linux-kernel - [PATCH] adjust gfp mask passed on nested vmalloc() invocation (v2)

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Date:	Wed, 07 Oct 2009 13:45:22 +0100
From:	"Jan Beulich" <JBeulich@...ell.com>
To:	"Andrew Morton" <akpm@...ux-foundation.org>
Cc:	<linux-mm@...ck.org>, <hugh.dickins@...cali.co.uk>,
	<linux-kernel@...r.kernel.org>
Subject: [PATCH] adjust gfp mask passed on nested vmalloc() invocation
	 (v2)

- avoid wasting more precious resources (DMA or DMA32 pools), when
  being called through vmalloc_32{,_user}()
- explicitly allow using high memory here even if the outer allocation
  request doesn't allow it, unless is collides with __GFP_ZERO

Signed-off-by: Jan Beulich <jbeulich@...ell.com>
Cc: Hugh Dickins <hugh.dickins@...cali.co.uk>

---
 mm/vmalloc.c |    7 +++----
 1 file changed, 3 insertions(+), 4 deletions(-)

--- linux-2.6.32-rc3/mm/vmalloc.c	2009-10-05 11:59:56.000000000 +0200
+++ 2.6.32-rc3-vmalloc-nested-gfp/mm/vmalloc.c	2009-10-07 14:39:38.000000000 +0200
@@ -1410,6 +1410,7 @@ static void *__vmalloc_area_node(struct 
 {
 	struct page **pages;
 	unsigned int nr_pages, array_size, i;
+	gfp_t nested_gfp = (gfp_mask & GFP_RECLAIM_MASK) | __GFP_ZERO;
 
 	nr_pages = (area->size - PAGE_SIZE) >> PAGE_SHIFT;
 	array_size = (nr_pages * sizeof(struct page *));
@@ -1417,13 +1418,11 @@ static void *__vmalloc_area_node(struct 
 	area->nr_pages = nr_pages;
 	/* Please note that the recursion is strictly bounded. */
 	if (array_size > PAGE_SIZE) {
-		pages = __vmalloc_node(array_size, gfp_mask | __GFP_ZERO,
+		pages = __vmalloc_node(array_size, nested_gfp | __GFP_HIGHMEM,
 				PAGE_KERNEL, node, caller);
 		area->flags |= VM_VPAGES;
 	} else {
-		pages = kmalloc_node(array_size,
-				(gfp_mask & GFP_RECLAIM_MASK) | __GFP_ZERO,
-				node);
+		pages = kmalloc_node(array_size, nested_gfp, node);
 	}
 	area->pages = pages;
 	area->caller = caller;



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