mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-09-05 18:39:59 +00:00
![Yang Jihong](/assets/img/avatar_default.png)
For dummy events that keep tracking, we may need to modify its cpu_maps. For example, change the cpu_maps to record sideband events for all CPUS. Add perf_evlist__go_system_wide() helper to support this scenario. Signed-off-by: Yang Jihong <yangjihong1@huawei.com> Acked-by: Adrian Hunter <adrian.hunter@intel.com> Tested-by: Ravi Bangoria <ravi.bangoria@amd.com> Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com> Cc: Andi Kleen <ak@linux.intel.com> Cc: Anshuman Khandual <anshuman.khandual@arm.com> Cc: Ian Rogers <irogers@google.com> Cc: Ingo Molnar <mingo@redhat.com> Cc: James Clark <james.clark@arm.com> Cc: Jiri Olsa <jolsa@kernel.org> Cc: Kan Liang <kan.liang@linux.intel.com> Cc: Mark Rutland <mark.rutland@arm.com> Cc: Namhyung Kim <namhyung@kernel.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Richter <tmricht@linux.ibm.com> Link: https://lore.kernel.org/r/20230904023340.12707-2-yangjihong1@huawei.com Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
749 lines
18 KiB
C
749 lines
18 KiB
C
// SPDX-License-Identifier: GPL-2.0
|
|
#include <perf/evlist.h>
|
|
#include <perf/evsel.h>
|
|
#include <linux/bitops.h>
|
|
#include <linux/list.h>
|
|
#include <linux/hash.h>
|
|
#include <sys/ioctl.h>
|
|
#include <internal/evlist.h>
|
|
#include <internal/evsel.h>
|
|
#include <internal/xyarray.h>
|
|
#include <internal/mmap.h>
|
|
#include <internal/cpumap.h>
|
|
#include <internal/threadmap.h>
|
|
#include <internal/lib.h>
|
|
#include <linux/zalloc.h>
|
|
#include <stdlib.h>
|
|
#include <errno.h>
|
|
#include <unistd.h>
|
|
#include <fcntl.h>
|
|
#include <signal.h>
|
|
#include <poll.h>
|
|
#include <sys/mman.h>
|
|
#include <perf/cpumap.h>
|
|
#include <perf/threadmap.h>
|
|
#include <api/fd/array.h>
|
|
#include "internal.h"
|
|
|
|
void perf_evlist__init(struct perf_evlist *evlist)
|
|
{
|
|
INIT_LIST_HEAD(&evlist->entries);
|
|
evlist->nr_entries = 0;
|
|
fdarray__init(&evlist->pollfd, 64);
|
|
perf_evlist__reset_id_hash(evlist);
|
|
}
|
|
|
|
static void __perf_evlist__propagate_maps(struct perf_evlist *evlist,
|
|
struct perf_evsel *evsel)
|
|
{
|
|
if (evsel->system_wide) {
|
|
/* System wide: set the cpu map of the evsel to all online CPUs. */
|
|
perf_cpu_map__put(evsel->cpus);
|
|
evsel->cpus = perf_cpu_map__new(NULL);
|
|
} else if (evlist->has_user_cpus && evsel->is_pmu_core) {
|
|
/*
|
|
* User requested CPUs on a core PMU, ensure the requested CPUs
|
|
* are valid by intersecting with those of the PMU.
|
|
*/
|
|
perf_cpu_map__put(evsel->cpus);
|
|
evsel->cpus = perf_cpu_map__intersect(evlist->user_requested_cpus, evsel->own_cpus);
|
|
} else if (!evsel->own_cpus || evlist->has_user_cpus ||
|
|
(!evsel->requires_cpu && perf_cpu_map__has_any_cpu(evlist->user_requested_cpus))) {
|
|
/*
|
|
* The PMU didn't specify a default cpu map, this isn't a core
|
|
* event and the user requested CPUs or the evlist user
|
|
* requested CPUs have the "any CPU" (aka dummy) CPU value. In
|
|
* which case use the user requested CPUs rather than the PMU
|
|
* ones.
|
|
*/
|
|
perf_cpu_map__put(evsel->cpus);
|
|
evsel->cpus = perf_cpu_map__get(evlist->user_requested_cpus);
|
|
} else if (evsel->cpus != evsel->own_cpus) {
|
|
/*
|
|
* No user requested cpu map but the PMU cpu map doesn't match
|
|
* the evsel's. Reset it back to the PMU cpu map.
|
|
*/
|
|
perf_cpu_map__put(evsel->cpus);
|
|
evsel->cpus = perf_cpu_map__get(evsel->own_cpus);
|
|
}
|
|
|
|
if (evsel->system_wide) {
|
|
perf_thread_map__put(evsel->threads);
|
|
evsel->threads = perf_thread_map__new_dummy();
|
|
} else {
|
|
perf_thread_map__put(evsel->threads);
|
|
evsel->threads = perf_thread_map__get(evlist->threads);
|
|
}
|
|
|
|
evlist->all_cpus = perf_cpu_map__merge(evlist->all_cpus, evsel->cpus);
|
|
}
|
|
|
|
static void perf_evlist__propagate_maps(struct perf_evlist *evlist)
|
|
{
|
|
struct perf_evsel *evsel;
|
|
|
|
evlist->needs_map_propagation = true;
|
|
|
|
perf_evlist__for_each_evsel(evlist, evsel)
|
|
__perf_evlist__propagate_maps(evlist, evsel);
|
|
}
|
|
|
|
void perf_evlist__add(struct perf_evlist *evlist,
|
|
struct perf_evsel *evsel)
|
|
{
|
|
evsel->idx = evlist->nr_entries;
|
|
list_add_tail(&evsel->node, &evlist->entries);
|
|
evlist->nr_entries += 1;
|
|
|
|
if (evlist->needs_map_propagation)
|
|
__perf_evlist__propagate_maps(evlist, evsel);
|
|
}
|
|
|
|
void perf_evlist__remove(struct perf_evlist *evlist,
|
|
struct perf_evsel *evsel)
|
|
{
|
|
list_del_init(&evsel->node);
|
|
evlist->nr_entries -= 1;
|
|
}
|
|
|
|
struct perf_evlist *perf_evlist__new(void)
|
|
{
|
|
struct perf_evlist *evlist = zalloc(sizeof(*evlist));
|
|
|
|
if (evlist != NULL)
|
|
perf_evlist__init(evlist);
|
|
|
|
return evlist;
|
|
}
|
|
|
|
struct perf_evsel *
|
|
perf_evlist__next(struct perf_evlist *evlist, struct perf_evsel *prev)
|
|
{
|
|
struct perf_evsel *next;
|
|
|
|
if (!prev) {
|
|
next = list_first_entry(&evlist->entries,
|
|
struct perf_evsel,
|
|
node);
|
|
} else {
|
|
next = list_next_entry(prev, node);
|
|
}
|
|
|
|
/* Empty list is noticed here so don't need checking on entry. */
|
|
if (&next->node == &evlist->entries)
|
|
return NULL;
|
|
|
|
return next;
|
|
}
|
|
|
|
static void perf_evlist__purge(struct perf_evlist *evlist)
|
|
{
|
|
struct perf_evsel *pos, *n;
|
|
|
|
perf_evlist__for_each_entry_safe(evlist, n, pos) {
|
|
list_del_init(&pos->node);
|
|
perf_evsel__delete(pos);
|
|
}
|
|
|
|
evlist->nr_entries = 0;
|
|
}
|
|
|
|
void perf_evlist__exit(struct perf_evlist *evlist)
|
|
{
|
|
perf_cpu_map__put(evlist->user_requested_cpus);
|
|
perf_cpu_map__put(evlist->all_cpus);
|
|
perf_thread_map__put(evlist->threads);
|
|
evlist->user_requested_cpus = NULL;
|
|
evlist->all_cpus = NULL;
|
|
evlist->threads = NULL;
|
|
fdarray__exit(&evlist->pollfd);
|
|
}
|
|
|
|
void perf_evlist__delete(struct perf_evlist *evlist)
|
|
{
|
|
if (evlist == NULL)
|
|
return;
|
|
|
|
perf_evlist__munmap(evlist);
|
|
perf_evlist__close(evlist);
|
|
perf_evlist__purge(evlist);
|
|
perf_evlist__exit(evlist);
|
|
free(evlist);
|
|
}
|
|
|
|
void perf_evlist__set_maps(struct perf_evlist *evlist,
|
|
struct perf_cpu_map *cpus,
|
|
struct perf_thread_map *threads)
|
|
{
|
|
/*
|
|
* Allow for the possibility that one or another of the maps isn't being
|
|
* changed i.e. don't put it. Note we are assuming the maps that are
|
|
* being applied are brand new and evlist is taking ownership of the
|
|
* original reference count of 1. If that is not the case it is up to
|
|
* the caller to increase the reference count.
|
|
*/
|
|
if (cpus != evlist->user_requested_cpus) {
|
|
perf_cpu_map__put(evlist->user_requested_cpus);
|
|
evlist->user_requested_cpus = perf_cpu_map__get(cpus);
|
|
}
|
|
|
|
if (threads != evlist->threads) {
|
|
perf_thread_map__put(evlist->threads);
|
|
evlist->threads = perf_thread_map__get(threads);
|
|
}
|
|
|
|
perf_evlist__propagate_maps(evlist);
|
|
}
|
|
|
|
int perf_evlist__open(struct perf_evlist *evlist)
|
|
{
|
|
struct perf_evsel *evsel;
|
|
int err;
|
|
|
|
perf_evlist__for_each_entry(evlist, evsel) {
|
|
err = perf_evsel__open(evsel, evsel->cpus, evsel->threads);
|
|
if (err < 0)
|
|
goto out_err;
|
|
}
|
|
|
|
return 0;
|
|
|
|
out_err:
|
|
perf_evlist__close(evlist);
|
|
return err;
|
|
}
|
|
|
|
void perf_evlist__close(struct perf_evlist *evlist)
|
|
{
|
|
struct perf_evsel *evsel;
|
|
|
|
perf_evlist__for_each_entry_reverse(evlist, evsel)
|
|
perf_evsel__close(evsel);
|
|
}
|
|
|
|
void perf_evlist__enable(struct perf_evlist *evlist)
|
|
{
|
|
struct perf_evsel *evsel;
|
|
|
|
perf_evlist__for_each_entry(evlist, evsel)
|
|
perf_evsel__enable(evsel);
|
|
}
|
|
|
|
void perf_evlist__disable(struct perf_evlist *evlist)
|
|
{
|
|
struct perf_evsel *evsel;
|
|
|
|
perf_evlist__for_each_entry(evlist, evsel)
|
|
perf_evsel__disable(evsel);
|
|
}
|
|
|
|
u64 perf_evlist__read_format(struct perf_evlist *evlist)
|
|
{
|
|
struct perf_evsel *first = perf_evlist__first(evlist);
|
|
|
|
return first->attr.read_format;
|
|
}
|
|
|
|
#define SID(e, x, y) xyarray__entry(e->sample_id, x, y)
|
|
|
|
static void perf_evlist__id_hash(struct perf_evlist *evlist,
|
|
struct perf_evsel *evsel,
|
|
int cpu, int thread, u64 id)
|
|
{
|
|
int hash;
|
|
struct perf_sample_id *sid = SID(evsel, cpu, thread);
|
|
|
|
sid->id = id;
|
|
sid->evsel = evsel;
|
|
hash = hash_64(sid->id, PERF_EVLIST__HLIST_BITS);
|
|
hlist_add_head(&sid->node, &evlist->heads[hash]);
|
|
}
|
|
|
|
void perf_evlist__reset_id_hash(struct perf_evlist *evlist)
|
|
{
|
|
int i;
|
|
|
|
for (i = 0; i < PERF_EVLIST__HLIST_SIZE; ++i)
|
|
INIT_HLIST_HEAD(&evlist->heads[i]);
|
|
}
|
|
|
|
void perf_evlist__id_add(struct perf_evlist *evlist,
|
|
struct perf_evsel *evsel,
|
|
int cpu, int thread, u64 id)
|
|
{
|
|
perf_evlist__id_hash(evlist, evsel, cpu, thread, id);
|
|
evsel->id[evsel->ids++] = id;
|
|
}
|
|
|
|
int perf_evlist__id_add_fd(struct perf_evlist *evlist,
|
|
struct perf_evsel *evsel,
|
|
int cpu, int thread, int fd)
|
|
{
|
|
u64 read_data[4] = { 0, };
|
|
int id_idx = 1; /* The first entry is the counter value */
|
|
u64 id;
|
|
int ret;
|
|
|
|
ret = ioctl(fd, PERF_EVENT_IOC_ID, &id);
|
|
if (!ret)
|
|
goto add;
|
|
|
|
if (errno != ENOTTY)
|
|
return -1;
|
|
|
|
/* Legacy way to get event id.. All hail to old kernels! */
|
|
|
|
/*
|
|
* This way does not work with group format read, so bail
|
|
* out in that case.
|
|
*/
|
|
if (perf_evlist__read_format(evlist) & PERF_FORMAT_GROUP)
|
|
return -1;
|
|
|
|
if (!(evsel->attr.read_format & PERF_FORMAT_ID) ||
|
|
read(fd, &read_data, sizeof(read_data)) == -1)
|
|
return -1;
|
|
|
|
if (evsel->attr.read_format & PERF_FORMAT_TOTAL_TIME_ENABLED)
|
|
++id_idx;
|
|
if (evsel->attr.read_format & PERF_FORMAT_TOTAL_TIME_RUNNING)
|
|
++id_idx;
|
|
|
|
id = read_data[id_idx];
|
|
|
|
add:
|
|
perf_evlist__id_add(evlist, evsel, cpu, thread, id);
|
|
return 0;
|
|
}
|
|
|
|
int perf_evlist__alloc_pollfd(struct perf_evlist *evlist)
|
|
{
|
|
int nr_cpus = perf_cpu_map__nr(evlist->all_cpus);
|
|
int nr_threads = perf_thread_map__nr(evlist->threads);
|
|
int nfds = 0;
|
|
struct perf_evsel *evsel;
|
|
|
|
perf_evlist__for_each_entry(evlist, evsel) {
|
|
if (evsel->system_wide)
|
|
nfds += nr_cpus;
|
|
else
|
|
nfds += nr_cpus * nr_threads;
|
|
}
|
|
|
|
if (fdarray__available_entries(&evlist->pollfd) < nfds &&
|
|
fdarray__grow(&evlist->pollfd, nfds) < 0)
|
|
return -ENOMEM;
|
|
|
|
return 0;
|
|
}
|
|
|
|
int perf_evlist__add_pollfd(struct perf_evlist *evlist, int fd,
|
|
void *ptr, short revent, enum fdarray_flags flags)
|
|
{
|
|
int pos = fdarray__add(&evlist->pollfd, fd, revent | POLLERR | POLLHUP, flags);
|
|
|
|
if (pos >= 0) {
|
|
evlist->pollfd.priv[pos].ptr = ptr;
|
|
fcntl(fd, F_SETFL, O_NONBLOCK);
|
|
}
|
|
|
|
return pos;
|
|
}
|
|
|
|
static void perf_evlist__munmap_filtered(struct fdarray *fda, int fd,
|
|
void *arg __maybe_unused)
|
|
{
|
|
struct perf_mmap *map = fda->priv[fd].ptr;
|
|
|
|
if (map)
|
|
perf_mmap__put(map);
|
|
}
|
|
|
|
int perf_evlist__filter_pollfd(struct perf_evlist *evlist, short revents_and_mask)
|
|
{
|
|
return fdarray__filter(&evlist->pollfd, revents_and_mask,
|
|
perf_evlist__munmap_filtered, NULL);
|
|
}
|
|
|
|
int perf_evlist__poll(struct perf_evlist *evlist, int timeout)
|
|
{
|
|
return fdarray__poll(&evlist->pollfd, timeout);
|
|
}
|
|
|
|
static struct perf_mmap* perf_evlist__alloc_mmap(struct perf_evlist *evlist, bool overwrite)
|
|
{
|
|
int i;
|
|
struct perf_mmap *map;
|
|
|
|
map = zalloc(evlist->nr_mmaps * sizeof(struct perf_mmap));
|
|
if (!map)
|
|
return NULL;
|
|
|
|
for (i = 0; i < evlist->nr_mmaps; i++) {
|
|
struct perf_mmap *prev = i ? &map[i - 1] : NULL;
|
|
|
|
/*
|
|
* When the perf_mmap() call is made we grab one refcount, plus
|
|
* one extra to let perf_mmap__consume() get the last
|
|
* events after all real references (perf_mmap__get()) are
|
|
* dropped.
|
|
*
|
|
* Each PERF_EVENT_IOC_SET_OUTPUT points to this mmap and
|
|
* thus does perf_mmap__get() on it.
|
|
*/
|
|
perf_mmap__init(&map[i], prev, overwrite, NULL);
|
|
}
|
|
|
|
return map;
|
|
}
|
|
|
|
static void perf_evsel__set_sid_idx(struct perf_evsel *evsel, int idx, int cpu, int thread)
|
|
{
|
|
struct perf_sample_id *sid = SID(evsel, cpu, thread);
|
|
|
|
sid->idx = idx;
|
|
sid->cpu = perf_cpu_map__cpu(evsel->cpus, cpu);
|
|
sid->tid = perf_thread_map__pid(evsel->threads, thread);
|
|
}
|
|
|
|
static struct perf_mmap*
|
|
perf_evlist__mmap_cb_get(struct perf_evlist *evlist, bool overwrite, int idx)
|
|
{
|
|
struct perf_mmap *maps;
|
|
|
|
maps = overwrite ? evlist->mmap_ovw : evlist->mmap;
|
|
|
|
if (!maps) {
|
|
maps = perf_evlist__alloc_mmap(evlist, overwrite);
|
|
if (!maps)
|
|
return NULL;
|
|
|
|
if (overwrite)
|
|
evlist->mmap_ovw = maps;
|
|
else
|
|
evlist->mmap = maps;
|
|
}
|
|
|
|
return &maps[idx];
|
|
}
|
|
|
|
#define FD(e, x, y) (*(int *) xyarray__entry(e->fd, x, y))
|
|
|
|
static int
|
|
perf_evlist__mmap_cb_mmap(struct perf_mmap *map, struct perf_mmap_param *mp,
|
|
int output, struct perf_cpu cpu)
|
|
{
|
|
return perf_mmap__mmap(map, mp, output, cpu);
|
|
}
|
|
|
|
static void perf_evlist__set_mmap_first(struct perf_evlist *evlist, struct perf_mmap *map,
|
|
bool overwrite)
|
|
{
|
|
if (overwrite)
|
|
evlist->mmap_ovw_first = map;
|
|
else
|
|
evlist->mmap_first = map;
|
|
}
|
|
|
|
static int
|
|
mmap_per_evsel(struct perf_evlist *evlist, struct perf_evlist_mmap_ops *ops,
|
|
int idx, struct perf_mmap_param *mp, int cpu_idx,
|
|
int thread, int *_output, int *_output_overwrite, int *nr_mmaps)
|
|
{
|
|
struct perf_cpu evlist_cpu = perf_cpu_map__cpu(evlist->all_cpus, cpu_idx);
|
|
struct perf_evsel *evsel;
|
|
int revent;
|
|
|
|
perf_evlist__for_each_entry(evlist, evsel) {
|
|
bool overwrite = evsel->attr.write_backward;
|
|
enum fdarray_flags flgs;
|
|
struct perf_mmap *map;
|
|
int *output, fd, cpu;
|
|
|
|
if (evsel->system_wide && thread)
|
|
continue;
|
|
|
|
cpu = perf_cpu_map__idx(evsel->cpus, evlist_cpu);
|
|
if (cpu == -1)
|
|
continue;
|
|
|
|
map = ops->get(evlist, overwrite, idx);
|
|
if (map == NULL)
|
|
return -ENOMEM;
|
|
|
|
if (overwrite) {
|
|
mp->prot = PROT_READ;
|
|
output = _output_overwrite;
|
|
} else {
|
|
mp->prot = PROT_READ | PROT_WRITE;
|
|
output = _output;
|
|
}
|
|
|
|
fd = FD(evsel, cpu, thread);
|
|
|
|
if (*output == -1) {
|
|
*output = fd;
|
|
|
|
/*
|
|
* The last one will be done at perf_mmap__consume(), so that we
|
|
* make sure we don't prevent tools from consuming every last event in
|
|
* the ring buffer.
|
|
*
|
|
* I.e. we can get the POLLHUP meaning that the fd doesn't exist
|
|
* anymore, but the last events for it are still in the ring buffer,
|
|
* waiting to be consumed.
|
|
*
|
|
* Tools can chose to ignore this at their own discretion, but the
|
|
* evlist layer can't just drop it when filtering events in
|
|
* perf_evlist__filter_pollfd().
|
|
*/
|
|
refcount_set(&map->refcnt, 2);
|
|
|
|
if (ops->idx)
|
|
ops->idx(evlist, evsel, mp, idx);
|
|
|
|
/* Debug message used by test scripts */
|
|
pr_debug("idx %d: mmapping fd %d\n", idx, *output);
|
|
if (ops->mmap(map, mp, *output, evlist_cpu) < 0)
|
|
return -1;
|
|
|
|
*nr_mmaps += 1;
|
|
|
|
if (!idx)
|
|
perf_evlist__set_mmap_first(evlist, map, overwrite);
|
|
} else {
|
|
/* Debug message used by test scripts */
|
|
pr_debug("idx %d: set output fd %d -> %d\n", idx, fd, *output);
|
|
if (ioctl(fd, PERF_EVENT_IOC_SET_OUTPUT, *output) != 0)
|
|
return -1;
|
|
|
|
perf_mmap__get(map);
|
|
}
|
|
|
|
revent = !overwrite ? POLLIN : 0;
|
|
|
|
flgs = evsel->system_wide ? fdarray_flag__nonfilterable : fdarray_flag__default;
|
|
if (perf_evlist__add_pollfd(evlist, fd, map, revent, flgs) < 0) {
|
|
perf_mmap__put(map);
|
|
return -1;
|
|
}
|
|
|
|
if (evsel->attr.read_format & PERF_FORMAT_ID) {
|
|
if (perf_evlist__id_add_fd(evlist, evsel, cpu, thread,
|
|
fd) < 0)
|
|
return -1;
|
|
perf_evsel__set_sid_idx(evsel, idx, cpu, thread);
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int
|
|
mmap_per_thread(struct perf_evlist *evlist, struct perf_evlist_mmap_ops *ops,
|
|
struct perf_mmap_param *mp)
|
|
{
|
|
int nr_threads = perf_thread_map__nr(evlist->threads);
|
|
int nr_cpus = perf_cpu_map__nr(evlist->all_cpus);
|
|
int cpu, thread, idx = 0;
|
|
int nr_mmaps = 0;
|
|
|
|
pr_debug("%s: nr cpu values (may include -1) %d nr threads %d\n",
|
|
__func__, nr_cpus, nr_threads);
|
|
|
|
/* per-thread mmaps */
|
|
for (thread = 0; thread < nr_threads; thread++, idx++) {
|
|
int output = -1;
|
|
int output_overwrite = -1;
|
|
|
|
if (mmap_per_evsel(evlist, ops, idx, mp, 0, thread, &output,
|
|
&output_overwrite, &nr_mmaps))
|
|
goto out_unmap;
|
|
}
|
|
|
|
/* system-wide mmaps i.e. per-cpu */
|
|
for (cpu = 1; cpu < nr_cpus; cpu++, idx++) {
|
|
int output = -1;
|
|
int output_overwrite = -1;
|
|
|
|
if (mmap_per_evsel(evlist, ops, idx, mp, cpu, 0, &output,
|
|
&output_overwrite, &nr_mmaps))
|
|
goto out_unmap;
|
|
}
|
|
|
|
if (nr_mmaps != evlist->nr_mmaps)
|
|
pr_err("Miscounted nr_mmaps %d vs %d\n", nr_mmaps, evlist->nr_mmaps);
|
|
|
|
return 0;
|
|
|
|
out_unmap:
|
|
perf_evlist__munmap(evlist);
|
|
return -1;
|
|
}
|
|
|
|
static int
|
|
mmap_per_cpu(struct perf_evlist *evlist, struct perf_evlist_mmap_ops *ops,
|
|
struct perf_mmap_param *mp)
|
|
{
|
|
int nr_threads = perf_thread_map__nr(evlist->threads);
|
|
int nr_cpus = perf_cpu_map__nr(evlist->all_cpus);
|
|
int nr_mmaps = 0;
|
|
int cpu, thread;
|
|
|
|
pr_debug("%s: nr cpu values %d nr threads %d\n", __func__, nr_cpus, nr_threads);
|
|
|
|
for (cpu = 0; cpu < nr_cpus; cpu++) {
|
|
int output = -1;
|
|
int output_overwrite = -1;
|
|
|
|
for (thread = 0; thread < nr_threads; thread++) {
|
|
if (mmap_per_evsel(evlist, ops, cpu, mp, cpu,
|
|
thread, &output, &output_overwrite, &nr_mmaps))
|
|
goto out_unmap;
|
|
}
|
|
}
|
|
|
|
if (nr_mmaps != evlist->nr_mmaps)
|
|
pr_err("Miscounted nr_mmaps %d vs %d\n", nr_mmaps, evlist->nr_mmaps);
|
|
|
|
return 0;
|
|
|
|
out_unmap:
|
|
perf_evlist__munmap(evlist);
|
|
return -1;
|
|
}
|
|
|
|
static int perf_evlist__nr_mmaps(struct perf_evlist *evlist)
|
|
{
|
|
int nr_mmaps;
|
|
|
|
/* One for each CPU */
|
|
nr_mmaps = perf_cpu_map__nr(evlist->all_cpus);
|
|
if (perf_cpu_map__empty(evlist->all_cpus)) {
|
|
/* Plus one for each thread */
|
|
nr_mmaps += perf_thread_map__nr(evlist->threads);
|
|
/* Minus the per-thread CPU (-1) */
|
|
nr_mmaps -= 1;
|
|
}
|
|
|
|
return nr_mmaps;
|
|
}
|
|
|
|
int perf_evlist__mmap_ops(struct perf_evlist *evlist,
|
|
struct perf_evlist_mmap_ops *ops,
|
|
struct perf_mmap_param *mp)
|
|
{
|
|
const struct perf_cpu_map *cpus = evlist->all_cpus;
|
|
struct perf_evsel *evsel;
|
|
|
|
if (!ops || !ops->get || !ops->mmap)
|
|
return -EINVAL;
|
|
|
|
mp->mask = evlist->mmap_len - page_size - 1;
|
|
|
|
evlist->nr_mmaps = perf_evlist__nr_mmaps(evlist);
|
|
|
|
perf_evlist__for_each_entry(evlist, evsel) {
|
|
if ((evsel->attr.read_format & PERF_FORMAT_ID) &&
|
|
evsel->sample_id == NULL &&
|
|
perf_evsel__alloc_id(evsel, evsel->fd->max_x, evsel->fd->max_y) < 0)
|
|
return -ENOMEM;
|
|
}
|
|
|
|
if (evlist->pollfd.entries == NULL && perf_evlist__alloc_pollfd(evlist) < 0)
|
|
return -ENOMEM;
|
|
|
|
if (perf_cpu_map__empty(cpus))
|
|
return mmap_per_thread(evlist, ops, mp);
|
|
|
|
return mmap_per_cpu(evlist, ops, mp);
|
|
}
|
|
|
|
int perf_evlist__mmap(struct perf_evlist *evlist, int pages)
|
|
{
|
|
struct perf_mmap_param mp;
|
|
struct perf_evlist_mmap_ops ops = {
|
|
.get = perf_evlist__mmap_cb_get,
|
|
.mmap = perf_evlist__mmap_cb_mmap,
|
|
};
|
|
|
|
evlist->mmap_len = (pages + 1) * page_size;
|
|
|
|
return perf_evlist__mmap_ops(evlist, &ops, &mp);
|
|
}
|
|
|
|
void perf_evlist__munmap(struct perf_evlist *evlist)
|
|
{
|
|
int i;
|
|
|
|
if (evlist->mmap) {
|
|
for (i = 0; i < evlist->nr_mmaps; i++)
|
|
perf_mmap__munmap(&evlist->mmap[i]);
|
|
}
|
|
|
|
if (evlist->mmap_ovw) {
|
|
for (i = 0; i < evlist->nr_mmaps; i++)
|
|
perf_mmap__munmap(&evlist->mmap_ovw[i]);
|
|
}
|
|
|
|
zfree(&evlist->mmap);
|
|
zfree(&evlist->mmap_ovw);
|
|
}
|
|
|
|
struct perf_mmap*
|
|
perf_evlist__next_mmap(struct perf_evlist *evlist, struct perf_mmap *map,
|
|
bool overwrite)
|
|
{
|
|
if (map)
|
|
return map->next;
|
|
|
|
return overwrite ? evlist->mmap_ovw_first : evlist->mmap_first;
|
|
}
|
|
|
|
void __perf_evlist__set_leader(struct list_head *list, struct perf_evsel *leader)
|
|
{
|
|
struct perf_evsel *evsel;
|
|
int n = 0;
|
|
|
|
__perf_evlist__for_each_entry(list, evsel) {
|
|
evsel->leader = leader;
|
|
n++;
|
|
}
|
|
leader->nr_members = n;
|
|
}
|
|
|
|
void perf_evlist__set_leader(struct perf_evlist *evlist)
|
|
{
|
|
if (evlist->nr_entries) {
|
|
struct perf_evsel *first = list_entry(evlist->entries.next,
|
|
struct perf_evsel, node);
|
|
|
|
__perf_evlist__set_leader(&evlist->entries, first);
|
|
}
|
|
}
|
|
|
|
int perf_evlist__nr_groups(struct perf_evlist *evlist)
|
|
{
|
|
struct perf_evsel *evsel;
|
|
int nr_groups = 0;
|
|
|
|
perf_evlist__for_each_evsel(evlist, evsel) {
|
|
/*
|
|
* evsels by default have a nr_members of 1, and they are their
|
|
* own leader. If the nr_members is >1 then this is an
|
|
* indication of a group.
|
|
*/
|
|
if (evsel->leader == evsel && evsel->nr_members > 1)
|
|
nr_groups++;
|
|
}
|
|
return nr_groups;
|
|
}
|
|
|
|
void perf_evlist__go_system_wide(struct perf_evlist *evlist, struct perf_evsel *evsel)
|
|
{
|
|
if (!evsel->system_wide) {
|
|
evsel->system_wide = true;
|
|
if (evlist->needs_map_propagation)
|
|
__perf_evlist__propagate_maps(evlist, evsel);
|
|
}
|
|
}
|