On 03/11/2015 07:30 PM, Konstantin Khlebnikov wrote:
Technically, this counter works as OOM-countdown. Let's reset it only
when zone is completely recovered and ready to handle any allocations.
Otherwise system could never recover and stuck in livelock.
Signed-off-by: Konstantin Khlebnikov <khlebnikov@xxxxxxxxxxxxxx>
Hmm, could this help in cases like this one?
https://lkml.org/lkml/2015/1/23/688
---
mm/page_alloc.c | 6 ++++--
1 file changed, 4 insertions(+), 2 deletions(-)
diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index ffd5ad2a6e10..ef7795c8c121 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -701,7 +701,8 @@ static void free_pcppages_bulk(struct zone *zone, int count,
spin_lock(&zone->lock);
nr_scanned = zone_page_state(zone, NR_PAGES_SCANNED);
- if (nr_scanned)
+ if (nr_scanned &&
+ zone_page_state(zone, NR_FREE_PAGES) > high_wmark_pages(zone))
__mod_zone_page_state(zone, NR_PAGES_SCANNED, -nr_scanned);
while (to_free) {
@@ -752,7 +753,8 @@ static void free_one_page(struct zone *zone,
unsigned long nr_scanned;
spin_lock(&zone->lock);
nr_scanned = zone_page_state(zone, NR_PAGES_SCANNED);
- if (nr_scanned)
+ if (nr_scanned &&
+ zone_page_state(zone, NR_FREE_PAGES) > high_wmark_pages(zone))
__mod_zone_page_state(zone, NR_PAGES_SCANNED, -nr_scanned);
if (unlikely(has_isolate_pageblock(zone) ||
--
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