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-rw-r--r--mm/page_alloc.c24
1 files changed, 19 insertions, 5 deletions
diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index d4096f4a5c1f..7e5e775e97f4 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -2507,10 +2507,6 @@ void drain_all_pages(struct zone *zone)
if (WARN_ON_ONCE(!mm_percpu_wq))
return;
- /* Workqueues cannot recurse */
- if (current->flags & PF_WQ_WORKER)
- return;
-
/*
* Do not drain if one is already in progress unless it's specific to
* a zone. Such callers are primarily CMA and memory hotplug and need
@@ -2688,6 +2684,7 @@ void free_unref_page_list(struct list_head *list)
{
struct page *page, *next;
unsigned long flags, pfn;
+ int batch_count = 0;
/* Prepare pages for freeing */
list_for_each_entry_safe(page, next, list, lru) {
@@ -2704,6 +2701,16 @@ void free_unref_page_list(struct list_head *list)
set_page_private(page, 0);
trace_mm_page_free_batched(page);
free_unref_page_commit(page, pfn);
+
+ /*
+ * Guard against excessive IRQ disabled times when we get
+ * a large list of pages to free.
+ */
+ if (++batch_count == SWAP_CLUSTER_MAX) {
+ local_irq_restore(flags);
+ batch_count = 0;
+ local_irq_save(flags);
+ }
}
local_irq_restore(flags);
}
@@ -7656,11 +7663,18 @@ int alloc_contig_range(unsigned long start, unsigned long end,
/*
* In case of -EBUSY, we'd like to know which page causes problem.
- * So, just fall through. We will check it in test_pages_isolated().
+ * So, just fall through. test_pages_isolated() has a tracepoint
+ * which will report the busy page.
+ *
+ * It is possible that busy pages could become available before
+ * the call to test_pages_isolated, and the range will actually be
+ * allocated. So, if we fall through be sure to clear ret so that
+ * -EBUSY is not accidentally used or returned to caller.
*/
ret = __alloc_contig_migrate_range(&cc, start, end);
if (ret && ret != -EBUSY)
goto done;
+ ret =0;
/*
* Pages from [start, end) are within a MAX_ORDER_NR_PAGES