[v11,0/4] add support for self monitoring

  This series adds self monitoring support i.e allows to configure and
read performance measurement unit (PMU) counters in runtime without
using perf utility. This has certain advantages when application runs on
isolated cores running dedicated tasks.

Events can be read directly using rte_pmu_read() or using dedicated
tracepoint rte_eal_trace_pmu_read(). The latter will cause events to be
stored inside CTF file.

By design, all enabled events are grouped together and the same group
is attached to lcores that use self monitoring funtionality.

Events are enabled by names, which need to be read from standard
location under sysfs i.e

/sys/bus/event_source/devices/PMU/events

where PMU is a core pmu i.e one measuring cpu events. As of today
raw events are not supported.

v11:
- skip fast test in case init fails
v10:
- check permissions before using counters
- do not use internal symbols in exported functions
- address review comments
v9:
- fix 'maybe-uninitialized' warning reported by CI
v8:
- just rebase series
v7:
- use per-lcore event group instead of global table index by lcore-id
- don't add pmu_autotest to fast tests because due to lack of suported on
  every arch
v6:
- move codebase to the separate library
- address review comments
v5:
- address review comments
- fix sign extension while reading pmu on x86
- fix regex mentioned in doc
- various minor changes/improvements here and there
v4:
- fix freeing mem detected by debug_autotest
v3:
- fix shared build
v2:
- fix problems reported by test build infra

Tomasz Duszynski (4):
  lib: add generic support for reading PMU events
  pmu: support reading ARM PMU events in runtime
  pmu: support reading Intel x86_64 PMU events in runtime
  eal: add PMU support to tracing library

 MAINTAINERS                              |   5 +
 app/test/meson.build                     |   2 +
 app/test/test_pmu.c                      |  68 +++
 app/test/test_trace_perf.c               |  10 +
 doc/api/doxy-api-index.md                |   3 +-
 doc/api/doxy-api.conf.in                 |   1 +
 doc/guides/prog_guide/profile_app.rst    |  17 +
 doc/guides/prog_guide/trace_lib.rst      |  32 ++
 doc/guides/rel_notes/release_23_03.rst   |   7 +
 lib/eal/common/eal_common_trace.c        |  13 +-
 lib/eal/common/eal_common_trace_points.c |   5 +
 lib/eal/include/rte_eal_trace.h          |  13 +
 lib/eal/meson.build                      |   3 +
 lib/eal/version.map                      |   1 +
 lib/meson.build                          |   1 +
 lib/pmu/meson.build                      |  21 +
 lib/pmu/pmu_arm64.c                      |  94 ++++
 lib/pmu/pmu_private.h                    |  32 ++
 lib/pmu/rte_pmu.c                        | 521 +++++++++++++++++++++++
 lib/pmu/rte_pmu.h                        | 232 ++++++++++
 lib/pmu/rte_pmu_pmc_arm64.h              |  30 ++
 lib/pmu/rte_pmu_pmc_x86_64.h             |  24 ++
 lib/pmu/version.map                      |  16 +
 23 files changed, 1149 insertions(+), 2 deletions(-)
 create mode 100644 app/test/test_pmu.c
 create mode 100644 lib/pmu/meson.build
 create mode 100644 lib/pmu/pmu_arm64.c
 create mode 100644 lib/pmu/pmu_private.h
 create mode 100644 lib/pmu/rte_pmu.c
 create mode 100644 lib/pmu/rte_pmu.h
 create mode 100644 lib/pmu/rte_pmu_pmc_arm64.h
 create mode 100644 lib/pmu/rte_pmu_pmc_x86_64.h
 create mode 100644 lib/pmu/version.map

--
2.34.1
  

> -----Original Message-----
> From: Tomasz Duszynski <tduszynski@marvell.com>
> Sent: Friday, February 17, 2023 1:55 AM
> To: dev@dpdk.org
> Cc: roretzla@linux.microsoft.com; Ruifeng Wang <Ruifeng.Wang@arm.com>;
> bruce.richardson@intel.com; jerinj@marvell.com; mattias.ronnblom@ericsson.com;
> mb@smartsharesystems.com; thomas@monjalon.net; zhoumin@loongson.cn;
> david.marchand@redhat.com; Tomasz Duszynski <tduszynski@marvell.com>
> Subject: [PATCH v11 0/4] add support for self monitoring
> 
> This series adds self monitoring support i.e allows to configure and read performance
> measurement unit (PMU) counters in runtime without using perf utility. This has certain
> advantages when application runs on isolated cores running dedicated tasks.
> 
> Events can be read directly using rte_pmu_read() or using dedicated tracepoint
> rte_eal_trace_pmu_read(). The latter will cause events to be stored inside CTF file.
> 
> By design, all enabled events are grouped together and the same group is attached to
> lcores that use self monitoring funtionality.
> 
> Events are enabled by names, which need to be read from standard location under sysfs i.e
> 
> /sys/bus/event_source/devices/PMU/events
> 
> where PMU is a core pmu i.e one measuring cpu events. As of today raw events are not
> supported.
> 
> v11:
> - skip fast test in case init fails
> v10:
> - check permissions before using counters
> - do not use internal symbols in exported functions
> - address review comments
> v9:
> - fix 'maybe-uninitialized' warning reported by CI
> v8:
> - just rebase series
> v7:
> - use per-lcore event group instead of global table index by lcore-id
> - don't add pmu_autotest to fast tests because due to lack of suported on
>   every arch
> v6:
> - move codebase to the separate library
> - address review comments
> v5:
> - address review comments
> - fix sign extension while reading pmu on x86
> - fix regex mentioned in doc
> - various minor changes/improvements here and there
> v4:
> - fix freeing mem detected by debug_autotest
> v3:
> - fix shared build
> v2:
> - fix problems reported by test build infra
> 
> Tomasz Duszynski (4):
>   lib: add generic support for reading PMU events
>   pmu: support reading ARM PMU events in runtime
>   pmu: support reading Intel x86_64 PMU events in runtime
>   eal: add PMU support to tracing library
> 
>  MAINTAINERS                              |   5 +
>  app/test/meson.build                     |   2 +
>  app/test/test_pmu.c                      |  68 +++
>  app/test/test_trace_perf.c               |  10 +
>  doc/api/doxy-api-index.md                |   3 +-
>  doc/api/doxy-api.conf.in                 |   1 +
>  doc/guides/prog_guide/profile_app.rst    |  17 +
>  doc/guides/prog_guide/trace_lib.rst      |  32 ++
>  doc/guides/rel_notes/release_23_03.rst   |   7 +
>  lib/eal/common/eal_common_trace.c        |  13 +-
>  lib/eal/common/eal_common_trace_points.c |   5 +
>  lib/eal/include/rte_eal_trace.h          |  13 +
>  lib/eal/meson.build                      |   3 +
>  lib/eal/version.map                      |   1 +
>  lib/meson.build                          |   1 +
>  lib/pmu/meson.build                      |  21 +
>  lib/pmu/pmu_arm64.c                      |  94 ++++
>  lib/pmu/pmu_private.h                    |  32 ++
>  lib/pmu/rte_pmu.c                        | 521 +++++++++++++++++++++++
>  lib/pmu/rte_pmu.h                        | 232 ++++++++++
>  lib/pmu/rte_pmu_pmc_arm64.h              |  30 ++
>  lib/pmu/rte_pmu_pmc_x86_64.h             |  24 ++
>  lib/pmu/version.map                      |  16 +
>  23 files changed, 1149 insertions(+), 2 deletions(-)  create mode 100644
> app/test/test_pmu.c  create mode 100644 lib/pmu/meson.build  create mode 100644
> lib/pmu/pmu_arm64.c  create mode 100644 lib/pmu/pmu_private.h  create mode 100644
> lib/pmu/rte_pmu.c  create mode 100644 lib/pmu/rte_pmu.h  create mode 100644
> lib/pmu/rte_pmu_pmc_arm64.h  create mode 100644 lib/pmu/rte_pmu_pmc_x86_64.h  create mode
> 100644 lib/pmu/version.map
> 
> --
> 2.34.1

For the series,
Reviewed-by: Ruifeng Wang <ruifeng.wang@arm.com>
  

Hello Tomasz,

On Thu, Feb 16, 2023 at 6:55 PM Tomasz Duszynski <tduszynski@marvell.com> wrote:
>
> This series adds self monitoring support i.e allows to configure and
> read performance measurement unit (PMU) counters in runtime without
> using perf utility. This has certain advantages when application runs on
> isolated cores running dedicated tasks.
>
> Events can be read directly using rte_pmu_read() or using dedicated
> tracepoint rte_eal_trace_pmu_read(). The latter will cause events to be
> stored inside CTF file.
>
> By design, all enabled events are grouped together and the same group
> is attached to lcores that use self monitoring funtionality.
>
> Events are enabled by names, which need to be read from standard
> location under sysfs i.e
>
> /sys/bus/event_source/devices/PMU/events
>
> where PMU is a core pmu i.e one measuring cpu events. As of today
> raw events are not supported.
>
> Tomasz Duszynski (4):
>   lib: add generic support for reading PMU events
>   pmu: support reading ARM PMU events in runtime
>   pmu: support reading Intel x86_64 PMU events in runtime
>   eal: add PMU support to tracing library

There are still some pending comments on this series and it can't be
merged until they get sorted out.

I noted two points :
- Konstantin asked for better explanations in the implementation.
- He also pointed out at using this feature with non EAL lcores.

Could you work on this so we can consider this series for v23.07?

Thank you.