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168 lines
3.7 KiB
168 lines
3.7 KiB
// SPDX-License-Identifier: GPL-2.0 |
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/* |
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* Test backward bit in event attribute, read ring buffer from end to |
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* beginning |
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*/ |
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#include <evlist.h> |
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#include <sys/prctl.h> |
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#include "record.h" |
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#include "tests.h" |
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#include "debug.h" |
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#include "parse-events.h" |
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#include "util/mmap.h" |
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#include <errno.h> |
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#include <linux/string.h> |
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#include <perf/mmap.h> |
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#define NR_ITERS 111 |
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static void testcase(void) |
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{ |
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int i; |
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for (i = 0; i < NR_ITERS; i++) { |
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char proc_name[15]; |
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snprintf(proc_name, sizeof(proc_name), "p:%d\n", i); |
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prctl(PR_SET_NAME, proc_name); |
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} |
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} |
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static int count_samples(struct evlist *evlist, int *sample_count, |
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int *comm_count) |
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{ |
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int i; |
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for (i = 0; i < evlist->core.nr_mmaps; i++) { |
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struct mmap *map = &evlist->overwrite_mmap[i]; |
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union perf_event *event; |
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perf_mmap__read_init(&map->core); |
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while ((event = perf_mmap__read_event(&map->core)) != NULL) { |
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const u32 type = event->header.type; |
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switch (type) { |
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case PERF_RECORD_SAMPLE: |
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(*sample_count)++; |
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break; |
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case PERF_RECORD_COMM: |
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(*comm_count)++; |
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break; |
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default: |
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pr_err("Unexpected record of type %d\n", type); |
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return TEST_FAIL; |
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} |
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} |
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perf_mmap__read_done(&map->core); |
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} |
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return TEST_OK; |
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} |
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static int do_test(struct evlist *evlist, int mmap_pages, |
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int *sample_count, int *comm_count) |
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{ |
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int err; |
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char sbuf[STRERR_BUFSIZE]; |
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err = evlist__mmap(evlist, mmap_pages); |
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if (err < 0) { |
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pr_debug("evlist__mmap: %s\n", |
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str_error_r(errno, sbuf, sizeof(sbuf))); |
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return TEST_FAIL; |
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} |
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evlist__enable(evlist); |
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testcase(); |
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evlist__disable(evlist); |
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err = count_samples(evlist, sample_count, comm_count); |
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evlist__munmap(evlist); |
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return err; |
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} |
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int test__backward_ring_buffer(struct test *test __maybe_unused, int subtest __maybe_unused) |
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{ |
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int ret = TEST_SKIP, err, sample_count = 0, comm_count = 0; |
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char pid[16], sbuf[STRERR_BUFSIZE]; |
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struct evlist *evlist; |
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struct evsel *evsel __maybe_unused; |
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struct parse_events_error parse_error; |
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struct record_opts opts = { |
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.target = { |
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.uid = UINT_MAX, |
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.uses_mmap = true, |
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}, |
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.freq = 0, |
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.mmap_pages = 256, |
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.default_interval = 1, |
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}; |
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snprintf(pid, sizeof(pid), "%d", getpid()); |
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pid[sizeof(pid) - 1] = '\0'; |
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opts.target.tid = opts.target.pid = pid; |
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evlist = evlist__new(); |
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if (!evlist) { |
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pr_debug("Not enough memory to create evlist\n"); |
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return TEST_FAIL; |
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} |
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err = evlist__create_maps(evlist, &opts.target); |
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if (err < 0) { |
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pr_debug("Not enough memory to create thread/cpu maps\n"); |
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goto out_delete_evlist; |
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} |
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bzero(&parse_error, sizeof(parse_error)); |
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/* |
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* Set backward bit, ring buffer should be writing from end. Record |
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* it in aux evlist |
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*/ |
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err = parse_events(evlist, "syscalls:sys_enter_prctl/overwrite/", &parse_error); |
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if (err) { |
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pr_debug("Failed to parse tracepoint event, try use root\n"); |
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ret = TEST_SKIP; |
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goto out_delete_evlist; |
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} |
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evlist__config(evlist, &opts, NULL); |
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err = evlist__open(evlist); |
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if (err < 0) { |
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pr_debug("perf_evlist__open: %s\n", |
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str_error_r(errno, sbuf, sizeof(sbuf))); |
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goto out_delete_evlist; |
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} |
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ret = TEST_FAIL; |
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err = do_test(evlist, opts.mmap_pages, &sample_count, |
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&comm_count); |
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if (err != TEST_OK) |
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goto out_delete_evlist; |
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if ((sample_count != NR_ITERS) || (comm_count != NR_ITERS)) { |
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pr_err("Unexpected counter: sample_count=%d, comm_count=%d\n", |
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sample_count, comm_count); |
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goto out_delete_evlist; |
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} |
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evlist__close(evlist); |
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err = evlist__open(evlist); |
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if (err < 0) { |
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pr_debug("perf_evlist__open: %s\n", |
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str_error_r(errno, sbuf, sizeof(sbuf))); |
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goto out_delete_evlist; |
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} |
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err = do_test(evlist, 1, &sample_count, &comm_count); |
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if (err != TEST_OK) |
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goto out_delete_evlist; |
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ret = TEST_OK; |
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out_delete_evlist: |
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evlist__delete(evlist); |
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return ret; |
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}
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