrate the
+ * pages on cc->migratepages. We stop searching if the migrate
+ * and free page scanners meet or enough free pages are isolated.
+ */
+ for (; pfn > low_pfn && cc->nr_migratepages > nr_freepages;
+ pfn -= pageblock_nr_pages) {
+ unsigned long isolated;
+ enum smt_result ret;
+
+ if (!pfn_valid(pfn))
+ continue;
+
+ /*
+ * Check for overlapping nodes/zones. It's possible on some
+ * configurations to have a setup like
+ * node0 node1 node0
+ * i.e. it's possible that all pages within a zones range of
+ * pages do not belong to a single zone.
+ */
+ page = pfn_to_page(pfn);
+ if (page_zone(page) != zone)
+ continue;
+
+ /* Check the block is suitable for migration */
+ ret = suitable_migration_target(page, cc);
+ if (ret != GOOD_AS_MIGRATION_TARGET) {
+ if (ret == FAIL_UNMOVABLE_TARGET)
+ cc->nr_pageblocks_skipped++;
+ continue;
+ }
+ /*
+ * Found a block suitable for isolating free pages from. Now
+ * we disabled interrupts, double check things are ok and
+ * isolate the pages. This is to minimise the time IRQs
+ * are disabled
+ */
+ isolated = 0;
+ spin_lock_irqsave(&zone->lock, flags);
+ ret = suitable_migration_target(page, cc);
+ if (ret == GOOD_AS_MIGRATION_TARGET) {
+ end_pfn = min(pfn + pageblock_nr_pages, zone_end_pfn);
+ isolated = isolate_freepages_block(pfn, end_pfn,
+ freelist, false);
+ nr_freepages += isolated;
+ } else if (ret == FAIL_UNMOVABLE_TARGET)
+ cc->nr_pageblocks_skipped++;
+ spin_unlock_irqrestore(&zone->lock, flags);
+
+ /*
+ * Record the highest PFN we isolated pages from. When next
+ * looking for free pages, the search will restart here as
+ * page migration may have returned some pages to the allocator
+ */
+ if (isolated)
+ high_pfn = max(high_pfn, pfn);
+ }
+
+ /* split_free_page does not map the pages */
+ map_pages(freelist);
+
+ cc->free_pfn = high_pfn;
+ cc->nr_freepages = nr_freepages;
}
/*
@@ -449,6 +595,44 @@ static void update_nr_listpages(struct compact_control *cc)
cc->nr_freepages = nr_freepages;
}
+/* possible outcome of isolate_migratepages */
+typedef enum {
+ ISOLATE_ABORT, /* Abort compaction now */
+ ISOLATE_NONE, /* No pages isolated, continue scanning */
+ ISOLATE_SUCCESS, /* Pages isolated, migrate */
+} isolate_migrate_t;
+
+/*
+ * Isolate all pages that can be migrated from the block pointed to by
+ * the migrate scanner within compact_control.
+ */
+static isolate_migrate_t isolate_migratepages(struct zone *zone,
+ struct compact_control *cc)
+{
+ unsigned long low_pfn, end_pfn;
+
+ /* Do not scan outside zone boundaries */
+ low_pfn = max(cc->migrate_pfn, zone->zone_start_pfn);
+
+ /* Only scan within a pageblock boundary */
+ end_pfn = ALIGN(low_pfn + pageblock_nr_pages, pageblock_nr_pages);
+
+ /* Do not cross the free scanner or scan within a memory hole */
+ if (end_pfn > cc->free_pfn || !pfn_valid(low_pfn)) {
+ cc->migrate_pfn = end_pfn;
+ return ISOLATE_NONE;
+ }
+
+ /* Perform the isolation */
+ low_pfn = isolate_migratepages_range(zone, cc, low_pfn, end_pfn);
+ if (!low_pfn)
+ return ISOLATE_ABORT;
+
+ cc->migrate_pfn = low_pfn;
+
+ return ISOLATE_SUCCESS;
+}
+
static int compact_finished(struct zone *zone,
struct compact_control *cc)
{
@@ -578,8 +762,9 @@ static int compact_zone(struct zone *zone, struct compact_control *cc)
nr_migrate = cc->nr_migratepages;
err = migrate_pages(&cc->migratepages, compaction_alloc,
- (unsigned long)cc, false,
- cc->sync ? MIGRATE_SYNC_LIGHT : MIGRATE_ASYNC);
+ (unsigned long)&cc->freepages, false,
+ (cc->mode == COMPACT_SYNC) ? MIGRATE_SYNC_LIGHT
+ : MIGRATE_ASYNC);
update_nr_listpages(cc);
nr_remaining = cc->nr_migratepages;
@@ -608,7 +793,8 @@ out:
static unsigned long compact_zone_order(struct zone *zone,
int order, gfp_t gfp_mask,
- bool sync)
+ enum compact_mode mode,
+ unsigned long *nr_pageblocks_skipped)
{
struct compact_control cc = {
.nr_freepages = 0,
@@ -616,12 +802,17 @@ static unsigned long compact_zone_order(struct zone *zone,
.order = order,
.migratetype = allocflags_to_migratetype(gfp_mask),
.zone = zone,
- .sync = sync,
+ .mode = mode,
};
+ unsigned long rc;
+
INIT_LIST_HEAD(&cc.freepages);
INIT_LIST_HEAD(&cc.migratepages);
- return compact_zone(zone, &cc);
+ rc = compact_zone(zone, &cc);
+ *nr_pageblocks_skipped = cc.nr_pageblocks_skipped;
+
+ return rc;
}
int sysctl_extfrag_threshold = 500;
@@ -646,6 +837,8 @@ unsigned long try_to_compact_pages(struct zonelist *zonelist,
struct zoneref *z;
struct zone *zone;
int rc = COMPACT_SKIPPED;
+ unsigned long nr_pageblocks_skipped;
+ enum compact_mode mode;
/*
* Check whether it is worth even starting compaction. The order check is
@@ -662,12 +855,22 @@ unsigned long try_to_compact_pages(struct zonelist *zonelist,
nodemask) {
int status;
- status = compact_zone_order(zone, order, gfp_mask, sync);
+ mode = sync ? COMPACT_SYNC : COMPACT_ASYNC_MOVABLE;
+retry:
+ status = compact_zone_order(zone, order, gfp_mask, mode,
+ &nr_pageblocks_skipped);
rc = max(status, rc);
/* If a normal allocation would succeed, stop compacting */
if (zone_watermark_ok(zone, order, low_wmark_pages(zone), 0, 0))
break;
+
+ if (rc == COMPACT_COMPLETE && mode == COMPACT_ASYNC_MOVABLE) {
+ if (nr_pageblocks_skipped) {
+ mode = COMPACT_ASYNC_UNMOVABLE;
+ goto retry;
+ }
+ }
}
return rc;
@@ -701,7 +904,7 @@ static int __compact_pgdat(pg_data_t *pgdat, struct compact_control *cc)
if (ok && cc->order > zone->compact_order_failed)
zone->compact_order_failed = cc->order + 1;
/* Currently async compaction is never deferred. */
- else if (!ok && cc->sync)
+ else if (!ok && cc->mode == COMPACT_SYNC)
defer_compaction(zone, cc->order);
}
@@ -716,7 +919,7 @@ int compact_pgdat(pg_data_t *pgdat, int order)
{
struct compact_control cc = {
.order = order,
- .sync = false,
+ .mode = COMPACT_ASYNC_MOVABLE,
};
return __compact_pgdat(pgdat, &cc);
@@ -726,7 +929,7 @@ static int compact_node(int nid)
{
struct compact_control cc = {
.order = -1,
- .sync = true,
+ .mode = COMPACT_SYNC,
};
return __compact_pgdat(NODE_DATA(nid), &cc);
@@ -795,3 +998,5 @@ void compaction_unregister_node(struct node *node)
return device_remove_file(&node->dev, &dev_attr_compact);
}
#endif /* CONFIG_SYSFS && CONFIG_NUMA */
+
+#endif /* CONFIG_COMPACTION */