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Message-ID: <YH24pC0HOmDYD7P9@kernel.org>
Date: Mon, 19 Apr 2021 14:06:44 -0300
From: Arnaldo Carvalho de Melo <acme@...nel.org>
To: alexander.antonov@...ux.intel.com
Cc: linux-kernel@...r.kernel.org, jolsa@...hat.com, ak@...ux.intel.com,
alexander.shishkin@...ux.intel.com, mark.rutland@....com,
namhyung@...nel.org, irogers@...gle.com, mingo@...hat.com,
peterz@...radead.org, alexey.v.bayduraev@...ux.intel.com
Subject: Re: [RESEND PATCH v5 0/4] perf stat: Introduce iostat mode to
provide I/O performance metrics
Em Mon, Apr 19, 2021 at 12:41:43PM +0300, alexander.antonov@...ux.intel.com escreveu:
> From: Alexander Antonov <alexander.antonov@...ux.intel.com>
>
> Resending V5 with added Acked-by: Namhyung Kim <namhyung@...nel.org> tag.
Thanks, applied.
- Arnaldo
> Thanks,
> Alexander
>
> The previous version can be found at:
> v4: https://lkml.kernel.org/r/20210203135830.38568-1-alexander.antonov@linux.intel.com/
> Changes in this revision are:
> v4 -> v5:
> - Addressed comments from Namhyung Kim:
> 1. Removed AGGR_PCIE_PORT aggregation mode
> 2. Added iostat_prepare() function
> 3. Moved implementation specific fprintf() calls to separate x86-related function
> 4. Fixed code-related issues
> - Moved __weak iostat's functions to separate util/iostat.c file
>
> The previous version can be found at:
> v3: https://lkml.kernel.org/r/20210126080619.30275-1-alexander.antonov@linux.intel.com/
> Changes in this revision are:
> v3 -> v4:
> - Addressed comment from Namhyung Kim:
> 1. Removed NULL-termination of root ports list
>
> The previous version can be found at:
> v2: https://lkml.kernel.org/r/20201223130320.3930-1-alexander.antonov@linux.intel.com
>
> Changes in this revision are:
> v2 -> v3:
> - Addressed comments from Namhyung Kim:
> 1. Removed perf_device pointer from evsel structure. Use priv field instead
> 2. Renamed 'iiostat' to 'iostat'
> 3. Renamed 'show' mode to 'list' mode
> 4. Renamed iiostat_delete_root_ports() to iiostat_release() and
> iostat_show_root_ports() to iostat_list()
>
> 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:
> - Addressed comment from Arnaldo Carvalho de Melo:
> 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
> root port:
> - Inbound Read: I/O devices below root port read from the host memory
> - Inbound Write: I/O devices below root port write to the host memory
> - Outbound Read: CPU reads from I/O devices below root port
> - Outbound Write: CPU writes to I/O devices below root port
>
> Each metric requiries only one uncore event which increments at every 4B
> transfer in corresponding direction. The formulas to compute metrics
> are generic:
> #EventCount * 4B / (1024 * 1024)
>
> Note: iostat introduces new perf data aggregation mode - per PCIe root port
> hence -e and -M options are not supported.
>
> Usage examples:
>
> 1. List all PCIe root ports (example for 2-S platform):
> $ perf iostat list
> 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 PCIe root ports:
> $ perf iostat -- 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 PCIe root ports:
> $ perf iostat 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 (4):
> perf stat: Basic support for iostat in perf
> perf stat: Helper functions for PCIe root ports list in iostat mode
> perf stat: Enable iostat mode for x86 platforms
> perf: Update .gitignore file
>
> tools/perf/.gitignore | 1 +
> tools/perf/Documentation/perf-iostat.txt | 88 +++++
> tools/perf/Makefile.perf | 5 +-
> tools/perf/arch/x86/util/Build | 1 +
> tools/perf/arch/x86/util/iostat.c | 470 +++++++++++++++++++++++
> tools/perf/builtin-stat.c | 21 +-
> tools/perf/command-list.txt | 1 +
> tools/perf/perf-iostat.sh | 12 +
> tools/perf/util/Build | 1 +
> tools/perf/util/iostat.c | 53 +++
> tools/perf/util/iostat.h | 47 +++
> tools/perf/util/stat-display.c | 40 +-
> tools/perf/util/stat-shadow.c | 5 +-
> tools/perf/util/stat.h | 1 +
> 14 files changed, 733 insertions(+), 13 deletions(-)
> create mode 100644 tools/perf/Documentation/perf-iostat.txt
> create mode 100644 tools/perf/arch/x86/util/iostat.c
> create mode 100644 tools/perf/perf-iostat.sh
> create mode 100644 tools/perf/util/iostat.c
> create mode 100644 tools/perf/util/iostat.h
>
>
> base-commit: 4c391ea001cb2e7bd9a691a886c0dcb030c1791c
> --
> 2.21.3
>
--
- Arnaldo
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