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From: Peter Zijlstra <a.p.zijlstra@chello.nl>
To: linux-kernel@vger.kernel.org, netdev@vger.kernel.org, linux-mm@kvack.org
Cc: David Miller <davem@davemloft.net>,
	Peter Zijlstra <a.p.zijlstra@chello.nl>
Subject: [PATCH 8/9] slab: kmem_cache_objs_to_pages()
Date: Tue, 16 Jan 2007 10:46:05 +0100	[thread overview]
Message-ID: <20070116101815.999600000@taijtu.programming.kicks-ass.net> (raw)
In-Reply-To: <20070116094557.494892000@taijtu.programming.kicks-ass.net>

[-- Attachment #1: kmem_cache_objs_to_pages.patch --]
[-- Type: text/plain, Size: 1426 bytes --]

Provide a method to calculate the number of pages needed to store a given
number of slab objects (upper bound when considering possible partial and
free slabs).

Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
---
 include/linux/slab.h |    1 +
 mm/slab.c            |    6 ++++++
 2 files changed, 7 insertions(+)

Index: linux-2.6-git/include/linux/slab.h
===================================================================
--- linux-2.6-git.orig/include/linux/slab.h	2007-01-09 11:28:32.000000000 +0100
+++ linux-2.6-git/include/linux/slab.h	2007-01-09 11:30:16.000000000 +0100
@@ -43,6 +43,7 @@ typedef struct kmem_cache kmem_cache_t _
  */
 void __init kmem_cache_init(void);
 extern int slab_is_available(void);
+extern unsigned int kmem_cache_objs_to_pages(struct kmem_cache *, int);
 
 struct kmem_cache *kmem_cache_create(const char *, size_t, size_t,
 			unsigned long,
Index: linux-2.6-git/mm/slab.c
===================================================================
--- linux-2.6-git.orig/mm/slab.c	2007-01-09 11:30:00.000000000 +0100
+++ linux-2.6-git/mm/slab.c	2007-01-09 11:30:16.000000000 +0100
@@ -4482,3 +4482,9 @@ unsigned int ksize(const void *objp)
 
 	return obj_size(virt_to_cache(objp));
 }
+
+unsigned int kmem_cache_objs_to_pages(struct kmem_cache *cachep, int nr)
+{
+	return ((nr + cachep->num - 1) / cachep->num) << cachep->gfporder;
+}
+EXPORT_SYMBOL_GPL(kmem_cache_objs_to_pages);

-- 


  parent reply	other threads:[~2007-01-16 10:28 UTC|newest]

Thread overview: 32+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2007-01-16  9:45 [PATCH 0/9] VM deadlock avoidance -v10 Peter Zijlstra
2007-01-16  9:45 ` [PATCH 1/9] mm: page allocation rank Peter Zijlstra
2007-01-16  9:45 ` [PATCH 2/9] mm: slab allocation fairness Peter Zijlstra
2007-01-16  9:46 ` [PATCH 3/9] mm: allow PF_MEMALLOC from softirq context Peter Zijlstra
2007-01-16  9:46 ` [PATCH 4/9] mm: serialize access to min_free_kbytes Peter Zijlstra
2007-01-16  9:46 ` [PATCH 5/9] mm: emergency pool Peter Zijlstra
2007-01-16  9:46 ` [PATCH 6/9] mm: __GFP_EMERGENCY Peter Zijlstra
2007-01-16  9:46 ` [PATCH 7/9] mm: allow mempool to fall back to memalloc reserves Peter Zijlstra
2007-01-16  9:46 ` Peter Zijlstra [this message]
2007-01-16  9:46 ` [PATCH 9/9] net: vm deadlock avoidance core Peter Zijlstra
2007-01-16 13:25   ` Evgeniy Polyakov
2007-01-16 13:47     ` Peter Zijlstra
2007-01-16 15:33       ` Evgeniy Polyakov
2007-01-16 16:08         ` Peter Zijlstra
2007-01-17  4:54           ` Evgeniy Polyakov
2007-01-17  9:07             ` Peter Zijlstra
2007-01-18 10:41               ` Evgeniy Polyakov
2007-01-18 12:18                 ` Peter Zijlstra
2007-01-18 13:58                   ` Possible ways of dealing with OOM conditions Evgeniy Polyakov
2007-01-18 15:10                     ` Peter Zijlstra
2007-01-18 15:50                       ` Evgeniy Polyakov
2007-01-18 17:31                         ` Peter Zijlstra
2007-01-18 18:34                           ` Evgeniy Polyakov
2007-01-19 12:53                             ` Peter Zijlstra
2007-01-19 22:56                               ` Evgeniy Polyakov
2007-01-20 22:36                                 ` Rik van Riel
2007-01-21  1:46                                   ` Evgeniy Polyakov
2007-01-21  2:14                                     ` Evgeniy Polyakov
2007-01-21 16:30                                     ` Rik van Riel
2007-01-19 17:54                           ` Christoph Lameter
2007-01-17  9:12 ` [PATCH 0/9] VM deadlock avoidance -v10 Pavel Machek
2007-01-17  9:20   ` Peter Zijlstra

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