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authorNick Piggin <nickpiggin@yahoo.com.au>2005-05-01 08:58:36 -0700
committerLinus Torvalds <torvalds@ppc970.osdl.org>2005-05-01 08:58:36 -0700
commitb84a35be0285229b0a8a5e2e04d79360c5b75562 (patch)
tree3ff63fde8534eb615b408d047b461015781f6a5b /include/linux/gfp.h
parent8e30f272a93ec9c1d5c305c5040dfaebc880499d (diff)
downloadop-kernel-dev-b84a35be0285229b0a8a5e2e04d79360c5b75562.zip
op-kernel-dev-b84a35be0285229b0a8a5e2e04d79360c5b75562.tar.gz
[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>
Diffstat (limited to 'include/linux/gfp.h')
-rw-r--r--include/linux/gfp.h6
1 files changed, 4 insertions, 2 deletions
diff --git a/include/linux/gfp.h b/include/linux/gfp.h
index 848a1ba..af7407e 100644
--- a/include/linux/gfp.h
+++ b/include/linux/gfp.h
@@ -38,14 +38,16 @@ struct vm_area_struct;
#define __GFP_NO_GROW 0x2000u /* Slab internal usage */
#define __GFP_COMP 0x4000u /* Add compound page metadata */
#define __GFP_ZERO 0x8000u /* Return zeroed page on success */
+#define __GFP_NOMEMALLOC 0x10000u /* Don't use emergency reserves */
-#define __GFP_BITS_SHIFT 16 /* Room for 16 __GFP_FOO bits */
+#define __GFP_BITS_SHIFT 20 /* Room for 20 __GFP_FOO bits */
#define __GFP_BITS_MASK ((1 << __GFP_BITS_SHIFT) - 1)
/* if you forget to add the bitmask here kernel will crash, period */
#define GFP_LEVEL_MASK (__GFP_WAIT|__GFP_HIGH|__GFP_IO|__GFP_FS| \
__GFP_COLD|__GFP_NOWARN|__GFP_REPEAT| \
- __GFP_NOFAIL|__GFP_NORETRY|__GFP_NO_GROW|__GFP_COMP)
+ __GFP_NOFAIL|__GFP_NORETRY|__GFP_NO_GROW|__GFP_COMP| \
+ __GFP_NOMEMALLOC)
#define GFP_ATOMIC (__GFP_HIGH)
#define GFP_NOIO (__GFP_WAIT)
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