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Subject[tip:perfcounters/core] perf_counter: kerneltop: parse the mmap data stream
Commit-ID:  984cf8720099284c815057d783b68349615cb66e
Gitweb: http://git.kernel.org/tip/984cf8720099284c815057d783b68349615cb66e
Author: Peter Zijlstra <a.p.zijlstra@chello.nl>
AuthorDate: Mon, 30 Mar 2009 19:07:06 +0200
Committer: Ingo Molnar <mingo@elte.hu>
CommitDate: Wed, 1 Apr 2009 11:33:34 +0200

perf_counter: kerneltop: parse the mmap data stream

frob the kerneltop code to print the mmap data in the stream

Better use would be collecting the IPs per PID and mapping them onto
the provided userspace code.. TODO

Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Acked-by: Paul Mackerras <paulus@samba.org>
LKML-Reference: <20090330171023.501902515@chello.nl>
Signed-off-by: Ingo Molnar <mingo@elte.hu>


---
Documentation/perf_counter/kerneltop.c | 50 ++++++++++++++++++++++++++++----
1 files changed, 44 insertions(+), 6 deletions(-)
diff --git a/Documentation/perf_counter/kerneltop.c b/Documentation/perf_counter/kerneltop.c
index 2779c57..995111d 100644
--- a/Documentation/perf_counter/kerneltop.c
+++ b/Documentation/perf_counter/kerneltop.c
@@ -184,6 +184,8 @@ static int nmi = 1;
static int group = 0;
static unsigned int page_size;
static unsigned int mmap_pages = 16;
+static int use_mmap = 0;
+static int use_munmap = 0;

static char *vmlinux;

@@ -333,6 +335,8 @@ static void display_help(void)
" -z --zero # zero counts after display\n"
" -D --dump_symtab # dump symbol table to stderr on startup\n"
" -m pages --mmap_pages=<pages> # number of mmap data pages\n"
+ " -M --mmap_info # print mmap info stream\n"
+ " -U --munmap_info # print munmap info stream\n"
);

exit(0);
@@ -1052,9 +1056,11 @@ static void process_options(int argc, char *argv[])
{"stat", no_argument, NULL, 'S'},
{"zero", no_argument, NULL, 'z'},
{"mmap_pages", required_argument, NULL, 'm'},
+ {"mmap_info", no_argument, NULL, 'M'},
+ {"munmap_info", no_argument, NULL, 'U'},
{NULL, 0, NULL, 0 }
};
- int c = getopt_long(argc, argv, "+:ac:C:d:De:f:g:hn:m:p:s:Sx:z",
+ int c = getopt_long(argc, argv, "+:ac:C:d:De:f:g:hn:m:p:s:Sx:zMU",
long_options, &option_index);
if (c == -1)
break;
@@ -1092,6 +1098,8 @@ static void process_options(int argc, char *argv[])
case 'x': vmlinux = strdup(optarg); break;
case 'z': zero = 1; break;
case 'm': mmap_pages = atoi(optarg); break;
+ case 'M': use_mmap = 1; break;
+ case 'U': use_munmap = 1; break;
default: error = 1; break;
}
}
@@ -1172,12 +1180,29 @@ static void mmap_read(struct mmap_data *md)
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;

@@ -1187,7 +1212,7 @@ static void mmap_read(struct mmap_data *md)
*/
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 {
@@ -1206,7 +1231,18 @@ static void mmap_read(struct mmap_data *md)
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;
}
}
@@ -1255,6 +1291,8 @@ 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 = use_mmap;
+ hw_event.munmap = use_munmap;

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

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