Re: [PATCH] timers: Recalculate next timer interrupt only when necessary

[Thomas Gleixner]

Frederic Weisbecker <frederic@xxxxxxxxxx> writes:
>
> Since recalculating the next_expiry isn't a free operation, especially
> when we must climb up the last wheel level to find out that no timer
> has

I'm climbing stairs or mountains :)

> been enqueued at all, lets reuse the next expiry cache when it is
> known

lets? Come on, the changelog is about facts not what we might do.

>  	unsigned long		clk;
>  	unsigned long		next_expiry;
> +	bool			next_expiry_recalc;
>  	unsigned int		cpu;
>  	bool			is_idle;

Care to stare at the output of

     pahole -C timer_base kernel/time/timer.o

before and after?

Thanks,

        tglx