linux-kernel - Re: [PATCH 2/3] vmscan: make mapped executable pages the first class citizen

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Date:	Mon, 8 Jun 2009 23:02:46 +0800
From:	Nai Xia <nai.xia@...il.com>
To:	Wu Fengguang <fengguang.wu@...el.com>
Cc:	"gnome-list@...me.org" <gnome-list@...me.org>,
	Andi Kleen <andi@...stfloor.org>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	Christoph Lameter <cl@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Elladan <elladan@...imo.com>, Nick Piggin <npiggin@...e.de>,
	Johannes Weiner <hannes@...xchg.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Rik van Riel <riel@...hat.com>,
	"tytso@....edu" <tytso@....edu>,
	"linux-mm@...ck.org" <linux-mm@...ck.org>,
	"minchan.kim@...il.com" <minchan.kim@...il.com>,
	"xorg@...ts.freedesktop.org" <xorg@...ts.freedesktop.org>
Subject: Re: [PATCH 2/3] vmscan: make mapped executable pages the first class 
	citizen

On Mon, Jun 8, 2009 at 8:46 PM, Wu Fengguang<fengguang.wu@...el.com> wrote:
> On Mon, Jun 08, 2009 at 08:14:53PM +0800, Nai Xia wrote:
>> On Wed, May 20, 2009 at 11:38 PM, Wu Fengguang<fengguang.wu@...el.com> wrote:
>> > Hi list,
>> >
>> > On Wed, May 20, 2009 at 10:56:07PM +0800, Wu Fengguang wrote:
>> >> On Wed, May 20, 2009 at 10:47:31PM +0800, Andi Kleen wrote:
>> >> > > > One scenario that might be useful to test is what happens when some
>> >> > > > very large processes, all mapped and executable exceed memory and
>> >> > >
>> >> > > Good idea. Too bad I may have to install some bloated desktop in order
>> >> > > to test this out ;) I guess the pgmajfault+pswpin numbers can serve as
>> >> > > negative scores in that case?
>> >> >
>> >> > I would just generate a large C program with a script and compile
>> >> > and run that. The program can be very dumb (e.g. only run
>> >> > a gigantic loop), it just needs to be large.
>> >> >
>> >> > Just don't compile it with optimization, that can be quite slow.
>> >> >
>> >> > And use multiple functions, otherwise gcc might exceed your memory.
>> >>
>> >>
>> >> Hehe, an arbitrary C program may not be persuasive..but I do have some
>> >> bloated binaries at hand :-)
>> >>
>> >> -rwsr-sr-x 1 root wfg   36M 2009-04-22 17:21 Xorg
>> >> lrwxrwxrwx 1 wfg  wfg     4 2009-04-22 17:21 X -> Xorg
>> >> -rwxr-xr-x 1 wfg  wfg   39M 2009-04-22 17:21 Xvfb
>> >> -rwxr-xr-x 1 wfg  wfg   35M 2009-04-22 17:21 Xnest
>> >
>> > I would like to create a lot of windows in gnome, and to switch
>> > between them. Any ideas on scripting/automating the "switch window"
>> > actions?
>>
>> You can easily do this in KDE 3.5 with dcop(Desktop Communications Protocol)\
>>
>> e.g.
>>
>> $dcop kchmviewer-17502 KCHMMainWindow raise
>>
>> will raise the window of my kchmviewer.
>
> Thank you, it's a good tip :)
>
> The alternative I found is wmctrl:
>
> Description: control an EWMH/NetWM compatible X Window Manager
>  Wmctrl is a command line tool to interact with an
>  EWMH/NetWM compatible X Window Manager (examples include
>  Enlightenment, icewm, kwin, metacity, and sawfish).
>  .
>  Wmctrl provides command line access to almost all the features
>  defined in the EWMH specification. For example it can maximize
>  windows, make them sticky, set them to be always on top. It can
>  switch and resize desktops and perform many other useful
>  operations.

Cool, thanks for the information. :)

BTW, may be you should make sure that 90% of the  overhead
when doing crazy window switches is NOT caused by a dumb graphics
driver (e.g. the widely hated ATI official driver!). hehe

>
> Thanks,
> Fengguang
>
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