From: Christoph Lameter <cl@linux.com>
To: Pekka Enberg <penberg@cs.helsinki.fi>
Cc: David Rientjes <rientjes@google.com>,
Andi Kleen <andi@firstfloor.org>,
tj@kernel.org, Metathronius Galabant <m.galabant@googlemail.com>,
Matt Mackall <mpm@selenic.com>,
Eric Dumazet <eric.dumazet@gmail.com>,
Adrian Drzewiecki <z@drze.net>,
linux-mm@kvack.org
Subject: [slub rfc1 10/12] slub: Enable use of get_partial with interrupts enabled
Date: Fri, 02 Sep 2011 15:47:07 -0500 [thread overview]
Message-ID: <20110902204744.967258513@linux.com> (raw)
In-Reply-To: 20110902204657.105194589@linux.com
[-- Attachment #1: irq_enabled_acquire_slab --]
[-- Type: text/plain, Size: 1318 bytes --]
Need to disable interrupts when taking the node list lock.
Signed-off-by: Christoph Lameter <cl@linux.com>
---
mm/slub.c | 5 +++--
1 file changed, 3 insertions(+), 2 deletions(-)
Index: linux-2.6/mm/slub.c
===================================================================
--- linux-2.6.orig/mm/slub.c 2011-09-02 10:12:03.601176577 -0500
+++ linux-2.6/mm/slub.c 2011-09-02 10:12:25.981176437 -0500
@@ -1609,6 +1609,7 @@ static struct page *get_partial_node(str
struct kmem_cache_node *n)
{
struct page *page;
+ unsigned long flags;
/*
* Racy check. If we mistakenly see no partial slabs then we
@@ -1619,13 +1620,13 @@ static struct page *get_partial_node(str
if (!n || !n->nr_partial)
return NULL;
- spin_lock(&n->list_lock);
+ spin_lock_irqsave(&n->list_lock, flags);
list_for_each_entry(page, &n->partial, lru)
if (acquire_slab(s, n, page))
goto out;
page = NULL;
out:
- spin_unlock(&n->list_lock);
+ spin_unlock_irqrestore(&n->list_lock, flags);
return page;
}
--
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next prev parent reply other threads:[~2011-09-02 20:47 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-09-02 20:46 [slub rfc1 00/12] slub: RFC lockless allocation paths V1 Christoph Lameter
2011-09-02 20:46 ` [slub rfc1 01/12] slub: free slabs without holding locks (V2) Christoph Lameter
2011-09-02 20:46 ` [slub rfc1 02/12] slub: Remove useless statements in __slab_alloc Christoph Lameter
2011-09-02 20:47 ` [slub rfc1 03/12] slub: Get rid of the node field Christoph Lameter
2011-09-02 20:47 ` [slub rfc1 04/12] slub: Separate out kmem_cache_cpu processing from deactivate_slab Christoph Lameter
2011-09-02 20:47 ` [slub rfc1 05/12] slub: Extract get_freelist from __slab_alloc Christoph Lameter
2011-09-02 20:47 ` [slub rfc1 06/12] slub: Use freelist instead of "object" in __slab_alloc Christoph Lameter
2011-09-02 20:47 ` [slub rfc1 07/12] slub: pass page to node_match() instead of kmem_cache_cpu structure Christoph Lameter
2011-09-02 20:47 ` [slub rfc1 08/12] slub: enable use of deactivate_slab with interrupts on Christoph Lameter
2011-09-02 20:47 ` [slub rfc1 09/12] slub: Run deactivate_slab with interrupts enabled Christoph Lameter
2011-09-02 20:47 ` Christoph Lameter [this message]
2011-09-02 20:47 ` [slub rfc1 11/12] slub: Remove kmem_cache_cpu dependency from acquire slab Christoph Lameter
2011-09-02 20:47 ` [slub rfc1 12/12] slub: Drop page field from kmem_cache_cpu Christoph Lameter
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