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Diffstat (limited to 'mm')
-rw-r--r--mm/page_alloc.c22
-rw-r--r--mm/vmscan.c7
2 files changed, 22 insertions, 7 deletions
diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index 6965be064a3..0a502e99ee2 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -1461,7 +1461,8 @@ __alloc_pages_internal(gfp_t gfp_mask, unsigned int order,
struct task_struct *p = current;
int do_retry;
int alloc_flags;
- int did_some_progress;
+ unsigned long did_some_progress;
+ unsigned long pages_reclaimed = 0;
might_sleep_if(wait);
@@ -1611,15 +1612,26 @@ nofail_alloc:
* Don't let big-order allocations loop unless the caller explicitly
* requests that. Wait for some write requests to complete then retry.
*
- * In this implementation, either order <= PAGE_ALLOC_COSTLY_ORDER or
- * __GFP_REPEAT mean __GFP_NOFAIL, but that may not be true in other
+ * In this implementation, order <= PAGE_ALLOC_COSTLY_ORDER
+ * means __GFP_NOFAIL, but that may not be true in other
* implementations.
+ *
+ * For order > PAGE_ALLOC_COSTLY_ORDER, if __GFP_REPEAT is
+ * specified, then we retry until we no longer reclaim any pages
+ * (above), or we've reclaimed an order of pages at least as
+ * large as the allocation's order. In both cases, if the
+ * allocation still fails, we stop retrying.
*/
+ pages_reclaimed += did_some_progress;
do_retry = 0;
if (!(gfp_mask & __GFP_NORETRY)) {
- if ((order <= PAGE_ALLOC_COSTLY_ORDER) ||
- (gfp_mask & __GFP_REPEAT))
+ if (order <= PAGE_ALLOC_COSTLY_ORDER) {
do_retry = 1;
+ } else {
+ if (gfp_mask & __GFP_REPEAT &&
+ pages_reclaimed < (1 << order))
+ do_retry = 1;
+ }
if (gfp_mask & __GFP_NOFAIL)
do_retry = 1;
}
diff --git a/mm/vmscan.c b/mm/vmscan.c
index eceac9f9032..12e8627c974 100644
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -1299,6 +1299,9 @@ static unsigned long shrink_zones(int priority, struct zonelist *zonelist,
* hope that some of these pages can be written. But if the allocating task
* holds filesystem locks which prevent writeout this might not work, and the
* allocation attempt will fail.
+ *
+ * returns: 0, if no pages reclaimed
+ * else, the number of pages reclaimed
*/
static unsigned long do_try_to_free_pages(struct zonelist *zonelist,
struct scan_control *sc)
@@ -1347,7 +1350,7 @@ static unsigned long do_try_to_free_pages(struct zonelist *zonelist,
}
total_scanned += sc->nr_scanned;
if (nr_reclaimed >= sc->swap_cluster_max) {
- ret = 1;
+ ret = nr_reclaimed;
goto out;
}
@@ -1370,7 +1373,7 @@ static unsigned long do_try_to_free_pages(struct zonelist *zonelist,
}
/* top priority shrink_caches still had more to do? don't OOM, then */
if (!sc->all_unreclaimable && scan_global_lru(sc))
- ret = 1;
+ ret = nr_reclaimed;
out:
/*
* Now that we've scanned all the zones at this priority level, note