[PATCH] mempool: NOMEMALLOC and NORETRY

Mempools have 2 problems.

The first is that mempool_alloc can possibly get stuck in __alloc_pages
when they should opt to fail, and take an element from their reserved pool.

The second is that it will happily eat emergency PF_MEMALLOC reserves
instead of going to their reserved pools.

Fix the first by passing __GFP_NORETRY in the allocation calls in
mempool_alloc.  Fix the second by introducing a __GFP_MEMPOOL flag which
directs the page allocator not to allocate from the reserve pool.

Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

1 files changed, 12 insertions, 8 deletions

diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index 08e8627..04a35b3 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -799,14 +799,18 @@ __alloc_pages(unsigned int __nocast gfp_mask, unsigned int order,
 	}
 
 	/* This allocation should allow future memory freeing. */
-	if (((p->flags & PF_MEMALLOC) || unlikely(test_thread_flag(TIF_MEMDIE))) && !in_interrupt()) {
-		/* go through the zonelist yet again, ignoring mins */
-		for (i = 0; (z = zones[i]) != NULL; i++) {
-			if (!cpuset_zone_allowed(z))
-				continue;
-			page = buffered_rmqueue(z, order, gfp_mask);
-			if (page)
-				goto got_pg;
+
+	if (((p->flags & PF_MEMALLOC) || unlikely(test_thread_flag(TIF_MEMDIE)))
+			&& !in_interrupt()) {
+		if (!(gfp_mask & __GFP_NOMEMALLOC)) {
+			/* go through the zonelist yet again, ignoring mins */
+			for (i = 0; (z = zones[i]) != NULL; i++) {
+				if (!cpuset_zone_allowed(z))
+					continue;
+				page = buffered_rmqueue(z, order, gfp_mask);
+				if (page)
+					goto got_pg;
+			}
 		}
 		goto nopage;
 	}