On Mon, Nov 29, 2021 at 04:34:07PM +, Michał Mirosław wrote:
> Dnia 29 listopada 2021 06:38:39 UTC, Yury Norov
> napisał/a:
> >On Sun, Nov 28, 2021 at 07:03:41PM +0100, mirq-t...@rere.qmqm.pl wrote:
> >> On Sat, Nov 27, 2021 at 07:56:55PM -0800, Yury Norov wrote:
> >> > In many cases people u
On Sun, Nov 28, 2021 at 07:03:41PM +0100, mirq-t...@rere.qmqm.pl wrote:
> On Sat, Nov 27, 2021 at 07:56:55PM -0800, Yury Norov wrote:
> > In many cases people use bitmap_weight()-based functions like this:
> >
> > if (num_present_cpus() > 1)
> > do_something();
> >
> > This may ta
On Sun, Nov 28, 2021 at 09:08:41PM +1000, Nicholas Piggin wrote:
> Excerpts from Yury Norov's message of November 28, 2021 1:56 pm:
> > In many cases people use bitmap_weight()-based functions like this:
> >
> > if (num_present_cpus() > 1)
> > do_something();
> >
> > This may take
Excerpts from Yury Norov's message of November 28, 2021 1:56 pm:
> In many cases people use bitmap_weight()-based functions like this:
>
> if (num_present_cpus() > 1)
> do_something();
>
> This may take considerable amount of time on many-cpus machines because
> num_present_cp
In many cases people use bitmap_weight()-based functions like this:
if (num_present_cpus() > 1)
do_something();
This may take considerable amount of time on many-cpus machines because
num_present_cpus() will traverse every word of underlying cpumask
unconditionally.
We ca
