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

[Kyung Min Park]

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(-)

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2.7.4