b2ca2e50b9
metadata changes:
- log pmc sample rate with pmcallocate
- log proc flags with thread / process logging
to identify user vs kernel threads
fixes:
- use log cpuid to translate event id to event name
Implement rudimentary summary command to track sample
counts by thread and process name within a pmc log.
% make -j4 buildkernel >& /dev/null &
% sudo pmcstat -S unhalted_core_cycles -S llc-misses -O foo sleep 15
% pmc summary foo
cpu_clk_unhalted.thread_p_any:
idle: 138108207162
clang-6.0: 105336158004
sh: 72340108510
make: 8642012963
kernel: 7754011631
longest_lat_cache.miss:
clang-6.0: 87502625
sh: 40901227
make: 5500165
kernel: 3300099
awk: 2000060
% pmc summary -f ~/foo
idx: 278 name: cpu_clk_unhalted.thread_p_any rate: 2000003
idle: 69054
clang-6.0: 52668
sh: 36170
make: 4321
kernel: 3877
hwpmc: proc(7445): 3319
awk: 1289
xargs: 357
rand_harvestq: 181
mtree: 102
intr: 53
zfskern: 31
usb: 7
pagedaemon: 4
ntpd: 3
syslogd: 1
acpi_thermal: 1
logger: 1
syncer: 1
snmptrapd: 1
sleep: 1
idx: 17 name: longest_lat_cache.miss rate: 100003
clang-6.0: 875
sh: 409
make: 55
kernel: 33
awk: 20
hwpmc: proc(7445): 14
xargs: 9
idle: 8
intr: 3
zfskern: 2
107 lines
3.4 KiB
C
107 lines
3.4 KiB
C
/*-
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* Copyright (c) 2014, Neville-Neil Consulting
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $FreeBSD$
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*
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* Author: George V. Neville-Neil
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*
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*/
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/*
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* Calculate the time overhead of starting, stopping, and recording
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* pmc counters.
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*
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* The only argument is a counter name, such as "instruction-retired"
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* which is CPU dependent and can be found with pmmcontrol(8) using
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* pmccontrol -L.
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*
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* The start, stop, read and write operations are timed using the
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* rdtsc() macro which reads the Time Stamp Counter on the CPU.
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*/
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#include <stdio.h>
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#include <err.h>
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#include <sysexits.h>
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#include <sys/types.h>
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#include <machine/cpufunc.h>
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#include <pmc.h>
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int
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main(int argc, char **argv)
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{
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pmc_id_t pmcid;
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pmc_value_t read_value;
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pmc_value_t read_clear_value;
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uint64_t tsc1, write_cyc, start_cyc, read_cyc, stop_cyc;
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char *counter_name;
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if (argc != 2)
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err(EX_USAGE, "counter-name required");
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counter_name = argv[1];
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if (pmc_init() != 0)
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err(EX_OSERR, "hwpmc(4) not loaded, kldload or update your kernel");
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if (pmc_allocate(counter_name, PMC_MODE_SC, 0, 0, &pmcid, 64*1024) < 0)
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err(EX_OSERR, "failed to allocate %s as a system counter in counting mode",
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counter_name);
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tsc1 = rdtsc();
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if (pmc_write(pmcid, 0) < 0)
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err(EX_OSERR, "failed to zero counter %s", counter_name);
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write_cyc = rdtsc() - tsc1;
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tsc1 = rdtsc();
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if (pmc_start(pmcid) < 0)
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err(EX_OSERR, "failed to start counter %s", counter_name);
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start_cyc = rdtsc() - tsc1;
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tsc1 = rdtsc();
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if (pmc_read(pmcid, &read_value) < 0)
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err(EX_OSERR, "failed to read counter %s", counter_name);
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read_cyc = rdtsc() - tsc1;
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tsc1 = rdtsc();
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if (pmc_stop(pmcid) < 0)
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err(EX_OSERR, "failed to stop counter %s", counter_name);
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stop_cyc = rdtsc() - tsc1;
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if (pmc_rw(pmcid, 0, &read_clear_value))
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err(EX_OSERR, "failed to read and zero %s", counter_name);
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if (pmc_release(pmcid) < 0)
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err(EX_OSERR, "failed to release %s as a system counter in counting mode",
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counter_name);
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printf("Counter %s, read value %ld, read/clear value %ld\n",
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counter_name, read_value, read_clear_value);
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printf("Cycles to start: %ld\tstop: %ld\tread: %ld\twrite: %ld\n",
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start_cyc, stop_cyc, read_cyc, stop_cyc);
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return(0);
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}
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