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Message-ID: <20200106150546.GS2810@hirez.programming.kicks-ass.net>
Date: Mon, 6 Jan 2020 16:05:46 +0100
From: Peter Zijlstra <peterz@...radead.org>
To: Frederic Weisbecker <frederic@...nel.org>
Cc: linux-kernel@...r.kernel.org, Paolo Bonzini <pbonzini@...hat.com>,
Radim Krčmář <rkrcmar@...hat.com>,
Wanpeng Li <wanpengli@...cent.com>,
Borislav Petkov <bp@...en8.de>,
Thomas Gleixner <tglx@...utronix.de>,
Sean Christopherson <sean.j.christopherson@...el.com>,
Ingo Molnar <mingo@...hat.com>,
Jim Mattson <jmattson@...gle.com>,
Joerg Roedel <joro@...tes.org>,
Andy Lutomirski <luto@...nel.org>,
Vitaly Kuznetsov <vkuznets@...hat.com>
Subject: Re: [PATCH 0/2] x86/context-tracking: Remove last remaining calls to
exception_enter/exception_exit()
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
> KVM_PV_REASON_PAGE_NOT_PRESENT async page fault
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().
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