Donate to e Foundation | Murena handsets with /e/OS | Own a part of Murena! Learn more

Commit 3c1ba6fa authored by Peter Zijlstra's avatar Peter Zijlstra Committed by Ingo Molnar
Browse files

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: default avatarPeter Zijlstra <a.p.zijlstra@chello.nl>
Acked-by: default avatarPaul Mackerras <paulus@samba.org>
Orig-LKML-Reference: <20090330171023.501902515@chello.nl>
Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
parent 0a4a9391

Documentation/perf_counter/kerneltop.c

+44 −6
Original line number Diff line number Diff line
@@ -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) {