Messages in this thread | | | From | Thomas Gleixner <> | Subject | Re: [PATCH] x86/cpu: use smp_call_function_many() in arch_freq_prepare_all() | Date | Wed, 30 Mar 2022 19:02:36 +0200 |
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On Wed, Mar 30 2022 at 09:51, Eric Dumazet wrote: > On Wed, Mar 30, 2022 at 8:58 AM Thomas Gleixner <tglx@linutronix.de> 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...
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