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![Jiri Olsa](/assets/img/avatar_default.png)
We create many test events before the real ones just to test specific features. But there's no way for attr tests to separate those test events from those it needs to check. Adding 'ready' call from the events open interface to trigger/start events collection for attr test. Signed-off-by: Jiri Olsa <jolsa@kernel.org> Cc: David Ahern <dsahern@gmail.com> Cc: Namhyung Kim <namhyung@kernel.org> Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: Thomas Richter <tmricht@linux.vnet.ibm.com> Link: http://lkml.kernel.org/r/20170703145030.12903-4-jolsa@kernel.org Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
191 lines
4.8 KiB
C
191 lines
4.8 KiB
C
/*
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* The struct perf_event_attr test support.
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*
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* This test is embedded inside into perf directly and is governed
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* by the PERF_TEST_ATTR environment variable and hook inside
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* sys_perf_event_open function.
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*
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* The general idea is to store 'struct perf_event_attr' details for
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* each event created within single perf command. Each event details
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* are stored into separate text file. Once perf command is finished
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* these files can be checked for values we expect for command.
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*
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* Besides 'struct perf_event_attr' values we also store 'fd' and
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* 'group_fd' values to allow checking for groups created.
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*
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* This all is triggered by setting PERF_TEST_ATTR environment variable.
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* It must contain name of existing directory with access and write
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* permissions. All the event text files are stored there.
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*/
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#include <debug.h>
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#include <errno.h>
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#include <inttypes.h>
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#include <stdlib.h>
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#include <stdio.h>
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#include <linux/types.h>
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#include <linux/kernel.h>
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#include <sys/param.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <unistd.h>
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#include "../perf.h"
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#include <subcmd/exec-cmd.h>
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#include "tests.h"
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#define ENV "PERF_TEST_ATTR"
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static char *dir;
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static bool ready;
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void test_attr__init(void)
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{
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dir = getenv(ENV);
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test_attr__enabled = (dir != NULL);
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}
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#define BUFSIZE 1024
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#define __WRITE_ASS(str, fmt, data) \
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do { \
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char buf[BUFSIZE]; \
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size_t size; \
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\
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size = snprintf(buf, BUFSIZE, #str "=%"fmt "\n", data); \
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if (1 != fwrite(buf, size, 1, file)) { \
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perror("test attr - failed to write event file"); \
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fclose(file); \
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return -1; \
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} \
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\
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} while (0)
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#define WRITE_ASS(field, fmt) __WRITE_ASS(field, fmt, attr->field)
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static int store_event(struct perf_event_attr *attr, pid_t pid, int cpu,
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int fd, int group_fd, unsigned long flags)
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{
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FILE *file;
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char path[PATH_MAX];
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if (!ready)
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return 0;
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snprintf(path, PATH_MAX, "%s/event-%d-%llu-%d", dir,
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attr->type, attr->config, fd);
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file = fopen(path, "w+");
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if (!file) {
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perror("test attr - failed to open event file");
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return -1;
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}
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if (fprintf(file, "[event-%d-%llu-%d]\n",
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attr->type, attr->config, fd) < 0) {
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perror("test attr - failed to write event file");
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fclose(file);
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return -1;
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}
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/* syscall arguments */
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__WRITE_ASS(fd, "d", fd);
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__WRITE_ASS(group_fd, "d", group_fd);
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__WRITE_ASS(cpu, "d", cpu);
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__WRITE_ASS(pid, "d", pid);
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__WRITE_ASS(flags, "lu", flags);
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/* struct perf_event_attr */
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WRITE_ASS(type, PRIu32);
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WRITE_ASS(size, PRIu32);
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WRITE_ASS(config, "llu");
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WRITE_ASS(sample_period, "llu");
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WRITE_ASS(sample_type, "llu");
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WRITE_ASS(read_format, "llu");
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WRITE_ASS(disabled, "d");
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WRITE_ASS(inherit, "d");
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WRITE_ASS(pinned, "d");
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WRITE_ASS(exclusive, "d");
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WRITE_ASS(exclude_user, "d");
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WRITE_ASS(exclude_kernel, "d");
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WRITE_ASS(exclude_hv, "d");
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WRITE_ASS(exclude_idle, "d");
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WRITE_ASS(mmap, "d");
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WRITE_ASS(comm, "d");
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WRITE_ASS(freq, "d");
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WRITE_ASS(inherit_stat, "d");
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WRITE_ASS(enable_on_exec, "d");
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WRITE_ASS(task, "d");
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WRITE_ASS(watermark, "d");
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WRITE_ASS(precise_ip, "d");
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WRITE_ASS(mmap_data, "d");
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WRITE_ASS(sample_id_all, "d");
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WRITE_ASS(exclude_host, "d");
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WRITE_ASS(exclude_guest, "d");
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WRITE_ASS(exclude_callchain_kernel, "d");
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WRITE_ASS(exclude_callchain_user, "d");
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WRITE_ASS(wakeup_events, PRIu32);
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WRITE_ASS(bp_type, PRIu32);
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WRITE_ASS(config1, "llu");
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WRITE_ASS(config2, "llu");
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WRITE_ASS(branch_sample_type, "llu");
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WRITE_ASS(sample_regs_user, "llu");
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WRITE_ASS(sample_stack_user, PRIu32);
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fclose(file);
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return 0;
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}
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void test_attr__open(struct perf_event_attr *attr, pid_t pid, int cpu,
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int fd, int group_fd, unsigned long flags)
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{
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int errno_saved = errno;
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if ((fd != -1) && store_event(attr, pid, cpu, fd, group_fd, flags)) {
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pr_err("test attr FAILED");
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exit(128);
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}
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errno = errno_saved;
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}
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void test_attr__ready(void)
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{
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if (unlikely(test_attr__enabled) && !ready)
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ready = true;
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}
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static int run_dir(const char *d, const char *perf)
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{
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char v[] = "-vvvvv";
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int vcnt = min(verbose, (int) sizeof(v) - 1);
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char cmd[3*PATH_MAX];
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if (verbose > 0)
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vcnt++;
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snprintf(cmd, 3*PATH_MAX, PYTHON " %s/attr.py -d %s/attr/ -p %s %.*s",
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d, d, perf, vcnt, v);
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return system(cmd);
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}
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int test__attr(int subtest __maybe_unused)
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{
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struct stat st;
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char path_perf[PATH_MAX];
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char path_dir[PATH_MAX];
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/* First try developement tree tests. */
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if (!lstat("./tests", &st))
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return run_dir("./tests", "./perf");
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/* Then installed path. */
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snprintf(path_dir, PATH_MAX, "%s/tests", get_argv_exec_path());
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snprintf(path_perf, PATH_MAX, "%s/perf", BINDIR);
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if (!lstat(path_dir, &st) &&
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!lstat(path_perf, &st))
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return run_dir(path_dir, path_perf);
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return TEST_SKIP;
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}
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