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-rw-r--r--mm/vmscan.c120
1 files changed, 75 insertions, 45 deletions
diff --git a/mm/vmscan.c b/mm/vmscan.c
index 399d54e8a82..d9fc2dce93a 100644
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -51,6 +51,12 @@
#define CREATE_TRACE_POINTS
#include <trace/events/vmscan.h>
+enum lumpy_mode {
+ LUMPY_MODE_NONE,
+ LUMPY_MODE_ASYNC,
+ LUMPY_MODE_SYNC,
+};
+
struct scan_control {
/* Incremented by the number of inactive pages that were scanned */
unsigned long nr_scanned;
@@ -82,7 +88,7 @@ struct scan_control {
* Intend to reclaim enough continuous memory rather than reclaim
* enough amount of memory. i.e, mode for high order allocation.
*/
- bool lumpy_reclaim_mode;
+ enum lumpy_mode lumpy_reclaim_mode;
/* Which cgroup do we reclaim from */
struct mem_cgroup *mem_cgroup;
@@ -265,6 +271,36 @@ unsigned long shrink_slab(unsigned long scanned, gfp_t gfp_mask,
return ret;
}
+static void set_lumpy_reclaim_mode(int priority, struct scan_control *sc,
+ bool sync)
+{
+ enum lumpy_mode mode = sync ? LUMPY_MODE_SYNC : LUMPY_MODE_ASYNC;
+
+ /*
+ * Some reclaim have alredy been failed. No worth to try synchronous
+ * lumpy reclaim.
+ */
+ if (sync && sc->lumpy_reclaim_mode == LUMPY_MODE_NONE)
+ return;
+
+ /*
+ * If we need a large contiguous chunk of memory, or have
+ * trouble getting a small set of contiguous pages, we
+ * will reclaim both active and inactive pages.
+ */
+ if (sc->order > PAGE_ALLOC_COSTLY_ORDER)
+ sc->lumpy_reclaim_mode = mode;
+ else if (sc->order && priority < DEF_PRIORITY - 2)
+ sc->lumpy_reclaim_mode = mode;
+ else
+ sc->lumpy_reclaim_mode = LUMPY_MODE_NONE;
+}
+
+static void disable_lumpy_reclaim_mode(struct scan_control *sc)
+{
+ sc->lumpy_reclaim_mode = LUMPY_MODE_NONE;
+}
+
static inline int is_page_cache_freeable(struct page *page)
{
/*
@@ -275,7 +311,8 @@ static inline int is_page_cache_freeable(struct page *page)
return page_count(page) - page_has_private(page) == 2;
}
-static int may_write_to_queue(struct backing_dev_info *bdi)
+static int may_write_to_queue(struct backing_dev_info *bdi,
+ struct scan_control *sc)
{
if (current->flags & PF_SWAPWRITE)
return 1;
@@ -283,6 +320,10 @@ static int may_write_to_queue(struct backing_dev_info *bdi)
return 1;
if (bdi == current->backing_dev_info)
return 1;
+
+ /* lumpy reclaim for hugepage often need a lot of write */
+ if (sc->order > PAGE_ALLOC_COSTLY_ORDER)
+ return 1;
return 0;
}
@@ -307,12 +348,6 @@ static void handle_write_error(struct address_space *mapping,
unlock_page(page);
}
-/* Request for sync pageout. */
-enum pageout_io {
- PAGEOUT_IO_ASYNC,
- PAGEOUT_IO_SYNC,
-};
-
/* possible outcome of pageout() */
typedef enum {
/* failed to write page out, page is locked */
@@ -330,7 +365,7 @@ typedef enum {
* Calls ->writepage().
*/
static pageout_t pageout(struct page *page, struct address_space *mapping,
- enum pageout_io sync_writeback)
+ struct scan_control *sc)
{
/*
* If the page is dirty, only perform writeback if that write
@@ -366,8 +401,10 @@ static pageout_t pageout(struct page *page, struct address_space *mapping,
}
if (mapping->a_ops->writepage == NULL)
return PAGE_ACTIVATE;
- if (!may_write_to_queue(mapping->backing_dev_info))
+ if (!may_write_to_queue(mapping->backing_dev_info, sc)) {
+ disable_lumpy_reclaim_mode(sc);
return PAGE_KEEP;
+ }
if (clear_page_dirty_for_io(page)) {
int res;
@@ -393,7 +430,8 @@ static pageout_t pageout(struct page *page, struct address_space *mapping,
* direct reclaiming a large contiguous area and the
* first attempt to free a range of pages fails.
*/
- if (PageWriteback(page) && sync_writeback == PAGEOUT_IO_SYNC)
+ if (PageWriteback(page) &&
+ sc->lumpy_reclaim_mode == LUMPY_MODE_SYNC)
wait_on_page_writeback(page);
if (!PageWriteback(page)) {
@@ -401,7 +439,7 @@ static pageout_t pageout(struct page *page, struct address_space *mapping,
ClearPageReclaim(page);
}
trace_mm_vmscan_writepage(page,
- trace_reclaim_flags(page, sync_writeback));
+ trace_reclaim_flags(page, sc->lumpy_reclaim_mode));
inc_zone_page_state(page, NR_VMSCAN_WRITE);
return PAGE_SUCCESS;
}
@@ -579,7 +617,7 @@ static enum page_references page_check_references(struct page *page,
referenced_page = TestClearPageReferenced(page);
/* Lumpy reclaim - ignore references */
- if (sc->lumpy_reclaim_mode)
+ if (sc->lumpy_reclaim_mode != LUMPY_MODE_NONE)
return PAGEREF_RECLAIM;
/*
@@ -643,8 +681,7 @@ static noinline_for_stack void free_page_list(struct list_head *free_pages)
* shrink_page_list() returns the number of reclaimed pages
*/
static unsigned long shrink_page_list(struct list_head *page_list,
- struct scan_control *sc,
- enum pageout_io sync_writeback)
+ struct scan_control *sc)
{
LIST_HEAD(ret_pages);
LIST_HEAD(free_pages);
@@ -693,10 +730,13 @@ static unsigned long shrink_page_list(struct list_head *page_list,
* for any page for which writeback has already
* started.
*/
- if (sync_writeback == PAGEOUT_IO_SYNC && may_enter_fs)
+ if (sc->lumpy_reclaim_mode == LUMPY_MODE_SYNC &&
+ may_enter_fs)
wait_on_page_writeback(page);
- else
- goto keep_locked;
+ else {
+ unlock_page(page);
+ goto keep_lumpy;
+ }
}
references = page_check_references(page, sc);
@@ -750,14 +790,17 @@ static unsigned long shrink_page_list(struct list_head *page_list,
goto keep_locked;
/* Page is dirty, try to write it out here */
- switch (pageout(page, mapping, sync_writeback)) {
+ switch (pageout(page, mapping, sc)) {
case PAGE_KEEP:
goto keep_locked;
case PAGE_ACTIVATE:
goto activate_locked;
case PAGE_SUCCESS:
- if (PageWriteback(page) || PageDirty(page))
+ if (PageWriteback(page))
+ goto keep_lumpy;
+ if (PageDirty(page))
goto keep;
+
/*
* A synchronous write - probably a ramdisk. Go
* ahead and try to reclaim the page.
@@ -840,6 +883,7 @@ cull_mlocked:
try_to_free_swap(page);
unlock_page(page);
putback_lru_page(page);
+ disable_lumpy_reclaim_mode(sc);
continue;
activate_locked:
@@ -852,6 +896,8 @@ activate_locked:
keep_locked:
unlock_page(page);
keep:
+ disable_lumpy_reclaim_mode(sc);
+keep_lumpy:
list_add(&page->lru, &ret_pages);
VM_BUG_ON(PageLRU(page) || PageUnevictable(page));
}
@@ -1252,7 +1298,7 @@ static inline bool should_reclaim_stall(unsigned long nr_taken,
return false;
/* Only stall on lumpy reclaim */
- if (!sc->lumpy_reclaim_mode)
+ if (sc->lumpy_reclaim_mode == LUMPY_MODE_NONE)
return false;
/* If we have relaimed everything on the isolated list, no stall */
@@ -1297,15 +1343,15 @@ shrink_inactive_list(unsigned long nr_to_scan, struct zone *zone,
return SWAP_CLUSTER_MAX;
}
-
+ set_lumpy_reclaim_mode(priority, sc, false);
lru_add_drain();
spin_lock_irq(&zone->lru_lock);
if (scanning_global_lru(sc)) {
nr_taken = isolate_pages_global(nr_to_scan,
&page_list, &nr_scanned, sc->order,
- sc->lumpy_reclaim_mode ?
- ISOLATE_BOTH : ISOLATE_INACTIVE,
+ sc->lumpy_reclaim_mode == LUMPY_MODE_NONE ?
+ ISOLATE_INACTIVE : ISOLATE_BOTH,
zone, 0, file);
zone->pages_scanned += nr_scanned;
if (current_is_kswapd())
@@ -1317,8 +1363,8 @@ shrink_inactive_list(unsigned long nr_to_scan, struct zone *zone,
} else {
nr_taken = mem_cgroup_isolate_pages(nr_to_scan,
&page_list, &nr_scanned, sc->order,
- sc->lumpy_reclaim_mode ?
- ISOLATE_BOTH : ISOLATE_INACTIVE,
+ sc->lumpy_reclaim_mode == LUMPY_MODE_NONE ?
+ ISOLATE_INACTIVE : ISOLATE_BOTH,
zone, sc->mem_cgroup,
0, file);
/*
@@ -1336,7 +1382,7 @@ shrink_inactive_list(unsigned long nr_to_scan, struct zone *zone,
spin_unlock_irq(&zone->lru_lock);
- nr_reclaimed = shrink_page_list(&page_list, sc, PAGEOUT_IO_ASYNC);
+ nr_reclaimed = shrink_page_list(&page_list, sc);
/* Check if we should syncronously wait for writeback */
if (should_reclaim_stall(nr_taken, nr_reclaimed, priority, sc)) {
@@ -1347,7 +1393,8 @@ shrink_inactive_list(unsigned long nr_to_scan, struct zone *zone,
nr_active = clear_active_flags(&page_list, NULL);
count_vm_events(PGDEACTIVATE, nr_active);
- nr_reclaimed += shrink_page_list(&page_list, sc, PAGEOUT_IO_SYNC);
+ set_lumpy_reclaim_mode(priority, sc, true);
+ nr_reclaimed += shrink_page_list(&page_list, sc);
}
local_irq_disable();
@@ -1739,21 +1786,6 @@ out:
}
}
-static void set_lumpy_reclaim_mode(int priority, struct scan_control *sc)
-{
- /*
- * If we need a large contiguous chunk of memory, or have
- * trouble getting a small set of contiguous pages, we
- * will reclaim both active and inactive pages.
- */
- if (sc->order > PAGE_ALLOC_COSTLY_ORDER)
- sc->lumpy_reclaim_mode = 1;
- else if (sc->order && priority < DEF_PRIORITY - 2)
- sc->lumpy_reclaim_mode = 1;
- else
- sc->lumpy_reclaim_mode = 0;
-}
-
/*
* This is a basic per-zone page freer. Used by both kswapd and direct reclaim.
*/
@@ -1768,8 +1800,6 @@ static void shrink_zone(int priority, struct zone *zone,
get_scan_count(zone, sc, nr, priority);
- set_lumpy_reclaim_mode(priority, sc);
-
while (nr[LRU_INACTIVE_ANON] || nr[LRU_ACTIVE_FILE] ||
nr[LRU_INACTIVE_FILE]) {
for_each_evictable_lru(l) {