perf trace: Support setting cgroups as targets
One can set a cgroup as a default cgroup to be used by all events or
set cgroups with the 'perf stat' and 'perf record' behaviour, i.e.
'-G A' will be the cgroup for events defined so far in the command line.
Here in my main machine, with a kvm instance running a rhel6 guinea pig
I have:
# ls -la /sys/fs/cgroup/perf_event/ | grep drw
drwxr-xr-x. 14 root root 360 Mar 6 12:04 ..
drwxr-xr-x. 3 root root 0 Mar 6 15:05 machine.slice
#
So I can go ahead and use that cgroup hierarchy, say lets see what
syscalls are being emitted by threads in that 'machine.slice' hierarchy
that are taking more than 100ms:
# perf trace --duration 100 -G machine.slice
0.188 (249.850 ms): CPU 0/KVM/23744 ioctl(fd: 16<anon_inode:kvm-vcpu:0>, cmd: KVM_RUN) = 0
250.274 (249.743 ms): CPU 0/KVM/23744 ioctl(fd: 16<anon_inode:kvm-vcpu:0>, cmd: KVM_RUN) = 0
500.224 (249.755 ms): CPU 0/KVM/23744 ioctl(fd: 16<anon_inode:kvm-vcpu:0>, cmd: KVM_RUN) = 0
750.097 (249.934 ms): CPU 0/KVM/23744 ioctl(fd: 16<anon_inode:kvm-vcpu:0>, cmd: KVM_RUN) = 0
1000.244 (249.780 ms): CPU 0/KVM/23744 ioctl(fd: 16<anon_inode:kvm-vcpu:0>, cmd: KVM_RUN) = 0
1250.197 (249.796 ms): CPU 0/KVM/23744 ioctl(fd: 16<anon_inode:kvm-vcpu:0>, cmd: KVM_RUN) = 0
1500.124 (249.859 ms): CPU 0/KVM/23744 ioctl(fd: 16<anon_inode:kvm-vcpu:0>, cmd: KVM_RUN) = 0
1750.076 (172.900 ms): CPU 0/KVM/23744 ioctl(fd: 16<anon_inode:kvm-vcpu:0>, cmd: KVM_RUN) = 0
902.570 (1021.116 ms): qemu-system-x8/23667 ppoll(ufds: 0x558151e03180, nfds: 74, tsp: 0x7ffc00cd0900, sigsetsize: 8) = 1
1923.825 (305.133 ms): qemu-system-x8/23667 ppoll(ufds: 0x558151e03180, nfds: 74, tsp: 0x7ffc00cd0900, sigsetsize: 8) = 1
2000.172 (229.002 ms): CPU 0/KVM/23744 ioctl(fd: 16<anon_inode:kvm-vcpu:0>, cmd: KVM_RUN) = 0
^C #
If we look inside that cgroup hierarchy we get:
# ls -la /sys/fs/cgroup/perf_event/machine.slice/ | grep drw
drwxr-xr-x. 3 root root 0 Mar 6 15:05 .
drwxr-xr-x. 2 root root 0 Mar 6 16:16 machine-qemu\x2d2\x2drhel6.sandy.scope
#
There is just one, but lets say there were more and we would want to see
5 seconds worth of syscall summary for the threads in that cgroup:
# perf trace --summary -G machine.slice/machine-qemu\\x2d2\\x2drhel6.sandy.scope/ -a sleep 5
Summary of events:
qemu-system-x86 (23667), 143858 events, 24.2%
syscall calls total min avg max stddev
(msec) (msec) (msec) (msec) (%)
--------------- -------- --------- --------- --------- --------- ------
ppoll 28492 4348.631 0.000 0.153 11.616 1.05%
futex 19661 140.801 0.001 0.007 2.993 3.20%
read 18440 68.084 0.001 0.004 1.653 4.33%
ioctl 5387 24.768 0.002 0.005 0.134 1.62%
CPU 0/KVM (23744), 449455 events, 75.8%
syscall calls total min avg max stddev
(msec) (msec) (msec) (msec) (%)
--------------- -------- --------- --------- --------- --------- ------
ioctl 148364 3401.812 0.000 0.023 11.801 1.15%
futex 36131 404.127 0.001 0.011 7.377 2.63%
writev 29452 339.688 0.003 0.012 1.740 1.36%
write 11315 45.992 0.001 0.004 0.105 1.10%
#
See the documentation about how to set more than one cgroup for
different events in the same command line.
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: Hendrik Brueckner <brueckner@linux.vnet.ibm.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Ravi Bangoria <ravi.bangoria@linux.vnet.ibm.com>
Cc: Stephane Eranian <eranian@google.com>
Cc: Thomas Richter <tmricht@linux.vnet.ibm.com>
Cc: Wang Nan <wangnan0@huawei.com>
Link: https://lkml.kernel.org/n/tip-t126jh4occqvu0xdqlcjygex@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Arnaldo Carvalho de Melo
parent
3b5692864d
commit
9ea42ba441
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@ -63,6 +63,31 @@ filter out the startup phase of the program, which is often very different.
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--uid=::
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Record events in threads owned by uid. Name or number.
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-G::
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--cgroup::
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Record events in threads in a cgroup.
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Look for cgroups to set at the /sys/fs/cgroup/perf_event directory, then
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remove the /sys/fs/cgroup/perf_event/ part and try:
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perf trace -G A -e sched:*switch
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Will set all raw_syscalls:sys_{enter,exit}, pgfault, vfs_getname, etc
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_and_ sched:sched_switch to the 'A' cgroup, while:
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perf trace -e sched:*switch -G A
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will only set the sched:sched_switch event to the 'A' cgroup, all the
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other events (raw_syscalls:sys_{enter,exit}, etc are left "without"
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a cgroup (on the root cgroup, sys wide, etc).
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Multiple cgroups:
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perf trace -G A -e sched:*switch -G B
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the syscall ones go to the 'A' cgroup, the sched:sched_switch goes
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to the 'B' cgroup.
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--filter-pids=::
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Filter out events for these pids and for 'trace' itself (comma separated list).
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@ -19,6 +19,7 @@
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#include <traceevent/event-parse.h>
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#include <api/fs/tracing_path.h>
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#include "builtin.h"
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#include "util/cgroup.h"
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#include "util/color.h"
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#include "util/debug.h"
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#include "util/env.h"
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@ -83,6 +84,7 @@ struct trace {
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struct perf_evlist *evlist;
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struct machine *host;
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struct thread *current;
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struct cgroup *cgroup;
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u64 base_time;
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FILE *output;
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unsigned long nr_events;
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@ -2370,6 +2372,34 @@ static int trace__run(struct trace *trace, int argc, const char **argv)
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trace__sched_stat_runtime))
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goto out_error_sched_stat_runtime;
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/*
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* If a global cgroup was set, apply it to all the events without an
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* explicit cgroup. I.e.:
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*
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* trace -G A -e sched:*switch
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*
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* Will set all raw_syscalls:sys_{enter,exit}, pgfault, vfs_getname, etc
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* _and_ sched:sched_switch to the 'A' cgroup, while:
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*
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* trace -e sched:*switch -G A
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*
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* will only set the sched:sched_switch event to the 'A' cgroup, all the
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* other events (raw_syscalls:sys_{enter,exit}, etc are left "without"
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* a cgroup (on the root cgroup, sys wide, etc).
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*
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* Multiple cgroups:
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*
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* trace -G A -e sched:*switch -G B
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*
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* the syscall ones go to the 'A' cgroup, the sched:sched_switch goes
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* to the 'B' cgroup.
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*
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* evlist__set_default_cgroup() grabs a reference of the passed cgroup
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* only for the evsels still without a cgroup, i.e. evsel->cgroup == NULL.
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*/
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if (trace->cgroup)
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evlist__set_default_cgroup(trace->evlist, trace->cgroup);
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err = perf_evlist__create_maps(evlist, &trace->opts.target);
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if (err < 0) {
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fprintf(trace->output, "Problems parsing the target to trace, check your options!\n");
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@ -2540,6 +2570,7 @@ out_delete_evlist:
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trace__symbols__exit(trace);
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perf_evlist__delete(evlist);
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cgroup__put(trace->cgroup);
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trace->evlist = NULL;
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trace->live = false;
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return err;
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@ -2979,6 +3010,18 @@ out:
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return err;
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}
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static int trace__parse_cgroups(const struct option *opt, const char *str, int unset)
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{
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struct trace *trace = opt->value;
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if (!list_empty(&trace->evlist->entries))
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return parse_cgroups(opt, str, unset);
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trace->cgroup = evlist__findnew_cgroup(trace->evlist, str);
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return 0;
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}
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int cmd_trace(int argc, const char **argv)
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{
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const char *trace_usage[] = {
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@ -3069,6 +3112,8 @@ int cmd_trace(int argc, const char **argv)
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"print the PERF_RECORD_SAMPLE PERF_SAMPLE_ info, for debugging"),
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OPT_UINTEGER(0, "proc-map-timeout", &trace.opts.proc_map_timeout,
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"per thread proc mmap processing timeout in ms"),
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OPT_CALLBACK('G', "cgroup", &trace, "name", "monitor event in cgroup name only",
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trace__parse_cgroups),
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OPT_UINTEGER('D', "delay", &trace.opts.initial_delay,
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"ms to wait before starting measurement after program "
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"start"),
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@ -3095,6 +3140,11 @@ int cmd_trace(int argc, const char **argv)
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argc = parse_options_subcommand(argc, argv, trace_options, trace_subcommands,
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trace_usage, PARSE_OPT_STOP_AT_NON_OPTION);
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if ((nr_cgroups || trace.cgroup) && !trace.opts.target.system_wide) {
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usage_with_options_msg(trace_usage, trace_options,
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"cgroup monitoring only available in system-wide mode");
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}
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err = bpf__setup_stdout(trace.evlist);
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if (err) {
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bpf__strerror_setup_stdout(trace.evlist, err, bf, sizeof(bf));
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