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authorAndi Kleen <ak@linux.intel.com>2014-03-17 05:48:28 -0700
committerAndi Kleen <ak@linux.intel.com>2014-06-13 12:49:03 -0700
commita832bdd36203fcb37fa5ad25200ef3c1ae205efe (patch)
tree045064e8ee765c267caab8a76a0a014c39acb787 /debug
parent995a46bbfba9964e328e3947130919d8bd3cd62a (diff)
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Add a fast path for C rd/wrlock v2
One difference of the C versions to the assembler wr/rdlock
is that the C compiler saves some registers which are unnecessary
for the fast path in the prologue of the functions. Split the
uncontended fast path out into a separate function. Only when contention is
detected is the full featured function called. This makes
the fast path code (nearly) identical to the assembler version,
and gives uncontended performance within a few cycles.

v2: Rename some functions and add space.
Diffstat (limited to 'debug')
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