The patch titled
Subject: slub: avoid irqoff/on in bulk allocation
has been added to the -mm tree. Its filename is
slub-avoid-irqoff-on-in-bulk-allocation.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/slub-avoid-irqoff-on-in-bulk-allocation.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/slub-avoid-irqoff-on-in-bulk-allocation.patch
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------------------------------------------------------
From: Christoph Lameter <cl@xxxxxxxxx>
Subject: slub: avoid irqoff/on in bulk allocation
Use the new function that can do allocation while interrupts are disabled.
Avoids irq on/off sequences.
Signed-off-by: Christoph Lameter <cl@xxxxxxxxx>
Cc: Jesper Dangaard Brouer <brouer@xxxxxxxxxx>
Cc: Pekka Enberg <penberg@xxxxxxxxxx>
Cc: David Rientjes <rientjes@xxxxxxxxxx>
Cc: Joonsoo Kim <iamjoonsoo.kim@xxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/slub.c | 24 +++++++++++-------------
1 file changed, 11 insertions(+), 13 deletions(-)
diff -puN mm/slub.c~slub-avoid-irqoff-on-in-bulk-allocation mm/slub.c
--- a/mm/slub.c~slub-avoid-irqoff-on-in-bulk-allocation
+++ a/mm/slub.c
@@ -2807,30 +2807,23 @@ bool kmem_cache_alloc_bulk(struct kmem_c
void *object = c->freelist;
if (unlikely(!object)) {
- local_irq_enable();
/*
* Invoking slow path likely have side-effect
* of re-populating per CPU c->freelist
*/
- p[i] = __slab_alloc(s, flags, NUMA_NO_NODE,
+ p[i] = ___slab_alloc(s, flags, NUMA_NO_NODE,
_RET_IP_, c);
- if (unlikely(!p[i])) {
- __kmem_cache_free_bulk(s, i, p);
- return false;
- }
- local_irq_disable();
+ if (unlikely(!p[i]))
+ goto error;
+
c = this_cpu_ptr(s->cpu_slab);
continue; /* goto for-loop */
}
/* kmem_cache debug support */
s = slab_pre_alloc_hook(s, flags);
- if (unlikely(!s)) {
- __kmem_cache_free_bulk(s, i, p);
- c->tid = next_tid(c->tid);
- local_irq_enable();
- return false;
- }
+ if (unlikely(!s))
+ goto error;
c->freelist = get_freepointer(s, object);
p[i] = object;
@@ -2850,6 +2843,11 @@ bool kmem_cache_alloc_bulk(struct kmem_c
}
return true;
+
+error:
+ __kmem_cache_free_bulk(s, i, p);
+ local_irq_enable();
+ return false;
}
EXPORT_SYMBOL(kmem_cache_alloc_bulk);
_
Patches currently in -mm which might be from cl@xxxxxxxxx are
slub-avoid-irqoff-on-in-bulk-allocation.patch
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