From: Peter Zijlstra <a.p.zijlstra@chello.nl>
To: Christoph Lameter <clameter@sgi.com>
Cc: netdev@vger.kernel.org, linux-mm@kvack.org,
David Miller <davem@davemloft.net>
Subject: Re: [RFC][PATCH 5/6] slab: kmem_cache_objs_to_pages()
Date: Thu, 30 Nov 2006 19:55:17 +0100 [thread overview]
Message-ID: <1164912917.6588.155.camel@twins> (raw)
In-Reply-To: <Pine.LNX.4.64.0611301053340.23820@schroedinger.engr.sgi.com>
On Thu, 2006-11-30 at 10:55 -0800, Christoph Lameter wrote:
> On Thu, 30 Nov 2006, Peter Zijlstra wrote:
>
> > +unsigned int kmem_cache_objs_to_pages(struct kmem_cache *cachep, int nr)
> > +{
> > + return ((nr + cachep->num - 1) / cachep->num) << cachep->gfporder;
>
> cachep->num refers to the number of objects in a slab of gfporder.
Ah, my bad, thanks!
> thus
>
> return (nr + cachep->num - 1) / cachep->num;
>
> But then this is very optimistic estimate that assumes a single node and
> no free objects in between.
Right, perhaps my bad in wording the intent; the needed information is
how many more pages would I need to grow the slab with in order to store
so many new object.
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WARNING: multiple messages have this Message-ID (diff)
From: Peter Zijlstra <a.p.zijlstra@chello.nl>
To: Christoph Lameter <clameter@sgi.com>
Cc: netdev@vger.kernel.org, linux-mm@kvack.org,
David Miller <davem@davemloft.net>
Subject: Re: [RFC][PATCH 5/6] slab: kmem_cache_objs_to_pages()
Date: Thu, 30 Nov 2006 19:55:17 +0100 [thread overview]
Message-ID: <1164912917.6588.155.camel@twins> (raw)
In-Reply-To: <Pine.LNX.4.64.0611301053340.23820@schroedinger.engr.sgi.com>
On Thu, 2006-11-30 at 10:55 -0800, Christoph Lameter wrote:
> On Thu, 30 Nov 2006, Peter Zijlstra wrote:
>
> > +unsigned int kmem_cache_objs_to_pages(struct kmem_cache *cachep, int nr)
> > +{
> > + return ((nr + cachep->num - 1) / cachep->num) << cachep->gfporder;
>
> cachep->num refers to the number of objects in a slab of gfporder.
Ah, my bad, thanks!
> thus
>
> return (nr + cachep->num - 1) / cachep->num;
>
> But then this is very optimistic estimate that assumes a single node and
> no free objects in between.
Right, perhaps my bad in wording the intent; the needed information is
how many more pages would I need to grow the slab with in order to store
so many new object.
next prev parent reply other threads:[~2006-11-30 18:55 UTC|newest]
Thread overview: 41+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-11-30 10:14 [RFC][PATCH 0/6] VM deadlock avoidance -v9 Peter Zijlstra
2006-11-30 10:14 ` [RFC][PATCH 1/6] mm: slab allocation fairness Peter Zijlstra
2006-11-30 18:52 ` Christoph Lameter
2006-11-30 18:52 ` Christoph Lameter
2006-11-30 18:55 ` Peter Zijlstra
2006-11-30 18:55 ` Peter Zijlstra
2006-11-30 19:33 ` Christoph Lameter
2006-11-30 19:33 ` Christoph Lameter
2006-11-30 19:33 ` Peter Zijlstra
2006-11-30 19:33 ` Peter Zijlstra
2006-12-01 11:28 ` Peter Zijlstra
2006-12-01 11:28 ` Peter Zijlstra
2006-11-30 19:02 ` Peter Zijlstra
2006-11-30 19:02 ` Peter Zijlstra
2006-11-30 19:37 ` Christoph Lameter
2006-11-30 19:37 ` Christoph Lameter
2006-11-30 19:40 ` Peter Zijlstra
2006-11-30 19:40 ` Peter Zijlstra
2006-11-30 20:11 ` Christoph Lameter
2006-11-30 20:11 ` Christoph Lameter
2006-11-30 20:15 ` Peter Zijlstra
2006-11-30 20:15 ` Peter Zijlstra
2006-11-30 20:29 ` Christoph Lameter
2006-11-30 20:29 ` Christoph Lameter
2006-11-30 10:14 ` [RFC][PATCH 2/6] mm: allow PF_MEMALLOC from softirq context Peter Zijlstra
2006-11-30 10:14 ` [RFC][PATCH 3/6] mm: serialize access to min_free_kbytes Peter Zijlstra
2006-11-30 10:14 ` [RFC][PATCH 4/6] mm: emergency pool and __GFP_EMERGENCY Peter Zijlstra
2006-11-30 10:14 ` [RFC][PATCH 5/6] slab: kmem_cache_objs_to_pages() Peter Zijlstra
2006-11-30 18:55 ` Christoph Lameter
2006-11-30 18:55 ` Christoph Lameter
2006-11-30 18:55 ` Peter Zijlstra [this message]
2006-11-30 18:55 ` Peter Zijlstra
2006-11-30 19:06 ` Christoph Lameter
2006-11-30 19:06 ` Christoph Lameter
2006-11-30 19:03 ` Peter Zijlstra
2006-11-30 19:03 ` Peter Zijlstra
2006-12-01 12:14 ` Peter Zijlstra
2006-12-01 12:14 ` Peter Zijlstra
2006-11-30 10:14 ` [RFC][PATCH 6/6] net: vm deadlock avoidance core Peter Zijlstra
2006-11-30 12:04 ` Peter Zijlstra
2006-11-30 12:04 ` Peter Zijlstra
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