Hi Peter,
Here are updates that I have for the PT driver. The biggest change is
6/6, it gets rid of the reverse lookup table that the driver uses to
find ToPA (SG) entries by the page offset. With the high order page
allocations in the AUX buffer, the cost of runtime lookup should be
minimal, and we get to free up some memory that the table occupies.
Plus, we get to allocate 2G (and up) PT buffers should we be so
inclined.
Others are small reworks and cleanups striving to make the code easier
on the eyes.
Alexander Shishkin (6):
perf/x86/intel/pt: Clean up ToPA allocation path
perf/x86/intel/pt: Use helpers to obtain ToPA entry size
perf/x86/intel/pt: Use pointer arithmetics instead in ToPA entry
calculation
perf/x86/intel/pt: Split ToPA metadata and page layout
perf/x86/intel/pt: Free up space in a ToPA descriptor
perf/x86/intel/pt: Get rid of reverse lookup table for ToPA
arch/x86/events/intel/pt.c | 325 +++++++++++++++++++++++--------------
arch/x86/events/intel/pt.h | 12 +-
2 files changed, 210 insertions(+), 127 deletions(-)
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2.23.0.rc1
