linux-kernel - [PATCH 0/2] x86/delay: Introduce TPAUSE instruction

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Message-Id: <1582744258-42744-1-git-send-email-kyung.min.park@intel.com>
Date:   Wed, 26 Feb 2020 11:10:56 -0800
From:   Kyung Min Park <kyung.min.park@...el.com>
To:     x86@...nel.org, linux-kernel@...r.kernel.org
Cc:     tglx@...utronix.de, mingo@...hat.com, hpa@...or.com,
        gregkh@...uxfoundation.org, ak@...ux.intel.com,
        tony.luck@...el.com, ashok.raj@...el.com, ravi.v.shankar@...el.com,
        fenghua.yu@...el.com
Subject: [PATCH 0/2] x86/delay: Introduce TPAUSE instruction 

Intel processors that support the WAITPKG feature implement
the TPAUSE instruction that suspends execution in a lower power
state until the TSC (Time Stamp Counter) exceeds a certain value.

Update the udelay() function to use TPAUSE on systems where it
is available. Note that we hard code the deeper (C0.2) sleep
state because exit latency is small compared to the "microseconds"
that usleep() will delay.

Kyung Min Park (2):
  x86/asm: Define a few helpers in delay_waitx()
  x86/asm/delay: Introduce TPAUSE delay

 arch/x86/include/asm/mwait.h | 17 +++++++++
 arch/x86/lib/delay.c         | 82 ++++++++++++++++++++++++++++++++------------
 2 files changed, 78 insertions(+), 21 deletions(-)

-- 
2.7.4