diff options
author | Nick Piggin <nickpiggin@yahoo.com.au> | 2005-05-01 11:58:36 -0400 |
---|---|---|
committer | Linus Torvalds <torvalds@ppc970.osdl.org> | 2005-05-01 11:58:36 -0400 |
commit | b84a35be0285229b0a8a5e2e04d79360c5b75562 (patch) | |
tree | 3ff63fde8534eb615b408d047b461015781f6a5b /include/linux | |
parent | 8e30f272a93ec9c1d5c305c5040dfaebc880499d (diff) |
[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')
-rw-r--r-- | include/linux/gfp.h | 6 |
1 files changed, 4 insertions, 2 deletions
diff --git a/include/linux/gfp.h b/include/linux/gfp.h index 848a1baac079..af7407e8cfc5 100644 --- a/include/linux/gfp.h +++ b/include/linux/gfp.h | |||
@@ -38,14 +38,16 @@ struct vm_area_struct; | |||
38 | #define __GFP_NO_GROW 0x2000u /* Slab internal usage */ | 38 | #define __GFP_NO_GROW 0x2000u /* Slab internal usage */ |
39 | #define __GFP_COMP 0x4000u /* Add compound page metadata */ | 39 | #define __GFP_COMP 0x4000u /* Add compound page metadata */ |
40 | #define __GFP_ZERO 0x8000u /* Return zeroed page on success */ | 40 | #define __GFP_ZERO 0x8000u /* Return zeroed page on success */ |
41 | #define __GFP_NOMEMALLOC 0x10000u /* Don't use emergency reserves */ | ||
41 | 42 | ||
42 | #define __GFP_BITS_SHIFT 16 /* Room for 16 __GFP_FOO bits */ | 43 | #define __GFP_BITS_SHIFT 20 /* Room for 20 __GFP_FOO bits */ |
43 | #define __GFP_BITS_MASK ((1 << __GFP_BITS_SHIFT) - 1) | 44 | #define __GFP_BITS_MASK ((1 << __GFP_BITS_SHIFT) - 1) |
44 | 45 | ||
45 | /* if you forget to add the bitmask here kernel will crash, period */ | 46 | /* if you forget to add the bitmask here kernel will crash, period */ |
46 | #define GFP_LEVEL_MASK (__GFP_WAIT|__GFP_HIGH|__GFP_IO|__GFP_FS| \ | 47 | #define GFP_LEVEL_MASK (__GFP_WAIT|__GFP_HIGH|__GFP_IO|__GFP_FS| \ |
47 | __GFP_COLD|__GFP_NOWARN|__GFP_REPEAT| \ | 48 | __GFP_COLD|__GFP_NOWARN|__GFP_REPEAT| \ |
48 | __GFP_NOFAIL|__GFP_NORETRY|__GFP_NO_GROW|__GFP_COMP) | 49 | __GFP_NOFAIL|__GFP_NORETRY|__GFP_NO_GROW|__GFP_COMP| \ |
50 | __GFP_NOMEMALLOC) | ||
49 | 51 | ||
50 | #define GFP_ATOMIC (__GFP_HIGH) | 52 | #define GFP_ATOMIC (__GFP_HIGH) |
51 | #define GFP_NOIO (__GFP_WAIT) | 53 | #define GFP_NOIO (__GFP_WAIT) |