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author | Jiri Olsa <jolsa@redhat.com> | 2012-10-31 15:52:47 +0100 |
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committer | Arnaldo Carvalho de Melo <acme@redhat.com> | 2012-10-31 16:20:58 -0200 |
commit | 52502bf201a85b5b51a384037a002d0b39093df0 (patch) | |
tree | c4d2bcbc4c1f7c10693b132ad70951c06c2cee86 /tools/perf/tests/attr.c | |
parent | 945aea220bb8f4bb37950549cc0b93bbec24c460 (diff) | |
download | linux-52502bf201a85b5b51a384037a002d0b39093df0.tar.gz linux-52502bf201a85b5b51a384037a002d0b39093df0.tar.bz2 linux-52502bf201a85b5b51a384037a002d0b39093df0.zip |
perf tests: Add framework for automated perf_event_attr tests
The idea is run perf session with kidnapping sys_perf_event_open
function. For each sys_perf_event_open call we store the perf_event_attr
data to the file to be checked later against what we expect.
You can run this by:
$ python ./tests/attr.py -d ./tests/attr/ -p ./perf -v
v2 changes:
- preserve errno value in the hook
Signed-off-by: Jiri Olsa <jolsa@redhat.com>
Cc: Arnaldo Carvalho de Melo <acme@ghostprotocols.net>
Cc: Corey Ashford <cjashfor@linux.vnet.ibm.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Link: http://lkml.kernel.org/r/20121031145247.GB1027@krava.brq.redhat.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Diffstat (limited to 'tools/perf/tests/attr.c')
-rw-r--r-- | tools/perf/tests/attr.c | 140 |
1 files changed, 140 insertions, 0 deletions
diff --git a/tools/perf/tests/attr.c b/tools/perf/tests/attr.c new file mode 100644 index 000000000000..55e9a873a5cb --- /dev/null +++ b/tools/perf/tests/attr.c @@ -0,0 +1,140 @@ + +/* + * 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 <inttypes.h> +#include <linux/types.h> +#include <linux/kernel.h> +#include "../perf.h" +#include "util.h" + +#define ENV "PERF_TEST_ATTR" + +bool test_attr__enabled; + +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) + +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, attr->type); + WRITE_ASS(size, PRIu32, attr->size); + WRITE_ASS(config, "llu", attr->config); + WRITE_ASS(sample_period, "llu", attr->sample_period); + WRITE_ASS(sample_type, "llu", attr->sample_type); + WRITE_ASS(read_format, "llu", attr->read_format); + WRITE_ASS(disabled, "d", attr->disabled); + WRITE_ASS(inherit, "d", attr->inherit); + WRITE_ASS(pinned, "d", attr->pinned); + WRITE_ASS(exclusive, "d", attr->exclusive); + WRITE_ASS(exclude_user, "d", attr->exclude_user); + WRITE_ASS(exclude_kernel, "d", attr->exclude_kernel); + WRITE_ASS(exclude_hv, "d", attr->exclude_hv); + WRITE_ASS(exclude_idle, "d", attr->exclude_idle); + WRITE_ASS(mmap, "d", attr->mmap); + WRITE_ASS(comm, "d", attr->comm); + WRITE_ASS(freq, "d", attr->freq); + WRITE_ASS(inherit_stat, "d", attr->inherit_stat); + WRITE_ASS(enable_on_exec, "d", attr->enable_on_exec); + WRITE_ASS(task, "d", attr->task); + WRITE_ASS(watermask, "d", attr->watermark); + WRITE_ASS(precise_ip, "d", attr->precise_ip); + WRITE_ASS(mmap_data, "d", attr->mmap_data); + WRITE_ASS(sample_id_all, "d", attr->sample_id_all); + WRITE_ASS(exclude_host, "d", attr->exclude_host); + WRITE_ASS(exclude_guest, "d", attr->exclude_guest); + WRITE_ASS(exclude_callchain_kernel, "d", + attr->exclude_callchain_kernel); + WRITE_ASS(exclude_callchain_user, "d", + attr->exclude_callchain_user); + WRITE_ASS(wakeup_events, PRIu32, attr->wakeup_events); + WRITE_ASS(bp_type, PRIu32, attr->bp_type); + WRITE_ASS(config1, "llu", attr->config1); + WRITE_ASS(config2, "llu", attr->config2); + WRITE_ASS(branch_sample_type, "llu", attr->branch_sample_type); + WRITE_ASS(sample_regs_user, "llu", attr->sample_regs_user); + WRITE_ASS(sample_stack_user, PRIu32, attr->sample_stack_user); + WRITE_ASS(optional, "d", 0); + + 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; +} |