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Date: Thu, 14 Apr 2011 11:41:29 +0100
From: Mel Gorman <mgorman@...e.de>
To: Linux-MM <linux-mm@...ck.org>,
Linux-Netdev <netdev@...r.kernel.org>
Cc: LKML <linux-kernel@...r.kernel.org>,
Peter Zijlstra <a.p.zijlstra@...llo.nl>,
Mel Gorman <mgorman@...e.de>
Subject: [PATCH 03/12] mm: Introduce __GFP_MEMALLOC to allow access to emergency reserves
__GFP_MEMALLOC will allow the allocation to disregard the watermarks,
much like PF_MEMALLOC. It allows one to pass along the memalloc state in
object related allocation flags as opposed to task related flags, such
as sk->sk_allocation. This removes the need for ALLOC_PFMEMALLOC as
callers using __GFP_MEMALLOC can get the ALLOC_NO_WATERMARK flag which
is now enough to identify allocations related to page reclaim.
Signed-off-by: Peter Zijlstra <a.p.zijlstra@...llo.nl>
Signed-off-by: Mel Gorman <mgorman@...e.de>
---
include/linux/gfp.h | 4 +++-
include/linux/mm_types.h | 2 +-
mm/page_alloc.c | 14 ++++++--------
mm/slab.c | 2 +-
4 files changed, 11 insertions(+), 11 deletions(-)
diff --git a/include/linux/gfp.h b/include/linux/gfp.h
index dca3176..d54eb02 100644
--- a/include/linux/gfp.h
+++ b/include/linux/gfp.h
@@ -23,6 +23,7 @@ struct vm_area_struct;
#define ___GFP_REPEAT 0x400u
#define ___GFP_NOFAIL 0x800u
#define ___GFP_NORETRY 0x1000u
+#define ___GFP_MEMALLOC 0x2000u
#define ___GFP_COMP 0x4000u
#define ___GFP_ZERO 0x8000u
#define ___GFP_NOMEMALLOC 0x10000u
@@ -74,6 +75,7 @@ struct vm_area_struct;
#define __GFP_REPEAT ((__force gfp_t)___GFP_REPEAT) /* See above */
#define __GFP_NOFAIL ((__force gfp_t)___GFP_NOFAIL) /* See above */
#define __GFP_NORETRY ((__force gfp_t)___GFP_NORETRY) /* See above */
+#define __GFP_MEMALLOC ((__force gfp_t)___GFP_MEMALLOC)/* Allow access to emergency reserves */
#define __GFP_COMP ((__force gfp_t)___GFP_COMP) /* Add compound page metadata */
#define __GFP_ZERO ((__force gfp_t)___GFP_ZERO) /* Return zeroed page on success */
#define __GFP_NOMEMALLOC ((__force gfp_t)___GFP_NOMEMALLOC) /* Don't use emergency reserves */
@@ -125,7 +127,7 @@ struct vm_area_struct;
/* Control page allocator reclaim behavior */
#define GFP_RECLAIM_MASK (__GFP_WAIT|__GFP_HIGH|__GFP_IO|__GFP_FS|\
__GFP_NOWARN|__GFP_REPEAT|__GFP_NOFAIL|\
- __GFP_NORETRY|__GFP_NOMEMALLOC)
+ __GFP_NORETRY|__GFP_MEMALLOC|__GFP_NOMEMALLOC)
/* Control slab gfp mask during early boot */
#define GFP_BOOT_MASK (__GFP_BITS_MASK & ~(__GFP_WAIT|__GFP_IO|__GFP_FS))
diff --git a/include/linux/mm_types.h b/include/linux/mm_types.h
index 1a5e14b..d166b21 100644
--- a/include/linux/mm_types.h
+++ b/include/linux/mm_types.h
@@ -72,7 +72,7 @@ struct page {
pgoff_t index; /* Our offset within mapping. */
void *freelist; /* SLUB: freelist req. slab lock */
bool pfmemalloc; /* If set by the page allocator,
- * ALLOC_PFMEMALLOC was set and the
+ * ALLOC_NO_WATERMARKS was set and the
* low watermark was not met implying
* that the system is under some
* pressure. The caller should try
diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index fb34549..2f897c3 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -1360,7 +1360,6 @@ failed:
#define ALLOC_HARDER 0x10 /* try to alloc harder */
#define ALLOC_HIGH 0x20 /* __GFP_HIGH set */
#define ALLOC_CPUSET 0x40 /* check for correct cpuset */
-#define ALLOC_PFMEMALLOC 0x80 /* Caller has PF_MEMALLOC set */
#ifdef CONFIG_FAIL_PAGE_ALLOC
@@ -1982,11 +1981,10 @@ gfp_to_alloc_flags(gfp_t gfp_mask)
} else if (unlikely(rt_task(current)) && !in_interrupt())
alloc_flags |= ALLOC_HARDER;
- if ((current->flags & PF_MEMALLOC) ||
- unlikely(test_thread_flag(TIF_MEMDIE))) {
- alloc_flags |= ALLOC_PFMEMALLOC;
-
- if (likely(!(gfp_mask & __GFP_NOMEMALLOC)) && !in_interrupt())
+ if (likely(!(gfp_mask & __GFP_NOMEMALLOC))) {
+ if (gfp_mask & __GFP_MEMALLOC)
+ alloc_flags |= ALLOC_NO_WATERMARKS;
+ else if (likely(!(gfp_mask & __GFP_NOMEMALLOC)) && !in_interrupt())
alloc_flags |= ALLOC_NO_WATERMARKS;
}
@@ -1995,7 +1993,7 @@ gfp_to_alloc_flags(gfp_t gfp_mask)
bool gfp_pfmemalloc_allowed(gfp_t gfp_mask)
{
- return gfp_to_alloc_flags(gfp_mask) & ALLOC_PFMEMALLOC;
+ return gfp_to_alloc_flags(gfp_mask) & ALLOC_NO_WATERMARKS;
}
static inline struct page *
@@ -2183,7 +2181,7 @@ got_pg:
* steps that will free more memory. The caller should avoid the
* page being used for !PFMEMALLOC purposes.
*/
- page->pfmemalloc = (alloc_flags & ALLOC_PFMEMALLOC);
+ page->pfmemalloc = (alloc_flags & ALLOC_NO_WATERMARKS);
return page;
}
diff --git a/mm/slab.c b/mm/slab.c
index 953e6263..8f81d17 100644
--- a/mm/slab.c
+++ b/mm/slab.c
@@ -2977,7 +2977,7 @@ static int cache_grow(struct kmem_cache *cachep,
if (!slabp)
goto opps1;
- /* Record if ALLOC_PFMEMALLOC was set when allocating the slab */
+ /* Record if ALLOC_NO_WATERMARKS was set when allocating the slab */
if (pfmemalloc) {
struct array_cache *ac = cpu_cache_get(cachep);
slabp->pfmemalloc = true;
--
1.7.3.4
--
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