From: Peter Zijlstra <peterz@infradead.org>
To: Frederic Weisbecker <frederic@kernel.org>
Cc: linux-kernel@vger.kernel.org,
"Paolo Bonzini" <pbonzini@redhat.com>,
"Radim Krčmář" <rkrcmar@redhat.com>,
"Wanpeng Li" <wanpengli@tencent.com>,
"Borislav Petkov" <bp@alien8.de>,
"Thomas Gleixner" <tglx@linutronix.de>,
"Sean Christopherson" <sean.j.christopherson@intel.com>,
"Ingo Molnar" <mingo@redhat.com>,
"Jim Mattson" <jmattson@google.com>,
"Joerg Roedel" <joro@8bytes.org>,
"Andy Lutomirski" <luto@kernel.org>,
"Vitaly Kuznetsov" <vkuznets@redhat.com>
Subject: Re: [PATCH 0/2] x86/context-tracking: Remove last remaining calls to exception_enter/exception_exit()
Date: Mon, 6 Jan 2020 16:05:46 +0100 [thread overview]
Message-ID: <20200106150546.GS2810@hirez.programming.kicks-ass.net> (raw)
In-Reply-To: <20191227163612.10039-1-frederic@kernel.org>
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().
next prev parent reply other threads:[~2020-01-06 15:06 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-12-27 16:36 [PATCH 0/2] x86/context-tracking: Remove last remaining calls to exception_enter/exception_exit() Frederic Weisbecker
2019-12-27 16:36 ` [PATCH 1/2] x86/context-tracking: Remove exception_enter/exit() from do_page_fault() Frederic Weisbecker
2020-01-07 7:36 ` [tip: x86/asm] " tip-bot2 for Frederic Weisbecker
2019-12-27 16:36 ` [PATCH 2/2] x86/context-tracking: Remove exception_enter/exit() from KVM_PV_REASON_PAGE_NOT_PRESENT async page fault Frederic Weisbecker
2020-01-07 7:36 ` [tip: x86/asm] " tip-bot2 for Frederic Weisbecker
2020-01-06 15:05 ` Peter Zijlstra [this message]
2020-01-06 15:58 ` [PATCH 0/2] x86/context-tracking: Remove last remaining calls to exception_enter/exception_exit() Frederic Weisbecker
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