linux-kernel - [PATCH v0 0/6] perf/x86/intel/pt: Misc updates

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Date:   Wed, 21 Aug 2019 15:47:21 +0300
From:   Alexander Shishkin <alexander.shishkin@...ux.intel.com>
To:     Peter Zijlstra <a.p.zijlstra@...llo.nl>
Cc:     Arnaldo Carvalho de Melo <acme@...hat.com>,
        Ingo Molnar <mingo@...hat.com>, linux-kernel@...r.kernel.org,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>
Subject: [PATCH v0 0/6] perf/x86/intel/pt: Misc updates

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(-)

-- 
2.23.0.rc1