Messages in this thread | | | Subject | RE: [PATCH 1/4] [mm] buddy page allocator: add tunable big order allocation | Date | Tue, 13 May 2008 12:42:13 +0100 | From | "Hennerich, Michael" <> |
| |
>-----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.
Best regards, Michael
> >> --- >> init/Kconfig | 9 +++++++++ >> mm/page_alloc.c | 2 +- >> 2 files changed, 10 insertions(+), 1 deletions(-) >> >> diff --git a/init/Kconfig b/init/Kconfig >> index 6135d07..b6ff75b 100644 >> --- a/init/Kconfig >> +++ b/init/Kconfig >> @@ -742,6 +742,15 @@ config SLUB_DEBUG >> SLUB sysfs support. /sys/slab will not exist and there will be >> no support for cache validation etc. >> >> +config BIG_ORDER_ALLOC_NOFAIL_MAGIC >> + int "Big Order Allocation No FAIL Magic" >> + depends on EMBEDDED >> + range 3 10 >> + default 3 >> + help >> + Let big-order allocations loop until memory gets free. Specified >Value >> + expresses the order. >> + >I think it's better to add a text to explain why this is for EMBEDED. > >Thanks, >-Kame
| |