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da8a58b56c
There are 2 problems wrt. cpu_topology_map on systems with sparse CPUs:
1. offline/absent CPUs will have their socket_id and core_id set to -1
which triggers:
"socket_id number is too big.You may need to upgrade the perf tool."
2. size of cpu_topology_map (perf_env.cpu[]) is allocated based on
_SC_NPROCESSORS_CONF, but can be indexed with CPU ids going above.
Users of perf_env.cpu[] are using CPU id as index. This can lead
to read beyond what was allocated:
==19991== Invalid read of size 4
==19991== at 0x490CEB: check_cpu_topology (topology.c:69)
==19991== by 0x490CEB: test_session_topology (topology.c:106)
...
For example:
_SC_NPROCESSORS_CONF == 16
available: 2 nodes (0-1)
node 0 cpus: 0 6 8 10 16 22 24 26
node 0 size: 12004 MB
node 0 free: 9470 MB
node 1 cpus: 1 7 9 11 23 25 27
node 1 size: 12093 MB
node 1 free: 9406 MB
node distances:
node 0 1
0: 10 20
1: 20 10
This patch changes HEADER_NRCPUS.nr_cpus_available from _SC_NPROCESSORS_CONF
to max_present_cpu and updates any user of cpu_topology_map to iterate
with nr_cpus_avail.
As a consequence HEADER_CPU_TOPOLOGY core_id and socket_id lists get longer,
but maintain compatibility with pre-patch state - index to cpu_topology_map is
CPU id.
perf test 36 -v
36: Session topology :
--- start ---
test child forked, pid 22211
templ file: /tmp/perf-test-gmdX5i
CPU 0, core 0, socket 0
CPU 1, core 0, socket 1
CPU 6, core 10, socket 0
CPU 7, core 10, socket 1
CPU 8, core 1, socket 0
CPU 9, core 1, socket 1
CPU 10, core 9, socket 0
CPU 11, core 9, socket 1
CPU 16, core 0, socket 0
CPU 22, core 10, socket 0
CPU 23, core 10, socket 1
CPU 24, core 1, socket 0
CPU 25, core 1, socket 1
CPU 26, core 9, socket 0
CPU 27, core 9, socket 1
test child finished with 0
---- end ----
Session topology: Ok
Signed-off-by: Jan Stancek <jstancek@redhat.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Masami Hiramatsu <mhiramat@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: http://lkml.kernel.org/r/d7c05c6445fca74a8442c2c73cfffd349c52c44f.1487146877.git.jstancek@redhat.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
117 lines
2.4 KiB
C
117 lines
2.4 KiB
C
#include <string.h>
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#include <stdlib.h>
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#include <stdio.h>
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#include "tests.h"
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#include "util.h"
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#include "session.h"
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#include "evlist.h"
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#include "debug.h"
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#define TEMPL "/tmp/perf-test-XXXXXX"
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#define DATA_SIZE 10
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static int get_temp(char *path)
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{
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int fd;
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strcpy(path, TEMPL);
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fd = mkstemp(path);
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if (fd < 0) {
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perror("mkstemp failed");
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return -1;
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}
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close(fd);
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return 0;
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}
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static int session_write_header(char *path)
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{
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struct perf_session *session;
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struct perf_data_file file = {
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.path = path,
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.mode = PERF_DATA_MODE_WRITE,
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};
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session = perf_session__new(&file, false, NULL);
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TEST_ASSERT_VAL("can't get session", session);
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session->evlist = perf_evlist__new_default();
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TEST_ASSERT_VAL("can't get evlist", session->evlist);
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perf_header__set_feat(&session->header, HEADER_CPU_TOPOLOGY);
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perf_header__set_feat(&session->header, HEADER_NRCPUS);
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session->header.data_size += DATA_SIZE;
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TEST_ASSERT_VAL("failed to write header",
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!perf_session__write_header(session, session->evlist, file.fd, true));
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perf_session__delete(session);
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return 0;
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}
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static int check_cpu_topology(char *path, struct cpu_map *map)
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{
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struct perf_session *session;
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struct perf_data_file file = {
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.path = path,
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.mode = PERF_DATA_MODE_READ,
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};
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int i;
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session = perf_session__new(&file, false, NULL);
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TEST_ASSERT_VAL("can't get session", session);
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for (i = 0; i < session->header.env.nr_cpus_avail; i++) {
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if (!cpu_map__has(map, i))
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continue;
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pr_debug("CPU %d, core %d, socket %d\n", i,
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session->header.env.cpu[i].core_id,
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session->header.env.cpu[i].socket_id);
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}
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for (i = 0; i < map->nr; i++) {
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TEST_ASSERT_VAL("Core ID doesn't match",
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(session->header.env.cpu[map->map[i]].core_id == (cpu_map__get_core(map, i, NULL) & 0xffff)));
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TEST_ASSERT_VAL("Socket ID doesn't match",
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(session->header.env.cpu[map->map[i]].socket_id == cpu_map__get_socket(map, i, NULL)));
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}
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perf_session__delete(session);
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return 0;
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}
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int test_session_topology(int subtest __maybe_unused)
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{
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char path[PATH_MAX];
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struct cpu_map *map;
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int ret = -1;
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TEST_ASSERT_VAL("can't get templ file", !get_temp(path));
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pr_debug("templ file: %s\n", path);
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if (session_write_header(path))
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goto free_path;
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map = cpu_map__new(NULL);
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if (map == NULL) {
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pr_debug("failed to get system cpumap\n");
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goto free_path;
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}
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if (check_cpu_topology(path, map))
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goto free_map;
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ret = 0;
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free_map:
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cpu_map__put(map);
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free_path:
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unlink(path);
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return ret;
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}
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