linux/tools/perf/builtin-kmem.c
Arnaldo Carvalho de Melo 1ed091c45a perf tools: Consolidate symbol resolving across all tools
Now we have a very high level routine for simple tools to
process IP sample events:

	int event__preprocess_sample(const event_t *self,
				     struct addr_location *al,
				     symbol_filter_t filter)

It receives the event itself and will insert new threads in the
global threads list and resolve the map and symbol, filling all
this info into the new addr_location struct, so that tools like
annotate and report can further process the event by creating
hist_entries in their specific way (with or without callgraphs,
etc).

It in turn uses the new next layer function:

	void thread__find_addr_location(struct thread *self, u8 cpumode,
					enum map_type type, u64 addr,
					struct addr_location *al,
					symbol_filter_t filter)

This one will, given a thread (userspace or the kernel kthread
one), will find the given type (MAP__FUNCTION now, MAP__VARIABLE
too in the near future) at the given cpumode, taking vdsos into
account (userspace hit, but kernel symbol) and will fill all
these details in the addr_location given.

Tools that need a more compact API for plain function
resolution, like 'kmem', can use this other one:

	struct symbol *thread__find_function(struct thread *self, u64 addr,
					     symbol_filter_t filter)

So, to resolve a kernel symbol, that is all the 'kmem' tool
needs, its just a matter of calling:

	sym = thread__find_function(kthread, addr, NULL);

The 'filter' parameter is needed because we do lazy
parsing/loading of ELF symtabs or /proc/kallsyms.

With this we remove more code duplication all around, which is
always good, huh? :-)

Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Frédéric Weisbecker <fweisbec@gmail.com>
Cc: John Kacur <jkacur@redhat.com>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Paul Mackerras <paulus@samba.org>
LKML-Reference: <1259346563-12568-12-git-send-email-acme@infradead.org>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
2009-11-27 20:22:02 +01:00

808 lines
17 KiB
C

#include "builtin.h"
#include "perf.h"
#include "util/util.h"
#include "util/cache.h"
#include "util/symbol.h"
#include "util/thread.h"
#include "util/header.h"
#include "util/parse-options.h"
#include "util/trace-event.h"
#include "util/debug.h"
#include "util/data_map.h"
#include <linux/rbtree.h>
struct alloc_stat;
typedef int (*sort_fn_t)(struct alloc_stat *, struct alloc_stat *);
static char const *input_name = "perf.data";
static struct perf_header *header;
static u64 sample_type;
static int alloc_flag;
static int caller_flag;
static int alloc_lines = -1;
static int caller_lines = -1;
static bool raw_ip;
static char default_sort_order[] = "frag,hit,bytes";
static int *cpunode_map;
static int max_cpu_num;
struct alloc_stat {
u64 call_site;
u64 ptr;
u64 bytes_req;
u64 bytes_alloc;
u32 hit;
u32 pingpong;
short alloc_cpu;
struct rb_node node;
};
static struct rb_root root_alloc_stat;
static struct rb_root root_alloc_sorted;
static struct rb_root root_caller_stat;
static struct rb_root root_caller_sorted;
static unsigned long total_requested, total_allocated;
static unsigned long nr_allocs, nr_cross_allocs;
struct raw_event_sample {
u32 size;
char data[0];
};
#define PATH_SYS_NODE "/sys/devices/system/node"
static void init_cpunode_map(void)
{
FILE *fp;
int i;
fp = fopen("/sys/devices/system/cpu/kernel_max", "r");
if (!fp) {
max_cpu_num = 4096;
return;
}
if (fscanf(fp, "%d", &max_cpu_num) < 1)
die("Failed to read 'kernel_max' from sysfs");
max_cpu_num++;
cpunode_map = calloc(max_cpu_num, sizeof(int));
if (!cpunode_map)
die("calloc");
for (i = 0; i < max_cpu_num; i++)
cpunode_map[i] = -1;
fclose(fp);
}
static void setup_cpunode_map(void)
{
struct dirent *dent1, *dent2;
DIR *dir1, *dir2;
unsigned int cpu, mem;
char buf[PATH_MAX];
init_cpunode_map();
dir1 = opendir(PATH_SYS_NODE);
if (!dir1)
return;
while (true) {
dent1 = readdir(dir1);
if (!dent1)
break;
if (sscanf(dent1->d_name, "node%u", &mem) < 1)
continue;
snprintf(buf, PATH_MAX, "%s/%s", PATH_SYS_NODE, dent1->d_name);
dir2 = opendir(buf);
if (!dir2)
continue;
while (true) {
dent2 = readdir(dir2);
if (!dent2)
break;
if (sscanf(dent2->d_name, "cpu%u", &cpu) < 1)
continue;
cpunode_map[cpu] = mem;
}
}
}
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;
while (*node) {
parent = *node;
data = rb_entry(*node, struct alloc_stat, node);
if (ptr > data->ptr)
node = &(*node)->rb_right;
else if (ptr < data->ptr)
node = &(*node)->rb_left;
else
break;
}
if (data && data->ptr == ptr) {
data->hit++;
data->bytes_req += bytes_req;
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;
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,
int bytes_req, int bytes_alloc)
{
struct rb_node **node = &root_caller_stat.rb_node;
struct rb_node *parent = NULL;
struct alloc_stat *data = NULL;
while (*node) {
parent = *node;
data = rb_entry(*node, struct alloc_stat, node);
if (call_site > data->call_site)
node = &(*node)->rb_right;
else if (call_site < data->call_site)
node = &(*node)->rb_left;
else
break;
}
if (data && data->call_site == call_site) {
data->hit++;
data->bytes_req += bytes_req;
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;
rb_link_node(&data->node, parent, node);
rb_insert_color(&data->node, &root_caller_stat);
}
}
static void process_alloc_event(struct raw_event_sample *raw,
struct event *event,
int cpu,
u64 timestamp __used,
struct thread *thread __used,
int node)
{
unsigned long call_site;
unsigned long ptr;
int bytes_req;
int bytes_alloc;
int node1, node2;
ptr = raw_field_value(event, "ptr", raw->data);
call_site = raw_field_value(event, "call_site", raw->data);
bytes_req = raw_field_value(event, "bytes_req", raw->data);
bytes_alloc = raw_field_value(event, "bytes_alloc", raw->data);
insert_alloc_stat(call_site, ptr, bytes_req, bytes_alloc, cpu);
insert_caller_stat(call_site, bytes_req, bytes_alloc);
total_requested += bytes_req;
total_allocated += bytes_alloc;
if (node) {
node1 = cpunode_map[cpu];
node2 = raw_field_value(event, "node", raw->data);
if (node1 != node2)
nr_cross_allocs++;
}
nr_allocs++;
}
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
process_raw_event(event_t *raw_event __used, void *more_data,
int cpu, u64 timestamp, struct thread *thread)
{
struct raw_event_sample *raw = more_data;
struct event *event;
int type;
type = trace_parse_common_type(raw->data);
event = trace_find_event(type);
if (!strcmp(event->name, "kmalloc") ||
!strcmp(event->name, "kmem_cache_alloc")) {
process_alloc_event(raw, event, cpu, timestamp, thread, 0);
return;
}
if (!strcmp(event->name, "kmalloc_node") ||
!strcmp(event->name, "kmem_cache_alloc_node")) {
process_alloc_event(raw, event, cpu, timestamp, thread, 1);
return;
}
if (!strcmp(event->name, "kfree") ||
!strcmp(event->name, "kmem_cache_free")) {
process_free_event(raw, event, cpu, timestamp, thread);
return;
}
}
static int process_sample_event(event_t *event)
{
u64 ip = event->ip.ip;
u64 timestamp = -1;
u32 cpu = -1;
u64 period = 1;
void *more_data = event->ip.__more_data;
struct thread *thread = threads__findnew(event->ip.pid);
if (sample_type & PERF_SAMPLE_TIME) {
timestamp = *(u64 *)more_data;
more_data += sizeof(u64);
}
if (sample_type & PERF_SAMPLE_CPU) {
cpu = *(u32 *)more_data;
more_data += sizeof(u32);
more_data += sizeof(u32); /* reserved */
}
if (sample_type & PERF_SAMPLE_PERIOD) {
period = *(u64 *)more_data;
more_data += sizeof(u64);
}
dump_printf("(IP, %d): %d/%d: %p period: %Ld\n",
event->header.misc,
event->ip.pid, event->ip.tid,
(void *)(long)ip,
(long long)period);
if (thread == NULL) {
pr_debug("problem processing %d event, skipping it.\n",
event->header.type);
return -1;
}
dump_printf(" ... thread: %s:%d\n", thread->comm, thread->pid);
process_raw_event(event, more_data, cpu, timestamp, thread);
return 0;
}
static int sample_type_check(u64 type)
{
sample_type = type;
if (!(sample_type & PERF_SAMPLE_RAW)) {
fprintf(stderr,
"No trace sample to read. Did you call perf record "
"without -R?");
return -1;
}
return 0;
}
static struct perf_file_handler file_handler = {
.process_sample_event = process_sample_event,
.process_comm_event = event__process_comm,
.sample_type_check = sample_type_check,
};
static int read_events(void)
{
register_idle_thread();
register_perf_file_handler(&file_handler);
return mmap_dispatch_perf_file(&header, input_name, 0, 0,
&event__cwdlen, &event__cwd);
}
static double fragmentation(unsigned long n_req, unsigned long n_alloc)
{
if (n_alloc == 0)
return 0.0;
else
return 100.0 - (100.0 * n_req / n_alloc);
}
static void __print_result(struct rb_root *root, int n_lines, int is_caller)
{
struct rb_node *next;
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);
while (next && n_lines--) {
struct alloc_stat *data = rb_entry(next, struct alloc_stat,
node);
struct symbol *sym = NULL;
char buf[BUFSIZ];
u64 addr;
if (is_caller) {
addr = data->call_site;
if (!raw_ip)
sym = thread__find_function(kthread, addr, NULL);
} else
addr = data->ptr;
if (sym != NULL)
snprintf(buf, sizeof(buf), "%s+%Lx", sym->name,
addr - sym->start);
else
snprintf(buf, sizeof(buf), "%#Lx", addr);
printf(" %-34s |", buf);
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("%.102s\n", graph_dotted_line);
}
static void print_summary(void)
{
printf("\nSUMMARY\n=======\n");
printf("Total bytes requested: %lu\n", total_requested);
printf("Total bytes allocated: %lu\n", total_allocated);
printf("Total bytes wasted on internal fragmentation: %lu\n",
total_allocated - total_requested);
printf("Internal fragmentation: %f%%\n",
fragmentation(total_requested, total_allocated));
printf("Cross CPU allocations: %lu/%lu\n", nr_cross_allocs, nr_allocs);
}
static void print_result(void)
{
if (caller_flag)
__print_result(&root_caller_sorted, caller_lines, 1);
if (alloc_flag)
__print_result(&root_alloc_sorted, alloc_lines, 0);
print_summary();
}
struct sort_dimension {
const char name[20];
sort_fn_t cmp;
struct list_head list;
};
static LIST_HEAD(caller_sort);
static LIST_HEAD(alloc_sort);
static void sort_insert(struct rb_root *root, struct alloc_stat *data,
struct list_head *sort_list)
{
struct rb_node **new = &(root->rb_node);
struct rb_node *parent = NULL;
struct sort_dimension *sort;
while (*new) {
struct alloc_stat *this;
int cmp = 0;
this = rb_entry(*new, struct alloc_stat, node);
parent = *new;
list_for_each_entry(sort, sort_list, list) {
cmp = sort->cmp(data, this);
if (cmp)
break;
}
if (cmp > 0)
new = &((*new)->rb_left);
else
new = &((*new)->rb_right);
}
rb_link_node(&data->node, parent, new);
rb_insert_color(&data->node, root);
}
static void __sort_result(struct rb_root *root, struct rb_root *root_sorted,
struct list_head *sort_list)
{
struct rb_node *node;
struct alloc_stat *data;
for (;;) {
node = rb_first(root);
if (!node)
break;
rb_erase(node, root);
data = rb_entry(node, struct alloc_stat, node);
sort_insert(root_sorted, data, sort_list);
}
}
static void sort_result(void)
{
__sort_result(&root_alloc_stat, &root_alloc_sorted, &alloc_sort);
__sort_result(&root_caller_stat, &root_caller_sorted, &caller_sort);
}
static int __cmd_kmem(void)
{
setup_pager();
read_events();
sort_result();
print_result();
return 0;
}
static const char * const kmem_usage[] = {
"perf kmem [<options>] {record}",
NULL
};
static int ptr_cmp(struct alloc_stat *l, struct alloc_stat *r)
{
if (l->ptr < r->ptr)
return -1;
else if (l->ptr > r->ptr)
return 1;
return 0;
}
static struct sort_dimension ptr_sort_dimension = {
.name = "ptr",
.cmp = ptr_cmp,
};
static int callsite_cmp(struct alloc_stat *l, struct alloc_stat *r)
{
if (l->call_site < r->call_site)
return -1;
else if (l->call_site > r->call_site)
return 1;
return 0;
}
static struct sort_dimension callsite_sort_dimension = {
.name = "callsite",
.cmp = callsite_cmp,
};
static int hit_cmp(struct alloc_stat *l, struct alloc_stat *r)
{
if (l->hit < r->hit)
return -1;
else if (l->hit > r->hit)
return 1;
return 0;
}
static struct sort_dimension hit_sort_dimension = {
.name = "hit",
.cmp = hit_cmp,
};
static int bytes_cmp(struct alloc_stat *l, struct alloc_stat *r)
{
if (l->bytes_alloc < r->bytes_alloc)
return -1;
else if (l->bytes_alloc > r->bytes_alloc)
return 1;
return 0;
}
static struct sort_dimension bytes_sort_dimension = {
.name = "bytes",
.cmp = bytes_cmp,
};
static int frag_cmp(struct alloc_stat *l, struct alloc_stat *r)
{
double x, y;
x = fragmentation(l->bytes_req, l->bytes_alloc);
y = fragmentation(r->bytes_req, r->bytes_alloc);
if (x < y)
return -1;
else if (x > y)
return 1;
return 0;
}
static struct sort_dimension frag_sort_dimension = {
.name = "frag",
.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 \
(int)(sizeof(avail_sorts) / sizeof(struct sort_dimension *))
static int sort_dimension__add(const char *tok, struct list_head *list)
{
struct sort_dimension *sort;
int i;
for (i = 0; i < NUM_AVAIL_SORTS; i++) {
if (!strcmp(avail_sorts[i]->name, tok)) {
sort = malloc(sizeof(*sort));
if (!sort)
die("malloc");
memcpy(sort, avail_sorts[i], sizeof(*sort));
list_add_tail(&sort->list, list);
return 0;
}
}
return -1;
}
static int setup_sorting(struct list_head *sort_list, const char *arg)
{
char *tok;
char *str = strdup(arg);
if (!str)
die("strdup");
while (true) {
tok = strsep(&str, ",");
if (!tok)
break;
if (sort_dimension__add(tok, sort_list) < 0) {
error("Unknown --sort key: '%s'", tok);
return -1;
}
}
free(str);
return 0;
}
static int parse_sort_opt(const struct option *opt __used,
const char *arg, int unset __used)
{
if (!arg)
return -1;
if (caller_flag > alloc_flag)
return setup_sorting(&caller_sort, arg);
else
return setup_sorting(&alloc_sort, arg);
return 0;
}
static int parse_stat_opt(const struct option *opt __used,
const char *arg, int unset __used)
{
if (!arg)
return -1;
if (strcmp(arg, "alloc") == 0)
alloc_flag = (caller_flag + 1);
else if (strcmp(arg, "caller") == 0)
caller_flag = (alloc_flag + 1);
else
return -1;
return 0;
}
static int parse_line_opt(const struct option *opt __used,
const char *arg, int unset __used)
{
int lines;
if (!arg)
return -1;
lines = strtoul(arg, NULL, 10);
if (caller_flag > alloc_flag)
caller_lines = lines;
else
alloc_lines = lines;
return 0;
}
static const struct option kmem_options[] = {
OPT_STRING('i', "input", &input_name, "file",
"input file name"),
OPT_CALLBACK(0, "stat", NULL, "<alloc>|<caller>",
"stat selector, Pass 'alloc' or 'caller'.",
parse_stat_opt),
OPT_CALLBACK('s', "sort", NULL, "key[,key2...]",
"sort by keys: ptr, call_site, bytes, hit, pingpong, frag",
parse_sort_opt),
OPT_CALLBACK('l', "line", NULL, "num",
"show n lins",
parse_line_opt),
OPT_BOOLEAN(0, "raw-ip", &raw_ip, "show raw ip instead of symbol"),
OPT_END()
};
static const char *record_args[] = {
"record",
"-a",
"-R",
"-M",
"-f",
"-c", "1",
"-e", "kmem:kmalloc",
"-e", "kmem:kmalloc_node",
"-e", "kmem:kfree",
"-e", "kmem:kmem_cache_alloc",
"-e", "kmem:kmem_cache_alloc_node",
"-e", "kmem:kmem_cache_free",
};
static int __cmd_record(int argc, const char **argv)
{
unsigned int rec_argc, i, j;
const char **rec_argv;
rec_argc = ARRAY_SIZE(record_args) + argc - 1;
rec_argv = calloc(rec_argc + 1, sizeof(char *));
for (i = 0; i < ARRAY_SIZE(record_args); i++)
rec_argv[i] = strdup(record_args[i]);
for (j = 1; j < (unsigned int)argc; j++, i++)
rec_argv[i] = argv[j];
return cmd_record(i, rec_argv, NULL);
}
int cmd_kmem(int argc, const char **argv, const char *prefix __used)
{
symbol__init(0);
argc = parse_options(argc, argv, kmem_options, kmem_usage, 0);
if (argc && !strncmp(argv[0], "rec", 3))
return __cmd_record(argc, argv);
else if (argc)
usage_with_options(kmem_usage, kmem_options);
if (list_empty(&caller_sort))
setup_sorting(&caller_sort, default_sort_order);
if (list_empty(&alloc_sort))
setup_sorting(&alloc_sort, default_sort_order);
setup_cpunode_map();
return __cmd_kmem();
}