lk/linux-kernel-test
1
0
Fork 0
Code Issues Pull Requests Releases Wiki Activity

perf evsel: Introduce mmap support

Browse Source 
Out of the code in 'perf top'. Record is next in line.

Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Stephane Eranian <eranian@google.com>
Cc: Tom Zanussi <tzanussi@gmail.com>
LKML-Reference: <new-submission>
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Arnaldo Carvalho de Melo
2011-01-12 17:03:24 -02:00
parent dd7927f4f8
commit 70082dd92c
6 changed files with 107 additions and 66 deletions
Download Patch File Download Diff File Expand all files Collapse all files

71
tools/perf/builtin-top.c
View File

@@ -1095,43 +1095,12 @@ static void event__process_sample(const event_t *self,
}
}
struct mmap_data {
void *base;
int mask;
unsigned int prev;
};
static int perf_evsel__alloc_mmap_per_thread(struct perf_evsel *evsel,
int ncpus, int nthreads)
{
evsel->priv = xyarray__new(ncpus, nthreads, sizeof(struct mmap_data));
return evsel->priv != NULL ? 0 : -ENOMEM;
}
static void perf_evsel__free_mmap(struct perf_evsel *evsel)
{
xyarray__delete(evsel->priv);
evsel->priv = NULL;
}
static unsigned int mmap_read_head(struct mmap_data *md)
{
struct perf_event_mmap_page *pc = md->base;
int head;
head = pc->data_head;
rmb();
return head;
}
static void perf_session__mmap_read_counter(struct perf_session *self,
struct perf_evsel *evsel,
int cpu, int thread_idx)
{
struct xyarray *mmap_array = evsel->priv;
struct mmap_data *md = xyarray__entry(mmap_array, cpu, thread_idx);
unsigned int head = mmap_read_head(md);
struct perf_mmap *md = xyarray__entry(evsel->mmap, cpu, thread_idx);
unsigned int head = perf_mmap__read_head(md);
unsigned int old = md->prev;
unsigned char *data = md->base + page_size;
struct sample_data sample;
@@ -1210,35 +1179,9 @@ static void perf_session__mmap_read(struct perf_session *self)
}
}
static void start_counter(int i, struct perf_evlist *evlist,
struct perf_evsel *evsel)
{
struct xyarray *mmap_array = evsel->priv;
struct mmap_data *mm;
int thread_index;
for (thread_index = 0; thread_index < threads->nr; thread_index++) {
assert(FD(evsel, i, thread_index) >= 0);
fcntl(FD(evsel, i, thread_index), F_SETFL, O_NONBLOCK);
evlist->pollfd[evlist->nr_fds].fd = FD(evsel, i, thread_index);
evlist->pollfd[evlist->nr_fds].events = POLLIN;
evlist->nr_fds++;
mm = xyarray__entry(mmap_array, i, thread_index);
mm->prev = 0;
mm->mask = mmap_pages*page_size - 1;
mm->base = mmap(NULL, (mmap_pages+1)*page_size,
PROT_READ, MAP_SHARED, FD(evsel, i, thread_index), 0);
if (mm->base == MAP_FAILED)
die("failed to mmap with %d (%s)\n", errno, strerror(errno));
}
}
static void start_counters(struct perf_evlist *evlist)
{
struct perf_evsel *counter;
int i;
list_for_each_entry(counter, &evlist->entries, node) {
struct perf_event_attr *attr = &counter->attr;
@@ -1282,11 +1225,9 @@ try_again:
die("No CONFIG_PERF_EVENTS=y kernel support configured?\n");
exit(-1);
}
}
for (i = 0; i < cpus->nr; i++) {
list_for_each_entry(counter, &evlist->entries, node)
start_counter(i, evsel_list, counter);
if (perf_evsel__mmap(counter, cpus, threads, mmap_pages, evlist) < 0)
die("failed to mmap with %d (%s)\n", errno, strerror(errno));
}
}
@@ -1453,7 +1394,7 @@ int cmd_top(int argc, const char **argv, const char *prefix __used)
usage_with_options(top_usage, options);
list_for_each_entry(pos, &evsel_list->entries, node) {
if (perf_evsel__alloc_mmap_per_thread(pos, cpus->nr, threads->nr) < 0 ||
if (perf_evsel__alloc_mmap(pos, cpus->nr, threads->nr) < 0 ||
perf_evsel__alloc_fd(pos, cpus->nr, threads->nr) < 0)
goto out_free_fd;
/*
@@ -1485,8 +1426,6 @@ int cmd_top(int argc, const char **argv, const char *prefix __used)
status = __cmd_top();
out_free_fd:
list_for_each_entry(pos, &evsel_list->entries, node)
perf_evsel__free_mmap(pos);
perf_evlist__delete(evsel_list);
return status;