Re: [PATCH] sched/nohz: Optimize get nohz timer target

On Wed, Jun 19, 2019 at 08:42:19AM +0800, Wanpeng Li wrote: > Cc Frederic, > On Tue, 18 Jun 2019 at 11:13, Wanpeng Li wrote: > > > > From: Wanpeng Li > > > > On a machine, cpu 0 is used for housekeeping, other 39 cpus are in > > nohz_full mode. We can observe huge time burn in the loop for

Re: [PATCH] sched/nohz: Optimize get nohz timer target

Cc Frederic, On Tue, 18 Jun 2019 at 11:13, Wanpeng Li wrote: > > From: Wanpeng Li > > On a machine, cpu 0 is used for housekeeping, other 39 cpus are in > nohz_full mode. We can observe huge time burn in the loop for seaching > nearest busy housekeeper cpu by ftrace. > > 2) |

[PATCH] sched/nohz: Optimize get nohz timer target

From: Wanpeng Li On a machine, cpu 0 is used for housekeeping, other 39 cpus are in nohz_full mode. We can observe huge time burn in the loop for seaching nearest busy housekeeper cpu by ftrace. 2) |get_nohz_timer_target() { 2) 0.240 us|