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Merge branch 'perf-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip

Browse source 
* 'perf-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip:
  perf evlist: Fix per thread mmap setup
  perf tools: Honour the cpu list parameter when also monitoring a thread list
  kprobes, x86: Disable irqs during optimized callback
This commit is contained in:
Linus Torvalds 2011-05-18 03:13:46 -07:00
commit 7f12b72bd8
7 changed files with 119 additions and 56 deletions
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5
arch/x86/kernel/kprobes.c
View file

@ -1183,12 +1183,13 @@ static void __kprobes optimized_callback(struct optimized_kprobe *op,
struct pt_regs *regs)
{
struct kprobe_ctlblk *kcb = get_kprobe_ctlblk();
unsigned long flags;
/* This is possible if op is under delayed unoptimizing */
if (kprobe_disabled(&op->kp))
return;
preempt_disable();
local_irq_save(flags);
if (kprobe_running()) {
kprobes_inc_nmissed_count(&op->kp);
} else {
@ -1207,7 +1208,7 @@ static void __kprobes optimized_callback(struct optimized_kprobe *op,
opt_pre_handler(&op->kp, regs);
__this_cpu_write(current_kprobe, NULL);
}
preempt_enable_no_resched();
local_irq_restore(flags);
}
static int __kprobes copy_optimized_instructions(u8 *dest, u8 *src)

2
tools/perf/builtin-record.c
View file

@ -427,7 +427,7 @@ static void mmap_read_all(void)
{
int i;
for (i = 0; i < evsel_list->cpus->nr; i++) {
for (i = 0; i < evsel_list->nr_mmaps; i++) {
if (evsel_list->mmap[i].base)
mmap_read(&evsel_list->mmap[i]);
}

2
tools/perf/builtin-test.c
View file

@ -549,7 +549,7 @@ static int test__basic_mmap(void)
++foo;
}
while ((event = perf_evlist__read_on_cpu(evlist, 0)) != NULL) {
while ((event = perf_evlist__mmap_read(evlist, 0)) != NULL) {
struct perf_sample sample;
if (event->header.type != PERF_RECORD_SAMPLE) {

8
tools/perf/builtin-top.c
View file

@ -801,12 +801,12 @@ static void perf_event__process_sample(const union perf_event *event,
}
}
static void perf_session__mmap_read_cpu(struct perf_session *self, int cpu)
static void perf_session__mmap_read_idx(struct perf_session *self, int idx)
{
struct perf_sample sample;
union perf_event *event;
while ((event = perf_evlist__read_on_cpu(top.evlist, cpu)) != NULL) {
while ((event = perf_evlist__mmap_read(top.evlist, idx)) != NULL) {
perf_session__parse_sample(self, event, &sample);
if (event->header.type == PERF_RECORD_SAMPLE)
@ -820,8 +820,8 @@ static void perf_session__mmap_read(struct perf_session *self)
{
int i;
for (i = 0; i < top.evlist->cpus->nr; i++)
perf_session__mmap_read_cpu(self, i);
for (i = 0; i < top.evlist->nr_mmaps; i++)
perf_session__mmap_read_idx(self, i);
}
static void start_counters(struct perf_evlist *evlist)

153
tools/perf/util/evlist.c
View file

@ -166,11 +166,11 @@ struct perf_evsel *perf_evlist__id2evsel(struct perf_evlist *evlist, u64 id)
return NULL;
}
union perf_event *perf_evlist__read_on_cpu(struct perf_evlist *evlist, int cpu)
union perf_event *perf_evlist__mmap_read(struct perf_evlist *evlist, int idx)
{
/* XXX Move this to perf.c, making it generally available */
unsigned int page_size = sysconf(_SC_PAGE_SIZE);
struct perf_mmap *md = &evlist->mmap[cpu];
struct perf_mmap *md = &evlist->mmap[idx];
unsigned int head = perf_mmap__read_head(md);
unsigned int old = md->prev;
unsigned char *data = md->base + page_size;
@ -235,31 +235,37 @@ union perf_event *perf_evlist__read_on_cpu(struct perf_evlist *evlist, int cpu)
void perf_evlist__munmap(struct perf_evlist *evlist)
{
int cpu;
int i;
for (cpu = 0; cpu < evlist->cpus->nr; cpu++) {
if (evlist->mmap[cpu].base != NULL) {
munmap(evlist->mmap[cpu].base, evlist->mmap_len);
evlist->mmap[cpu].base = NULL;
for (i = 0; i < evlist->nr_mmaps; i++) {
if (evlist->mmap[i].base != NULL) {
munmap(evlist->mmap[i].base, evlist->mmap_len);
evlist->mmap[i].base = NULL;
}
}
free(evlist->mmap);
evlist->mmap = NULL;
}
int perf_evlist__alloc_mmap(struct perf_evlist *evlist)
{
evlist->mmap = zalloc(evlist->cpus->nr * sizeof(struct perf_mmap));
evlist->nr_mmaps = evlist->cpus->nr;
if (evlist->cpus->map[0] == -1)
evlist->nr_mmaps = evlist->threads->nr;
evlist->mmap = zalloc(evlist->nr_mmaps * sizeof(struct perf_mmap));
return evlist->mmap != NULL ? 0 : -ENOMEM;
}
static int __perf_evlist__mmap(struct perf_evlist *evlist, struct perf_evsel *evsel,
int cpu, int prot, int mask, int fd)
int idx, int prot, int mask, int fd)
{
evlist->mmap[cpu].prev = 0;
evlist->mmap[cpu].mask = mask;
evlist->mmap[cpu].base = mmap(NULL, evlist->mmap_len, prot,
evlist->mmap[idx].prev = 0;
evlist->mmap[idx].mask = mask;
evlist->mmap[idx].base = mmap(NULL, evlist->mmap_len, prot,
MAP_SHARED, fd, 0);
if (evlist->mmap[cpu].base == MAP_FAILED) {
if (evlist->cpus->map[cpu] == -1 && evsel->attr.inherit)
if (evlist->mmap[idx].base == MAP_FAILED) {
if (evlist->cpus->map[idx] == -1 && evsel->attr.inherit)
ui__warning("Inherit is not allowed on per-task "
"events using mmap.\n");
return -1;
@ -269,6 +275,86 @@ static int __perf_evlist__mmap(struct perf_evlist *evlist, struct perf_evsel *ev
return 0;
}
static int perf_evlist__mmap_per_cpu(struct perf_evlist *evlist, int prot, int mask)
{
struct perf_evsel *evsel;
int cpu, thread;
for (cpu = 0; cpu < evlist->cpus->nr; cpu++) {
int output = -1;
for (thread = 0; thread < evlist->threads->nr; thread++) {
list_for_each_entry(evsel, &evlist->entries, node) {
int fd = FD(evsel, cpu, thread);
if (output == -1) {
output = fd;
if (__perf_evlist__mmap(evlist, evsel, cpu,
prot, mask, output) < 0)
goto out_unmap;
} else {
if (ioctl(fd, PERF_EVENT_IOC_SET_OUTPUT, output) != 0)
goto out_unmap;
}
if ((evsel->attr.read_format & PERF_FORMAT_ID) &&
perf_evlist__id_add_fd(evlist, evsel, cpu, thread, fd) < 0)
goto out_unmap;
}
}
}
return 0;
out_unmap:
for (cpu = 0; cpu < evlist->cpus->nr; cpu++) {
if (evlist->mmap[cpu].base != NULL) {
munmap(evlist->mmap[cpu].base, evlist->mmap_len);
evlist->mmap[cpu].base = NULL;
}
}
return -1;
}
static int perf_evlist__mmap_per_thread(struct perf_evlist *evlist, int prot, int mask)
{
struct perf_evsel *evsel;
int thread;
for (thread = 0; thread < evlist->threads->nr; thread++) {
int output = -1;
list_for_each_entry(evsel, &evlist->entries, node) {
int fd = FD(evsel, 0, thread);
if (output == -1) {
output = fd;
if (__perf_evlist__mmap(evlist, evsel, thread,
prot, mask, output) < 0)
goto out_unmap;
} else {
if (ioctl(fd, PERF_EVENT_IOC_SET_OUTPUT, output) != 0)
goto out_unmap;
}
if ((evsel->attr.read_format & PERF_FORMAT_ID) &&
perf_evlist__id_add_fd(evlist, evsel, 0, thread, fd) < 0)
goto out_unmap;
}
}
return 0;
out_unmap:
for (thread = 0; thread < evlist->threads->nr; thread++) {
if (evlist->mmap[thread].base != NULL) {
munmap(evlist->mmap[thread].base, evlist->mmap_len);
evlist->mmap[thread].base = NULL;
}
}
return -1;
}
/** perf_evlist__mmap - Create per cpu maps to receive events
*
* @evlist - list of events
@ -287,11 +373,11 @@ static int __perf_evlist__mmap(struct perf_evlist *evlist, struct perf_evsel *ev
int perf_evlist__mmap(struct perf_evlist *evlist, int pages, bool overwrite)
{
unsigned int page_size = sysconf(_SC_PAGE_SIZE);
int mask = pages * page_size - 1, cpu;
struct perf_evsel *first_evsel, *evsel;
int mask = pages * page_size - 1;
struct perf_evsel *evsel;
const struct cpu_map *cpus = evlist->cpus;
const struct thread_map *threads = evlist->threads;
int thread, prot = PROT_READ | (overwrite ? 0 : PROT_WRITE);
int prot = PROT_READ | (overwrite ? 0 : PROT_WRITE);
if (evlist->mmap == NULL && perf_evlist__alloc_mmap(evlist) < 0)
return -ENOMEM;
@ -301,43 +387,18 @@ int perf_evlist__mmap(struct perf_evlist *evlist, int pages, bool overwrite)
evlist->overwrite = overwrite;
evlist->mmap_len = (pages + 1) * page_size;
first_evsel = list_entry(evlist->entries.next, struct perf_evsel, node);
list_for_each_entry(evsel, &evlist->entries, node) {
if ((evsel->attr.read_format & PERF_FORMAT_ID) &&
evsel->sample_id == NULL &&
perf_evsel__alloc_id(evsel, cpus->nr, threads->nr) < 0)
return -ENOMEM;
for (cpu = 0; cpu < cpus->nr; cpu++) {
for (thread = 0; thread < threads->nr; thread++) {
int fd = FD(evsel, cpu, thread);
if (evsel->idx || thread) {
if (ioctl(fd, PERF_EVENT_IOC_SET_OUTPUT,
FD(first_evsel, cpu, 0)) != 0)
goto out_unmap;
} else if (__perf_evlist__mmap(evlist, evsel, cpu,
prot, mask, fd) < 0)
goto out_unmap;
if ((evsel->attr.read_format & PERF_FORMAT_ID) &&
perf_evlist__id_add_fd(evlist, evsel, cpu, thread, fd) < 0)
goto out_unmap;
}
}
}
return 0;
if (evlist->cpus->map[0] == -1)
return perf_evlist__mmap_per_thread(evlist, prot, mask);
out_unmap:
for (cpu = 0; cpu < cpus->nr; cpu++) {
if (evlist->mmap[cpu].base != NULL) {
munmap(evlist->mmap[cpu].base, evlist->mmap_len);
evlist->mmap[cpu].base = NULL;
}
}
return -1;
return perf_evlist__mmap_per_cpu(evlist, prot, mask);
}
int perf_evlist__create_maps(struct perf_evlist *evlist, pid_t target_pid,
@ -348,7 +409,7 @@ int perf_evlist__create_maps(struct perf_evlist *evlist, pid_t target_pid,
if (evlist->threads == NULL)
return -1;
if (target_tid != -1)
if (cpu_list == NULL && target_tid != -1)
evlist->cpus = cpu_map__dummy_new();
else
evlist->cpus = cpu_map__new(cpu_list);

3
tools/perf/util/evlist.h
View file

@ -17,6 +17,7 @@ struct perf_evlist {
struct hlist_head heads[PERF_EVLIST__HLIST_SIZE];
int nr_entries;
int nr_fds;
int nr_mmaps;
int mmap_len;
bool overwrite;
union perf_event event_copy;
@ -46,7 +47,7 @@ void perf_evlist__add_pollfd(struct perf_evlist *evlist, int fd);
struct perf_evsel *perf_evlist__id2evsel(struct perf_evlist *evlist, u64 id);
union perf_event *perf_evlist__read_on_cpu(struct perf_evlist *self, int cpu);
union perf_event *perf_evlist__mmap_read(struct perf_evlist *self, int idx);
int perf_evlist__alloc_mmap(struct perf_evlist *evlist);
int perf_evlist__mmap(struct perf_evlist *evlist, int pages, bool overwrite);

2
tools/perf/util/python.c
View file

@ -680,7 +680,7 @@ static PyObject *pyrf_evlist__read_on_cpu(struct pyrf_evlist *pevlist,
&cpu, &sample_id_all))
return NULL;
event = perf_evlist__read_on_cpu(evlist, cpu);
event = perf_evlist__mmap_read(evlist, cpu);
if (event != NULL) {
struct perf_evsel *first;
PyObject *pyevent = pyrf_event__new(event);