cregit-Linux how code gets into the kernel

Release 4.10 tools/perf/tests/attr.c

Directory: tools/perf/tests
 * 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 <subcmd/exec-cmd.h>
#include "tests.h"


extern int verbose;

static char *dir;

void test_attr__init(void) { dir = getenv(ENV); test_attr__enabled = (dir != NULL); }


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#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; }


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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; }


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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/ -d %s/attr/ -p %s %.*s", d, d, perf, vcnt, v); return system(cmd); }


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int test__attr(int subtest __maybe_unused) { 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", get_argv_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); return TEST_SKIP; }


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Overall Contributors

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arnaldo carvalho de meloarnaldo carvalho de melo30.40%19.09%
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wang nanwang nan10.13%19.09%
namhyung kimnamhyung kim10.13%19.09%
Directory: tools/perf/tests
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