To: linux-kernel@vger.kernel.org
From: Jon Masters <jonathan@jonmasters.org>
Subject: Re: Kernel Event Notifications (was: [RFC] Parallelize IO for
	e2fsck)
Date: Mon, 28 Jan 2008 18:28:02 -0500
Organization: World Organi[sz]ation Of Broken Dreams
Message-ID: <1201562634.5412.70.camel@jcmlaptop>
References: <9Mo9w-7Ws-25@gated-at.bofh.it> <20080124234037.GJ15858@mit.edu>
	 <2f11576a0801260432y4405d817p6ef4005d06189654@mail.gmail.com>
	 <200801261655.31313.a1426z@gawab.com>
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On Sat, 2008-01-26 at 16:55 +0300, Al Boldi wrote:
> KOSAKI Motohiro wrote:
> > > > And from a performance point of view letting applications voluntarily
> > > > free some memory is better even than starting to swap.
> > >
> > > Absolutely.
> >
> > the mem_notify patch can realize "just before starting swapping"
> > notification :)

I looked at this a year or two back, then ran out of time. But the thing
I wanted to do was have libc's memory allocation routines extended to
handle these through reservations - the kernel should send a userspace
notification and then there should be some kind of concept of returning
memory that's been used for "opportunistic" userspace caching, e.g. in
firefox to cache the last 10 web pages. Let us know how you get on :)

Jon.


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