From: Linus Torvalds <torvalds@linux-foundation.org>
To: Matt Mackall <mpm@selenic.com>
Cc: Andrew Morton <akpm@linux-foundation.org>,
Alexey Dobriyan <adobriyan@gmail.com>,
torvalds@linuxfoundation.org, akpm@linuxfoundation.org,
linux-kernel@vger.kernel.org,
Dave Hansen <dave@linux.vnet.ibm.com>
Subject: Re: *sigh* /proc/*/pagemap
Date: Mon, 7 Jul 2008 11:34:16 -0700 (PDT) [thread overview]
Message-ID: <alpine.LFD.1.10.0807071130540.11076@woody.linux-foundation.org> (raw)
In-Reply-To: <1215454997.11311.165.camel@calx>
On Mon, 7 Jul 2008, Matt Mackall wrote:
>
> It exists to make the VM stop being a big black box. Before now the VM
> exposed little beyond statistics, many of which are basically
> meaningless (RSS?). With pagemap, you can actually see precisely where
> things are getting allocated, how they're getting shared, etc. Think
> NUMA, think cell phones.
Umm. How about setting it under CONFIG_DEBUG_VM or something like that
then?
Right now it's not even _asked_ about, unless you're EMBEDDED, and
defaults to 'y'. Which means that it has all the downsides, an none of the
upsides, for 99.99% of all users.
Linus
next prev parent reply other threads:[~2008-07-07 18:35 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-07-05 1:07 Alexey Dobriyan
2008-07-05 1:53 ` Andrew Morton
2008-07-05 7:44 ` Alexey Dobriyan
2008-07-05 8:02 ` Andrew Morton
[not found] ` <28fa9c5e0807161906q68411e9bn5975dc277f67b086@mail.gmail.com>
2008-07-17 20:17 ` Alexey Dobriyan
2008-07-05 17:40 ` Linus Torvalds
2008-07-07 18:23 ` Matt Mackall
2008-07-07 18:34 ` Linus Torvalds [this message]
2008-07-07 18:51 ` Matt Mackall
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