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

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Date:	Mon, 30 May 2016 14:30:12 +0200
From:	Paolo Bonzini <pbonzini@...hat.com>
To:	linux-kernel@...r.kernel.org, x86@...nel.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.com>,
	Thomas Gleixner <tglx@...utronix.de>
Subject: [PATCH 0/2] x86/entry: speed up context-tracking system calls by 150 clock cycles

Two simple optimizations to the system call entry/exit code.
The first 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 is just adding an
inline annotation.

Thanks,

Paolo

Paolo Bonzini (2):
  x86/entry: Avoid interrupt flag save and restore
  x86/entry: Inline enter_from_user_mode

 arch/x86/entry/common.c          |  6 +++---
 include/linux/context_tracking.h | 15 +++++++++++++++
 2 files changed, 18 insertions(+), 3 deletions(-)

-- 
2.4.3