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From: William Lee Irwin III <wli@holomorphy.com>
To: Nick Piggin <nickpiggin@yahoo.com.au>
Cc: Adam Litke <agl@us.ibm.com>,
	Andrew Morton <akpm@linux-foundation.org>,
	Arjan van de Ven <arjan@infradead.org>,
	Christoph Hellwig <hch@infradead.org>,
	Ken Chen <kenchen@google.com>,
	linux-mm@kvack.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH 1/7] Introduce the pagetable_operations and associated helper macros.
Date: Wed, 21 Mar 2007 16:32:27 -0700	[thread overview]
Message-ID: <20070321233227.GK2986@holomorphy.com> (raw)
In-Reply-To: <4601B96F.2080707@yahoo.com.au>

Adam Litke wrote:
>> We didn't want to bloat the size of the vm_ops struct for all of its
>> users.

On Thu, Mar 22, 2007 at 10:02:07AM +1100, Nick Piggin wrote:
> But vmas are surely far more numerous than vm_ops, aren't they?

It should be clarified that the pointer to the operations structure
in once-per-mmap() vmas is a bigger overhead than once-per-driver
function pointers in the vm_ops structure.


-- wli

WARNING: multiple messages have this Message-ID (diff)
From: William Lee Irwin III <wli@holomorphy.com>
To: Nick Piggin <nickpiggin@yahoo.com.au>
Cc: Adam Litke <agl@us.ibm.com>,
	Andrew Morton <akpm@linux-foundation.org>,
	Arjan van de Ven <arjan@infradead.org>,
	Christoph Hellwig <hch@infradead.org>,
	Ken Chen <kenchen@google.com>,
	linux-mm@kvack.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH 1/7] Introduce the pagetable_operations and associated helper macros.
Date: Wed, 21 Mar 2007 16:32:27 -0700	[thread overview]
Message-ID: <20070321233227.GK2986@holomorphy.com> (raw)
In-Reply-To: <4601B96F.2080707@yahoo.com.au>

Adam Litke wrote:
>> We didn't want to bloat the size of the vm_ops struct for all of its
>> users.

On Thu, Mar 22, 2007 at 10:02:07AM +1100, Nick Piggin wrote:
> But vmas are surely far more numerous than vm_ops, aren't they?

It should be clarified that the pointer to the operations structure
in once-per-mmap() vmas is a bigger overhead than once-per-driver
function pointers in the vm_ops structure.


-- wli

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  reply	other threads:[~2007-03-21 23:37 UTC|newest]

Thread overview: 92+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2007-03-19 20:05 [PATCH 0/7] [RFC] hugetlb: pagetable_operations API (V2) Adam Litke
2007-03-19 20:05 ` Adam Litke
2007-03-19 20:05 ` [PATCH 1/7] Introduce the pagetable_operations and associated helper macros Adam Litke
2007-03-19 20:05   ` Adam Litke
2007-03-20 23:24   ` Dave Hansen
2007-03-20 23:24     ` Dave Hansen
2007-03-21 14:50     ` Adam Litke
2007-03-21 14:50       ` Adam Litke
2007-03-21 15:05       ` Arjan van de Ven
2007-03-21 15:05         ` Arjan van de Ven
2007-03-21  4:18   ` Nick Piggin
2007-03-21  4:18     ` Nick Piggin
2007-03-21  4:52     ` William Lee Irwin III
2007-03-21  4:52       ` William Lee Irwin III
2007-03-21  5:07       ` Nick Piggin
2007-03-21  5:07         ` Nick Piggin
2007-03-21  5:41         ` William Lee Irwin III
2007-03-21  5:41           ` William Lee Irwin III
2007-03-21  6:51           ` Nick Piggin
2007-03-21  6:51             ` Nick Piggin
2007-03-21  7:36             ` Nick Piggin
2007-03-21  7:36               ` Nick Piggin
2007-03-21 10:46             ` William Lee Irwin III
2007-03-21 10:46               ` William Lee Irwin III
2007-03-21 15:17     ` Adam Litke
2007-03-21 15:17       ` Adam Litke
2007-03-21 16:00       ` Christoph Hellwig
2007-03-21 16:00         ` Christoph Hellwig
2007-03-21 23:03         ` Nick Piggin
2007-03-21 23:03           ` Nick Piggin
2007-03-21 23:02       ` Nick Piggin
2007-03-21 23:02         ` Nick Piggin
2007-03-21 23:32         ` William Lee Irwin III [this message]
2007-03-21 23:32           ` William Lee Irwin III
2007-03-19 20:05 ` [PATCH 2/7] copy_vma for hugetlbfs Adam Litke
2007-03-19 20:05   ` Adam Litke
2007-03-19 20:05 ` [PATCH 3/7] pin_pages for hugetlb Adam Litke
2007-03-19 20:05   ` Adam Litke
2007-03-19 20:05 ` [PATCH 4/7] unmap_page_range " Adam Litke
2007-03-19 20:05   ` Adam Litke
2007-03-20 23:27   ` Dave Hansen
2007-03-20 23:27     ` Dave Hansen
2007-03-19 20:05 ` [PATCH 5/7] change_protection " Adam Litke
2007-03-19 20:05   ` Adam Litke
2007-03-19 20:06 ` [PATCH 6/7] free_pgtable_range " Adam Litke
2007-03-19 20:06   ` Adam Litke
2007-03-19 20:06 ` [PATCH 7/7] hugetlbfs fault handler Adam Litke
2007-03-19 20:06   ` Adam Litke
2007-03-20 23:50 ` [PATCH 0/7] [RFC] hugetlb: pagetable_operations API (V2) Dave Hansen
2007-03-20 23:50   ` Dave Hansen
2007-03-21  1:17 ` William Lee Irwin III
2007-03-21  1:17   ` William Lee Irwin III
2007-03-21 15:55 ` Hugh Dickins
2007-03-21 15:55   ` Hugh Dickins
2007-03-21 16:01   ` Christoph Hellwig
2007-03-21 16:01     ` Christoph Hellwig
2007-03-21 16:23   ` William Lee Irwin III
2007-03-21 17:08     ` Hugh Dickins
2007-03-21 17:42       ` William Lee Irwin III
2007-03-21 19:43 ` pagetable_ops: Hugetlb character device example Adam Litke
2007-03-21 19:43   ` Adam Litke
2007-03-21 19:51   ` Valdis.Kletnieks
2007-03-21 20:26     ` Adam Litke
2007-03-21 20:26       ` Adam Litke
2007-03-21 22:26     ` William Lee Irwin III
2007-03-21 22:26       ` William Lee Irwin III
2007-03-21 22:53       ` Matt Mackall
2007-03-21 22:53         ` Matt Mackall
2007-03-21 23:35         ` William Lee Irwin III
2007-03-21 23:35           ` William Lee Irwin III
2007-03-22  0:31           ` Matt Mackall
2007-03-22  0:31             ` Matt Mackall
2007-03-22 10:38   ` Christoph Hellwig
2007-03-22 10:38     ` Christoph Hellwig
2007-03-22 15:42     ` Mel Gorman
2007-03-22 15:42       ` Mel Gorman
2007-03-22 18:15       ` Christoph Hellwig
2007-03-22 18:15         ` Christoph Hellwig
2007-03-23 14:57         ` Mel Gorman
2007-03-23 14:57           ` Mel Gorman
  -- strict thread matches above, loose matches on Subject: below --
2007-02-19 18:31 [PATCH 0/7] [RFC] hugetlb: pagetable_operations API Adam Litke
2007-02-19 18:31 ` [PATCH 1/7] Introduce the pagetable_operations and associated helper macros Adam Litke
2007-02-19 18:31   ` Adam Litke
2007-02-19 18:41   ` Arjan van de Ven
2007-02-19 18:41     ` Arjan van de Ven
2007-02-19 19:31     ` Adam Litke
2007-02-19 19:31       ` Adam Litke
2007-02-19 19:48   ` William Lee Irwin III
2007-02-19 19:48     ` William Lee Irwin III
2007-02-19 22:29   ` Christoph Hellwig
2007-02-19 22:29     ` Christoph Hellwig
2007-02-20 15:50     ` Mel Gorman
2007-02-20 15:50       ` Mel Gorman

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