--- /dev/null
+/*
+ * The struct perf_event_attr test support.
+ *
+ * This test is embedded inside into perf directly and is governed
+ * by the PERF_TEST_ATTR environment variable and hook inside
+ * sys_perf_event_open function.
+ *
+ * The general idea is to store 'struct perf_event_attr' details for
+ * each event created within single perf command. Each event details
+ * are stored into separate text file. Once perf command is finished
+ * these files can be checked for values we expect for command.
+ *
+ * Besides 'struct perf_event_attr' values we also store 'fd' and
+ * 'group_fd' values to allow checking for groups created.
+ *
+ * This all is triggered by setting PERF_TEST_ATTR environment variable.
+ * It must contain name of existing directory with access and write
+ * permissions. All the event text files are stored there.
+ */
+
+#include <stdlib.h>
+#include <stdio.h>
+#include <linux/types.h>
+#include <linux/kernel.h>
+#include "../perf.h"
+#include "util.h"
+#include "exec_cmd.h"
+#include "tests.h"
+
+#define ENV "PERF_TEST_ATTR"
+
+extern int verbose;
+
+static char *dir;
+
+void test_attr__init(void)
+{
+ dir = getenv(ENV);
+ test_attr__enabled = (dir != NULL);
+}
+
+#define BUFSIZE 1024
+
+#define __WRITE_ASS(str, fmt, data) \
+do { \
+ char buf[BUFSIZE]; \
+ size_t size; \
+ \
+ size = snprintf(buf, BUFSIZE, #str "=%"fmt "\n", data); \
+ if (1 != fwrite(buf, size, 1, file)) { \
+ perror("test attr - failed to write event file"); \
+ fclose(file); \
+ return -1; \
+ } \
+ \
+} while (0)
+
+#define WRITE_ASS(field, fmt) __WRITE_ASS(field, fmt, attr->field)
+
+static int store_event(struct perf_event_attr *attr, pid_t pid, int cpu,
+ int fd, int group_fd, unsigned long flags)
+{
+ FILE *file;
+ char path[PATH_MAX];
+
+ snprintf(path, PATH_MAX, "%s/event-%d-%llu-%d", dir,
+ attr->type, attr->config, fd);
+
+ file = fopen(path, "w+");
+ if (!file) {
+ perror("test attr - failed to open event file");
+ return -1;
+ }
+
+ if (fprintf(file, "[event-%d-%llu-%d]\n",
+ attr->type, attr->config, fd) < 0) {
+ perror("test attr - failed to write event file");
+ fclose(file);
+ return -1;
+ }
+
+ /* syscall arguments */
+ __WRITE_ASS(fd, "d", fd);
+ __WRITE_ASS(group_fd, "d", group_fd);
+ __WRITE_ASS(cpu, "d", cpu);
+ __WRITE_ASS(pid, "d", pid);
+ __WRITE_ASS(flags, "lu", flags);
+
+ /* struct perf_event_attr */
+ WRITE_ASS(type, PRIu32);
+ WRITE_ASS(size, PRIu32);
+ WRITE_ASS(config, "llu");
+ WRITE_ASS(sample_period, "llu");
+ WRITE_ASS(sample_type, "llu");
+ WRITE_ASS(read_format, "llu");
+ WRITE_ASS(disabled, "d");
+ WRITE_ASS(inherit, "d");
+ WRITE_ASS(pinned, "d");
+ WRITE_ASS(exclusive, "d");
+ WRITE_ASS(exclude_user, "d");
+ WRITE_ASS(exclude_kernel, "d");
+ WRITE_ASS(exclude_hv, "d");
+ WRITE_ASS(exclude_idle, "d");
+ WRITE_ASS(mmap, "d");
+ WRITE_ASS(comm, "d");
+ WRITE_ASS(freq, "d");
+ WRITE_ASS(inherit_stat, "d");
+ WRITE_ASS(enable_on_exec, "d");
+ WRITE_ASS(task, "d");
+ WRITE_ASS(watermark, "d");
+ WRITE_ASS(precise_ip, "d");
+ WRITE_ASS(mmap_data, "d");
+ WRITE_ASS(sample_id_all, "d");
+ WRITE_ASS(exclude_host, "d");
+ WRITE_ASS(exclude_guest, "d");
+ WRITE_ASS(exclude_callchain_kernel, "d");
+ WRITE_ASS(exclude_callchain_user, "d");
+ WRITE_ASS(wakeup_events, PRIu32);
+ WRITE_ASS(bp_type, PRIu32);
+ WRITE_ASS(config1, "llu");
+ WRITE_ASS(config2, "llu");
+ WRITE_ASS(branch_sample_type, "llu");
+ WRITE_ASS(sample_regs_user, "llu");
+ WRITE_ASS(sample_stack_user, PRIu32);
+
+ fclose(file);
+ return 0;
+}
+
+void test_attr__open(struct perf_event_attr *attr, pid_t pid, int cpu,
+ int fd, int group_fd, unsigned long flags)
+{
+ int errno_saved = errno;
+
+ if (store_event(attr, pid, cpu, fd, group_fd, flags))
+ die("test attr FAILED");
+
+ errno = errno_saved;
+}
+
+static int run_dir(const char *d, const char *perf)
+{
+ char v[] = "-vvvvv";
+ int vcnt = min(verbose, (int) sizeof(v) - 1);
+ char cmd[3*PATH_MAX];
+
+ if (verbose)
+ vcnt++;
+
+ snprintf(cmd, 3*PATH_MAX, PYTHON " %s/attr.py -d %s/attr/ -p %s %.*s",
+ d, d, perf, vcnt, v);
+
+ return system(cmd);
+}
+
+int test__attr(void)
+{
+ struct stat st;
+ char path_perf[PATH_MAX];
+ char path_dir[PATH_MAX];
+
+ /* First try developement tree tests. */
+ if (!lstat("./tests", &st))
+ return run_dir("./tests", "./perf");
+
+ /* Then installed path. */
+ snprintf(path_dir, PATH_MAX, "%s/tests", perf_exec_path());
+ snprintf(path_perf, PATH_MAX, "%s/perf", BINDIR);
+
+ if (!lstat(path_dir, &st) &&
+ !lstat(path_perf, &st))
+ return run_dir(path_dir, path_perf);
+
+ fprintf(stderr, " (omitted)");
+ return 0;
+}
Code Review / kvmfornfv.git / blobdiff