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authorLinus Torvalds <torvalds@linux-foundation.org>2010-01-27 17:20:03 (GMT)
committerLinus Torvalds <torvalds@linux-foundation.org>2010-01-27 17:20:03 (GMT)
commit0531b2aac59c2296570ac52bfc032ef2ace7d5e1 (patch)
tree4ca454bdc03c24654529bab9c882c1cd5f99a88c /include
parentcaf0801e0cc482497c14a9ce349469c33c60beec (diff)
mm: add new 'read_cache_page_gfp()' helper function
It's a simplified 'read_cache_page()' which takes a page allocation flag, so that different paths can control how aggressive the memory allocations are that populate a address space. In particular, the intel GPU object mapping code wants to be able to do a certain amount of own internal memory management by automatically shrinking the address space when memory starts getting tight. This allows it to dynamically use different memory allocation policies on a per-allocation basis, rather than depend on the (static) address space gfp policy. The actual new function is a one-liner, but re-organizing the helper functions to the point where you can do this with a single line of code is what most of the patch is all about. Tested-by: Chris Wilson <chris@chris-wilson.co.uk> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'include')
-rw-r--r--include/linux/pagemap.h2
1 files changed, 2 insertions, 0 deletions
diff --git a/include/linux/pagemap.h b/include/linux/pagemap.h
index ed5d750..3c62ed4 100644
--- a/include/linux/pagemap.h
+++ b/include/linux/pagemap.h
@@ -253,6 +253,8 @@ extern struct page * read_cache_page_async(struct address_space *mapping,
extern struct page * read_cache_page(struct address_space *mapping,
pgoff_t index, filler_t *filler,
void *data);
+extern struct page * read_cache_page_gfp(struct address_space *mapping,
+ pgoff_t index, gfp_t gfp_mask);
extern int read_cache_pages(struct address_space *mapping,
struct list_head *pages, filler_t *filler, void *data);

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