~ [ source navigation ] ~ [ diff markup ] ~ [ identifier search ] ~

TOMOYO Linux Cross Reference
Linux/tools/perf/tests/perf-time-to-tsc.c

Version: ~ [ linux-6.2-rc3 ] ~ [ linux-6.1.5 ] ~ [ linux-6.0.19 ] ~ [ linux-5.19.17 ] ~ [ linux-5.18.19 ] ~ [ linux-5.17.15 ] ~ [ linux-5.16.20 ] ~ [ linux-5.15.87 ] ~ [ linux-5.14.21 ] ~ [ linux-5.13.19 ] ~ [ linux-5.12.19 ] ~ [ linux-5.11.22 ] ~ [ linux-5.10.162 ] ~ [ linux-5.9.16 ] ~ [ linux-5.8.18 ] ~ [ linux-5.7.19 ] ~ [ linux-5.6.19 ] ~ [ linux-5.5.19 ] ~ [ linux-5.4.228 ] ~ [ linux-5.3.18 ] ~ [ linux-5.2.21 ] ~ [ linux-5.1.21 ] ~ [ linux-5.0.21 ] ~ [ linux-4.20.17 ] ~ [ linux-4.19.269 ] ~ [ linux-4.18.20 ] ~ [ linux-4.17.19 ] ~ [ linux-4.16.18 ] ~ [ linux-4.15.18 ] ~ [ linux-4.14.302 ] ~ [ linux-4.13.16 ] ~ [ linux-4.12.14 ] ~ [ linux-4.11.12 ] ~ [ linux-4.10.17 ] ~ [ linux-4.9.337 ] ~ [ linux-4.8.17 ] ~ [ linux-4.7.10 ] ~ [ linux-4.6.7 ] ~ [ linux-4.5.7 ] ~ [ linux-4.4.302 ] ~ [ linux-4.3.6 ] ~ [ linux-4.2.8 ] ~ [ linux-4.1.52 ] ~ [ linux-4.0.9 ] ~ [ linux-3.10.108 ] ~ [ linux-2.6.32.71 ] ~ [ linux-2.6.0 ] ~ [ linux-2.4.37.11 ] ~ [ unix-v6-master ] ~ [ ccs-tools-1.8.9 ] ~ [ policy-sample ] ~
Architecture: ~ [ i386 ] ~ [ alpha ] ~ [ m68k ] ~ [ mips ] ~ [ ppc ] ~ [ sparc ] ~ [ sparc64 ] ~

  1 // SPDX-License-Identifier: GPL-2.0
  2 #include <errno.h>
  3 #include <inttypes.h>
  4 #include <limits.h>
  5 #include <stdbool.h>
  6 #include <stdio.h>
  7 #include <unistd.h>
  8 #include <linux/types.h>
  9 #include <sys/prctl.h>
 10 #include <perf/cpumap.h>
 11 #include <perf/evlist.h>
 12 #include <perf/mmap.h>
 13 
 14 #include "debug.h"
 15 #include "parse-events.h"
 16 #include "evlist.h"
 17 #include "evsel.h"
 18 #include "thread_map.h"
 19 #include "record.h"
 20 #include "tsc.h"
 21 #include "mmap.h"
 22 #include "tests.h"
 23 #include "pmu.h"
 24 #include "pmu-hybrid.h"
 25 
 26 /*
 27  * Except x86_64/i386 and Arm64, other archs don't support TSC in perf.  Just
 28  * enable the test for x86_64/i386 and Arm64 archs.
 29  */
 30 #if defined(__x86_64__) || defined(__i386__) || defined(__aarch64__)
 31 #define TSC_IS_SUPPORTED 1
 32 #else
 33 #define TSC_IS_SUPPORTED 0
 34 #endif
 35 
 36 #define CHECK__(x) {                            \
 37         while ((x) < 0) {                       \
 38                 pr_debug(#x " failed!\n");      \
 39                 goto out_err;                   \
 40         }                                       \
 41 }
 42 
 43 #define CHECK_NOT_NULL__(x) {                   \
 44         while ((x) == NULL) {                   \
 45                 pr_debug(#x " failed!\n");      \
 46                 goto out_err;                   \
 47         }                                       \
 48 }
 49 
 50 /**
 51  * test__perf_time_to_tsc - test converting perf time to TSC.
 52  *
 53  * This function implements a test that checks that the conversion of perf time
 54  * to and from TSC is consistent with the order of events.  If the test passes
 55  * %0 is returned, otherwise %-1 is returned.  If TSC conversion is not
 56  * supported then then the test passes but " (not supported)" is printed.
 57  */
 58 static int test__perf_time_to_tsc(struct test_suite *test __maybe_unused, int subtest __maybe_unused)
 59 {
 60         struct record_opts opts = {
 61                 .mmap_pages          = UINT_MAX,
 62                 .user_freq           = UINT_MAX,
 63                 .user_interval       = ULLONG_MAX,
 64                 .target              = {
 65                         .uses_mmap   = true,
 66                 },
 67                 .sample_time         = true,
 68         };
 69         struct perf_thread_map *threads = NULL;
 70         struct perf_cpu_map *cpus = NULL;
 71         struct evlist *evlist = NULL;
 72         struct evsel *evsel = NULL;
 73         int err = -1, ret, i;
 74         const char *comm1, *comm2;
 75         struct perf_tsc_conversion tc;
 76         struct perf_event_mmap_page *pc;
 77         union perf_event *event;
 78         u64 test_tsc, comm1_tsc, comm2_tsc;
 79         u64 test_time, comm1_time = 0, comm2_time = 0;
 80         struct mmap *md;
 81 
 82         if (!TSC_IS_SUPPORTED) {
 83                 pr_debug("Test not supported on this architecture");
 84                 return TEST_SKIP;
 85         }
 86 
 87         threads = thread_map__new(-1, getpid(), UINT_MAX);
 88         CHECK_NOT_NULL__(threads);
 89 
 90         cpus = perf_cpu_map__new(NULL);
 91         CHECK_NOT_NULL__(cpus);
 92 
 93         evlist = evlist__new();
 94         CHECK_NOT_NULL__(evlist);
 95 
 96         perf_evlist__set_maps(&evlist->core, cpus, threads);
 97 
 98         CHECK__(parse_events(evlist, "cycles:u", NULL));
 99 
100         evlist__config(evlist, &opts, NULL);
101 
102         evsel = evlist__first(evlist);
103 
104         evsel->core.attr.comm = 1;
105         evsel->core.attr.disabled = 1;
106         evsel->core.attr.enable_on_exec = 0;
107 
108         /*
109          * For hybrid "cycles:u", it creates two events.
110          * Init the second evsel here.
111          */
112         if (perf_pmu__has_hybrid() && perf_pmu__hybrid_mounted("cpu_atom")) {
113                 evsel = evsel__next(evsel);
114                 evsel->core.attr.comm = 1;
115                 evsel->core.attr.disabled = 1;
116                 evsel->core.attr.enable_on_exec = 0;
117         }
118 
119         CHECK__(evlist__open(evlist));
120 
121         CHECK__(evlist__mmap(evlist, UINT_MAX));
122 
123         pc = evlist->mmap[0].core.base;
124         ret = perf_read_tsc_conversion(pc, &tc);
125         if (ret) {
126                 if (ret == -EOPNOTSUPP) {
127                         fprintf(stderr, " (not supported)");
128                         return 0;
129                 }
130                 goto out_err;
131         }
132 
133         evlist__enable(evlist);
134 
135         comm1 = "Test COMM 1";
136         CHECK__(prctl(PR_SET_NAME, (unsigned long)comm1, 0, 0, 0));
137 
138         test_tsc = rdtsc();
139 
140         comm2 = "Test COMM 2";
141         CHECK__(prctl(PR_SET_NAME, (unsigned long)comm2, 0, 0, 0));
142 
143         evlist__disable(evlist);
144 
145         for (i = 0; i < evlist->core.nr_mmaps; i++) {
146                 md = &evlist->mmap[i];
147                 if (perf_mmap__read_init(&md->core) < 0)
148                         continue;
149 
150                 while ((event = perf_mmap__read_event(&md->core)) != NULL) {
151                         struct perf_sample sample;
152 
153                         if (event->header.type != PERF_RECORD_COMM ||
154                             (pid_t)event->comm.pid != getpid() ||
155                             (pid_t)event->comm.tid != getpid())
156                                 goto next_event;
157 
158                         if (strcmp(event->comm.comm, comm1) == 0) {
159                                 CHECK__(evsel__parse_sample(evsel, event, &sample));
160                                 comm1_time = sample.time;
161                         }
162                         if (strcmp(event->comm.comm, comm2) == 0) {
163                                 CHECK__(evsel__parse_sample(evsel, event, &sample));
164                                 comm2_time = sample.time;
165                         }
166 next_event:
167                         perf_mmap__consume(&md->core);
168                 }
169                 perf_mmap__read_done(&md->core);
170         }
171 
172         if (!comm1_time || !comm2_time)
173                 goto out_err;
174 
175         test_time = tsc_to_perf_time(test_tsc, &tc);
176         comm1_tsc = perf_time_to_tsc(comm1_time, &tc);
177         comm2_tsc = perf_time_to_tsc(comm2_time, &tc);
178 
179         pr_debug("1st event perf time %"PRIu64" tsc %"PRIu64"\n",
180                  comm1_time, comm1_tsc);
181         pr_debug("rdtsc          time %"PRIu64" tsc %"PRIu64"\n",
182                  test_time, test_tsc);
183         pr_debug("2nd event perf time %"PRIu64" tsc %"PRIu64"\n",
184                  comm2_time, comm2_tsc);
185 
186         if (test_time <= comm1_time ||
187             test_time >= comm2_time)
188                 goto out_err;
189 
190         if (test_tsc <= comm1_tsc ||
191             test_tsc >= comm2_tsc)
192                 goto out_err;
193 
194         err = 0;
195 
196 out_err:
197         evlist__delete(evlist);
198         perf_cpu_map__put(cpus);
199         perf_thread_map__put(threads);
200         return err;
201 }
202 
203 DEFINE_SUITE("Convert perf time to TSC", perf_time_to_tsc);
204 

~ [ source navigation ] ~ [ diff markup ] ~ [ identifier search ] ~

kernel.org | git.kernel.org | LWN.net | Project Home | Wiki (Japanese) | Wiki (English) | SVN repository | Mail admin

Linux® is a registered trademark of Linus Torvalds in the United States and other countries.
TOMOYO® is a registered trademark of NTT DATA CORPORATION.

osdn.jp