linux-kernel - Re: [PATCH] Fix boot problem in situations where the boot CPU is running on a memoryless node

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Message-ID: <Pine.LNX.4.64.0801231626320.21475@sbz-30.cs.Helsinki.FI>
Date:	Wed, 23 Jan 2008 16:32:30 +0200 (EET)
From:	Pekka J Enberg <penberg@...helsinki.fi>
To:	Mel Gorman <mel@....ul.ie>
cc:	akpm@...ux-foundation.org, Christoph Lameter <clameter@....com>,
	linux-kernel@...r.kernel.org, linuxppc-dev@...abs.org,
	"Aneesh Kumar K.V" <aneesh.kumar@...ux.vnet.ibm.com>,
	hanth Aravamudan <nacc@...ibm.com>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	lee.schermerhorn@...com, Linux MM <linux-mm@...ck.org>,
	Olaf Hering <olaf@...fle.de>
Subject: Re: [PATCH] Fix boot problem in situations where the boot CPU is
 running on a memoryless node

On Wed, 23 Jan 2008, Pekka J Enberg wrote:
> I still think Christoph's kmem_getpages() patch is correct (to fix 
> cache_grow() oops) but I overlooked the fact that none the callers of 
> ____cache_alloc_node() deal with bootstrapping (with the exception of 
> __cache_alloc_node() that even has a comment about it).

So something like this (totally untested) patch on top of current git:

---
 mm/slab.c |   18 +++++++++---------
 1 file changed, 9 insertions(+), 9 deletions(-)

Index: linux-2.6/mm/slab.c
===================================================================
--- linux-2.6.orig/mm/slab.c
+++ linux-2.6/mm/slab.c
@@ -1668,7 +1668,11 @@ static void *kmem_getpages(struct kmem_c
 	if (cachep->flags & SLAB_RECLAIM_ACCOUNT)
 		flags |= __GFP_RECLAIMABLE;
 
-	page = alloc_pages_node(nodeid, flags, cachep->gfporder);
+	if (nodeid == -1)
+		page = alloc_pages(flags, cachep->gfporder);
+	else
+		page = alloc_pages_node(nodeid, flags, cachep->gfporder);
+
 	if (!page)
 		return NULL;
 
@@ -2976,8 +2980,9 @@ retry:
 		batchcount = BATCHREFILL_LIMIT;
 	}
 	l3 = cachep->nodelists[node];
+	if (!l3)
+		return NULL;
 
-	BUG_ON(ac->avail > 0 || !l3);
 	spin_lock(&l3->list_lock);
 
 	/* See if we can refill from the shared array */
@@ -3317,7 +3322,8 @@ static void *____cache_alloc_node(struct
 	int x;
 
 	l3 = cachep->nodelists[nodeid];
-	BUG_ON(!l3);
+	if (!l3)
+		return fallback_alloc(cachep, flags);
 
 retry:
 	check_irq_off();
@@ -3394,12 +3400,6 @@ __cache_alloc_node(struct kmem_cache *ca
 	if (unlikely(nodeid == -1))
 		nodeid = numa_node_id();
 
-	if (unlikely(!cachep->nodelists[nodeid])) {
-		/* Node not bootstrapped yet */
-		ptr = fallback_alloc(cachep, flags);
-		goto out;
-	}
-
 	if (nodeid == numa_node_id()) {
 		/*
 		 * Use the locally cached objects if possible.
--
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