Messages in this thread | | | From | Alexander Antonov <> | Subject | [PATCH v2 0/6] perf stat: Introduce iiostat mode to provide I/O performance metrics | Date | Wed, 23 Dec 2020 16:03:14 +0300 |
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The previous version can be found at: v1: https://lkml.kernel.org/r/20201210090340.14358-1-alexander.antonov@linux.intel.com
Changes in this revision are: v1 -> v2: 1. Using 'perf iiostat' subcommand instead of 'perf stat --iiostat': - Added perf-iiostat.sh script to use short command - Updated manual pages to get help for 'perf iiostat' - Added 'perf-iiostat' to perf's gitignore file
Mode is intended to provide four I/O performance metrics in MB per each IIO stack: - Inbound Read: I/O devices below IIO stack read from the host memory - Inbound Write: I/O devices below IIO stack write to the host memory - Outbound Read: CPU reads from I/O devices below IIO stack - Outbound Write: CPU writes to I/O devices below IIO stack
Each metric requiries only one IIO event which increments at every 4B transfer in corresponding direction. The formulas to compute metrics are generic: #EventCount * 4B / (1024 * 1024)
Note: iiostat introduces new perf data aggregation mode - per I/O stack hence -e and -M options are not supported.
Usage examples:
1. List all IIO stacks (example for 2-S platform): $ perf iiostat show S0-uncore_iio_0<0000:00> S1-uncore_iio_0<0000:80> S0-uncore_iio_1<0000:17> S1-uncore_iio_1<0000:85> S0-uncore_iio_2<0000:3a> S1-uncore_iio_2<0000:ae> S0-uncore_iio_3<0000:5d> S1-uncore_iio_3<0000:d7>
2. Collect metrics for all I/O stacks: $ perf iiostat -- dd if=/dev/zero of=/dev/nvme0n1 bs=1M oflag=direct 357708+0 records in 357707+0 records out 375083606016 bytes (375 GB, 349 GiB) copied, 215.974 s, 1.7 GB/s
Performance counter stats for 'system wide':
port Inbound Read(MB) Inbound Write(MB) Outbound Read(MB) Outbound Write(MB) 0000:00 1 0 2 3 0000:80 0 0 0 0 0000:17 352552 43 0 21 0000:85 0 0 0 0 0000:3a 3 0 0 0 0000:ae 0 0 0 0 0000:5d 0 0 0 0 0000:d7 0 0 0 0
3. Collect metrics for comma separated list of I/O stacks: $ perf iiostat 0000:17,0:3a -- dd if=/dev/zero of=/dev/nvme0n1 bs=1M oflag=direct 357708+0 records in 357707+0 records out 375083606016 bytes (375 GB, 349 GiB) copied, 197.08 s, 1.9 GB/s
Performance counter stats for 'system wide':
port Inbound Read(MB) Inbound Write(MB) Outbound Read(MB) Outbound Write(MB) 0000:17 358559 44 0 22 0000:3a 3 2 0 0
197.081983474 seconds time elapsed
Alexander Antonov (6): perf stat: Add AGGR_IIO_STACK mode perf evsel: Introduce an observed performance device perf stat: Basic support for iiostat in perf perf stat: Helper functions for IIO stacks list in iiostat mode perf stat: Enable iiostat mode for x86 platforms perf: Update .gitignore file
tools/perf/.gitignore | 1 + tools/perf/Documentation/perf-iiostat.txt | 89 ++++ tools/perf/Makefile.perf | 5 +- tools/perf/arch/x86/util/Build | 1 + tools/perf/arch/x86/util/iiostat.c | 462 ++++++++++++++++++ tools/perf/builtin-stat.c | 40 +- tools/perf/command-list.txt | 1 + tools/perf/perf-iiostat.sh | 12 + tools/perf/util/evsel.h | 1 + tools/perf/util/iiostat.h | 33 ++ .../scripting-engines/trace-event-python.c | 2 +- tools/perf/util/stat-display.c | 51 +- tools/perf/util/stat-shadow.c | 11 +- tools/perf/util/stat.c | 3 +- tools/perf/util/stat.h | 2 + 15 files changed, 704 insertions(+), 10 deletions(-) create mode 100644 tools/perf/Documentation/perf-iiostat.txt create mode 100644 tools/perf/arch/x86/util/iiostat.c create mode 100644 tools/perf/perf-iiostat.sh create mode 100644 tools/perf/util/iiostat.h
base-commit: 644bf4b0f7acde641d3db200b4db66977e96c3bd -- 2.19.1
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