Subject: RE: [PATCH V2] arm64: psci: Reduce waiting time of cpu_psci_cpu_kill()

From: David Laight <[email-masked]>
Date: Thu, 17 Oct 2019 14:00:42 +0000

From: Yunfeng Ye
> Sent: 17 October 2019 14:26
...
> >> -	for (i = 0; i < 10; i++) {
> >> +	i = 0;
> >> +	timeout = jiffies + msecs_to_jiffies(100);
> >> +	do {
> >>  		err = psci_ops.affinity_info(cpu_logical_map(cpu), 0);
> >>  		if (err == PSCI_0_2_AFFINITY_LEVEL_OFF) {
> >>  			pr_info("CPU%d killed.\n", cpu);
> >>  			return 0;
> >>  		}
> >>
> >> -		msleep(10);
> >> -		pr_info("Retrying again to check for CPU kill\n");
> >
> > You dropped this message, any particular reason ?
> >
> When reduce the time interval to 1ms, the print message maybe increase 10 times.
> on the other hand, cpu_psci_cpu_kill() will print message on success or failure, which
> this retry log is not very necessary. of cource, I think use pr_info_once() instead of
> pr_info() is better.

Maybe you should print in on (say) the 10th time around the loop.

	David

-
Registered Address Lakeside, Bramley Road, Mount Farm, Milton Keynes, MK1 1PT, UK
Registration No: 1397386 (Wales)
_______________________________________________
linux-arm-kernel mailing list
[email-masked]
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel