linux-kernel - Re: [patch 1/2] slub: move min_partial to struct kmem

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Message-ID: <alpine.DEB.2.00.0902230835120.24379@chino.kir.corp.google.com>
Date:	Mon, 23 Feb 2009 08:37:19 -0800 (PST)
From:	David Rientjes <rientjes@...gle.com>
To:	Christoph Lameter <cl@...ux-foundation.org>
cc:	Pekka Enberg <penberg@...helsinki.fi>, linux-kernel@...r.kernel.org
Subject: Re: [patch 1/2] slub: move min_partial to struct kmem_cach

On Mon, 23 Feb 2009, Christoph Lameter wrote:

> > The second patch in this series as a /sys/kernel/slab/cache/min_partial
> > tunable that uses calculate_min_partial() to enforce a sane range, so
> > while it may not actually be doing any calculations, the ilog2() is
> > appropriately placed in kmem_cache_open().  We don't want to be taking the
> > log of the user's min_partial value.
> 
> Then Rename the function to set_min_partial()?
> 

I don't have any strong opinions as to the specific name, so I'll leave 
this up to Pekka.  set_min_partial(), to me, seems to indicate that 
s->min_partial will unconditionally set to the value passed, which isn't 
necessarily true.


slub: rename calculate_min_partial() to set_min_partial()

Cc: Christoph Lameter <cl@...ux-foundation.org>
Signed-off-by: David Rientjes <rientjes@...gle.com>
---
 mm/slub.c |    6 +++---
 1 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/mm/slub.c b/mm/slub.c
--- a/mm/slub.c
+++ b/mm/slub.c
@@ -2170,7 +2170,7 @@ static int init_kmem_cache_nodes(struct kmem_cache *s, gfp_t gfpflags)
 }
 #endif
 
-static void calculate_min_partial(struct kmem_cache *s, unsigned long min)
+static void set_min_partial(struct kmem_cache *s, unsigned long min)
 {
 	if (min < MIN_PARTIAL)
 		min = MIN_PARTIAL;
@@ -2321,7 +2321,7 @@ static int kmem_cache_open(struct kmem_cache *s, gfp_t gfpflags,
 	 * The larger the object size is, the more pages we want on the partial
 	 * list to avoid pounding the page allocator excessively.
 	 */
-	calculate_min_partial(s, ilog2(s->size));
+	set_min_partial(s, ilog2(s->size));
 	s->refcount = 1;
 #ifdef CONFIG_NUMA
 	s->remote_node_defrag_ratio = 1000;
@@ -3854,7 +3854,7 @@ static ssize_t min_partial_store(struct kmem_cache *s, const char *buf,
 	if (err)
 		return err;
 
-	calculate_min_partial(s, min);
+	set_min_partial(s, min);
 	return length;
 }
 SLAB_ATTR(min_partial);
--
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