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Commit 079d3f65 authored by Li Zefan's avatar Li Zefan Committed by Ingo Molnar
Browse files

perf kmem: Measure kmalloc/kfree CPU ping-pong call-sites 



Show statistics for allocations and frees on different cpus:

------------------------------------------------------------------------------------------------------
Callsite                           | Total_alloc/Per | Total_req/Per   | Hit   | Ping-pong | Frag
------------------------------------------------------------------------------------------------------
 perf_event_alloc.clone.0+0         |      7504/682   |      7128/648   |     11 |        0 |  5.011%
 alloc_buffer_head+16               |       288/57    |       280/56    |      5 |        0 |  2.778%
 radix_tree_preload+51              |       296/296   |       288/288   |      1 |        0 |  2.703%
 tracepoint_add_probe+32e           |       157/31    |       154/30    |      5 |        0 |  1.911%
 do_maps_open+0                     |       796/12    |       792/12    |     66 |        0 |  0.503%
 sock_alloc_send_pskb+16e           |     23780/495   |     23744/494   |     48 |       38 |  0.151%
 anon_vma_prepare+9a                |      3744/44    |      3740/44    |     85 |        0 |  0.107%
 d_alloc+21                         |     64948/164   |     64944/164   |    396 |        0 |  0.006%
 proc_alloc_inode+23                |    262292/676   |    262288/676   |    388 |        0 |  0.002%
 create_object+28                   |    459600/200   |    459600/200   |   2298 |       71 |  0.000%
 journal_start+67                   |     14440/40    |     14440/40    |    361 |        0 |  0.000%
 get_empty_filp+df                  |     53504/256   |     53504/256   |    209 |        0 |  0.000%
 getname+2a                         |    823296/4096  |    823296/4096  |    201 |        0 |  0.000%
 seq_read+2b0                       |    544768/4096  |    544768/4096  |    133 |        0 |  0.000%
 seq_open+6d                        |     17024/128   |     17024/128   |    133 |        0 |  0.000%
 mmap_region+2e6                    |     11704/88    |     11704/88    |    133 |        0 |  0.000%
 single_open+0                      |      1072/16    |      1072/16    |     67 |        0 |  0.000%
 __alloc_skb+2e                     |     12544/256   |     12544/256   |     49 |       38 |  0.000%
 __sigqueue_alloc+4a                |      1296/144   |      1296/144   |      9 |        8 |  0.000%
 tracepoint_add_probe+6f            |        80/16    |        80/16    |      5 |        0 |  0.000%
------------------------------------------------------------------------------------------------------
...

Signed-off-by: default avatarLi Zefan <lizf@cn.fujitsu.com>
Acked-by: default avatarPekka Enberg <penberg@cs.helsinki.fi>
Cc: Eduard - Gabriel Munteanu <eduard.munteanu@linux360.ro>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: linux-mm@kvack.org <linux-mm@kvack.org>
LKML-Reference: <4B0B6E9F.6020309@cn.fujitsu.com>
Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
parent 7d0d3945

tools/perf/builtin-kmem.c

+94 −28
Original line number Diff line number Diff line
@@ -40,13 +40,14 @@ static int *cpunode_map; 
static int			max_cpu_num;



struct alloc_stat {

	union {

	u64	call_site;

	u64	ptr;

	};

	u64	bytes_req;

	u64	bytes_alloc;

	u32	hit;

	u32	pingpong;



	short	alloc_cpu;



	struct rb_node node;

};
@@ -144,16 +145,13 @@ process_comm_event(event_t *event, unsigned long offset, unsigned long head) 
	return 0;

}



static void insert_alloc_stat(unsigned long ptr,

			      int bytes_req, int bytes_alloc)

static void insert_alloc_stat(unsigned long call_site, unsigned long ptr,

			      int bytes_req, int bytes_alloc, int cpu)

{

	struct rb_node **node = &root_alloc_stat.rb_node;

	struct rb_node *parent = NULL;

	struct alloc_stat *data = NULL;



	if (!alloc_flag)

		return;



	while (*node) {

		parent = *node;

		data = rb_entry(*node, struct alloc_stat, node);
@@ -172,7 +170,10 @@ static void insert_alloc_stat(unsigned long ptr, 
		data->bytes_alloc += bytes_req;

	} else {

		data = malloc(sizeof(*data));

		if (!data)

			die("malloc");

		data->ptr = ptr;

		data->pingpong = 0;

		data->hit = 1;

		data->bytes_req = bytes_req;

		data->bytes_alloc = bytes_alloc;
@@ -180,6 +181,8 @@ static void insert_alloc_stat(unsigned long ptr, 
		rb_link_node(&data->node, parent, node);

		rb_insert_color(&data->node, &root_alloc_stat);

	}

	data->call_site = call_site;

	data->alloc_cpu = cpu;

}



static void insert_caller_stat(unsigned long call_site,
@@ -189,9 +192,6 @@ static void insert_caller_stat(unsigned long call_site, 
	struct rb_node *parent = NULL;

	struct alloc_stat *data = NULL;



	if (!caller_flag)

		return;



	while (*node) {

		parent = *node;

		data = rb_entry(*node, struct alloc_stat, node);
@@ -210,7 +210,10 @@ static void insert_caller_stat(unsigned long call_site, 
		data->bytes_alloc += bytes_req;

	} else {

		data = malloc(sizeof(*data));

		if (!data)

			die("malloc");

		data->call_site = call_site;

		data->pingpong = 0;

		data->hit = 1;

		data->bytes_req = bytes_req;

		data->bytes_alloc = bytes_alloc;
@@ -238,7 +241,7 @@ static void process_alloc_event(struct raw_event_sample *raw, 
	bytes_req = raw_field_value(event, "bytes_req", raw->data);

	bytes_alloc = raw_field_value(event, "bytes_alloc", raw->data);



	insert_alloc_stat(ptr, bytes_req, bytes_alloc);

	insert_alloc_stat(call_site, ptr, bytes_req, bytes_alloc, cpu);

	insert_caller_stat(call_site, bytes_req, bytes_alloc);



	total_requested += bytes_req;
@@ -253,12 +256,58 @@ static void process_alloc_event(struct raw_event_sample *raw, 
	nr_allocs++;

}



static void process_free_event(struct raw_event_sample *raw __used,

			       struct event *event __used,

			       int cpu __used,

static int ptr_cmp(struct alloc_stat *, struct alloc_stat *);

static int callsite_cmp(struct alloc_stat *, struct alloc_stat *);



static struct alloc_stat *search_alloc_stat(unsigned long ptr,

					    unsigned long call_site,

					    struct rb_root *root,

					    sort_fn_t sort_fn)

{

	struct rb_node *node = root->rb_node;

	struct alloc_stat key = { .ptr = ptr, .call_site = call_site };



	while (node) {

		struct alloc_stat *data;

		int cmp;



		data = rb_entry(node, struct alloc_stat, node);



		cmp = sort_fn(&key, data);

		if (cmp < 0)

			node = node->rb_left;

		else if (cmp > 0)

			node = node->rb_right;

		else

			return data;

	}

	return NULL;

}



static void process_free_event(struct raw_event_sample *raw,

			       struct event *event,

			       int cpu,

			       u64 timestamp __used,

			       struct thread *thread __used)

{

	unsigned long ptr;

	struct alloc_stat *s_alloc, *s_caller;



	ptr = raw_field_value(event, "ptr", raw->data);



	s_alloc = search_alloc_stat(ptr, 0, &root_alloc_stat, ptr_cmp);

	if (!s_alloc)

		return;



	if (cpu != s_alloc->alloc_cpu) {

		s_alloc->pingpong++;



		s_caller = search_alloc_stat(0, s_alloc->call_site,

					     &root_caller_stat, callsite_cmp);

		assert(s_caller);

		s_caller->pingpong++;

	}

	s_alloc->alloc_cpu = -1;

}



static void
@@ -379,10 +428,10 @@ static void __print_result(struct rb_root *root, int n_lines, int is_caller) 
{

	struct rb_node *next;



	printf("%.78s\n", graph_dotted_line);

	printf("%-28s|",  is_caller ? "Callsite": "Alloc Ptr");

	printf("Total_alloc/Per | Total_req/Per | Hit  | Frag\n");

	printf("%.78s\n", graph_dotted_line);

	printf("%.102s\n", graph_dotted_line);

	printf(" %-34s |",  is_caller ? "Callsite": "Alloc Ptr");

	printf(" Total_alloc/Per | Total_req/Per   | Hit   | Ping-pong | Frag\n");

	printf("%.102s\n", graph_dotted_line);



	next = rb_first(root);
@@ -390,7 +439,7 @@ static void __print_result(struct rb_root *root, int n_lines, int is_caller) 
		struct alloc_stat *data = rb_entry(next, struct alloc_stat,

						   node);

		struct symbol *sym = NULL;

		char bf[BUFSIZ];

		char buf[BUFSIZ];

		u64 addr;



		if (is_caller) {
@@ -402,26 +451,28 @@ static void __print_result(struct rb_root *root, int n_lines, int is_caller) 
			addr = data->ptr;



		if (sym != NULL)

			snprintf(bf, sizeof(bf), "%s+%Lx", sym->name,

			snprintf(buf, sizeof(buf), "%s+%Lx", sym->name,

				 addr - sym->start);

		else

			snprintf(bf, sizeof(bf), "%#Lx", addr);

			snprintf(buf, sizeof(buf), "%#Lx", addr);

		printf(" %-34s |", buf);



		printf("%-28s|%8llu/%-6lu |%8llu/%-6lu|%6lu|%8.3f%%\n",

		       bf, (unsigned long long)data->bytes_alloc,

		printf(" %9llu/%-5lu | %9llu/%-5lu | %6lu | %8lu | %6.3f%%\n",

		       (unsigned long long)data->bytes_alloc,

		       (unsigned long)data->bytes_alloc / data->hit,

		       (unsigned long long)data->bytes_req,

		       (unsigned long)data->bytes_req / data->hit,

		       (unsigned long)data->hit,

		       (unsigned long)data->pingpong,

		       fragmentation(data->bytes_req, data->bytes_alloc));



		next = rb_next(next);

	}



	if (n_lines == -1)

		printf(" ...                        | ...            | ...           | ...    | ...   \n");

		printf(" ...                                | ...             | ...             | ...    | ...      | ...   \n");



	printf("%.78s\n", graph_dotted_line);

	printf("%.102s\n", graph_dotted_line);

}



static void print_summary(void)
@@ -597,12 +648,27 @@ static struct sort_dimension frag_sort_dimension = { 
	.cmp	= frag_cmp,

};



static int pingpong_cmp(struct alloc_stat *l, struct alloc_stat *r)

{

	if (l->pingpong < r->pingpong)

		return -1;

	else if (l->pingpong > r->pingpong)

		return 1;

	return 0;

}



static struct sort_dimension pingpong_sort_dimension = {

	.name	= "pingpong",

	.cmp	= pingpong_cmp,

};



static struct sort_dimension *avail_sorts[] = {

	&ptr_sort_dimension,

	&callsite_sort_dimension,

	&hit_sort_dimension,

	&bytes_sort_dimension,

	&frag_sort_dimension,

	&pingpong_sort_dimension,

};



#define NUM_AVAIL_SORTS	\
@@ -703,7 +769,7 @@ static const struct option kmem_options[] = { 
		     "stat selector, Pass 'alloc' or 'caller'.",

		     parse_stat_opt),

	OPT_CALLBACK('s', "sort", NULL, "key[,key2...]",

		     "sort by key(s): ptr, call_site, bytes, hit, frag",

		     "sort by keys: ptr, call_site, bytes, hit, pingpong, frag",

		     parse_sort_opt),

	OPT_CALLBACK('l', "line", NULL, "num",

		     "show n lins",