perf tools: Remove junk code in mmap size handling
[linux-2.6.git] / tools / perf / builtin-test.c
index 035b9fa..11e3c84 100644 (file)
@@ -7,10 +7,11 @@
 
 #include "util/cache.h"
 #include "util/debug.h"
+#include "util/evlist.h"
 #include "util/parse-options.h"
-#include "util/session.h"
+#include "util/parse-events.h"
 #include "util/symbol.h"
-#include "util/thread.h"
+#include "util/thread_map.h"
 
 static long page_size;
 
@@ -119,10 +120,16 @@ static int test__vmlinux_matches_kallsyms(void)
         * end addresses too.
         */
        for (nd = rb_first(&vmlinux_map->dso->symbols[type]); nd; nd = rb_next(nd)) {
-               struct symbol *pair;
+               struct symbol *pair, *first_pair;
+               bool backwards = true;
 
                sym  = rb_entry(nd, struct symbol, rb_node);
-               pair = machine__find_kernel_symbol(&kallsyms, type, sym->start, NULL, NULL);
+
+               if (sym->start == sym->end)
+                       continue;
+
+               first_pair = machine__find_kernel_symbol(&kallsyms, type, sym->start, NULL, NULL);
+               pair = first_pair;
 
                if (pair && pair->start == sym->start) {
 next_pair:
@@ -140,11 +147,13 @@ next_pair:
                                if (llabs(skew) < page_size)
                                        continue;
 
-                               pr_debug("%#Lx: diff end addr for %s v: %#Lx k: %#Lx\n",
+                               pr_debug("%#" PRIx64 ": diff end addr for %s v: %#" PRIx64 " k: %#" PRIx64 "\n",
                                         sym->start, sym->name, sym->end, pair->end);
                        } else {
-                               struct rb_node *nnd = rb_prev(&pair->rb_node);
-
+                               struct rb_node *nnd;
+detour:
+                               nnd = backwards ? rb_prev(&pair->rb_node) :
+                                                 rb_next(&pair->rb_node);
                                if (nnd) {
                                        struct symbol *next = rb_entry(nnd, struct symbol, rb_node);
 
@@ -153,11 +162,18 @@ next_pair:
                                                goto next_pair;
                                        }
                                }
-                               pr_debug("%#Lx: diff name v: %s k: %s\n",
+
+                               if (backwards) {
+                                       backwards = false;
+                                       pair = first_pair;
+                                       goto detour;
+                               }
+
+                               pr_debug("%#" PRIx64 ": diff name v: %s k: %s\n",
                                         sym->start, sym->name, pair->name);
                        }
                } else
-                       pr_debug("%#Lx: %s not on kallsyms\n", sym->start, sym->name);
+                       pr_debug("%#" PRIx64 ": %s not on kallsyms\n", sym->start, sym->name);
 
                err = -1;
        }
@@ -196,10 +212,10 @@ next_pair:
 
                if (pair->start == pos->start) {
                        pair->priv = 1;
-                       pr_info(" %Lx-%Lx %Lx %s in kallsyms as",
+                       pr_info(" %" PRIx64 "-%" PRIx64 " %" PRIx64 " %s in kallsyms as",
                                pos->start, pos->end, pos->pgoff, pos->dso->name);
                        if (pos->pgoff != pair->pgoff || pos->end != pair->end)
-                               pr_info(": \n*%Lx-%Lx %Lx",
+                               pr_info(": \n*%" PRIx64 "-%" PRIx64 " %" PRIx64 "",
                                        pair->start, pair->end, pair->pgoff);
                        pr_info(" %s\n", pair->dso->name);
                        pair->priv = 1;
@@ -219,6 +235,364 @@ out:
        return err;
 }
 
+#include "util/cpumap.h"
+#include "util/evsel.h"
+#include <sys/types.h>
+
+static int trace_event__id(const char *evname)
+{
+       char *filename;
+       int err = -1, fd;
+
+       if (asprintf(&filename,
+                    "/sys/kernel/debug/tracing/events/syscalls/%s/id",
+                    evname) < 0)
+               return -1;
+
+       fd = open(filename, O_RDONLY);
+       if (fd >= 0) {
+               char id[16];
+               if (read(fd, id, sizeof(id)) > 0)
+                       err = atoi(id);
+               close(fd);
+       }
+
+       free(filename);
+       return err;
+}
+
+static int test__open_syscall_event(void)
+{
+       int err = -1, fd;
+       struct thread_map *threads;
+       struct perf_evsel *evsel;
+       struct perf_event_attr attr;
+       unsigned int nr_open_calls = 111, i;
+       int id = trace_event__id("sys_enter_open");
+
+       if (id < 0) {
+               pr_debug("is debugfs mounted on /sys/kernel/debug?\n");
+               return -1;
+       }
+
+       threads = thread_map__new(-1, getpid());
+       if (threads == NULL) {
+               pr_debug("thread_map__new\n");
+               return -1;
+       }
+
+       memset(&attr, 0, sizeof(attr));
+       attr.type = PERF_TYPE_TRACEPOINT;
+       attr.config = id;
+       evsel = perf_evsel__new(&attr, 0);
+       if (evsel == NULL) {
+               pr_debug("perf_evsel__new\n");
+               goto out_thread_map_delete;
+       }
+
+       if (perf_evsel__open_per_thread(evsel, threads, false) < 0) {
+               pr_debug("failed to open counter: %s, "
+                        "tweak /proc/sys/kernel/perf_event_paranoid?\n",
+                        strerror(errno));
+               goto out_evsel_delete;
+       }
+
+       for (i = 0; i < nr_open_calls; ++i) {
+               fd = open("/etc/passwd", O_RDONLY);
+               close(fd);
+       }
+
+       if (perf_evsel__read_on_cpu(evsel, 0, 0) < 0) {
+               pr_debug("perf_evsel__read_on_cpu\n");
+               goto out_close_fd;
+       }
+
+       if (evsel->counts->cpu[0].val != nr_open_calls) {
+               pr_debug("perf_evsel__read_on_cpu: expected to intercept %d calls, got %" PRIu64 "\n",
+                        nr_open_calls, evsel->counts->cpu[0].val);
+               goto out_close_fd;
+       }
+       
+       err = 0;
+out_close_fd:
+       perf_evsel__close_fd(evsel, 1, threads->nr);
+out_evsel_delete:
+       perf_evsel__delete(evsel);
+out_thread_map_delete:
+       thread_map__delete(threads);
+       return err;
+}
+
+#include <sched.h>
+
+static int test__open_syscall_event_on_all_cpus(void)
+{
+       int err = -1, fd, cpu;
+       struct thread_map *threads;
+       struct cpu_map *cpus;
+       struct perf_evsel *evsel;
+       struct perf_event_attr attr;
+       unsigned int nr_open_calls = 111, i;
+       cpu_set_t cpu_set;
+       int id = trace_event__id("sys_enter_open");
+
+       if (id < 0) {
+               pr_debug("is debugfs mounted on /sys/kernel/debug?\n");
+               return -1;
+       }
+
+       threads = thread_map__new(-1, getpid());
+       if (threads == NULL) {
+               pr_debug("thread_map__new\n");
+               return -1;
+       }
+
+       cpus = cpu_map__new(NULL);
+       if (cpus == NULL) {
+               pr_debug("cpu_map__new\n");
+               goto out_thread_map_delete;
+       }
+
+
+       CPU_ZERO(&cpu_set);
+
+       memset(&attr, 0, sizeof(attr));
+       attr.type = PERF_TYPE_TRACEPOINT;
+       attr.config = id;
+       evsel = perf_evsel__new(&attr, 0);
+       if (evsel == NULL) {
+               pr_debug("perf_evsel__new\n");
+               goto out_thread_map_delete;
+       }
+
+       if (perf_evsel__open(evsel, cpus, threads, false) < 0) {
+               pr_debug("failed to open counter: %s, "
+                        "tweak /proc/sys/kernel/perf_event_paranoid?\n",
+                        strerror(errno));
+               goto out_evsel_delete;
+       }
+
+       for (cpu = 0; cpu < cpus->nr; ++cpu) {
+               unsigned int ncalls = nr_open_calls + cpu;
+               /*
+                * XXX eventually lift this restriction in a way that
+                * keeps perf building on older glibc installations
+                * without CPU_ALLOC. 1024 cpus in 2010 still seems
+                * a reasonable upper limit tho :-)
+                */
+               if (cpus->map[cpu] >= CPU_SETSIZE) {
+                       pr_debug("Ignoring CPU %d\n", cpus->map[cpu]);
+                       continue;
+               }
+
+               CPU_SET(cpus->map[cpu], &cpu_set);
+               if (sched_setaffinity(0, sizeof(cpu_set), &cpu_set) < 0) {
+                       pr_debug("sched_setaffinity() failed on CPU %d: %s ",
+                                cpus->map[cpu],
+                                strerror(errno));
+                       goto out_close_fd;
+               }
+               for (i = 0; i < ncalls; ++i) {
+                       fd = open("/etc/passwd", O_RDONLY);
+                       close(fd);
+               }
+               CPU_CLR(cpus->map[cpu], &cpu_set);
+       }
+
+       /*
+        * Here we need to explicitely preallocate the counts, as if
+        * we use the auto allocation it will allocate just for 1 cpu,
+        * as we start by cpu 0.
+        */
+       if (perf_evsel__alloc_counts(evsel, cpus->nr) < 0) {
+               pr_debug("perf_evsel__alloc_counts(ncpus=%d)\n", cpus->nr);
+               goto out_close_fd;
+       }
+
+       err = 0;
+
+       for (cpu = 0; cpu < cpus->nr; ++cpu) {
+               unsigned int expected;
+
+               if (cpus->map[cpu] >= CPU_SETSIZE)
+                       continue;
+
+               if (perf_evsel__read_on_cpu(evsel, cpu, 0) < 0) {
+                       pr_debug("perf_evsel__read_on_cpu\n");
+                       err = -1;
+                       break;
+               }
+
+               expected = nr_open_calls + cpu;
+               if (evsel->counts->cpu[cpu].val != expected) {
+                       pr_debug("perf_evsel__read_on_cpu: expected to intercept %d calls on cpu %d, got %" PRIu64 "\n",
+                                expected, cpus->map[cpu], evsel->counts->cpu[cpu].val);
+                       err = -1;
+               }
+       }
+
+out_close_fd:
+       perf_evsel__close_fd(evsel, 1, threads->nr);
+out_evsel_delete:
+       perf_evsel__delete(evsel);
+out_thread_map_delete:
+       thread_map__delete(threads);
+       return err;
+}
+
+/*
+ * This test will generate random numbers of calls to some getpid syscalls,
+ * then establish an mmap for a group of events that are created to monitor
+ * the syscalls.
+ *
+ * It will receive the events, using mmap, use its PERF_SAMPLE_ID generated
+ * sample.id field to map back to its respective perf_evsel instance.
+ *
+ * Then it checks if the number of syscalls reported as perf events by
+ * the kernel corresponds to the number of syscalls made.
+ */
+static int test__basic_mmap(void)
+{
+       int err = -1;
+       union perf_event *event;
+       struct thread_map *threads;
+       struct cpu_map *cpus;
+       struct perf_evlist *evlist;
+       struct perf_event_attr attr = {
+               .type           = PERF_TYPE_TRACEPOINT,
+               .read_format    = PERF_FORMAT_ID,
+               .sample_type    = PERF_SAMPLE_ID,
+               .watermark      = 0,
+       };
+       cpu_set_t cpu_set;
+       const char *syscall_names[] = { "getsid", "getppid", "getpgrp",
+                                       "getpgid", };
+       pid_t (*syscalls[])(void) = { (void *)getsid, getppid, getpgrp,
+                                     (void*)getpgid };
+#define nsyscalls ARRAY_SIZE(syscall_names)
+       int ids[nsyscalls];
+       unsigned int nr_events[nsyscalls],
+                    expected_nr_events[nsyscalls], i, j;
+       struct perf_evsel *evsels[nsyscalls], *evsel;
+
+       for (i = 0; i < nsyscalls; ++i) {
+               char name[64];
+
+               snprintf(name, sizeof(name), "sys_enter_%s", syscall_names[i]);
+               ids[i] = trace_event__id(name);
+               if (ids[i] < 0) {
+                       pr_debug("Is debugfs mounted on /sys/kernel/debug?\n");
+                       return -1;
+               }
+               nr_events[i] = 0;
+               expected_nr_events[i] = random() % 257;
+       }
+
+       threads = thread_map__new(-1, getpid());
+       if (threads == NULL) {
+               pr_debug("thread_map__new\n");
+               return -1;
+       }
+
+       cpus = cpu_map__new(NULL);
+       if (cpus == NULL) {
+               pr_debug("cpu_map__new\n");
+               goto out_free_threads;
+       }
+
+       CPU_ZERO(&cpu_set);
+       CPU_SET(cpus->map[0], &cpu_set);
+       sched_setaffinity(0, sizeof(cpu_set), &cpu_set);
+       if (sched_setaffinity(0, sizeof(cpu_set), &cpu_set) < 0) {
+               pr_debug("sched_setaffinity() failed on CPU %d: %s ",
+                        cpus->map[0], strerror(errno));
+               goto out_free_cpus;
+       }
+
+       evlist = perf_evlist__new(cpus, threads);
+       if (evlist == NULL) {
+               pr_debug("perf_evlist__new\n");
+               goto out_free_cpus;
+       }
+
+       /* anonymous union fields, can't be initialized above */
+       attr.wakeup_events = 1;
+       attr.sample_period = 1;
+
+       for (i = 0; i < nsyscalls; ++i) {
+               attr.config = ids[i];
+               evsels[i] = perf_evsel__new(&attr, i);
+               if (evsels[i] == NULL) {
+                       pr_debug("perf_evsel__new\n");
+                       goto out_free_evlist;
+               }
+
+               perf_evlist__add(evlist, evsels[i]);
+
+               if (perf_evsel__open(evsels[i], cpus, threads, false) < 0) {
+                       pr_debug("failed to open counter: %s, "
+                                "tweak /proc/sys/kernel/perf_event_paranoid?\n",
+                                strerror(errno));
+                       goto out_close_fd;
+               }
+       }
+
+       if (perf_evlist__mmap(evlist, 128, true) < 0) {
+               pr_debug("failed to mmap events: %d (%s)\n", errno,
+                        strerror(errno));
+               goto out_close_fd;
+       }
+
+       for (i = 0; i < nsyscalls; ++i)
+               for (j = 0; j < expected_nr_events[i]; ++j) {
+                       int foo = syscalls[i]();
+                       ++foo;
+               }
+
+       while ((event = perf_evlist__read_on_cpu(evlist, 0)) != NULL) {
+               struct perf_sample sample;
+
+               if (event->header.type != PERF_RECORD_SAMPLE) {
+                       pr_debug("unexpected %s event\n",
+                                perf_event__name(event->header.type));
+                       goto out_munmap;
+               }
+
+               perf_event__parse_sample(event, attr.sample_type, false, &sample);
+               evsel = perf_evlist__id2evsel(evlist, sample.id);
+               if (evsel == NULL) {
+                       pr_debug("event with id %" PRIu64
+                                " doesn't map to an evsel\n", sample.id);
+                       goto out_munmap;
+               }
+               nr_events[evsel->idx]++;
+       }
+
+       list_for_each_entry(evsel, &evlist->entries, node) {
+               if (nr_events[evsel->idx] != expected_nr_events[evsel->idx]) {
+                       pr_debug("expected %d %s events, got %d\n",
+                                expected_nr_events[evsel->idx],
+                                event_name(evsel), nr_events[evsel->idx]);
+                       goto out_munmap;
+               }
+       }
+
+       err = 0;
+out_munmap:
+       perf_evlist__munmap(evlist);
+out_close_fd:
+       for (i = 0; i < nsyscalls; ++i)
+               perf_evsel__close_fd(evsels[i], 1, threads->nr);
+out_free_evlist:
+       perf_evlist__delete(evlist);
+out_free_cpus:
+       cpu_map__delete(cpus);
+out_free_threads:
+       thread_map__delete(threads);
+       return err;
+#undef nsyscalls
+}
+
 static struct test {
        const char *desc;
        int (*func)(void);
@@ -228,6 +602,18 @@ static struct test {
                .func = test__vmlinux_matches_kallsyms,
        },
        {
+               .desc = "detect open syscall event",
+               .func = test__open_syscall_event,
+       },
+       {
+               .desc = "detect open syscall event on all cpus",
+               .func = test__open_syscall_event_on_all_cpus,
+       },
+       {
+               .desc = "read samples using the mmap interface",
+               .func = test__basic_mmap,
+       },
+       {
                .func = NULL,
        },
 };