Re: [PATCH 0/2] x86/context-tracking: Remove last remaining calls to exception_enter/exception_exit()

From: Peter Zijlstra
Date: Mon Jan 06 2020 - 10:06:18 EST

On Fri, Dec 27, 2019 at 05:36:10PM +0100, Frederic Weisbecker wrote:
> Thanks to the cleanups from Andy Lutomirski over the years, those calls
> can now be removed. This will allow for nice things in the future for
> x86 support on full nohz:
> * Remove TIF_NOHZ and use a per-cpu switch to enable, disable context
> tracking.
> * Avoid context tracking on housekeepers.
> * Dynamically enable/disable context tracking on CPU on runtime and
> therefore allow runtime enable/disable of nohz_full
> * Make nohz_full a property of cpuset.
> Frederic Weisbecker (2):
> x86/context-tracking: Remove exception_enter/exit() from
> do_page_fault()
> x86/context-tracking: Remove exception_enter/exit() from

Thanks, these look good to me.

Did I tell you about my 'TODO' item vs text_poke_sync() ? Basically, we
can avoid sending the IPI to NOHZ_FULL user CPUs, provided we make their
enter_from_user_mode() do the sync_core().