Re: 2.6.9 page allocation failure. order:0, mode:0x20

[Andrew Morton]

Michael Clark <michael@xxxxxxxxxxxxxxxx> wrote:
>
> On 10/28/04 17:40, Andrew Morton wrote:
>  > Michael Clark <michael@xxxxxxxxxxxxxxxx> wrote:
>  >> cc1: page allocation failure. order:0, mode:0x20
>  >>   [<c013ba43>] __alloc_pages+0x1c3/0x390
>  >>   [<c013bc35>] __get_free_pages+0x25/0x40
>  >>   [<c013f283>] kmem_getpages+0x23/0xd0
>  >>   [<c013ffcf>] cache_grow+0xaf/0x160
>  >>   [<c0140202>] cache_alloc_refill+0x182/0x230
>  >>   [<c0140499>] kmem_cache_alloc+0x49/0x50
>  >>   [<c01c07df>] radix_tree_node_alloc+0x1f/0x70
>  >>   [<c01c0aad>] radix_tree_insert+0xed/0x110
>  >>   [<c014d841>] __add_to_swap_cache+0x71/0x100
>  >>   [<c014da5f>] add_to_swap+0x5f/0xc0
>  >>   [<c0142d32>] shrink_list+0x442/0x480
>  >>   [<c014bf7c>] page_referenced_anon+0x7c/0x90
>  >>   [<c01419c8>] __pagevec_release+0x28/0x40
>  > 
>  > 
>  > I'm confused.  2.6.9 uses __GFP_NOWARN in add_to_swap() so the messages
>  > should be suppressed.  Are you sure you're using 2.6.9?
> 
>  Ya is 2.6.9, has uml-skas patch also but that doesn't touch swap_state.c
> 
>  Ah, I see I think, radix_tree_node_alloc first calls kmem_cache_alloc
>  with root->gfp_mask and only if this fails dips into the preloaded
>  percpu node stash.

Oh crap, so it does.

--- 25/mm/swap_state.c~swapper_space-warning-suppression	2004-10-28 12:51:06.975218208 -0700
+++ 25-akpm/mm/swap_state.c	2004-10-28 12:51:15.910859784 -0700
@@ -34,7 +34,7 @@ static struct backing_dev_info swap_back
 };
 
 struct address_space swapper_space = {
-	.page_tree	= RADIX_TREE_INIT(GFP_ATOMIC),
+	.page_tree	= RADIX_TREE_INIT(GFP_ATOMIC|__GFP_NOWARN),
 	.tree_lock	= SPIN_LOCK_UNLOCKED,
 	.a_ops		= &swap_aops,
 	.i_mmap_nonlinear = LIST_HEAD_INIT(swapper_space.i_mmap_nonlinear),
_

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