[PATCH 11/15] mm: trigger page reclaim in alloc_contig_range() to stabilize watermarks

Marek Szyprowski
2012-01-26T09:01:09Z

alloc_contig_range() performs memory allocation so it also should keep
track on keeping the correct level of memory watermarks. This commit adds
a call to *_slowpath style reclaim to grab enough pages to make sure that
the final collection of contiguous pages from freelists will not starve
the system.

Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com>
Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>
CC: Michal Nazarewicz <mina86@mina86.com>
---
mm/page_alloc.c | 36 ++++++++++++++++++++++++++++++++++++
1 files changed, 36 insertions(+), 0 deletions(-)

diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index e35d06b..05eaa82 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -5613,6 +5613,34 @@ static int __alloc_contig_migrate_range(unsigned long start, unsigned long end)
return ret;
}

+/*
+ * Trigger memory pressure bump to reclaim some pages in order to be able to
+ * allocate 'count' pages in single page units. Does similar work as
+ *__alloc_pages_slowpath() function.
+ */
+static int __reclaim_pages(struct zone *zone, gfp_t gfp_mask, int count)
+{
+ enum zone_type high_zoneidx = gfp_zone(gfp_mask);
+ struct zonelist *zonelist = node_zonelist(0, gfp_mask);
+ int did_some_progress = 0;
+ int order = 1;
+ unsigned long watermark;
+
+ /* Obey watermarks as if the page was being allocated */
+ watermark = low_wmark_pages(zone) + count;
+ while (!zone_watermark_ok(zone, 0, watermark, 0, 0)) {
+ wake_all_kswapd(order, zonelist, high_zoneidx, zone_idx(zone));
+
+ did_some_progress = __perform_reclaim(gfp_mask, order, zonelist,
+ NULL);
+ if (!did_some_progress) {
+ /* Exhausted what can be done so it's blamo time */
+ out_of_memory(zonelist, gfp_mask, order, NULL);
+ }
+ }
+ return count;
+}
+
/**
* alloc_contig_range() -- tries to allocate given range of pages
* @start: start PFN to allocate
@@ -5707,6 +5735,14 @@ int alloc_contig_range(unsigned long start, unsigned long end,
goto done;
}

+ /*
+ * Reclaim enough pages to make sure that contiguous allocation
+ * will not starve the system.
+ */
+ __reclaim_pages(page_zone(pfn_to_page(outer_start)),
+ GFP_HIGHUSER_MOVABLE, end-start);
+
+ /* Grab isolated pages from freelists. */
outer_end = isolate_freepages_range(outer_start, end);
if (!outer_end) {
ret = -EBUSY;
--
1.7.1.569.g6f426