50 lines
2.0 KiB
Diff
50 lines
2.0 KiB
Diff
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From: Peter Zijlstra <a.p.zijlstra@chello.nl>
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Subject: [PATCH 10/31] mm: __GFP_MEMALLOC
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Patch-mainline: not yet
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__GFP_MEMALLOC will allow the allocation to disregard the watermarks,
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much like PF_MEMALLOC.
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It allows one to pass along the memalloc state in object related allocation
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flags as opposed to task related flags, such as sk->sk_allocation.
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Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
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Signed-off-by: Suresh Jayaraman <sjayaraman@suse.de>
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---
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include/linux/gfp.h | 3 ++-
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mm/page_alloc.c | 4 +++-
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2 files changed, 5 insertions(+), 2 deletions(-)
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--- a/include/linux/gfp.h
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+++ b/include/linux/gfp.h
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@@ -47,6 +47,7 @@ struct vm_area_struct;
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#define __GFP_REPEAT ((__force gfp_t)0x400u) /* See above */
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#define __GFP_NOFAIL ((__force gfp_t)0x800u) /* See above */
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#define __GFP_NORETRY ((__force gfp_t)0x1000u)/* See above */
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+#define __GFP_MEMALLOC ((__force gfp_t)0x2000u)/* Use emergency reserves */
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#define __GFP_COMP ((__force gfp_t)0x4000u)/* Add compound page metadata */
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#define __GFP_ZERO ((__force gfp_t)0x8000u)/* Return zeroed page on success */
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#define __GFP_NOMEMALLOC ((__force gfp_t)0x10000u) /* Don't use emergency reserves */
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@@ -98,7 +99,7 @@ struct vm_area_struct;
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/* Control page allocator reclaim behavior */
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#define GFP_RECLAIM_MASK (__GFP_WAIT|__GFP_HIGH|__GFP_IO|__GFP_FS|\
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__GFP_NOWARN|__GFP_REPEAT|__GFP_NOFAIL|\
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- __GFP_NORETRY|__GFP_NOMEMALLOC)
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+ __GFP_NORETRY|__GFP_MEMALLOC|__GFP_NOMEMALLOC)
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/* Control slab gfp mask during early boot */
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#define GFP_BOOT_MASK __GFP_BITS_MASK & ~(__GFP_WAIT|__GFP_IO|__GFP_FS)
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--- a/mm/page_alloc.c
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+++ b/mm/page_alloc.c
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@@ -1787,7 +1787,9 @@ int gfp_to_alloc_flags(gfp_t gfp_mask)
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alloc_flags |= ALLOC_HARDER;
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if (likely(!(gfp_mask & __GFP_NOMEMALLOC))) {
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- if (!in_irq() && (p->flags & PF_MEMALLOC))
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+ if (gfp_mask & __GFP_MEMALLOC)
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+ alloc_flags |= ALLOC_NO_WATERMARKS;
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+ else if (!in_irq() && (p->flags & PF_MEMALLOC))
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alloc_flags |= ALLOC_NO_WATERMARKS;
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else if (!in_interrupt() &&
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unlikely(test_thread_flag(TIF_MEMDIE)))
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