Re: [PATCH] x86/cpu: use smp_call_function_many() in arch_freq_prepare_all()

[Eric Dumazet]

On Wed, Mar 30, 2022 at 10:02 AM Thomas Gleixner <tglx@xxxxxxxxxxxxx> wrote:
>
> On Wed, Mar 30 2022 at 09:51, Eric Dumazet wrote:
> > On Wed, Mar 30, 2022 at 8:58 AM Thomas Gleixner <tglx@xxxxxxxxxxxxx> wrote:
> >> which I hate with a passion because that allows *unpriviledged* user
> >> space to inject systemwide IPIs every 10ms just to read these counters
> >> which are providing not more than some estimate and are of no value for
> >> the only sane use case of /proc/cpuinfo, i.e. #1 above.
> >
> > You do realize that before my patch, this is already happening ?
> >
> > My "optimization" simply replace an open loop of individual IPI with
> > use of the broadcast IPI capability.
> >
> > Are you saying we should remove IPI broadcast and use loops
> > of IPI, one cpu at a time ?
>
> I rather have no IPIs at all...

Can you send an actual patch, with a changelog then ?

I saw kind of a rant about my patch, which was fine IMO.

Sorry.