From: Nick Piggin <nickpiggin@yahoo.com.au>
To: Andi Kleen <ak@suse.de>
Cc: rohitseth@google.com, Andrew Morton <akpm@osdl.org>,
Linux-mm@kvack.org, Linux-kernel@vger.kernel.org
Subject: Re: [PATCH]: Adding a counter in vma to indicate the number of physical pages backing it
Date: Tue, 13 Jun 2006 14:27:20 +1000 [thread overview]
Message-ID: <448E3EA8.3020807@yahoo.com.au> (raw)
In-Reply-To: <200606130551.23825.ak@suse.de>
Andi Kleen wrote:
>On Monday 12 June 2006 21:42, Rohit Seth wrote:
>
>>I think having this
>>information in each vma keeps the impact (of adding new counter) to very
>>low.
>>
>>Second question is to advertize this value to user space. Please let me
>>know what suites the most among /proc, /sys or system call (or if there
>>is any other mechanism then let me know) for a per process per segment
>>related information.
>>
>
>I think we first need to identify the basic need.
>Don't see why we even need per VMA information so far.
>
Exactly. There is no question that walking page tables will be slower
than having a counter like your patch does; the question is why we
need it.
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next prev parent reply other threads:[~2006-06-13 4:27 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-06-10 1:33 Rohit Seth
2006-06-10 2:42 ` Andrew Morton
2006-06-12 17:49 ` Rohit Seth
2006-06-10 7:35 ` Nick Piggin
2006-06-11 10:15 ` Jan Engelhardt
2006-06-12 17:36 ` Rohit Seth
2006-06-12 17:58 ` Andi Kleen
2006-06-12 19:42 ` Rohit Seth
2006-06-13 3:51 ` Andi Kleen
2006-06-13 4:27 ` Nick Piggin [this message]
2006-06-13 16:59 ` Rohit Seth
2006-06-13 17:28 ` Hugh Dickins
2006-06-13 18:09 ` Rohit Seth
2006-06-13 17:31 ` Andi Kleen
2006-06-11 16:09 ` Arjan van de Ven
2006-06-12 11:17 ` Andi Kleen
2006-06-12 12:49 ` Jan Engelhardt
2006-06-12 12:54 ` Andi Kleen
2006-06-12 16:43 ` Christoph Lameter
2006-06-13 5:53 [PATCH]: Adding a counter in vma to indicate the number of physical_pages_backing it Albert Cahalan
2006-06-13 5:56 ` Andi Kleen
2006-06-13 17:10 ` Rohit Seth
2006-06-13 17:18 ` Andi Kleen
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