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Message-Id: <20201210090340.14358-1-alexander.antonov@linux.intel.com>
Date: Thu, 10 Dec 2020 12:03:35 +0300
From: Alexander Antonov <alexander.antonov@...ux.intel.com>
To: acme@...nel.org
Cc: linux-kernel@...r.kernel.org, jolsa@...hat.com,
alexander.shishkin@...ux.intel.com, mark.rutland@....com,
namhyung@...nel.org, mingo@...hat.com, peterz@...radead.org,
ak@...ux.intel.com, alexander.antonov@...ux.intel.com
Subject: [PATCH 0/5] perf stat: Introduce --iiostat mode to provide I/O performance metrics
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 stat --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 stat --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 stat --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 (5):
perf stat: Add AGGR_IIO_STACK mode
perf evsel: Introduce an observed performance device
perf stat: Basic support for iiostat in perf stat
perf stat: Helper functions for IIO stacks list in iiostat mode
perf stat: Enable --iiostat mode for x86 platforms
tools/perf/Documentation/perf-stat.txt | 31 ++
tools/perf/arch/x86/util/Build | 1 +
tools/perf/arch/x86/util/iiostat.c | 460 ++++++++++++++++++
tools/perf/builtin-stat.c | 38 +-
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 +
11 files changed, 625 insertions(+), 8 deletions(-)
create mode 100644 tools/perf/arch/x86/util/iiostat.c
create mode 100644 tools/perf/util/iiostat.h
base-commit: 644bf4b0f7acde641d3db200b4db66977e96c3bd
--
2.19.1
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