Hello,
On 2/5/2013 1:40 AM, Minchan Kim wrote:
...
> Previous time, it's not fully tested and now we checked it with
> highmem support patches.
I get it. Sigh. then [1] inline attached below wan't good.
We have to code like this?
[1] 6a6dccba, mm: cma: don't replace lowmem pages with highmem
diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index b97cf12..0707e0a 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -5671,11 +5671,10 @@ static struct page *
__alloc_contig_migrate_alloc(struct page *page, unsigned long private,
int **resultp)
{
- gfp_t gfp_mask = GFP_USER | __GFP_MOVABLE;
-
- if (PageHighMem(page))
- gfp_mask |= __GFP_HIGHMEM;
-
+ gfp_t gfp_mask = GFP_HIGHUSER_MOVABLE;
+ struct address_space *mapping = page_mapping(page);
+ if (mapping)
+ gfp_mask = mapping_gfp_mask(mapping);
return alloc_page(gfp_mask);
}
Am I right that this code will allocate more pages from himem? Old approach
never migrate lowmem page to himem, what is now possible as gfp mask is
always
taken from mapping_gfp flags. I only wonder if forcing GFP_HIGHUSER_MOVABLE
for pages without the mapping is a correct. Shouldn't we use avoid himem in
such case?
Best regards
--
Marek Szyprowski
Samsung Poland R&D Center
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