linux-kernel - Re: [PATCH 0/8] Create ZONE_MOVABLE to partition memory between movable and non-movable pages

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-Id: <1170150823.6189.203.camel@twins>
Date:	Tue, 30 Jan 2007 10:53:43 +0100
From:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
To:	Andrew Morton <akpm@...l.org>
Cc:	Christoph Lameter <clameter@....com>,
	Russell King <rmk+lkml@....linux.org.uk>,
	Mel Gorman <mel@....ul.ie>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org,
	Christoph Lameter <clameter@...r.sgi.com>
Subject: Re: [PATCH 0/8] Create ZONE_MOVABLE to partition memory between
	movable and non-movable pages

On Mon, 2007-01-29 at 16:09 -0800, Andrew Morton wrote:
> On Mon, 29 Jan 2007 15:37:29 -0800 (PST)
> Christoph Lameter <clameter@....com> wrote:
> 
> > With a alloc_pages_range() one would be able to specify upper and lower 
> > boundaries.
> 
> Is there a proposal anywhere regarding how this would be implemented?

I'm guessing this will involve page migration.

Still, would we need to place bounds on non movable pages, or will it be
a best effort? It seems the current zone approach is a best effort too,
although it does try to keep allocations away from the lower zones as
much as possible.

But I guess we could make a single zone allocator prefer high addresses
too.

So then we'd end up with a single zone, and each allocation would give a
range. Try and pick a free page with as high an address as possible in
the given range. If no pages available in the given range try and move
some movable pages out of it.

This does of course involve finding free pages in a given range, and
identifying pages as movable.

And a gazillion trivial but tedious things I've forgotten. Christoph, is
this what you were getting at?

-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/