linux-kernel - Re: [S+Q3 00/23] SLUB: The Unified slab allocator (V3)

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Date:	Thu, 5 Aug 2010 12:33:22 -0500 (CDT)
From:	Christoph Lameter <cl@...ux-foundation.org>
To:	David Rientjes <rientjes@...gle.com>
cc:	Pekka Enberg <penberg@...helsinki.fi>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org, Nick Piggin <npiggin@...e.de>
Subject: Re: [S+Q3 00/23] SLUB: The Unified slab allocator (V3)

On Thu, 5 Aug 2010, David Rientjes wrote:

> I bisected this to patch 8 but still don't have a bootlog.  I'm assuming
> in the meantime that something is kmallocing DMA memory on this machine
> prior to kmem_cache_init_late() and get_slab() is returning a NULL
> pointer.

There is a kernel option "earlyprintk=..." that allows you to see early
boot messages.

If this indeed is a problem with the DMA caches then try the following
patch:



Subject: slub: Move dma cache initialization up

Do dma kmalloc initialization in kmem_cache_init and not in kmem_cache_init_late()

Signed-off-by: Christoph Lameter <cl@...ux.com>

---
 mm/slub.c |    9 ++++-----
 1 file changed, 4 insertions(+), 5 deletions(-)

Index: linux-2.6/mm/slub.c
===================================================================
--- linux-2.6.orig/mm/slub.c	2010-08-05 12:24:21.000000000 -0500
+++ linux-2.6/mm/slub.c	2010-08-05 12:28:58.000000000 -0500
@@ -3866,13 +3866,8 @@ void __init kmem_cache_init(void)
 #ifdef CONFIG_SMP
 	register_cpu_notifier(&slab_notifier);
 #endif
-}

-void __init kmem_cache_init_late(void)
-{
 #ifdef CONFIG_ZONE_DMA
-	int i;
-
 	/* Create the dma kmalloc array and make it operational */
 	for (i = 0; i < SLUB_PAGE_SHIFT; i++) {
 		struct kmem_cache *s = kmalloc_caches[i];
@@ -3891,6 +3886,10 @@ void __init kmem_cache_init_late(void)
 #endif
 }

+void __init kmem_cache_init_late(void)
+{
+}
+
 /*
  * Find a mergeable slab cache
  */
--
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