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[0/5] rtla: Support idle state disabling via libcpupower in timerlat

Message ID 20240612145439.206990-1-tglozar@redhat.com (mailing list archive)
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Series rtla: Support idle state disabling via libcpupower in timerlat | expand

Message

Tomas Glozar June 12, 2024, 2:54 p.m. UTC 
From: Tomas Glozar <tglozar@redhat.com>

rtla-timerlat allows reducing latency on wake up from idle by setting
/dev/cpu_dma_latency during the timerlat measurement. This has an effect on
the idle states of all CPUs, including those which are not used by timerlat.

Add option --disable-idle-states that disables all idle states only on
the CPUs where timerlat measurements are running.

libcpupower is used to do the disabling of idle states via the corresponding
sysfs interface.

Tomas Glozar (5):
  rtla: Add dependency on libcpupower
  rtla/utils: Add idle state disabling via libcpupower
  rtla/timerlat: Add --disable-idle-states for top
  rtla/timerlat: Add --disable-idle-states for hist
  rtla: Documentation: Add --disable-idle-states

 .../tools/rtla/common_timerlat_options.rst    |   6 +
 tools/build/Makefile.feature                  |   1 +
 tools/build/feature/Makefile                  |   4 +
 tools/build/feature/test-libcpupower.c        |   8 ++
 tools/tracing/rtla/Makefile                   |   2 +
 tools/tracing/rtla/Makefile.config            |   9 ++
 tools/tracing/rtla/README.txt                 |   4 +
 tools/tracing/rtla/src/timerlat_hist.c        |  35 ++++-
 tools/tracing/rtla/src/timerlat_top.c         |  35 ++++-
 tools/tracing/rtla/src/utils.c                | 133 ++++++++++++++++++
 tools/tracing/rtla/src/utils.h                |   4 +
 11 files changed, 239 insertions(+), 2 deletions(-)
 create mode 100644 tools/build/feature/test-libcpupower.c