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perf stat: Enable iostat mode for x86 platforms
This functionality is based on recently introduced sysfs attributes for
Intel® Xeon® Scalable processor family (code name Skylake-SP):
Commit bb42b3d397 ("perf/x86/intel/uncore: Expose an Uncore unit to IIO PMON mapping")
Mode is intended to provide four I/O performance metrics in MB per each
PCIe 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)
Acked-by: Namhyung Kim <namhyung@kernel.org>
Signed-off-by: Alexander Antonov <alexander.antonov@linux.intel.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Alexey V Bayduraev <alexey.v.bayduraev@linux.intel.com>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: Arnaldo Carvalho de Melo <acme@kernel.org>
Cc: Ian Rogers <irogers@google.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: https://lore.kernel.org/r/20210419094147.15909-4-alexander.antonov@linux.intel.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Alexander Antonov
Arnaldo Carvalho de Melo
parent
19776d3ced
commit
f9ed693e8b
88
tools/perf/Documentation/perf-iostat.txt
Normal file
88
tools/perf/Documentation/perf-iostat.txt
Normal file
@ -0,0 +1,88 @@
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perf-iostat(1)
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===============
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NAME
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----
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perf-iostat - Show I/O performance metrics
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SYNOPSIS
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--------
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[verse]
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'perf iostat' list
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'perf iostat' <ports> -- <command> [<options>]
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DESCRIPTION
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-----------
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Mode is intended to provide four I/O performance metrics per each PCIe root port:
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- Inbound Read - I/O devices below root port read from the host memory, in MB
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- Inbound Write - I/O devices below root port write to the host memory, in MB
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- Outbound Read - CPU reads from I/O devices below root port, in MB
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- Outbound Write - CPU writes to I/O devices below root port, in MB
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OPTIONS
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-------
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<command>...::
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Any command you can specify in a shell.
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list::
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List all PCIe root ports.
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<ports>::
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Select the root ports for monitoring. Comma-separated list is supported.
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EXAMPLES
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--------
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1. List all PCIe root ports (example for 2-S platform):
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$ perf iostat list
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S0-uncore_iio_0<0000:00>
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S1-uncore_iio_0<0000:80>
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S0-uncore_iio_1<0000:17>
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S1-uncore_iio_1<0000:85>
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S0-uncore_iio_2<0000:3a>
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S1-uncore_iio_2<0000:ae>
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S0-uncore_iio_3<0000:5d>
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S1-uncore_iio_3<0000:d7>
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2. Collect metrics for all PCIe root ports:
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$ perf iostat -- dd if=/dev/zero of=/dev/nvme0n1 bs=1M oflag=direct
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357708+0 records in
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357707+0 records out
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375083606016 bytes (375 GB, 349 GiB) copied, 215.974 s, 1.7 GB/s
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Performance counter stats for 'system wide':
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port Inbound Read(MB) Inbound Write(MB) Outbound Read(MB) Outbound Write(MB)
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0000:00 1 0 2 3
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0000:80 0 0 0 0
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0000:17 352552 43 0 21
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0000:85 0 0 0 0
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0000:3a 3 0 0 0
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0000:ae 0 0 0 0
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0000:5d 0 0 0 0
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0000:d7 0 0 0 0
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3. Collect metrics for comma-separated list of PCIe root ports:
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$ perf iostat 0000:17,0:3a -- dd if=/dev/zero of=/dev/nvme0n1 bs=1M oflag=direct
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357708+0 records in
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357707+0 records out
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375083606016 bytes (375 GB, 349 GiB) copied, 197.08 s, 1.9 GB/s
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Performance counter stats for 'system wide':
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port Inbound Read(MB) Inbound Write(MB) Outbound Read(MB) Outbound Write(MB)
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0000:17 358559 44 0 22
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0000:3a 3 2 0 0
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197.081983474 seconds time elapsed
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SEE ALSO
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--------
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linkperf:perf-stat[1]
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@ -283,6 +283,7 @@ SCRIPT_SH =
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SCRIPT_SH += perf-archive.sh
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SCRIPT_SH += perf-with-kcore.sh
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SCRIPT_SH += perf-iostat.sh
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grep-libs = $(filter -l%,$(1))
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strip-libs = $(filter-out -l%,$(1))
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@ -948,6 +949,8 @@ endif
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$(INSTALL) $(OUTPUT)perf-archive -t '$(DESTDIR_SQ)$(perfexec_instdir_SQ)'
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$(call QUIET_INSTALL, perf-with-kcore) \
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$(INSTALL) $(OUTPUT)perf-with-kcore -t '$(DESTDIR_SQ)$(perfexec_instdir_SQ)'
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$(call QUIET_INSTALL, perf-iostat) \
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$(INSTALL) $(OUTPUT)perf-iostat -t '$(DESTDIR_SQ)$(perfexec_instdir_SQ)'
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ifndef NO_LIBAUDIT
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$(call QUIET_INSTALL, strace/groups) \
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$(INSTALL) -d -m 755 '$(DESTDIR_SQ)$(STRACE_GROUPS_INSTDIR_SQ)'; \
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@ -1042,7 +1045,7 @@ bpf-skel-clean:
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$(call QUIET_CLEAN, bpf-skel) $(RM) -r $(SKEL_TMP_OUT) $(SKELETONS)
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clean:: $(LIBTRACEEVENT)-clean $(LIBAPI)-clean $(LIBBPF)-clean $(LIBSUBCMD)-clean $(LIBPERF)-clean fixdep-clean python-clean bpf-skel-clean
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$(call QUIET_CLEAN, core-objs) $(RM) $(LIBPERF_A) $(OUTPUT)perf-archive $(OUTPUT)perf-with-kcore $(LANG_BINDINGS)
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$(call QUIET_CLEAN, core-objs) $(RM) $(LIBPERF_A) $(OUTPUT)perf-archive $(OUTPUT)perf-with-kcore $(OUTPUT)perf-iostat $(LANG_BINDINGS)
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$(Q)find $(if $(OUTPUT),$(OUTPUT),.) -name '*.o' -delete -o -name '\.*.cmd' -delete -o -name '\.*.d' -delete
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$(Q)$(RM) $(OUTPUT).config-detected
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$(call QUIET_CLEAN, core-progs) $(RM) $(ALL_PROGRAMS) perf perf-read-vdso32 perf-read-vdsox32 $(OUTPUT)pmu-events/jevents $(OUTPUT)$(LIBJVMTI).so
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@ -9,6 +9,7 @@ perf-y += event.o
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perf-y += evlist.o
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perf-y += mem-events.o
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perf-y += evsel.o
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perf-y += iostat.o
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perf-$(CONFIG_DWARF) += dwarf-regs.o
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perf-$(CONFIG_BPF_PROLOGUE) += dwarf-regs.o
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@ -27,6 +27,36 @@
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#include "util/counts.h"
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#include "path.h"
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#ifndef MAX_PATH
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#define MAX_PATH 1024
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#endif
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#define UNCORE_IIO_PMU_PATH "devices/uncore_iio_%d"
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#define SYSFS_UNCORE_PMU_PATH "%s/"UNCORE_IIO_PMU_PATH
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#define PLATFORM_MAPPING_PATH UNCORE_IIO_PMU_PATH"/die%d"
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/*
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* Each metric requiries one IIO event which increments at every 4B transfer
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* in corresponding direction. The formulas to compute metrics are generic:
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* #EventCount * 4B / (1024 * 1024)
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*/
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static const char * const iostat_metrics[] = {
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"Inbound Read(MB)",
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"Inbound Write(MB)",
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"Outbound Read(MB)",
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"Outbound Write(MB)",
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};
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static inline int iostat_metrics_count(void)
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{
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return sizeof(iostat_metrics) / sizeof(char *);
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}
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static const char *iostat_metric_by_idx(int idx)
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{
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return *(iostat_metrics + idx % iostat_metrics_count());
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}
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struct iio_root_port {
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u32 domain;
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u8 bus;
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@ -40,6 +70,8 @@ struct iio_root_ports_list {
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int nr_entries;
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};
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static struct iio_root_ports_list *root_ports;
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static void iio_root_port_show(FILE *output,
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const struct iio_root_port * const rp)
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{
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@ -108,3 +140,331 @@ static int iio_root_ports_list_insert(struct iio_root_ports_list *list,
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}
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return 0;
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}
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static int iio_mapping(u8 pmu_idx, struct iio_root_ports_list * const list)
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{
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char *buf;
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char path[MAX_PATH];
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u32 domain;
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u8 bus;
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struct iio_root_port *rp;
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size_t size;
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int ret;
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for (int die = 0; die < cpu__max_node(); die++) {
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scnprintf(path, MAX_PATH, PLATFORM_MAPPING_PATH, pmu_idx, die);
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if (sysfs__read_str(path, &buf, &size) < 0) {
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if (pmu_idx)
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goto out;
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pr_err("Mode iostat is not supported\n");
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return -1;
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}
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ret = sscanf(buf, "%04x:%02hhx", &domain, &bus);
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free(buf);
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if (ret != 2) {
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pr_err("Invalid mapping data: iio_%d; die%d\n",
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pmu_idx, die);
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return -1;
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}
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rp = iio_root_port_new(domain, bus, die, pmu_idx);
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if (!rp || iio_root_ports_list_insert(list, rp)) {
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free(rp);
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return -ENOMEM;
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}
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}
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out:
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return 0;
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}
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static u8 iio_pmu_count(void)
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{
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u8 pmu_idx = 0;
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char path[MAX_PATH];
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const char *sysfs = sysfs__mountpoint();
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if (sysfs) {
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for (;; pmu_idx++) {
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snprintf(path, sizeof(path), SYSFS_UNCORE_PMU_PATH,
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sysfs, pmu_idx);
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if (access(path, F_OK) != 0)
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break;
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}
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}
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return pmu_idx;
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}
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static int iio_root_ports_scan(struct iio_root_ports_list **list)
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{
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int ret = -ENOMEM;
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struct iio_root_ports_list *tmp_list;
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u8 pmu_count = iio_pmu_count();
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if (!pmu_count) {
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pr_err("Unsupported uncore pmu configuration\n");
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return -1;
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}
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tmp_list = calloc(1, sizeof(*tmp_list));
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if (!tmp_list)
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goto err;
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for (u8 pmu_idx = 0; pmu_idx < pmu_count; pmu_idx++) {
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ret = iio_mapping(pmu_idx, tmp_list);
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if (ret)
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break;
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}
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err:
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if (!ret)
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*list = tmp_list;
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else
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iio_root_ports_list_free(tmp_list);
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return ret;
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}
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static int iio_root_port_parse_str(u32 *domain, u8 *bus, char *str)
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{
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int ret;
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regex_t regex;
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/*
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* Expected format domain:bus:
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* Valid domain range [0:ffff]
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* Valid bus range [0:ff]
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* Example: 0000:af, 0:3d, 01:7
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*/
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regcomp(®ex, "^([a-f0-9A-F]{1,}):([a-f0-9A-F]{1,2})", REG_EXTENDED);
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ret = regexec(®ex, str, 0, NULL, 0);
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if (ret || sscanf(str, "%08x:%02hhx", domain, bus) != 2)
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pr_warning("Unrecognized root port format: %s\n"
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"Please use the following format:\n"
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"\t [domain]:[bus]\n"
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"\t for example: 0000:3d\n", str);
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regfree(®ex);
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return ret;
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}
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static int iio_root_ports_list_filter(struct iio_root_ports_list **list,
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const char *filter)
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{
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char *tok, *tmp, *filter_copy = NULL;
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struct iio_root_port *rp;
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u32 domain;
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u8 bus;
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int ret = -ENOMEM;
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struct iio_root_ports_list *tmp_list = calloc(1, sizeof(*tmp_list));
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if (!tmp_list)
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goto err;
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filter_copy = strdup(filter);
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if (!filter_copy)
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goto err;
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for (tok = strtok_r(filter_copy, ",", &tmp); tok;
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tok = strtok_r(NULL, ",", &tmp)) {
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if (!iio_root_port_parse_str(&domain, &bus, tok)) {
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rp = iio_root_port_find_by_notation(*list, domain, bus);
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if (rp) {
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(*list)->rps[rp->idx] = NULL;
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ret = iio_root_ports_list_insert(tmp_list, rp);
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if (ret) {
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free(rp);
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goto err;
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}
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} else if (!iio_root_port_find_by_notation(tmp_list,
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domain, bus))
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pr_warning("Root port %04x:%02x were not found\n",
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domain, bus);
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}
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}
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if (tmp_list->nr_entries == 0) {
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pr_err("Requested root ports were not found\n");
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ret = -EINVAL;
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}
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err:
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iio_root_ports_list_free(*list);
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if (ret)
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iio_root_ports_list_free(tmp_list);
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else
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*list = tmp_list;
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free(filter_copy);
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return ret;
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}
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static int iostat_event_group(struct evlist *evl,
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struct iio_root_ports_list *list)
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{
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int ret;
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int idx;
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const char *iostat_cmd_template =
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"{uncore_iio_%x/event=0x83,umask=0x04,ch_mask=0xF,fc_mask=0x07/,\
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uncore_iio_%x/event=0x83,umask=0x01,ch_mask=0xF,fc_mask=0x07/,\
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uncore_iio_%x/event=0xc0,umask=0x04,ch_mask=0xF,fc_mask=0x07/,\
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uncore_iio_%x/event=0xc0,umask=0x01,ch_mask=0xF,fc_mask=0x07/}";
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const int len_template = strlen(iostat_cmd_template) + 1;
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struct evsel *evsel = NULL;
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int metrics_count = iostat_metrics_count();
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char *iostat_cmd = calloc(len_template, 1);
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if (!iostat_cmd)
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return -ENOMEM;
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for (idx = 0; idx < list->nr_entries; idx++) {
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sprintf(iostat_cmd, iostat_cmd_template,
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list->rps[idx]->pmu_idx, list->rps[idx]->pmu_idx,
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list->rps[idx]->pmu_idx, list->rps[idx]->pmu_idx);
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ret = parse_events(evl, iostat_cmd, NULL);
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if (ret)
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goto err;
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}
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evlist__for_each_entry(evl, evsel) {
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evsel->priv = list->rps[evsel->idx / metrics_count];
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}
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list->nr_entries = 0;
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err:
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iio_root_ports_list_free(list);
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free(iostat_cmd);
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return ret;
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}
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int iostat_prepare(struct evlist *evlist, struct perf_stat_config *config)
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{
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if (evlist->core.nr_entries > 0) {
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pr_warning("The -e and -M options are not supported."
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"All chosen events/metrics will be dropped\n");
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evlist__delete(evlist);
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evlist = evlist__new();
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if (!evlist)
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return -ENOMEM;
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}
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config->metric_only = true;
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config->aggr_mode = AGGR_GLOBAL;
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return iostat_event_group(evlist, root_ports);
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}
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int iostat_parse(const struct option *opt, const char *str,
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int unset __maybe_unused)
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{
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int ret;
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struct perf_stat_config *config = (struct perf_stat_config *)opt->data;
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ret = iio_root_ports_scan(&root_ports);
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if (!ret) {
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config->iostat_run = true;
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if (!str)
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iostat_mode = IOSTAT_RUN;
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else if (!strcmp(str, "list"))
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iostat_mode = IOSTAT_LIST;
|
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else {
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iostat_mode = IOSTAT_RUN;
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ret = iio_root_ports_list_filter(&root_ports, str);
|
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}
|
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}
|
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return ret;
|
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}
|
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|
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void iostat_list(struct evlist *evlist, struct perf_stat_config *config)
|
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{
|
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struct evsel *evsel;
|
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struct iio_root_port *rp = NULL;
|
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|
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evlist__for_each_entry(evlist, evsel) {
|
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if (rp != evsel->priv) {
|
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rp = evsel->priv;
|
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iio_root_port_show(config->output, rp);
|
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}
|
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}
|
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}
|
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|
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void iostat_release(struct evlist *evlist)
|
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{
|
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struct evsel *evsel;
|
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struct iio_root_port *rp = NULL;
|
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|
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evlist__for_each_entry(evlist, evsel) {
|
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if (rp != evsel->priv) {
|
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rp = evsel->priv;
|
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free(evsel->priv);
|
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}
|
||||
}
|
||||
}
|
||||
|
||||
void iostat_prefix(struct evlist *evlist,
|
||||
struct perf_stat_config *config,
|
||||
char *prefix, struct timespec *ts)
|
||||
{
|
||||
struct iio_root_port *rp = evlist->selected->priv;
|
||||
|
||||
if (rp) {
|
||||
if (ts)
|
||||
sprintf(prefix, "%6lu.%09lu%s%04x:%02x%s",
|
||||
ts->tv_sec, ts->tv_nsec,
|
||||
config->csv_sep, rp->domain, rp->bus,
|
||||
config->csv_sep);
|
||||
else
|
||||
sprintf(prefix, "%04x:%02x%s", rp->domain, rp->bus,
|
||||
config->csv_sep);
|
||||
}
|
||||
}
|
||||
|
||||
void iostat_print_header_prefix(struct perf_stat_config *config)
|
||||
{
|
||||
if (config->csv_output)
|
||||
fputs("port,", config->output);
|
||||
else if (config->interval)
|
||||
fprintf(config->output, "# time port ");
|
||||
else
|
||||
fprintf(config->output, " port ");
|
||||
}
|
||||
|
||||
void iostat_print_metric(struct perf_stat_config *config, struct evsel *evsel,
|
||||
struct perf_stat_output_ctx *out)
|
||||
{
|
||||
double iostat_value = 0;
|
||||
u64 prev_count_val = 0;
|
||||
const char *iostat_metric = iostat_metric_by_idx(evsel->idx);
|
||||
u8 die = ((struct iio_root_port *)evsel->priv)->die;
|
||||
struct perf_counts_values *count = perf_counts(evsel->counts, die, 0);
|
||||
|
||||
if (count->run && count->ena) {
|
||||
if (evsel->prev_raw_counts && !out->force_header) {
|
||||
struct perf_counts_values *prev_count =
|
||||
perf_counts(evsel->prev_raw_counts, die, 0);
|
||||
|
||||
prev_count_val = prev_count->val;
|
||||
prev_count->val = count->val;
|
||||
}
|
||||
iostat_value = (count->val - prev_count_val) /
|
||||
((double) count->run / count->ena);
|
||||
}
|
||||
out->print_metric(config, out->ctx, NULL, "%8.0f", iostat_metric,
|
||||
iostat_value / (256 * 1024));
|
||||
}
|
||||
|
||||
void iostat_print_counters(struct evlist *evlist,
|
||||
struct perf_stat_config *config, struct timespec *ts,
|
||||
char *prefix, iostat_print_counter_t print_cnt_cb)
|
||||
{
|
||||
void *perf_device = NULL;
|
||||
struct evsel *counter = evlist__first(evlist);
|
||||
|
||||
evlist__set_selected(evlist, counter);
|
||||
iostat_prefix(evlist, config, prefix, ts);
|
||||
fprintf(config->output, "%s", prefix);
|
||||
evlist__for_each_entry(evlist, counter) {
|
||||
perf_device = evlist->selected->priv;
|
||||
if (perf_device && perf_device != counter->priv) {
|
||||
evlist__set_selected(evlist, counter);
|
||||
iostat_prefix(evlist, config, prefix, ts);
|
||||
fprintf(config->output, "\n%s", prefix);
|
||||
}
|
||||
print_cnt_cb(config, counter, prefix);
|
||||
}
|
||||
fputc('\n', config->output);
|
||||
}
|
||||
|
||||
@ -14,6 +14,7 @@ perf-config mainporcelain common
|
||||
perf-evlist mainporcelain common
|
||||
perf-ftrace mainporcelain common
|
||||
perf-inject mainporcelain common
|
||||
perf-iostat mainporcelain common
|
||||
perf-kallsyms mainporcelain common
|
||||
perf-kmem mainporcelain common
|
||||
perf-kvm mainporcelain common
|
||||
|
||||
12
tools/perf/perf-iostat.sh
Normal file
12
tools/perf/perf-iostat.sh
Normal file
@ -0,0 +1,12 @@
|
||||
#!/bin/bash
|
||||
# SPDX-License-Identifier: GPL-2.0
|
||||
# perf iostat
|
||||
# Alexander Antonov <alexander.antonov@linux.intel.com>
|
||||
|
||||
if [[ "$1" == "list" ]] || [[ "$1" =~ ([a-f0-9A-F]{1,}):([a-f0-9A-F]{1,2})(,)? ]]; then
|
||||
DELIMITER="="
|
||||
else
|
||||
DELIMITER=" "
|
||||
fi
|
||||
|
||||
perf stat --iostat$DELIMITER$*
|
||||
Loading…
Reference in New Issue
Block a user