Ahh. Fallback_alloc() does not do the check for GFP_WAIT as done in
cache_grow(). Thus interrupts are disabled when we call kmem_getpages()
which results in the failure.
Duplicate the handling of GFP_WAIT in cache_grow().
Jay could you try this patch?
Signed-off-by: Christoph Lameter <[email protected]>
Index: linux-2.6/mm/slab.c
===================================================================
--- linux-2.6.orig/mm/slab.c 2006-12-11 09:25:57.000000000 -0800
+++ linux-2.6/mm/slab.c 2006-12-11 09:34:08.000000000 -0800
@@ -3252,6 +3252,7 @@
struct zone **z;
void *obj = NULL;
int nid;
+ gfp_t local_flags = (flags & GFP_LEVEL_MASK);
retry:
/*
@@ -3275,7 +3276,12 @@
* We may trigger various forms of reclaim on the allowed
* set and go into memory reserves if necessary.
*/
+ if (local_flags & __GFP_WAIT)
+ local_irq_enable();
+ kmem_flagcheck(cache, flags);
obj = kmem_getpages(cache, flags, -1);
+ if (local_flags & __GFP_WAIT)
+ local_irq_disable();
if (obj) {
/*
* Insert into the appropriate per node queues
-
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