Annotations will be used for fair zone allocation policy. Patch is mostly
taken from a link posted by Johannes on IRC. It's not perfect because all
callers of these paths are not guaranteed to be allocating pages for page
cache. However, it's probably close enough to cover all cases that matter
with minimal distortion.
Not-signed-off
---
include/linux/gfp.h | 4 +++-
include/linux/pagemap.h | 2 +-
mm/filemap.c | 2 ++
3 files changed, 6 insertions(+), 2 deletions(-)
diff --git a/include/linux/gfp.h b/include/linux/gfp.h
index 9b4dd49..f69e4cb 100644
--- a/include/linux/gfp.h
+++ b/include/linux/gfp.h
@@ -35,6 +35,7 @@ struct vm_area_struct;
#define ___GFP_NO_KSWAPD 0x400000u
#define ___GFP_OTHER_NODE 0x800000u
#define ___GFP_WRITE 0x1000000u
+#define ___GFP_PAGECACHE 0x2000000u
/* If the above are modified, __GFP_BITS_SHIFT may need updating */
/*
@@ -92,6 +93,7 @@ struct vm_area_struct;
#define __GFP_OTHER_NODE ((__force gfp_t)___GFP_OTHER_NODE) /* On behalf of
other node */
#define __GFP_KMEMCG ((__force gfp_t)___GFP_KMEMCG) /* Allocation comes from
a memcg-accounted resource */
#define __GFP_WRITE ((__force gfp_t)___GFP_WRITE) /* Allocator intends to
dirty page */
+#define __GFP_PAGECACHE ((__force gfp_t)___GFP_PAGECACHE) /* Page cache
allocation */
/*
* This may seem redundant, but it's a way of annotating false positives vs.
@@ -99,7 +101,7 @@ struct vm_area_struct;
*/
#define __GFP_NOTRACK_FALSE_POSITIVE (__GFP_NOTRACK)
-#define __GFP_BITS_SHIFT 25 /* Room for N __GFP_FOO bits */
+#define __GFP_BITS_SHIFT 26 /* Room for N __GFP_FOO bits */
#define __GFP_BITS_MASK ((__force gfp_t)((1 << __GFP_BITS_SHIFT) - 1))
/* This equals 0, but use constants in case they ever change */
diff --git a/include/linux/pagemap.h b/include/linux/pagemap.h
index e3dea75..bda4845 100644
--- a/include/linux/pagemap.h
+++ b/include/linux/pagemap.h
@@ -221,7 +221,7 @@ extern struct page *__page_cache_alloc(gfp_t gfp);
#else
static inline struct page *__page_cache_alloc(gfp_t gfp)
{
- return alloc_pages(gfp, 0);
+ return alloc_pages(gfp | __GFP_PAGECACHE, 0);
}
#endif
diff --git a/mm/filemap.c b/mm/filemap.c
index b7749a9..5bb9225 100644
--- a/mm/filemap.c
+++ b/mm/filemap.c
@@ -517,6 +517,8 @@ struct page *__page_cache_alloc(gfp_t gfp)
int n;
struct page *page;
+ gfp |= __GFP_PAGECACHE;
+
if (cpuset_do_page_mem_spread()) {
unsigned int cpuset_mems_cookie;
do {
--
1.8.4
--
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