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Subject[RFC][PATCH 3/3] perf_counter: kerneltop: parse the mmap data stream
frob the kerneltop code to print the mmap data in the stream

Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
---
Documentation/perf_counter/kerneltop.c | 39 ++++++++++++++++++++++++++++-----
1 file changed, 34 insertions(+), 5 deletions(-)

Index: linux-2.6/Documentation/perf_counter/kerneltop.c
===================================================================
--- linux-2.6.orig/Documentation/perf_counter/kerneltop.c
+++ linux-2.6/Documentation/perf_counter/kerneltop.c
@@ -1184,12 +1184,29 @@ static void mmap_read(struct mmap_data *
last_read = this_read;

for (; old != head;) {
- struct event_struct {
+ struct ip_event {
struct perf_event_header header;
__u64 ip;
__u32 pid, tid;
- } *event = (struct event_struct *)&data[old & md->mask];
- struct event_struct event_copy;
+ };
+ struct mmap_event {
+ struct perf_event_header header;
+ __u32 pid, tid;
+ __u64 start;
+ __u64 len;
+ __u64 pgoff;
+ char filename[PATH_MAX];
+ };
+
+ typedef union event_union {
+ struct perf_event_header header;
+ struct ip_event ip;
+ struct mmap_event mmap;
+ } event_t;
+
+ event_t *event = (event_t *)&data[old & md->mask];
+
+ event_t event_copy;

unsigned int size = event->header.size;

@@ -1199,7 +1216,7 @@ static void mmap_read(struct mmap_data *
*/
if ((old & md->mask) + size != ((old + size) & md->mask)) {
unsigned int offset = old;
- unsigned int len = sizeof(*event), cpy;
+ unsigned int len = min(sizeof(*event), size), cpy;
void *dst = &event_copy;

do {
@@ -1218,7 +1235,18 @@ static void mmap_read(struct mmap_data *
switch (event->header.type) {
case PERF_EVENT_IP:
case PERF_EVENT_IP | __PERF_EVENT_TID:
- process_event(event->ip, md->counter);
+ process_event(event->ip.ip, md->counter);
+ break;
+
+ case PERF_EVENT_MMAP:
+ case PERF_EVENT_MUNMAP:
+ printf("%s: %Lu %Lu %Lu %s\n",
+ event->header.type == PERF_EVENT_MMAP
+ ? "mmap" : "munmap",
+ event->mmap.start,
+ event->mmap.len,
+ event->mmap.pgoff,
+ event->mmap.filename);
break;
}
}
@@ -1267,6 +1295,7 @@ int main(int argc, char *argv[])
hw_event.record_type = PERF_RECORD_IRQ;
hw_event.nmi = nmi;
hw_event.include_tid = 1;
+ hw_event.mmap = 1;

fd[i][counter] = sys_perf_counter_open(&hw_event, tid, cpu, group_fd, 0);
if (fd[i][counter] < 0) {
--



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