mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-25 23:55:36 +07:00
3834966538
The function can return negative value, assigning it to unsigned variable can cause memory corruption. The problem has been detected using proposed semantic patch scripts/coccinelle/tests/unsigned_lesser_than_zero.cocci [1]. [1]: http://permalink.gmane.org/gmane.linux.kernel/2038576 Signed-off-by: Andrzej Hajda <a.hajda@samsung.com> Cc: Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com> Cc: Marek Szyprowski <m.szyprowski@samsung.com> Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: kernel-janitors@vger.kernel.org Link: http://lkml.kernel.org/r/1444122017-16856-1-git-send-email-a.hajda@samsung.com Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
1108 lines
28 KiB
C
1108 lines
28 KiB
C
#include <linux/types.h>
|
|
#include <sys/mman.h>
|
|
#include "event.h"
|
|
#include "debug.h"
|
|
#include "hist.h"
|
|
#include "machine.h"
|
|
#include "sort.h"
|
|
#include "string.h"
|
|
#include "strlist.h"
|
|
#include "thread.h"
|
|
#include "thread_map.h"
|
|
#include "symbol/kallsyms.h"
|
|
|
|
static const char *perf_event__names[] = {
|
|
[0] = "TOTAL",
|
|
[PERF_RECORD_MMAP] = "MMAP",
|
|
[PERF_RECORD_MMAP2] = "MMAP2",
|
|
[PERF_RECORD_LOST] = "LOST",
|
|
[PERF_RECORD_COMM] = "COMM",
|
|
[PERF_RECORD_EXIT] = "EXIT",
|
|
[PERF_RECORD_THROTTLE] = "THROTTLE",
|
|
[PERF_RECORD_UNTHROTTLE] = "UNTHROTTLE",
|
|
[PERF_RECORD_FORK] = "FORK",
|
|
[PERF_RECORD_READ] = "READ",
|
|
[PERF_RECORD_SAMPLE] = "SAMPLE",
|
|
[PERF_RECORD_AUX] = "AUX",
|
|
[PERF_RECORD_ITRACE_START] = "ITRACE_START",
|
|
[PERF_RECORD_LOST_SAMPLES] = "LOST_SAMPLES",
|
|
[PERF_RECORD_SWITCH] = "SWITCH",
|
|
[PERF_RECORD_SWITCH_CPU_WIDE] = "SWITCH_CPU_WIDE",
|
|
[PERF_RECORD_HEADER_ATTR] = "ATTR",
|
|
[PERF_RECORD_HEADER_EVENT_TYPE] = "EVENT_TYPE",
|
|
[PERF_RECORD_HEADER_TRACING_DATA] = "TRACING_DATA",
|
|
[PERF_RECORD_HEADER_BUILD_ID] = "BUILD_ID",
|
|
[PERF_RECORD_FINISHED_ROUND] = "FINISHED_ROUND",
|
|
[PERF_RECORD_ID_INDEX] = "ID_INDEX",
|
|
[PERF_RECORD_AUXTRACE_INFO] = "AUXTRACE_INFO",
|
|
[PERF_RECORD_AUXTRACE] = "AUXTRACE",
|
|
[PERF_RECORD_AUXTRACE_ERROR] = "AUXTRACE_ERROR",
|
|
};
|
|
|
|
const char *perf_event__name(unsigned int id)
|
|
{
|
|
if (id >= ARRAY_SIZE(perf_event__names))
|
|
return "INVALID";
|
|
if (!perf_event__names[id])
|
|
return "UNKNOWN";
|
|
return perf_event__names[id];
|
|
}
|
|
|
|
static struct perf_sample synth_sample = {
|
|
.pid = -1,
|
|
.tid = -1,
|
|
.time = -1,
|
|
.stream_id = -1,
|
|
.cpu = -1,
|
|
.period = 1,
|
|
};
|
|
|
|
/*
|
|
* Assumes that the first 4095 bytes of /proc/pid/stat contains
|
|
* the comm, tgid and ppid.
|
|
*/
|
|
static int perf_event__get_comm_ids(pid_t pid, char *comm, size_t len,
|
|
pid_t *tgid, pid_t *ppid)
|
|
{
|
|
char filename[PATH_MAX];
|
|
char bf[4096];
|
|
int fd;
|
|
size_t size = 0;
|
|
ssize_t n;
|
|
char *nl, *name, *tgids, *ppids;
|
|
|
|
*tgid = -1;
|
|
*ppid = -1;
|
|
|
|
snprintf(filename, sizeof(filename), "/proc/%d/status", pid);
|
|
|
|
fd = open(filename, O_RDONLY);
|
|
if (fd < 0) {
|
|
pr_debug("couldn't open %s\n", filename);
|
|
return -1;
|
|
}
|
|
|
|
n = read(fd, bf, sizeof(bf) - 1);
|
|
close(fd);
|
|
if (n <= 0) {
|
|
pr_warning("Couldn't get COMM, tigd and ppid for pid %d\n",
|
|
pid);
|
|
return -1;
|
|
}
|
|
bf[n] = '\0';
|
|
|
|
name = strstr(bf, "Name:");
|
|
tgids = strstr(bf, "Tgid:");
|
|
ppids = strstr(bf, "PPid:");
|
|
|
|
if (name) {
|
|
name += 5; /* strlen("Name:") */
|
|
|
|
while (*name && isspace(*name))
|
|
++name;
|
|
|
|
nl = strchr(name, '\n');
|
|
if (nl)
|
|
*nl = '\0';
|
|
|
|
size = strlen(name);
|
|
if (size >= len)
|
|
size = len - 1;
|
|
memcpy(comm, name, size);
|
|
comm[size] = '\0';
|
|
} else {
|
|
pr_debug("Name: string not found for pid %d\n", pid);
|
|
}
|
|
|
|
if (tgids) {
|
|
tgids += 5; /* strlen("Tgid:") */
|
|
*tgid = atoi(tgids);
|
|
} else {
|
|
pr_debug("Tgid: string not found for pid %d\n", pid);
|
|
}
|
|
|
|
if (ppids) {
|
|
ppids += 5; /* strlen("PPid:") */
|
|
*ppid = atoi(ppids);
|
|
} else {
|
|
pr_debug("PPid: string not found for pid %d\n", pid);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int perf_event__prepare_comm(union perf_event *event, pid_t pid,
|
|
struct machine *machine,
|
|
pid_t *tgid, pid_t *ppid)
|
|
{
|
|
size_t size;
|
|
|
|
*ppid = -1;
|
|
|
|
memset(&event->comm, 0, sizeof(event->comm));
|
|
|
|
if (machine__is_host(machine)) {
|
|
if (perf_event__get_comm_ids(pid, event->comm.comm,
|
|
sizeof(event->comm.comm),
|
|
tgid, ppid) != 0) {
|
|
return -1;
|
|
}
|
|
} else {
|
|
*tgid = machine->pid;
|
|
}
|
|
|
|
if (*tgid < 0)
|
|
return -1;
|
|
|
|
event->comm.pid = *tgid;
|
|
event->comm.header.type = PERF_RECORD_COMM;
|
|
|
|
size = strlen(event->comm.comm) + 1;
|
|
size = PERF_ALIGN(size, sizeof(u64));
|
|
memset(event->comm.comm + size, 0, machine->id_hdr_size);
|
|
event->comm.header.size = (sizeof(event->comm) -
|
|
(sizeof(event->comm.comm) - size) +
|
|
machine->id_hdr_size);
|
|
event->comm.tid = pid;
|
|
|
|
return 0;
|
|
}
|
|
|
|
pid_t perf_event__synthesize_comm(struct perf_tool *tool,
|
|
union perf_event *event, pid_t pid,
|
|
perf_event__handler_t process,
|
|
struct machine *machine)
|
|
{
|
|
pid_t tgid, ppid;
|
|
|
|
if (perf_event__prepare_comm(event, pid, machine, &tgid, &ppid) != 0)
|
|
return -1;
|
|
|
|
if (process(tool, event, &synth_sample, machine) != 0)
|
|
return -1;
|
|
|
|
return tgid;
|
|
}
|
|
|
|
static int perf_event__synthesize_fork(struct perf_tool *tool,
|
|
union perf_event *event,
|
|
pid_t pid, pid_t tgid, pid_t ppid,
|
|
perf_event__handler_t process,
|
|
struct machine *machine)
|
|
{
|
|
memset(&event->fork, 0, sizeof(event->fork) + machine->id_hdr_size);
|
|
|
|
/*
|
|
* for main thread set parent to ppid from status file. For other
|
|
* threads set parent pid to main thread. ie., assume main thread
|
|
* spawns all threads in a process
|
|
*/
|
|
if (tgid == pid) {
|
|
event->fork.ppid = ppid;
|
|
event->fork.ptid = ppid;
|
|
} else {
|
|
event->fork.ppid = tgid;
|
|
event->fork.ptid = tgid;
|
|
}
|
|
event->fork.pid = tgid;
|
|
event->fork.tid = pid;
|
|
event->fork.header.type = PERF_RECORD_FORK;
|
|
|
|
event->fork.header.size = (sizeof(event->fork) + machine->id_hdr_size);
|
|
|
|
if (process(tool, event, &synth_sample, machine) != 0)
|
|
return -1;
|
|
|
|
return 0;
|
|
}
|
|
|
|
int perf_event__synthesize_mmap_events(struct perf_tool *tool,
|
|
union perf_event *event,
|
|
pid_t pid, pid_t tgid,
|
|
perf_event__handler_t process,
|
|
struct machine *machine,
|
|
bool mmap_data,
|
|
unsigned int proc_map_timeout)
|
|
{
|
|
char filename[PATH_MAX];
|
|
FILE *fp;
|
|
unsigned long long t;
|
|
bool truncation = false;
|
|
unsigned long long timeout = proc_map_timeout * 1000000ULL;
|
|
int rc = 0;
|
|
|
|
if (machine__is_default_guest(machine))
|
|
return 0;
|
|
|
|
snprintf(filename, sizeof(filename), "%s/proc/%d/maps",
|
|
machine->root_dir, pid);
|
|
|
|
fp = fopen(filename, "r");
|
|
if (fp == NULL) {
|
|
/*
|
|
* We raced with a task exiting - just return:
|
|
*/
|
|
pr_debug("couldn't open %s\n", filename);
|
|
return -1;
|
|
}
|
|
|
|
event->header.type = PERF_RECORD_MMAP2;
|
|
t = rdclock();
|
|
|
|
while (1) {
|
|
char bf[BUFSIZ];
|
|
char prot[5];
|
|
char execname[PATH_MAX];
|
|
char anonstr[] = "//anon";
|
|
unsigned int ino;
|
|
size_t size;
|
|
ssize_t n;
|
|
|
|
if (fgets(bf, sizeof(bf), fp) == NULL)
|
|
break;
|
|
|
|
if ((rdclock() - t) > timeout) {
|
|
pr_warning("Reading %s time out. "
|
|
"You may want to increase "
|
|
"the time limit by --proc-map-timeout\n",
|
|
filename);
|
|
truncation = true;
|
|
goto out;
|
|
}
|
|
|
|
/* ensure null termination since stack will be reused. */
|
|
strcpy(execname, "");
|
|
|
|
/* 00400000-0040c000 r-xp 00000000 fd:01 41038 /bin/cat */
|
|
n = sscanf(bf, "%"PRIx64"-%"PRIx64" %s %"PRIx64" %x:%x %u %s\n",
|
|
&event->mmap2.start, &event->mmap2.len, prot,
|
|
&event->mmap2.pgoff, &event->mmap2.maj,
|
|
&event->mmap2.min,
|
|
&ino, execname);
|
|
|
|
/*
|
|
* Anon maps don't have the execname.
|
|
*/
|
|
if (n < 7)
|
|
continue;
|
|
|
|
event->mmap2.ino = (u64)ino;
|
|
|
|
/*
|
|
* Just like the kernel, see __perf_event_mmap in kernel/perf_event.c
|
|
*/
|
|
if (machine__is_host(machine))
|
|
event->header.misc = PERF_RECORD_MISC_USER;
|
|
else
|
|
event->header.misc = PERF_RECORD_MISC_GUEST_USER;
|
|
|
|
/* map protection and flags bits */
|
|
event->mmap2.prot = 0;
|
|
event->mmap2.flags = 0;
|
|
if (prot[0] == 'r')
|
|
event->mmap2.prot |= PROT_READ;
|
|
if (prot[1] == 'w')
|
|
event->mmap2.prot |= PROT_WRITE;
|
|
if (prot[2] == 'x')
|
|
event->mmap2.prot |= PROT_EXEC;
|
|
|
|
if (prot[3] == 's')
|
|
event->mmap2.flags |= MAP_SHARED;
|
|
else
|
|
event->mmap2.flags |= MAP_PRIVATE;
|
|
|
|
if (prot[2] != 'x') {
|
|
if (!mmap_data || prot[0] != 'r')
|
|
continue;
|
|
|
|
event->header.misc |= PERF_RECORD_MISC_MMAP_DATA;
|
|
}
|
|
|
|
out:
|
|
if (truncation)
|
|
event->header.misc |= PERF_RECORD_MISC_PROC_MAP_PARSE_TIMEOUT;
|
|
|
|
if (!strcmp(execname, ""))
|
|
strcpy(execname, anonstr);
|
|
|
|
size = strlen(execname) + 1;
|
|
memcpy(event->mmap2.filename, execname, size);
|
|
size = PERF_ALIGN(size, sizeof(u64));
|
|
event->mmap2.len -= event->mmap.start;
|
|
event->mmap2.header.size = (sizeof(event->mmap2) -
|
|
(sizeof(event->mmap2.filename) - size));
|
|
memset(event->mmap2.filename + size, 0, machine->id_hdr_size);
|
|
event->mmap2.header.size += machine->id_hdr_size;
|
|
event->mmap2.pid = tgid;
|
|
event->mmap2.tid = pid;
|
|
|
|
if (process(tool, event, &synth_sample, machine) != 0) {
|
|
rc = -1;
|
|
break;
|
|
}
|
|
|
|
if (truncation)
|
|
break;
|
|
}
|
|
|
|
fclose(fp);
|
|
return rc;
|
|
}
|
|
|
|
int perf_event__synthesize_modules(struct perf_tool *tool,
|
|
perf_event__handler_t process,
|
|
struct machine *machine)
|
|
{
|
|
int rc = 0;
|
|
struct map *pos;
|
|
struct map_groups *kmaps = &machine->kmaps;
|
|
struct maps *maps = &kmaps->maps[MAP__FUNCTION];
|
|
union perf_event *event = zalloc((sizeof(event->mmap) +
|
|
machine->id_hdr_size));
|
|
if (event == NULL) {
|
|
pr_debug("Not enough memory synthesizing mmap event "
|
|
"for kernel modules\n");
|
|
return -1;
|
|
}
|
|
|
|
event->header.type = PERF_RECORD_MMAP;
|
|
|
|
/*
|
|
* kernel uses 0 for user space maps, see kernel/perf_event.c
|
|
* __perf_event_mmap
|
|
*/
|
|
if (machine__is_host(machine))
|
|
event->header.misc = PERF_RECORD_MISC_KERNEL;
|
|
else
|
|
event->header.misc = PERF_RECORD_MISC_GUEST_KERNEL;
|
|
|
|
for (pos = maps__first(maps); pos; pos = map__next(pos)) {
|
|
size_t size;
|
|
|
|
if (__map__is_kernel(pos))
|
|
continue;
|
|
|
|
size = PERF_ALIGN(pos->dso->long_name_len + 1, sizeof(u64));
|
|
event->mmap.header.type = PERF_RECORD_MMAP;
|
|
event->mmap.header.size = (sizeof(event->mmap) -
|
|
(sizeof(event->mmap.filename) - size));
|
|
memset(event->mmap.filename + size, 0, machine->id_hdr_size);
|
|
event->mmap.header.size += machine->id_hdr_size;
|
|
event->mmap.start = pos->start;
|
|
event->mmap.len = pos->end - pos->start;
|
|
event->mmap.pid = machine->pid;
|
|
|
|
memcpy(event->mmap.filename, pos->dso->long_name,
|
|
pos->dso->long_name_len + 1);
|
|
if (process(tool, event, &synth_sample, machine) != 0) {
|
|
rc = -1;
|
|
break;
|
|
}
|
|
}
|
|
|
|
free(event);
|
|
return rc;
|
|
}
|
|
|
|
static int __event__synthesize_thread(union perf_event *comm_event,
|
|
union perf_event *mmap_event,
|
|
union perf_event *fork_event,
|
|
pid_t pid, int full,
|
|
perf_event__handler_t process,
|
|
struct perf_tool *tool,
|
|
struct machine *machine,
|
|
bool mmap_data,
|
|
unsigned int proc_map_timeout)
|
|
{
|
|
char filename[PATH_MAX];
|
|
DIR *tasks;
|
|
struct dirent dirent, *next;
|
|
pid_t tgid, ppid;
|
|
int rc = 0;
|
|
|
|
/* special case: only send one comm event using passed in pid */
|
|
if (!full) {
|
|
tgid = perf_event__synthesize_comm(tool, comm_event, pid,
|
|
process, machine);
|
|
|
|
if (tgid == -1)
|
|
return -1;
|
|
|
|
return perf_event__synthesize_mmap_events(tool, mmap_event, pid, tgid,
|
|
process, machine, mmap_data,
|
|
proc_map_timeout);
|
|
}
|
|
|
|
if (machine__is_default_guest(machine))
|
|
return 0;
|
|
|
|
snprintf(filename, sizeof(filename), "%s/proc/%d/task",
|
|
machine->root_dir, pid);
|
|
|
|
tasks = opendir(filename);
|
|
if (tasks == NULL) {
|
|
pr_debug("couldn't open %s\n", filename);
|
|
return 0;
|
|
}
|
|
|
|
while (!readdir_r(tasks, &dirent, &next) && next) {
|
|
char *end;
|
|
pid_t _pid;
|
|
|
|
_pid = strtol(dirent.d_name, &end, 10);
|
|
if (*end)
|
|
continue;
|
|
|
|
rc = -1;
|
|
if (perf_event__prepare_comm(comm_event, _pid, machine,
|
|
&tgid, &ppid) != 0)
|
|
break;
|
|
|
|
if (perf_event__synthesize_fork(tool, fork_event, _pid, tgid,
|
|
ppid, process, machine) < 0)
|
|
break;
|
|
/*
|
|
* Send the prepared comm event
|
|
*/
|
|
if (process(tool, comm_event, &synth_sample, machine) != 0)
|
|
break;
|
|
|
|
rc = 0;
|
|
if (_pid == pid) {
|
|
/* process the parent's maps too */
|
|
rc = perf_event__synthesize_mmap_events(tool, mmap_event, pid, tgid,
|
|
process, machine, mmap_data, proc_map_timeout);
|
|
if (rc)
|
|
break;
|
|
}
|
|
}
|
|
|
|
closedir(tasks);
|
|
return rc;
|
|
}
|
|
|
|
int perf_event__synthesize_thread_map(struct perf_tool *tool,
|
|
struct thread_map *threads,
|
|
perf_event__handler_t process,
|
|
struct machine *machine,
|
|
bool mmap_data,
|
|
unsigned int proc_map_timeout)
|
|
{
|
|
union perf_event *comm_event, *mmap_event, *fork_event;
|
|
int err = -1, thread, j;
|
|
|
|
comm_event = malloc(sizeof(comm_event->comm) + machine->id_hdr_size);
|
|
if (comm_event == NULL)
|
|
goto out;
|
|
|
|
mmap_event = malloc(sizeof(mmap_event->mmap) + machine->id_hdr_size);
|
|
if (mmap_event == NULL)
|
|
goto out_free_comm;
|
|
|
|
fork_event = malloc(sizeof(fork_event->fork) + machine->id_hdr_size);
|
|
if (fork_event == NULL)
|
|
goto out_free_mmap;
|
|
|
|
err = 0;
|
|
for (thread = 0; thread < threads->nr; ++thread) {
|
|
if (__event__synthesize_thread(comm_event, mmap_event,
|
|
fork_event,
|
|
thread_map__pid(threads, thread), 0,
|
|
process, tool, machine,
|
|
mmap_data, proc_map_timeout)) {
|
|
err = -1;
|
|
break;
|
|
}
|
|
|
|
/*
|
|
* comm.pid is set to thread group id by
|
|
* perf_event__synthesize_comm
|
|
*/
|
|
if ((int) comm_event->comm.pid != thread_map__pid(threads, thread)) {
|
|
bool need_leader = true;
|
|
|
|
/* is thread group leader in thread_map? */
|
|
for (j = 0; j < threads->nr; ++j) {
|
|
if ((int) comm_event->comm.pid == thread_map__pid(threads, j)) {
|
|
need_leader = false;
|
|
break;
|
|
}
|
|
}
|
|
|
|
/* if not, generate events for it */
|
|
if (need_leader &&
|
|
__event__synthesize_thread(comm_event, mmap_event,
|
|
fork_event,
|
|
comm_event->comm.pid, 0,
|
|
process, tool, machine,
|
|
mmap_data, proc_map_timeout)) {
|
|
err = -1;
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
free(fork_event);
|
|
out_free_mmap:
|
|
free(mmap_event);
|
|
out_free_comm:
|
|
free(comm_event);
|
|
out:
|
|
return err;
|
|
}
|
|
|
|
int perf_event__synthesize_threads(struct perf_tool *tool,
|
|
perf_event__handler_t process,
|
|
struct machine *machine,
|
|
bool mmap_data,
|
|
unsigned int proc_map_timeout)
|
|
{
|
|
DIR *proc;
|
|
char proc_path[PATH_MAX];
|
|
struct dirent dirent, *next;
|
|
union perf_event *comm_event, *mmap_event, *fork_event;
|
|
int err = -1;
|
|
|
|
if (machine__is_default_guest(machine))
|
|
return 0;
|
|
|
|
comm_event = malloc(sizeof(comm_event->comm) + machine->id_hdr_size);
|
|
if (comm_event == NULL)
|
|
goto out;
|
|
|
|
mmap_event = malloc(sizeof(mmap_event->mmap) + machine->id_hdr_size);
|
|
if (mmap_event == NULL)
|
|
goto out_free_comm;
|
|
|
|
fork_event = malloc(sizeof(fork_event->fork) + machine->id_hdr_size);
|
|
if (fork_event == NULL)
|
|
goto out_free_mmap;
|
|
|
|
snprintf(proc_path, sizeof(proc_path), "%s/proc", machine->root_dir);
|
|
proc = opendir(proc_path);
|
|
|
|
if (proc == NULL)
|
|
goto out_free_fork;
|
|
|
|
while (!readdir_r(proc, &dirent, &next) && next) {
|
|
char *end;
|
|
pid_t pid = strtol(dirent.d_name, &end, 10);
|
|
|
|
if (*end) /* only interested in proper numerical dirents */
|
|
continue;
|
|
/*
|
|
* We may race with exiting thread, so don't stop just because
|
|
* one thread couldn't be synthesized.
|
|
*/
|
|
__event__synthesize_thread(comm_event, mmap_event, fork_event, pid,
|
|
1, process, tool, machine, mmap_data,
|
|
proc_map_timeout);
|
|
}
|
|
|
|
err = 0;
|
|
closedir(proc);
|
|
out_free_fork:
|
|
free(fork_event);
|
|
out_free_mmap:
|
|
free(mmap_event);
|
|
out_free_comm:
|
|
free(comm_event);
|
|
out:
|
|
return err;
|
|
}
|
|
|
|
struct process_symbol_args {
|
|
const char *name;
|
|
u64 start;
|
|
};
|
|
|
|
static int find_symbol_cb(void *arg, const char *name, char type,
|
|
u64 start)
|
|
{
|
|
struct process_symbol_args *args = arg;
|
|
|
|
/*
|
|
* Must be a function or at least an alias, as in PARISC64, where "_text" is
|
|
* an 'A' to the same address as "_stext".
|
|
*/
|
|
if (!(symbol_type__is_a(type, MAP__FUNCTION) ||
|
|
type == 'A') || strcmp(name, args->name))
|
|
return 0;
|
|
|
|
args->start = start;
|
|
return 1;
|
|
}
|
|
|
|
u64 kallsyms__get_function_start(const char *kallsyms_filename,
|
|
const char *symbol_name)
|
|
{
|
|
struct process_symbol_args args = { .name = symbol_name, };
|
|
|
|
if (kallsyms__parse(kallsyms_filename, &args, find_symbol_cb) <= 0)
|
|
return 0;
|
|
|
|
return args.start;
|
|
}
|
|
|
|
int perf_event__synthesize_kernel_mmap(struct perf_tool *tool,
|
|
perf_event__handler_t process,
|
|
struct machine *machine)
|
|
{
|
|
size_t size;
|
|
const char *mmap_name;
|
|
char name_buff[PATH_MAX];
|
|
struct map *map = machine__kernel_map(machine);
|
|
struct kmap *kmap;
|
|
int err;
|
|
union perf_event *event;
|
|
|
|
if (map == NULL)
|
|
return -1;
|
|
|
|
/*
|
|
* We should get this from /sys/kernel/sections/.text, but till that is
|
|
* available use this, and after it is use this as a fallback for older
|
|
* kernels.
|
|
*/
|
|
event = zalloc((sizeof(event->mmap) + machine->id_hdr_size));
|
|
if (event == NULL) {
|
|
pr_debug("Not enough memory synthesizing mmap event "
|
|
"for kernel modules\n");
|
|
return -1;
|
|
}
|
|
|
|
mmap_name = machine__mmap_name(machine, name_buff, sizeof(name_buff));
|
|
if (machine__is_host(machine)) {
|
|
/*
|
|
* kernel uses PERF_RECORD_MISC_USER for user space maps,
|
|
* see kernel/perf_event.c __perf_event_mmap
|
|
*/
|
|
event->header.misc = PERF_RECORD_MISC_KERNEL;
|
|
} else {
|
|
event->header.misc = PERF_RECORD_MISC_GUEST_KERNEL;
|
|
}
|
|
|
|
kmap = map__kmap(map);
|
|
size = snprintf(event->mmap.filename, sizeof(event->mmap.filename),
|
|
"%s%s", mmap_name, kmap->ref_reloc_sym->name) + 1;
|
|
size = PERF_ALIGN(size, sizeof(u64));
|
|
event->mmap.header.type = PERF_RECORD_MMAP;
|
|
event->mmap.header.size = (sizeof(event->mmap) -
|
|
(sizeof(event->mmap.filename) - size) + machine->id_hdr_size);
|
|
event->mmap.pgoff = kmap->ref_reloc_sym->addr;
|
|
event->mmap.start = map->start;
|
|
event->mmap.len = map->end - event->mmap.start;
|
|
event->mmap.pid = machine->pid;
|
|
|
|
err = process(tool, event, &synth_sample, machine);
|
|
free(event);
|
|
|
|
return err;
|
|
}
|
|
|
|
size_t perf_event__fprintf_comm(union perf_event *event, FILE *fp)
|
|
{
|
|
const char *s;
|
|
|
|
if (event->header.misc & PERF_RECORD_MISC_COMM_EXEC)
|
|
s = " exec";
|
|
else
|
|
s = "";
|
|
|
|
return fprintf(fp, "%s: %s:%d/%d\n", s, event->comm.comm, event->comm.pid, event->comm.tid);
|
|
}
|
|
|
|
int perf_event__process_comm(struct perf_tool *tool __maybe_unused,
|
|
union perf_event *event,
|
|
struct perf_sample *sample,
|
|
struct machine *machine)
|
|
{
|
|
return machine__process_comm_event(machine, event, sample);
|
|
}
|
|
|
|
int perf_event__process_lost(struct perf_tool *tool __maybe_unused,
|
|
union perf_event *event,
|
|
struct perf_sample *sample,
|
|
struct machine *machine)
|
|
{
|
|
return machine__process_lost_event(machine, event, sample);
|
|
}
|
|
|
|
int perf_event__process_aux(struct perf_tool *tool __maybe_unused,
|
|
union perf_event *event,
|
|
struct perf_sample *sample __maybe_unused,
|
|
struct machine *machine)
|
|
{
|
|
return machine__process_aux_event(machine, event);
|
|
}
|
|
|
|
int perf_event__process_itrace_start(struct perf_tool *tool __maybe_unused,
|
|
union perf_event *event,
|
|
struct perf_sample *sample __maybe_unused,
|
|
struct machine *machine)
|
|
{
|
|
return machine__process_itrace_start_event(machine, event);
|
|
}
|
|
|
|
int perf_event__process_lost_samples(struct perf_tool *tool __maybe_unused,
|
|
union perf_event *event,
|
|
struct perf_sample *sample,
|
|
struct machine *machine)
|
|
{
|
|
return machine__process_lost_samples_event(machine, event, sample);
|
|
}
|
|
|
|
int perf_event__process_switch(struct perf_tool *tool __maybe_unused,
|
|
union perf_event *event,
|
|
struct perf_sample *sample __maybe_unused,
|
|
struct machine *machine)
|
|
{
|
|
return machine__process_switch_event(machine, event);
|
|
}
|
|
|
|
size_t perf_event__fprintf_mmap(union perf_event *event, FILE *fp)
|
|
{
|
|
return fprintf(fp, " %d/%d: [%#" PRIx64 "(%#" PRIx64 ") @ %#" PRIx64 "]: %c %s\n",
|
|
event->mmap.pid, event->mmap.tid, event->mmap.start,
|
|
event->mmap.len, event->mmap.pgoff,
|
|
(event->header.misc & PERF_RECORD_MISC_MMAP_DATA) ? 'r' : 'x',
|
|
event->mmap.filename);
|
|
}
|
|
|
|
size_t perf_event__fprintf_mmap2(union perf_event *event, FILE *fp)
|
|
{
|
|
return fprintf(fp, " %d/%d: [%#" PRIx64 "(%#" PRIx64 ") @ %#" PRIx64
|
|
" %02x:%02x %"PRIu64" %"PRIu64"]: %c%c%c%c %s\n",
|
|
event->mmap2.pid, event->mmap2.tid, event->mmap2.start,
|
|
event->mmap2.len, event->mmap2.pgoff, event->mmap2.maj,
|
|
event->mmap2.min, event->mmap2.ino,
|
|
event->mmap2.ino_generation,
|
|
(event->mmap2.prot & PROT_READ) ? 'r' : '-',
|
|
(event->mmap2.prot & PROT_WRITE) ? 'w' : '-',
|
|
(event->mmap2.prot & PROT_EXEC) ? 'x' : '-',
|
|
(event->mmap2.flags & MAP_SHARED) ? 's' : 'p',
|
|
event->mmap2.filename);
|
|
}
|
|
|
|
int perf_event__process_mmap(struct perf_tool *tool __maybe_unused,
|
|
union perf_event *event,
|
|
struct perf_sample *sample,
|
|
struct machine *machine)
|
|
{
|
|
return machine__process_mmap_event(machine, event, sample);
|
|
}
|
|
|
|
int perf_event__process_mmap2(struct perf_tool *tool __maybe_unused,
|
|
union perf_event *event,
|
|
struct perf_sample *sample,
|
|
struct machine *machine)
|
|
{
|
|
return machine__process_mmap2_event(machine, event, sample);
|
|
}
|
|
|
|
size_t perf_event__fprintf_task(union perf_event *event, FILE *fp)
|
|
{
|
|
return fprintf(fp, "(%d:%d):(%d:%d)\n",
|
|
event->fork.pid, event->fork.tid,
|
|
event->fork.ppid, event->fork.ptid);
|
|
}
|
|
|
|
int perf_event__process_fork(struct perf_tool *tool __maybe_unused,
|
|
union perf_event *event,
|
|
struct perf_sample *sample,
|
|
struct machine *machine)
|
|
{
|
|
return machine__process_fork_event(machine, event, sample);
|
|
}
|
|
|
|
int perf_event__process_exit(struct perf_tool *tool __maybe_unused,
|
|
union perf_event *event,
|
|
struct perf_sample *sample,
|
|
struct machine *machine)
|
|
{
|
|
return machine__process_exit_event(machine, event, sample);
|
|
}
|
|
|
|
size_t perf_event__fprintf_aux(union perf_event *event, FILE *fp)
|
|
{
|
|
return fprintf(fp, " offset: %#"PRIx64" size: %#"PRIx64" flags: %#"PRIx64" [%s%s]\n",
|
|
event->aux.aux_offset, event->aux.aux_size,
|
|
event->aux.flags,
|
|
event->aux.flags & PERF_AUX_FLAG_TRUNCATED ? "T" : "",
|
|
event->aux.flags & PERF_AUX_FLAG_OVERWRITE ? "O" : "");
|
|
}
|
|
|
|
size_t perf_event__fprintf_itrace_start(union perf_event *event, FILE *fp)
|
|
{
|
|
return fprintf(fp, " pid: %u tid: %u\n",
|
|
event->itrace_start.pid, event->itrace_start.tid);
|
|
}
|
|
|
|
size_t perf_event__fprintf_switch(union perf_event *event, FILE *fp)
|
|
{
|
|
bool out = event->header.misc & PERF_RECORD_MISC_SWITCH_OUT;
|
|
const char *in_out = out ? "OUT" : "IN ";
|
|
|
|
if (event->header.type == PERF_RECORD_SWITCH)
|
|
return fprintf(fp, " %s\n", in_out);
|
|
|
|
return fprintf(fp, " %s %s pid/tid: %5u/%-5u\n",
|
|
in_out, out ? "next" : "prev",
|
|
event->context_switch.next_prev_pid,
|
|
event->context_switch.next_prev_tid);
|
|
}
|
|
|
|
size_t perf_event__fprintf(union perf_event *event, FILE *fp)
|
|
{
|
|
size_t ret = fprintf(fp, "PERF_RECORD_%s",
|
|
perf_event__name(event->header.type));
|
|
|
|
switch (event->header.type) {
|
|
case PERF_RECORD_COMM:
|
|
ret += perf_event__fprintf_comm(event, fp);
|
|
break;
|
|
case PERF_RECORD_FORK:
|
|
case PERF_RECORD_EXIT:
|
|
ret += perf_event__fprintf_task(event, fp);
|
|
break;
|
|
case PERF_RECORD_MMAP:
|
|
ret += perf_event__fprintf_mmap(event, fp);
|
|
break;
|
|
case PERF_RECORD_MMAP2:
|
|
ret += perf_event__fprintf_mmap2(event, fp);
|
|
break;
|
|
case PERF_RECORD_AUX:
|
|
ret += perf_event__fprintf_aux(event, fp);
|
|
break;
|
|
case PERF_RECORD_ITRACE_START:
|
|
ret += perf_event__fprintf_itrace_start(event, fp);
|
|
break;
|
|
case PERF_RECORD_SWITCH:
|
|
case PERF_RECORD_SWITCH_CPU_WIDE:
|
|
ret += perf_event__fprintf_switch(event, fp);
|
|
break;
|
|
default:
|
|
ret += fprintf(fp, "\n");
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
int perf_event__process(struct perf_tool *tool __maybe_unused,
|
|
union perf_event *event,
|
|
struct perf_sample *sample,
|
|
struct machine *machine)
|
|
{
|
|
return machine__process_event(machine, event, sample);
|
|
}
|
|
|
|
void thread__find_addr_map(struct thread *thread, u8 cpumode,
|
|
enum map_type type, u64 addr,
|
|
struct addr_location *al)
|
|
{
|
|
struct map_groups *mg = thread->mg;
|
|
struct machine *machine = mg->machine;
|
|
bool load_map = false;
|
|
|
|
al->machine = machine;
|
|
al->thread = thread;
|
|
al->addr = addr;
|
|
al->cpumode = cpumode;
|
|
al->filtered = 0;
|
|
|
|
if (machine == NULL) {
|
|
al->map = NULL;
|
|
return;
|
|
}
|
|
|
|
if (cpumode == PERF_RECORD_MISC_KERNEL && perf_host) {
|
|
al->level = 'k';
|
|
mg = &machine->kmaps;
|
|
load_map = true;
|
|
} else if (cpumode == PERF_RECORD_MISC_USER && perf_host) {
|
|
al->level = '.';
|
|
} else if (cpumode == PERF_RECORD_MISC_GUEST_KERNEL && perf_guest) {
|
|
al->level = 'g';
|
|
mg = &machine->kmaps;
|
|
load_map = true;
|
|
} else if (cpumode == PERF_RECORD_MISC_GUEST_USER && perf_guest) {
|
|
al->level = 'u';
|
|
} else {
|
|
al->level = 'H';
|
|
al->map = NULL;
|
|
|
|
if ((cpumode == PERF_RECORD_MISC_GUEST_USER ||
|
|
cpumode == PERF_RECORD_MISC_GUEST_KERNEL) &&
|
|
!perf_guest)
|
|
al->filtered |= (1 << HIST_FILTER__GUEST);
|
|
if ((cpumode == PERF_RECORD_MISC_USER ||
|
|
cpumode == PERF_RECORD_MISC_KERNEL) &&
|
|
!perf_host)
|
|
al->filtered |= (1 << HIST_FILTER__HOST);
|
|
|
|
return;
|
|
}
|
|
try_again:
|
|
al->map = map_groups__find(mg, type, al->addr);
|
|
if (al->map == NULL) {
|
|
/*
|
|
* If this is outside of all known maps, and is a negative
|
|
* address, try to look it up in the kernel dso, as it might be
|
|
* a vsyscall or vdso (which executes in user-mode).
|
|
*
|
|
* XXX This is nasty, we should have a symbol list in the
|
|
* "[vdso]" dso, but for now lets use the old trick of looking
|
|
* in the whole kernel symbol list.
|
|
*/
|
|
if (cpumode == PERF_RECORD_MISC_USER && machine &&
|
|
mg != &machine->kmaps &&
|
|
machine__kernel_ip(machine, al->addr)) {
|
|
mg = &machine->kmaps;
|
|
load_map = true;
|
|
goto try_again;
|
|
}
|
|
} else {
|
|
/*
|
|
* Kernel maps might be changed when loading symbols so loading
|
|
* must be done prior to using kernel maps.
|
|
*/
|
|
if (load_map)
|
|
map__load(al->map, machine->symbol_filter);
|
|
al->addr = al->map->map_ip(al->map, al->addr);
|
|
}
|
|
}
|
|
|
|
void thread__find_addr_location(struct thread *thread,
|
|
u8 cpumode, enum map_type type, u64 addr,
|
|
struct addr_location *al)
|
|
{
|
|
thread__find_addr_map(thread, cpumode, type, addr, al);
|
|
if (al->map != NULL)
|
|
al->sym = map__find_symbol(al->map, al->addr,
|
|
thread->mg->machine->symbol_filter);
|
|
else
|
|
al->sym = NULL;
|
|
}
|
|
|
|
/*
|
|
* Callers need to drop the reference to al->thread, obtained in
|
|
* machine__findnew_thread()
|
|
*/
|
|
int perf_event__preprocess_sample(const union perf_event *event,
|
|
struct machine *machine,
|
|
struct addr_location *al,
|
|
struct perf_sample *sample)
|
|
{
|
|
u8 cpumode = event->header.misc & PERF_RECORD_MISC_CPUMODE_MASK;
|
|
struct thread *thread = machine__findnew_thread(machine, sample->pid,
|
|
sample->tid);
|
|
|
|
if (thread == NULL)
|
|
return -1;
|
|
|
|
dump_printf(" ... thread: %s:%d\n", thread__comm_str(thread), thread->tid);
|
|
/*
|
|
* Have we already created the kernel maps for this machine?
|
|
*
|
|
* This should have happened earlier, when we processed the kernel MMAP
|
|
* events, but for older perf.data files there was no such thing, so do
|
|
* it now.
|
|
*/
|
|
if (cpumode == PERF_RECORD_MISC_KERNEL &&
|
|
machine__kernel_map(machine) == NULL)
|
|
machine__create_kernel_maps(machine);
|
|
|
|
thread__find_addr_map(thread, cpumode, MAP__FUNCTION, sample->ip, al);
|
|
dump_printf(" ...... dso: %s\n",
|
|
al->map ? al->map->dso->long_name :
|
|
al->level == 'H' ? "[hypervisor]" : "<not found>");
|
|
|
|
if (thread__is_filtered(thread))
|
|
al->filtered |= (1 << HIST_FILTER__THREAD);
|
|
|
|
al->sym = NULL;
|
|
al->cpu = sample->cpu;
|
|
al->socket = -1;
|
|
|
|
if (al->cpu >= 0) {
|
|
struct perf_env *env = machine->env;
|
|
|
|
if (env && env->cpu)
|
|
al->socket = env->cpu[al->cpu].socket_id;
|
|
}
|
|
|
|
if (al->map) {
|
|
struct dso *dso = al->map->dso;
|
|
|
|
if (symbol_conf.dso_list &&
|
|
(!dso || !(strlist__has_entry(symbol_conf.dso_list,
|
|
dso->short_name) ||
|
|
(dso->short_name != dso->long_name &&
|
|
strlist__has_entry(symbol_conf.dso_list,
|
|
dso->long_name))))) {
|
|
al->filtered |= (1 << HIST_FILTER__DSO);
|
|
}
|
|
|
|
al->sym = map__find_symbol(al->map, al->addr,
|
|
machine->symbol_filter);
|
|
}
|
|
|
|
if (symbol_conf.sym_list &&
|
|
(!al->sym || !strlist__has_entry(symbol_conf.sym_list,
|
|
al->sym->name))) {
|
|
al->filtered |= (1 << HIST_FILTER__SYMBOL);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* The preprocess_sample method will return with reference counts for the
|
|
* in it, when done using (and perhaps getting ref counts if needing to
|
|
* keep a pointer to one of those entries) it must be paired with
|
|
* addr_location__put(), so that the refcounts can be decremented.
|
|
*/
|
|
void addr_location__put(struct addr_location *al)
|
|
{
|
|
thread__zput(al->thread);
|
|
}
|
|
|
|
bool is_bts_event(struct perf_event_attr *attr)
|
|
{
|
|
return attr->type == PERF_TYPE_HARDWARE &&
|
|
(attr->config & PERF_COUNT_HW_BRANCH_INSTRUCTIONS) &&
|
|
attr->sample_period == 1;
|
|
}
|
|
|
|
bool sample_addr_correlates_sym(struct perf_event_attr *attr)
|
|
{
|
|
if (attr->type == PERF_TYPE_SOFTWARE &&
|
|
(attr->config == PERF_COUNT_SW_PAGE_FAULTS ||
|
|
attr->config == PERF_COUNT_SW_PAGE_FAULTS_MIN ||
|
|
attr->config == PERF_COUNT_SW_PAGE_FAULTS_MAJ))
|
|
return true;
|
|
|
|
if (is_bts_event(attr))
|
|
return true;
|
|
|
|
return false;
|
|
}
|
|
|
|
void perf_event__preprocess_sample_addr(union perf_event *event,
|
|
struct perf_sample *sample,
|
|
struct thread *thread,
|
|
struct addr_location *al)
|
|
{
|
|
u8 cpumode = event->header.misc & PERF_RECORD_MISC_CPUMODE_MASK;
|
|
|
|
thread__find_addr_map(thread, cpumode, MAP__FUNCTION, sample->addr, al);
|
|
if (!al->map)
|
|
thread__find_addr_map(thread, cpumode, MAP__VARIABLE,
|
|
sample->addr, al);
|
|
|
|
al->cpu = sample->cpu;
|
|
al->sym = NULL;
|
|
|
|
if (al->map)
|
|
al->sym = map__find_symbol(al->map, al->addr, NULL);
|
|
}
|