GCC 8.1 failed to build LLVM's libc++ when -Wshadow is set,
so lower down WARNS flag to 3.
This is similar to dtc(1) which uses libc++ and sets WARNS to 3.
Approved by: re (gjb)
Sponsored by: DARPA, AFRL
Fix the build of lib/libpmc and usr.sbin/pmc for gcc on amd64.
Reviewed by: mmacy
Sponsored by: Dell EMC Isilon
Differential Revision: https://reviews.freebsd.org/D15723
- add '-j' options to filter to enable converting native pmc
log format to json lines format to enable the use of scripts
and external tooling
% pmc filter -j pmc.log pmc.jsonl
- Record the tsc value in sampling interrupts as opposed to
recording nanotime when the sample is copied to a global log
in hardclock - potentially many milliseconds later.
- At initialize record the tsc_freq and the time of day to give
us an offset for translating the tsc values in callchain records
By logging all threads and processes 'pmc filter'
can now filter on process or thread name, relieving
the user of the burden of determining which tid or
pid was which when the sample was taken.
% pmc filter -T if_io_tqg -P nginx pmc.log pmc-iflib.log
% pmc filter -x -T idle pmc.log pmc-noidle.log
This will manage pmc functionality with a more
manageable structure of subcommands rather than the
gradually accreted spaghetti logic of overlapping flags
that exists in pmcstat.
This is intended to ultimately have all the same functionality
as pmcannotate+pmccontrol+pmcstat. Currently it just has
"stat" and "system-stat" - counters for the process itself and counters
for the system as a whole respectively (i.e. system-stat includes kernel
threads). Note that the rusage results (page faults/context switches/
user/sys) for stat-system will not account for the system as a whole -
only for the child process specified on the command line.
Implementing stat was suggested by mjg@ and the output is based on that
from Linux's "perf stat".
% pmc stat -- make -j32 buildkernel -DNO_MODULES -ss > /dev/null
9598393 page faults # 0.674 M/sec
387085 voluntary csw # 0.027 M/sec
106989 involuntary csw # 0.008 M/sec
2763965982317 cycles
2542953049760 instructions # 0.920 inst/cycle
511562750157 branches
12917006881 branch-misses # 2.525%
17944429878 cache-references # 0.007 refs/inst
2205119560 cache-misses # 12.289%
43.74 real # 2019.72% cpu
795.09 user # 1817.72% cpu
88.35 sys # 202.00% cpu
% make -j32 buildkernel -DNO_MODULES -ss > /dev/null &
% sudo pmc stat-system cat
^C 103 page faults # 0.811 M/sec
4 voluntary csw # 0.031 M/sec
0 involuntary csw # 0.000 M/sec
2843639070514 cycles
2606171217438 instructions # 0.916 inst/cycle
522450422783 branches
13092862839 branch-misses # 2.506%
18592101113 cache-references # 0.007 refs/inst
2562878667 cache-misses # 13.785%
44.85 real # 0.00% cpu
0.00 user # 0.00% cpu
0.00 sys # 0.00% cpu
