Messages in this thread Patch in this message | | | Date | Thu, 2 Aug 2007 17:47:26 -0700 (PDT) | From | Christoph Lameter <> | Subject | Re: [PATCH] Fix two potential mem leaks in MPT Fusion (mpt_attach()) |
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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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