linux-kernel - Re: [PATCH] Fix two potential mem leaks in MPT Fusion (mpt

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Message-ID: <Pine.LNX.4.64.0708021738050.13312@schroedinger.engr.sgi.com>
Date:	Thu, 2 Aug 2007 17:47:26 -0700 (PDT)
From:	Christoph Lameter <clameter@....com>
To:	Jesper Juhl <jesper.juhl@...il.com>
cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	James Bottomley <James.Bottomley@...eleye.com>,
	Pekka Enberg <penberg@...helsinki.fi>, linux-mm@...ck.org,
	Ingo Molnar <mingo@...e.hu>, Matt Mackall <mpm@...enic.com>
Subject: Re: [PATCH] Fix two potential mem leaks in MPT Fusion (mpt_attach())

Mempools do not want to wait if there is an allocation failure. Its like 
GFP_THISNODE in that we want a failure.

I had to add a

if (NUMA_BUILD && (gfp_mask & GFP_THISNODE) == GFP_THISNODE)
                goto nopage;

in page_alloc.c to make GFP_THISNODE fail.

Maybe add a GFP_FAIL and check for that?


diff --git a/include/linux/gfp.h b/include/linux/gfp.h
index bc68dd9..41b6aa3 100644
--- a/include/linux/gfp.h
+++ b/include/linux/gfp.h
@@ -43,6 +43,7 @@ struct vm_area_struct;
 #define __GFP_REPEAT	((__force gfp_t)0x400u)	/* Retry the allocation.  Might fail */
 #define __GFP_NOFAIL	((__force gfp_t)0x800u)	/* Retry for ever.  Cannot fail */
 #define __GFP_NORETRY	((__force gfp_t)0x1000u)/* Do not retry.  Might fail */
+#define __GFP_FAIL	((__force gfp_t)0x2000u)/* Fail immediately if there is a problem */
 #define __GFP_COMP	((__force gfp_t)0x4000u)/* Add compound page metadata */
 #define __GFP_ZERO	((__force gfp_t)0x8000u)/* Return zeroed page on success */
 #define __GFP_NOMEMALLOC ((__force gfp_t)0x10000u) /* Don't use emergency reserves */
@@ -81,7 +82,8 @@ struct vm_area_struct;
 				 __GFP_MOVABLE)
 
 #ifdef CONFIG_NUMA
-#define GFP_THISNODE	(__GFP_THISNODE | __GFP_NOWARN | __GFP_NORETRY)
+#define GFP_THISNODE	(__GFP_THISNODE | __GFP_NOWARN | __GFP_NORETRY |\
+				__GFP_FAIL)
 #else
 #define GFP_THISNODE	((__force gfp_t)0)
 #endif
diff --git a/mm/mempool.c b/mm/mempool.c
index 02d5ec3..c1ac622 100644
--- a/mm/mempool.c
+++ b/mm/mempool.c
@@ -211,8 +211,9 @@ void * mempool_alloc(mempool_t *pool, gfp_t gfp_mask)
 	gfp_mask |= __GFP_NOMEMALLOC;	/* don't allocate emergency reserves */
 	gfp_mask |= __GFP_NORETRY;	/* don't loop in __alloc_pages */
 	gfp_mask |= __GFP_NOWARN;	/* failures are OK */
+	gfp_mask |= __GFP_FAIL;
 
-	gfp_temp = gfp_mask & ~(__GFP_WAIT|__GFP_IO);
+	gfp_temp = gfp_mask & ~__GFP_IO;
 
 repeat_alloc:
 
diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index 3da85b8..58c1a4d 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -1250,15 +1250,7 @@ restart:
 	if (page)
 		goto got_pg;
 
-	/*
-	 * GFP_THISNODE (meaning __GFP_THISNODE, __GFP_NORETRY and
-	 * __GFP_NOWARN set) should not cause reclaim since the subsystem
-	 * (f.e. slab) using GFP_THISNODE may choose to trigger reclaim
-	 * using a larger set of nodes after it has established that the
-	 * allowed per node queues are empty and that nodes are
-	 * over allocated.
-	 */
-	if (NUMA_BUILD && (gfp_mask & GFP_THISNODE) == GFP_THISNODE)
+	if (gfp_mask & __GFP_FAIL)
 		goto nopage;
 
 	for (z = zonelist->zones; *z; z++)



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