Re: [PATCH RESEND v3] sched: Micro optimization in pick_next_task() and in check_preempt_curr()

[Peter Zijlstra]

On Fri, Dec 20, 2019 at 12:27:05AM +0300, Kirill Tkhai wrote:
> This introduces an optimization based on xxx_sched_class addresses
> in two hot scheduler functions: pick_next_task() and check_preempt_curr().
> 
> It is possible to compare pointers to sched classes to check, which
> of them has a higher priority, instead of current iterations using
> for_each_class().
> 
> One more result of the patch is that size of object file becomes a little
> less (excluding added BUG_ON(), which goes in __init section):
> 
> $size kernel/sched/core.o
>          text     data      bss	    dec	    hex	filename
> before:  66446    18957	    676	  86079	  1503f	kernel/sched/core.o
> after:   66398    18957	    676	  86031	  1500f	kernel/sched/core.o
> 
> Signed-off-by: Kirill Tkhai <ktkhai@xxxxxxxxxxxxx>

Thanks guys!