Messages in this thread | | | Date | Wed, 3 Sep 2008 15:41:05 +0200 | From | Sebastien Dugue <> | Subject | Re: [PATCH 2/2] powerpc - Make the irq reverse mapping radix tree lockless |
| |
On Wed, 20 Aug 2008 15:23:01 +1000 Benjamin Herrenschmidt <benh@kernel.crashing.org> wrote:
> BTW. It would be good to try to turn the GFP_ATOMIC into GFP_KERNEL,
That would be nice indeed
> maybe using a semaphore instead of a lock to protect insertion vs. > initialisation.
a semaphore? are you meaning a mutex? If not, I fail to understand what you're implying.
> The old scheme was fine because if the atomic allocation > failed, it could fallback to the linear search and try again on the next > interrupt. Not anymore.
Right, that's the problem with this new scheme and I'm still trying to find a way to handle memory allocation failures be it for GFP_ATOMIC or GFP_KERNEL.
I could not think of anything simple so far and I'm open for suggestions.
Thanks,
Sebastien.
| |