RE: [PATCH] clocksource/drivers/arc_timer: Utilize generic sched_clock

2018-10-16 Thread Alexey Brodkin
Hi Vineet, > -Original Message- > From: Vineet Gupta > Sent: Tuesday, October 16, 2018 7:03 PM > To: Alexey Brodkin ; linux-ker...@vger.kernel.org > Cc: linux-snps-arc@lists.infradead.org; Daniel Lezcano > ; Thomas Gleixner > Subject: Re: [PATCH] clocksource/drive

Re: [PATCH] clocksource/drivers/arc_timer: Utilize generic sched_clock

2018-10-16 Thread Vineet Gupta
On 10/16/2018 12:45 AM, Alexey Brodkin wrote: > It turned out we used to use default implementation of sched_clock() > from kernel/sched/clock.c which was as precise as 1/HZ, i.e. > by default we had 10 msec granularity of time measurement. > > Now given ARC built-in timers are clocked with the sam

[PATCH] clocksource/drivers/arc_timer: Utilize generic sched_clock

2018-10-16 Thread Alexey Brodkin
It turned out we used to use default implementation of sched_clock() from kernel/sched/clock.c which was as precise as 1/HZ, i.e. by default we had 10 msec granularity of time measurement. Now given ARC built-in timers are clocked with the same frequency as CPU cores we may get much higher precisi