From: Marcelo Tosatti <marcelo.tosatti@cyclades.com>
To: Andrea Arcangeli <andrea@suse.de>
Cc: Nick Piggin <nickpiggin@yahoo.com.au>,
linux-kernel@vger.kernel.org,
Thomas Gleixner <tglx@linutronix.de>,
Andrew Morton <akpm@osdl.org>
Subject: Re: VM fixes [2/4]
Date: Mon, 3 Jan 2005 10:25:18 -0200 [thread overview]
Message-ID: <20050103122518.GF29158@logos.cnet> (raw)
In-Reply-To: <20050102163236.GI5164@dualathlon.random>
On Sun, Jan 02, 2005 at 05:32:36PM +0100, Andrea Arcangeli wrote:
> On Fri, Dec 31, 2004 at 08:12:42AM +1100, Nick Piggin wrote:
> > Andrea Arcangeli wrote:
> > >This is the forward port to 2.6 of the lowmem_reserved algorithm I
> > >invented in 2.4.1*, merged in 2.4.2x already and needed to fix workloads
> > >like google (especially without swap) on x86 with >1G of ram, but it's
> > >needed in all sort of workloads with lots of ram on x86, it's also
> > >needed on x86-64 for dma allocations. This brings 2.6 in sync with
> > >latest 2.4.2x.
> > >
> >
> > This looks OK to me. It really simplifies the code there a lot too.
> >
> > The only questions I have are: should it be on by default? I don't think
> > we ever reached an agreement. I'd say yes, after a run in -mm because it
> > does potentially fix corner cases where lower zones get filled with un-
> > freeable memory which could have been satisfied with higher zones.
>
> Great, thanks for the review! I definitely agree it should be on by
> default, I already had an hang report that was solved by more recent
> kernels and that probably can only be explained by lowmem_reserve since
> there aren't other mm changes in 2.6.5 based trees.
>
> > And second, any chance you could you port it to the mm patches already in
> > -mm? Won't be a big job, just some clashes in __alloc_pages...
>
> I already had to port to 2.6.5 too, and that's enough for now unless I
> first get a positive ack that it will be merged (if I hadn't more
> interesting things to develop, I would be happily porting it).
I believe it can be accepted easily if you change the variable names
from protection to lowmem_reserve.
Is there a need for that or its just your taste? :)
next prev parent reply other threads:[~2005-01-03 15:29 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-12-24 17:35 VM fixes [2/4] Andrea Arcangeli
2004-12-30 21:12 ` Nick Piggin
2005-01-02 16:32 ` Andrea Arcangeli
2005-01-03 12:25 ` Marcelo Tosatti [this message]
2005-01-03 16:30 ` Andrea Arcangeli
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20050103122518.GF29158@logos.cnet \
--to=marcelo.tosatti@cyclades.com \
--cc=akpm@osdl.org \
--cc=andrea@suse.de \
--cc=linux-kernel@vger.kernel.org \
--cc=nickpiggin@yahoo.com.au \
--cc=tglx@linutronix.de \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).