From: Tejun Heo <tj@kernel.org>
To: Christoph Lameter <cl@linux.com>
Cc: Pekka Enberg <penberg@cs.helsinki.fi>,
Stephen Rothwell <sfr@canb.auug.org.au>,
linux-next@vger.kernel.org, lkml <linux-kernel@vger.kernel.org>
Subject: [PATCH 2/3] percpu: reduce PCPU_MIN_UNIT_SIZE to 32k
Date: Fri, 03 Sep 2010 18:26:09 +0200 [thread overview]
Message-ID: <4C8121A1.8060809@kernel.org> (raw)
In-Reply-To: <4C762734.1030402@kernel.org>
In preparation of enabling percpu allocator for UP, reduce
PCPU_MIN_UNIT_SIZE to 32k. On UP, the first chunk doesn't have to
include static percpu variables and chunk size can be smaller which is
important as UP percpu allocator will use contiguous kernel memory to
populate chunks.
PCPU_MIN_UNIT_SIZE also determines the maximum supported allocation
size but 32k should still be enough.
Signed-off-by: Tejun Heo <tj@kernel.org>
---
include/linux/percpu.h | 2 +-
1 files changed, 1 insertions(+), 1 deletions(-)
diff --git a/include/linux/percpu.h b/include/linux/percpu.h
index 49466b1..fc8130a 100644
--- a/include/linux/percpu.h
+++ b/include/linux/percpu.h
@@ -42,7 +42,7 @@
#ifdef CONFIG_SMP
/* minimum unit size, also is the maximum supported allocation size */
-#define PCPU_MIN_UNIT_SIZE PFN_ALIGN(64 << 10)
+#define PCPU_MIN_UNIT_SIZE PFN_ALIGN(32 << 10)
/*
* Percpu allocator can serve percpu allocations before slab is
--
1.7.1
next prev parent reply other threads:[~2010-09-03 16:26 UTC|newest]
Thread overview: 31+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-08-24 2:07 linux-next: build failure after merge of the final tree (slab tree related) Stephen Rothwell
2010-08-24 17:41 ` Pekka Enberg
2010-08-24 17:59 ` Christoph Lameter
2010-08-24 18:32 ` Pekka Enberg
2010-08-24 18:53 ` Christoph Lameter
2010-08-25 8:18 ` Tejun Heo
2010-08-25 8:57 ` Pekka Enberg
2010-08-25 13:50 ` Christoph Lameter
2010-08-26 8:35 ` Tejun Heo
2010-09-03 16:25 ` [PATCH 1/3] vmalloc: pcpu_get/free_vm_areas() aren't needed on UP Tejun Heo
2010-09-03 17:16 ` Christoph Lameter
2010-09-03 16:26 ` Tejun Heo [this message]
2010-09-03 17:18 ` [PATCH 2/3] percpu: reduce PCPU_MIN_UNIT_SIZE to 32k Christoph Lameter
2010-09-03 16:26 ` [PATCH 3/3] percpu: use percpu allocator on UP too Tejun Heo
2010-09-03 18:43 ` Christoph Lameter
2010-09-04 6:54 ` Pekka Enberg
2010-09-04 9:47 ` Tejun Heo
2010-09-08 9:17 ` Tejun Heo
2010-09-10 14:59 ` Tejun Heo
2010-09-18 17:47 ` Pekka Enberg
2010-09-03 16:27 ` [PATCH RESEND 1/3] vmalloc: pcpu_get/free_vm_areas() aren't needed on UP Tejun Heo
2010-08-25 20:12 ` linux-next: build failure after merge of the final tree (slab tree related) Christoph Lameter
2010-08-25 21:37 ` Christoph Lameter
2010-08-25 0:13 ` Stephen Rothwell
2010-08-25 4:46 ` Pekka Enberg
2010-08-25 14:07 ` Christoph Lameter
2010-08-26 0:01 ` David Rientjes
2010-08-26 1:35 ` Christoph Lameter
2010-08-26 3:16 ` David Rientjes
2010-08-26 14:41 ` Christoph Lameter
2010-08-26 18:16 ` Pekka Enberg
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