From: Christoph Lameter <clameter@sgi.com>
To: Rohit Seth <rohitseth@google.com>
Cc: 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: Mon, 12 Jun 2006 09:43:17 -0700 (PDT) [thread overview]
Message-ID: <Pine.LNX.4.64.0606120941500.19214@schroedinger.engr.sgi.com> (raw)
In-Reply-To: <1149903235.31417.84.camel@galaxy.corp.google.com>
On Fri, 9 Jun 2006, Rohit Seth wrote:
> There is currently /proc/<pid>/smaps that prints the detailed
> information about the usage of physical pages but that is a very
> expensive operation as it traverses all the PTs (for some one who is
> just interested in getting that data for each vma).
Adding a new counter to a vma may cause a bouncing cacheline etc. I
would think that such a counter is far more expensive than occasional
scans through the page table because someone is curious about the
number of page in use. /proc/<pid>/numa_maps also uses these scans to
determine dirty pages etc.
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next prev parent reply other threads:[~2006-06-12 16:43 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
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 [this message]
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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