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authorPeter Zijlstra <a.p.zijlstra@chello.nl>2010-05-20 14:45:26 +0200
committerIngo Molnar <mingo@elte.hu>2010-05-21 11:37:58 +0200
commit0e2e63dd608bf5844ffae7bf7d860de18a62724c (patch)
tree4ed28432db7d02cfe41cbf568a3f318235f4262b
parent57adc51dce9102b6641269dd04f5b99aac83b820 (diff)
downloadlinux-2.6.34-ux500-0e2e63dd608bf5844ffae7bf7d860de18a62724c.tar.gz
perf-record: Share per-cpu buffers
It seems a waste of space to create a buffer per event, share it per-cpu. Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: Arnaldo Carvalho de Melo <acme@redhat.com> Cc: Frederic Weisbecker <fweisbec@gmail.com> Cc: Paul Mackerras <paulus@samba.org> Cc: Mike Galbraith <efault@gmx.de> Cc: Steven Rostedt <rostedt@goodmis.org> LKML-Reference: <20100521090710.634824884@chello.nl> Signed-off-by: Ingo Molnar <mingo@elte.hu>
-rw-r--r--tools/perf/builtin-record.c52
1 files changed, 28 insertions, 24 deletions
diff --git a/tools/perf/builtin-record.c b/tools/perf/builtin-record.c
index 94e210f8607..9bc89050e6f 100644
--- a/tools/perf/builtin-record.c
+++ b/tools/perf/builtin-record.c
@@ -82,7 +82,7 @@ struct mmap_data {
unsigned int prev;
};
-static struct mmap_data *mmap_array[MAX_NR_CPUS][MAX_COUNTERS];
+static struct mmap_data mmap_array[MAX_NR_CPUS];
static unsigned long mmap_read_head(struct mmap_data *md)
{
@@ -365,18 +365,29 @@ try_again:
if (group && group_fd == -1)
group_fd = fd[nr_cpu][counter][thread_index];
- event_array[nr_poll].fd = fd[nr_cpu][counter][thread_index];
- event_array[nr_poll].events = POLLIN;
- nr_poll++;
-
- mmap_array[nr_cpu][counter][thread_index].counter = counter;
- mmap_array[nr_cpu][counter][thread_index].prev = 0;
- mmap_array[nr_cpu][counter][thread_index].mask = mmap_pages*page_size - 1;
- mmap_array[nr_cpu][counter][thread_index].base = mmap(NULL, (mmap_pages+1)*page_size,
- PROT_READ|PROT_WRITE, MAP_SHARED, fd[nr_cpu][counter][thread_index], 0);
- if (mmap_array[nr_cpu][counter][thread_index].base == MAP_FAILED) {
- error("failed to mmap with %d (%s)\n", errno, strerror(errno));
- exit(-1);
+ if (counter || thread_index) {
+ ret = ioctl(fd[nr_cpu][counter][thread_index],
+ PERF_EVENT_IOC_SET_OUTPUT,
+ fd[nr_cpu][0][0]);
+ if (ret) {
+ error("failed to set output: %d (%s)\n", errno,
+ strerror(errno));
+ exit(-1);
+ }
+ } else {
+ mmap_array[nr_cpu].counter = counter;
+ mmap_array[nr_cpu].prev = 0;
+ mmap_array[nr_cpu].mask = mmap_pages*page_size - 1;
+ mmap_array[nr_cpu].base = mmap(NULL, (mmap_pages+1)*page_size,
+ PROT_READ|PROT_WRITE, MAP_SHARED, fd[nr_cpu][counter][thread_index], 0);
+ if (mmap_array[nr_cpu].base == MAP_FAILED) {
+ error("failed to mmap with %d (%s)\n", errno, strerror(errno));
+ exit(-1);
+ }
+
+ event_array[nr_poll].fd = fd[nr_cpu][counter][thread_index];
+ event_array[nr_poll].events = POLLIN;
+ nr_poll++;
}
if (filter != NULL) {
@@ -477,16 +488,11 @@ static struct perf_event_header finished_round_event = {
static void mmap_read_all(void)
{
- int i, counter, thread;
+ int i;
for (i = 0; i < nr_cpu; i++) {
- for (counter = 0; counter < nr_counters; counter++) {
- for (thread = 0; thread < thread_num; thread++) {
- if (mmap_array[i][counter][thread].base)
- mmap_read(&mmap_array[i][counter][thread]);
- }
-
- }
+ if (mmap_array[i].base)
+ mmap_read(&mmap_array[i]);
}
if (perf_header__has_feat(&session->header, HEADER_TRACE_INFO))
@@ -861,9 +867,7 @@ int cmd_record(int argc, const char **argv, const char *prefix __used)
for (i = 0; i < MAX_NR_CPUS; i++) {
for (j = 0; j < MAX_COUNTERS; j++) {
fd[i][j] = malloc(sizeof(int)*thread_num);
- mmap_array[i][j] = zalloc(
- sizeof(struct mmap_data)*thread_num);
- if (!fd[i][j] || !mmap_array[i][j])
+ if (!fd[i][j])
return -ENOMEM;
}
}