linux-kernel - Re: [PATCH v2 0/2] x86/entry: speed up context-tracking system calls by 150 clock cycles

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Message-ID: <0b65e989-774b-e18f-029d-da65f326971b@redhat.com>
Date:	Tue, 28 Jun 2016 14:16:00 +0200
From:	Paolo Bonzini <pbonzini@...hat.com>
To:	linux-kernel@...r.kernel.org, kvm@...r.kernel.org
Cc:	Andy Lutomirski <luto@...nel.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Rik van Riel <riel@...hat.com>,
	"H . Peter Anvin" <hpa@...or.com>, Ingo Molnar <mingo@...nel.org>,
	Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [PATCH v2 0/2] x86/entry: speed up context-tracking system calls
 by 150 clock cycles



On 20/06/2016 16:58, Paolo Bonzini wrote:
> The first patches are the two optimizations I posted on May 30th
> for the system call entry/exit code.  The only change is in the
> function names, which use the user_{enter,exit}_irqoff favored
> by Andy and Ingo.  The first patch matches what commit d0e536d8939
> ("context_tracking: avoid irq_save/irq_restore on guest entry and exit",
> 2015-10-28) did for guest entry and exit.  The second simply adds
> an inline annotation; the compiler doesn't figure it out because the
> function is not static.
> 
> The second two patches move guest_{enter,exit} to the same naming
> convention, removing the KVM wrappers kvm_guest_{enter,exit} and
> __kvm_guest_{enter,exit} in the process.  I would like these two to
> go through the KVM tree because I have other optimizations for 4.8
> on top of these patches.

I'm applying patches 3 and 4 to the KVM tree.

Paolo