Messages in this thread | | | From | roman.sudarikov@linux ... | Subject | [PATCH 0/6] perf x86: Exposing IO stack to IO PMON mapping through sysfs | Date | Tue, 26 Nov 2019 19:36:24 +0300 |
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From: Roman Sudarikov <roman.sudarikov@linux.intel.com>
Intel® Xeon® Scalable processor family (code name Skylake-SP) makes significant changes in the integrated I/O (IIO) architecture. The new solution introduces IIO stacks which are responsible for managing traffic between the PCIe domain and the Mesh domain. Each IIO stack has its own PMON block and can handle either DMI port, x16 PCIe root port, MCP-Link or various built-in accelerators. IIO PMON blocks allow concurrent monitoring of I/O flows up to 4 x4 bifurcation within each IIO stack.
Software is supposed to program required perf counters within each IIO stack and gather performance data. The tricky thing here is that IIO PMON reports data per IIO stack but users have no idea what IIO stacks are - they only know devices which are connected to the platform.
Understanding IIO stack concept to find which IIO stack that particular IO device is connected to, or to identify an IIO PMON block to program for monitoring specific IIO stack assumes a lot of implicit knowledge about given Intel server platform architecture.
This patch set introduces: An infrastructure for exposing an Uncore unit to Uncore PMON mapping through sysfs-backend A new --iiostat mode in perf stat to provide I/O performance metrics per I/O device
Usage examples:
1. List all devices below IIO stacks ./perf stat --iiostat=show
Sample output w/o libpci:
S0-RootPort0-uncore_iio_0<00:00.0> S1-RootPort0-uncore_iio_0<81:00.0> S0-RootPort1-uncore_iio_1<18:00.0> S1-RootPort1-uncore_iio_1<86:00.0> S1-RootPort1-uncore_iio_1<88:00.0> S0-RootPort2-uncore_iio_2<3d:00.0> S1-RootPort2-uncore_iio_2<af:00.0> S1-RootPort3-uncore_iio_3<da:00.0>
Sample output with libpci:
S0-RootPort0-uncore_iio_0<00:00.0 Sky Lake-E DMI3 Registers> S1-RootPort0-uncore_iio_0<81:00.0 Ethernet Controller X710 for 10GbE SFP+> S0-RootPort1-uncore_iio_1<18:00.0 Omni-Path HFI Silicon 100 Series [discrete]> S1-RootPort1-uncore_iio_1<86:00.0 Ethernet Controller XL710 for 40GbE QSFP+> S1-RootPort1-uncore_iio_1<88:00.0 Ethernet Controller XL710 for 40GbE QSFP+> S0-RootPort2-uncore_iio_2<3d:00.0 Ethernet Connection X722 for 10GBASE-T> S1-RootPort2-uncore_iio_2<af:00.0 Omni-Path HFI Silicon 100 Series [discrete]> S1-RootPort3-uncore_iio_3<da:00.0 NVMe Datacenter SSD [Optane]>
2. Collect metrics for all I/O devices below IIO stack
./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, 215.381 s, 1.7 GB/s
Performance counter stats for 'system wide':
device Inbound Read(MB) Inbound Write(MB) Outbound Read(MB) Outbound Write(MB) 00:00.0 0 0 0 0 81:00.0 0 0 0 0 18:00.0 0 0 0 0 86:00.0 0 0 0 0 88:00.0 0 0 0 0 3b:00.0 3 0 0 0 3c:03.0 3 0 0 0 3d:00.0 3 0 0 0 af:00.0 0 0 0 0 da:00.0 358559 44 0 22
215.383783574 seconds time elapsed
3. Collect metrics for comma separted list of I/O devices
./perf stat --iiostat=da:00.0 -- dd if=/dev/zero of=/dev/nvme0n1 bs=1M oflag=direct 381555+0 records in 381554+0 records out 400088457216 bytes (400 GB, 373 GiB) copied, 374.044 s, 1.1 GB/s
Performance counter stats for 'system wide':
device Inbound Read(MB) Inbound Write(MB) Outbound Read(MB) Outbound Write(MB) da:00.0 382462 47 0 23
374.045775505 seconds time elapsed
Roman Sudarikov (6): perf x86: Infrastructure for exposing an Uncore unit to PMON mapping perf tools: Helper functions to enumerate and probe PCI devices perf stat: Helper functions for list of IIO devices perf stat: New --iiostat mode to provide I/O performance metrics perf tools: Add feature check for libpci perf stat: Add PCI device name to --iiostat output
arch/x86/events/intel/uncore.c | 61 +- arch/x86/events/intel/uncore.h | 13 +- arch/x86/events/intel/uncore_snbep.c | 144 ++++ tools/build/Makefile.feature | 2 + tools/build/feature/Makefile | 4 + tools/build/feature/test-all.c | 5 + tools/build/feature/test-libpci.c | 10 + tools/perf/Documentation/perf-stat.txt | 12 + tools/perf/Makefile.config | 10 + tools/perf/arch/x86/util/Build | 1 + tools/perf/arch/x86/util/iiostat.c | 718 ++++++++++++++++++ tools/perf/builtin-stat.c | 32 +- tools/perf/builtin-version.c | 1 + tools/perf/tests/make | 1 + tools/perf/util/Build | 1 + tools/perf/util/evsel.h | 1 + tools/perf/util/iiostat.h | 35 + tools/perf/util/pci.c | 99 +++ tools/perf/util/pci.h | 27 + .../scripting-engines/trace-event-python.c | 2 +- tools/perf/util/stat-display.c | 53 +- tools/perf/util/stat-shadow.c | 12 +- tools/perf/util/stat.c | 3 +- tools/perf/util/stat.h | 2 + 24 files changed, 1237 insertions(+), 12 deletions(-) create mode 100644 tools/build/feature/test-libpci.c create mode 100644 tools/perf/arch/x86/util/iiostat.c create mode 100644 tools/perf/util/iiostat.h create mode 100644 tools/perf/util/pci.c create mode 100644 tools/perf/util/pci.h
base-commit: 219d54332a09e8d8741c1e1982f5eae56099de85 -- 2.19.1
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