Re: [RFC][PATCH 1/8] sched,idle,alpha: Switch from TS_POLLING to TIF_POLLING_NRFLAG

[Richard Henderson]

On 04/11/2014 06:42 AM, Peter Zijlstra wrote:
> Standardize the idle polling indicator to TIF_POLLING_NRFLAG such that
> both TIF_NEED_RESCHED and TIF_POLLING_NRFLAG are in the same word.
> This will allow us, using fetch_or(), to both set NEED_RESCHED and
> check for POLLING_NRFLAG in a single operation and avoid pointless
> wakeups.
> 
> Changing from the non-atomic thread_info::status flags to the atomic
> thread_info::flags shouldn't be a big issue since most polling state
> changes were followed/preceded by a full memory barrier anyway.
> 
> Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
> Cc: Andy Lutomirski <luto@xxxxxxxxxxxxxx>
> Cc: Richard Henderson <rth@xxxxxxxxxxx>
> Signed-off-by: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
> ---
>  arch/alpha/include/asm/thread_info.h |    4 ++--
>  1 file changed, 2 inser

Acked-by: Richard Henderson <rth@xxxxxxxxxxx>


r~
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