Messages in this thread |  | | | Date | Wed, 14 May 2008 14:04:23 +0900 | | From | KAMEZAWA Hiroyuki <> | | Subject | Re: [PATCH 1/4] [mm] buddy page allocator: add tunable big order allocation | |
On Wed, 14 May 2008 12:22:35 +0800
"Bryan Wu" <cooloney@kernel.org> wrote:
> On Tue, May 13, 2008 at 7:42 PM, Hennerich, Michael
> <Michael.Hennerich@analog.com> wrote:
> >
> >
> > >-----Original Message-----
> > >From: KAMEZAWA Hiroyuki [mailto:kamezawa.hiroyu@jp.fujitsu.com]
> > >Sent: Dienstag, 13. Mai 2008 04:09
> > >To: Bryan Wu
> > >Cc: linux-kernel@vger.kernel.org; linux-mm@kvack.org;
> > dwmw2@infradead.org;
> > >Michael Hennerich
> > >Subject: Re: [PATCH 1/4] [mm] buddy page allocator: add tunable big
> > order
> > >allocation
> > >
> > >On Mon, 12 May 2008 18:32:02 +0800
> > >Bryan Wu <cooloney@kernel.org> wrote:
> > >
> > >> From: Michael Hennerich <michael.hennerich@analog.com>
> > >>
> > >> Signed-off-by: Michael Hennerich <michael.hennerich@analog.com>
> > >> Signed-off-by: Bryan Wu <cooloney@kernel.org>
> > >
> > >Does this really solve your problem ? possible hang-up is better than
> > >page allocation failure ?
> >
> > On nommu this helped quite a bit, when we run out of memory, eaten up by
> > the page cache. But yes - with this option it's likely that we sit there
> > and wait form memory that might never get available.
> >
> > We now use a better workaround for freeing up "available" memory
> > currently used as page cache.
> >
> > I think we should drop this patch.
> >
>
> OK, I dropped it. And do you think the limited page_cache patch is the
> replacement of this patch?
>
I'm not so familiar with nommu environments but have some thoughts.
one idea is
- use memory resource controller.
but this eats much amount of GFP_KERNEL memory and maybe not useful ;)
- use ZONE_MOVABLE and set lowmem_reserve_ratio value to be suitable value.
then, the page cache just uses MOVABLE zone...(maybe)
Thanks,
-Kame
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