Messages in this thread | | | Date | Fri, 9 May 2014 16:50:02 +0200 | From | Peter Zijlstra <> | Subject | Re: [RFC][PATCH 6/8] sched,idle: Avoid spurious wakeup IPIs |
| |
On Fri, May 09, 2014 at 03:40:34PM +0100, Catalin Marinas wrote:
> I wonder why we still need TIF_POLLING_NRFLAG for arm64. It was on arm > until commit 16a8016372c42c7628eb (sanitize tsk_is_polling()). On arm64 > we use wfi for idle or a firmware call but in both cases the assumption > is that we need an interrupt for waking up. > > So I think we should remove this macro for arm64.
Does ARM64 support idle=poll? If so, you could keep it for that, otherwise it does indeed appear to be pointless.
As to 32bit ARM, are there SMP chips which do not have WFI?
| |