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stack_helpers.c
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stack_helpers.c
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#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <errno.h>
#include <linux/const.h>
#include <linux/refcount.h>
#include <linux/rblist.h>
#include <monitor.h>
#include <tep.h>
#include <trace_helpers.h>
#include <stack_helpers.h>
#define ALIGN(x, a) __ALIGN_KERNEL((x), (a))
static struct global_syms {
struct ksyms *ksyms;
struct syms_cache *syms_cache;
refcount_t ksyms_ref;
refcount_t syms_ref;
struct comm_notify notify;
} ctx;
/*
* ffffffff81ad6db9 system_call_fastpath+0x16 ([kernel.kallsyms])
* 00007efd88d7ea20 __write_nocancel+0x7 (/usr/lib64/libc-2.17.so)
* addr symbol +offset (dso)
*
* addr symbol+offset (dso)...addr symbol+offset (dso)
* ^ ^
* `seperate `end
**/
struct callchain_ctx {
u64 kernel : 1, /* need kernel symbols, /proc/kallsyms */
user : 1, /* need user symbols, /proc/pid/maps */
addr : 1, /* print addr */
symbol : 1, /* print symbol */
offset : 1, /* print +offset */
dso : 1, /* print (dso) */
reverse : 1, /* reverse, down to top */
debug : 1, /* debug, print PERF_CONTEXT_* */
print2string_kernel : 1, /* convert to string, for kernel callchain */
print2string_user : 1; /* convert to string, for user callchain */
char seperate;
char end;
FILE *fout;
};
static int task_exit_free_syms(struct comm_notify *notify, int pid, int state, u64 free_time)
{
struct global_syms *g = container_of(notify, struct global_syms, notify);
if (g->syms_cache) {
syms_cache__free_syms(g->syms_cache, pid);
}
return 0;
}
static int global_syms_ref(bool kernel, bool user)
{
if (kernel) {
if (!ctx.ksyms) {
ctx.ksyms = ksyms__load();
if (!ctx.ksyms)
return -1;
refcount_set(&ctx.ksyms_ref, 1);
} else
refcount_inc(&ctx.ksyms_ref);
}
if (user) {
if (!ctx.syms_cache) {
ctx.syms_cache = syms_cache__new();
if (!ctx.syms_cache)
return -1;
refcount_set(&ctx.syms_ref, 1);
ctx.notify.notify = task_exit_free_syms;
global_comm_register_notify(&ctx.notify);
} else
refcount_inc(&ctx.syms_ref);
}
return 0;
}
static void global_syms_unref(bool kernel, bool user)
{
if (kernel && ctx.ksyms && refcount_dec_and_test(&ctx.ksyms_ref)) {
ksyms__free(ctx.ksyms);
ctx.ksyms = NULL;
}
if (user && ctx.syms_cache && refcount_dec_and_test(&ctx.syms_ref)) {
global_comm_unregister_notify(&ctx.notify);
syms_cache__free(ctx.syms_cache);
ctx.syms_cache = NULL;
}
}
void global_syms_stat(FILE *fp)
{
if (ctx.syms_cache) {
obj__stat(fp);
syms_cache__stat(ctx.syms_cache, fp);
}
}
void function_resolver_ref(void)
{
global_syms_ref(true, false);
}
void function_resolver_unref(void)
{
global_syms_unref(true, false);
}
char *function_resolver(void *priv, unsigned long long *addrp, char **modp)
{
unsigned long addr = *(unsigned long *)addrp;
if (ctx.ksyms && addr >= START_OF_KERNEL) {
const struct ksym *ksym = ksyms__map_addr(ctx.ksyms, addr);
if (ksym) {
*addrp = ksym->addr;
return (char *)ksym->name;
}
}
return NULL;
}
static void callchain_ctx_debug_init(struct callchain_ctx *cc, bool kernel, bool user, FILE *fout)
{
cc->kernel = kernel;
cc->user = user;
cc->addr = 1;
cc->symbol = 1;
cc->offset = 1;
cc->dso = 1;
cc->reverse = 0;
cc->debug = 1;
cc->seperate = '\n';
cc->end = '\n';
cc->fout = fout;
}
struct callchain_ctx *callchain_ctx_new(int flags, FILE *fout)
{
struct callchain_ctx *cc;
bool kernel = flags & CALLCHAIN_KERNEL;
bool user = flags & CALLCHAIN_USER;
if (kernel == false && user == false)
return NULL;
if (global_syms_ref(kernel, user) < 0)
return NULL;
cc = calloc(1, sizeof(*cc));
if (!cc)
return NULL;
cc->kernel = kernel;
cc->user = user;
cc->addr = 1;
cc->symbol = 1;
cc->offset = 1;
cc->dso = 1;
cc->reverse = 0;
cc->seperate = '\n';
cc->end = '\n';
cc->fout = fout;
return cc;
}
void callchain_ctx_config(struct callchain_ctx *cc, bool addr, bool symbol, bool offset,
bool dso, bool reverse, char sep, char end)
{
if (!cc)
return ;
if (!(addr || symbol || offset || dso))
return ;
cc->addr = addr;
cc->symbol = symbol;
cc->offset = offset;
cc->dso = dso;
cc->reverse = reverse;
cc->seperate = sep;
cc->end = end;
}
void callchain_ctx_free(struct callchain_ctx *cc)
{
if (!cc)
return ;
global_syms_unref(cc->kernel, cc->user);
free(cc);
}
static void __print_callchain_kernel(struct callchain_ctx *cc, u64 ip, bool *printed)
{
int len = 0;
if (*printed)
len += fprintf(cc->fout, "%c", cc->seperate);
if (cc->print2string_kernel)
len += fprintf(cc->fout, "%s", (char *)ip);
else {
const struct ksym *ksym = cc->kernel ? ksyms__map_addr(ctx.ksyms, ip) : NULL;
len = 0;
if (cc->addr)
len += fprintf(cc->fout, " %016lx", ip);
if (cc->symbol) {
if (ksym || cc->addr) {
len += fprintf(cc->fout, "%s%s", len ? " " : "", ksym ? ksym->name : "Unknown");
if (cc->offset)
len += fprintf(cc->fout, "+0x%lx", ksym ? ip - ksym->addr : 0L);
} else // Symbol not found, print ip.
len += fprintf(cc->fout, "%016lx", ip);
}
if (cc->dso)
len += fprintf(cc->fout, "%s([kernel.kallsyms])", len ? " " : "");
}
if (len)
*printed = true;
}
static void __print_callchain_user(struct callchain_ctx *cc, struct syms *syms, u64 ip, bool *printed)
{
struct dso *dso = NULL;
const struct sym *sym = NULL;
const char *symbol = "Unknown";
u64 offset = 0L;
const char *dso_name = "Unknown";
int len = 0;
if (!cc->print2string_user && syms) {
dso = syms__find_dso(syms, ip, &offset);
if (dso) {
sym = dso__find_sym(dso, offset);
if (sym) {
symbol = sym->name;
offset = offset - sym->start;
dso_name = dso__name(dso)?:"Unknown";
}
}
}
if (*printed)
len += fprintf(cc->fout, "%c", cc->seperate);
if (cc->print2string_user)
len += fprintf(cc->fout, "%s", (char *)ip);
else {
len = 0;
if (cc->addr)
len += fprintf(cc->fout, " %016lx", ip);
if (cc->symbol) {
if (sym || cc->addr) {
len += fprintf(cc->fout, "%s%s", len ? " " : "", symbol);
if (cc->offset)
len += fprintf(cc->fout, "+0x%lx", offset);
} else // Symbol not found, print ip.
len += fprintf(cc->fout, "%016lx", ip);
}
if (cc->dso)
len += fprintf(cc->fout, "%s(%s)", len ? " " : "", dso_name);
}
if (len)
*printed = true;
}
static bool __print_callchain(struct callchain_ctx *cc, struct callchain *callchain, u32 pid)
{
u64 i;
bool kernel = false, user = false, printed = false;
struct syms *syms = NULL;
for (i = 0; i < callchain->nr; i++) {
u64 ip = callchain->ips[i];
if (ip == PERF_CONTEXT_KERNEL) {
kernel = true;
user = false;
continue;
} else if (ip == PERF_CONTEXT_USER) {
kernel = false;
user = true;
if (ctx.syms_cache && cc->user && !cc->print2string_user)
syms = syms_cache__get_syms(ctx.syms_cache, pid);
continue;
}
if (kernel) {
__print_callchain_kernel(cc, ip, &printed);
} else if (user) {
__print_callchain_user(cc, syms, ip, &printed);
}
}
return printed;
}
static bool __print_callchain_reverse(struct callchain_ctx *cc, struct callchain *callchain, u32 pid)
{
u64 i, kstart = 0, kend = 0, ustart = 0, uend = 0;
struct syms *syms = NULL;
bool printed = false;
for (i = 0; i < callchain->nr; i++) {
u64 ip = callchain->ips[i];
if (ip == PERF_CONTEXT_KERNEL) {
kstart = i + 1;
kend = callchain->nr - 1;
if (!cc->user)
break;
} else if (ip == PERF_CONTEXT_USER) {
if (ctx.syms_cache && cc->user && !cc->print2string_user)
syms = syms_cache__get_syms(ctx.syms_cache, pid);
kend = i - 1;
ustart = i + 1;
uend = callchain->nr - 1;
break;
}
}
if (ustart) {
for (; uend >= ustart; uend--) {
u64 ip = callchain->ips[uend];
// There may be more than 1 PERF_CONTEXT_* tag.
if (ip == PERF_CONTEXT_KERNEL ||
ip == PERF_CONTEXT_USER)
continue;
__print_callchain_user(cc, syms, ip, &printed);
}
}
if (kstart) {
for (; kend >= kstart; kend--) {
u64 ip = callchain->ips[kend];
// There may be more than 1 PERF_CONTEXT_* tag.
if (ip == PERF_CONTEXT_KERNEL ||
ip == PERF_CONTEXT_USER)
continue;
__print_callchain_kernel(cc, ip, &printed);
}
}
return printed;
}
void print_callchain(struct callchain_ctx *cc, struct callchain *callchain, u32 pid)
{
if (cc == NULL ||
callchain == NULL || callchain->nr == 0)
return ;
if (ctx.ksyms == NULL &&
ctx.syms_cache == NULL)
return ;
if ((cc->reverse ? __print_callchain_reverse : __print_callchain)(cc, callchain, pid))
fprintf(cc->fout, "%c", cc->end);
}
void print_callchain_common_cbs(struct callchain_ctx *cc, struct callchain *callchain, u32 pid,
callchain_cbs kernel_cb, callchain_cbs user_cb, void *opaque)
{
__u64 i;
bool kernel = false, user = false;
struct syms *syms = NULL;
if (cc == NULL ||
callchain == NULL || callchain->nr == 0)
return ;
if (ctx.ksyms == NULL &&
ctx.syms_cache == NULL)
return ;
for (i = 0; i < callchain->nr; i++) {
__u64 ip = callchain->ips[i];
if (ip == PERF_CONTEXT_KERNEL) {
kernel = true;
user = false;
if (kernel_cb)
kernel_cb(opaque, PERF_CONTEXT_KERNEL);
if (cc->debug)
fprintf(cc->fout, " %016llx PERF_CONTEXT_KERNEL\n", ip);
continue;
} else if (ip == PERF_CONTEXT_USER) {
kernel = false;
user = true;
if (ctx.syms_cache && cc->user) {
syms = syms_cache__get_syms(ctx.syms_cache, pid);
}
if (user_cb)
user_cb(opaque, PERF_CONTEXT_USER);
if (cc->debug)
fprintf(cc->fout, " %016llx PERF_CONTEXT_USER\n", ip);
continue;
}
if (kernel) {
const struct ksym *ksym = cc->kernel ? ksyms__map_addr(ctx.ksyms, ip) : NULL;
fprintf(cc->fout, " %016llx %s+0x%llx ([kernel.kallsyms])\n", ip, ksym ? ksym->name : "Unknown",
ksym ? ip - ksym->addr : 0L);
} else if (user) {
struct dso *dso = NULL;
uint64_t offset;
if (syms)
dso = syms__find_dso(syms, ip, &offset);
if (dso) {
const struct sym *sym = dso__find_sym(dso, offset);
fprintf(cc->fout, " %016llx %s+0x%lx (%s)\n", ip, sym ? sym->name : "Unknown",
sym ? offset - sym->start : 0L, dso__name(dso)?:"Unknown");
} else
fprintf(cc->fout, " %016llx Unknown\n", ip);
} else
fprintf(cc->fout, " %016llx\n", ip);
}
}
void print_callchain_common(struct callchain_ctx *cc, struct callchain *callchain, u32 pid)
{
print_callchain_common_cbs(cc, callchain, pid, NULL, NULL, NULL);
}
static void print2string_callchain(struct callchain_ctx *cc, struct callchain *callchain, u32 pid,
int *context_kernel_num, int *context_user_num)
{
__u64 i;
bool kernel = false, user = false;
struct syms *syms = NULL;
char buff[1024];
int len = 0;
if (cc == NULL ||
callchain == NULL || callchain->nr == 0)
return ;
if (!cc->print2string_kernel && !cc->print2string_user)
return ;
if (ctx.ksyms == NULL &&
ctx.syms_cache == NULL)
return ;
*context_kernel_num = 0;
*context_user_num = 0;
for (i = 0; i < callchain->nr; i++) {
u64 ip = callchain->ips[i];
if (ip == PERF_CONTEXT_KERNEL) {
kernel = true;
user = false;
if (i + 1 < callchain->nr)
(*context_kernel_num) ++;
continue;
} else if (ip == PERF_CONTEXT_USER) {
kernel = false;
user = true;
if (ctx.syms_cache && cc->user) {
syms = syms_cache__get_syms(ctx.syms_cache, pid);
}
if (i + 1 < callchain->nr)
(*context_user_num) ++;
continue;
}
if (kernel && cc->print2string_kernel) {
const struct ksym *ksym = cc->kernel ? ksyms__map_addr(ctx.ksyms, ip) : NULL;
len = 0;
if (cc->addr)
len += snprintf(buff+len, sizeof(buff)-len, " %016lx", ip);
if (cc->symbol) {
len += snprintf(buff+len, sizeof(buff)-len, "%s%s", len ? " " : "", ksym ? ksym->name : "Unknown");
if (cc->offset)
len += snprintf(buff+len, sizeof(buff)-len, "+0x%lx", ksym ? ip - ksym->addr : 0L);
}
if (cc->dso)
len += snprintf(buff+len, sizeof(buff)-len, "%s([kernel.kallsyms])", len ? " " : "");
// Convert to unique string.
callchain->ips[i] = (__u64)(void *)unique_string(buff);
} else if (user && cc->print2string_user) {
struct dso *dso;
const char *symbol = "Unknown";
u64 offset = 0L;
const char *dso_name = "Unknown";
if (syms) {
dso = syms__find_dso(syms, ip, &offset);
if (dso) {
const struct sym *sym = dso__find_sym(dso, offset);
if (sym) {
symbol = sym->name;
offset = offset - sym->start;
dso_name = dso__name(dso)?:"Unknown";
}
}
}
len = 0;
if (cc->addr)
len += snprintf(buff+len, sizeof(buff)-len, " %016lx", ip);
if (cc->symbol) {
len += snprintf(buff+len, sizeof(buff)-len, "%s%s", len ? " " : "", symbol);
if (cc->offset)
len += snprintf(buff+len, sizeof(buff)-len, "+0x%lx", offset);
}
if (cc->dso)
len += snprintf(buff+len, sizeof(buff)-len, "%s(%s)", len ? " " : "", dso_name);
// Convert to unique string.
callchain->ips[i] = (__u64)(void *)unique_string(buff);
}
}
}
struct key_value {
/* void *value;
* The value is placed at the beginning of the key_value structure, and the
* key_value pointer and the value pointer can be converted to each other.
*
* void *value = (void *)(struct key_value *)kv - pairs->value_size;
* struct key_value *kv = (void *)value + pairs->value_size;
*/
struct rb_node rbnode;
unsigned int n;
struct_key key;
};
struct key_value_paires {
struct rblist kv_pairs;
int value_size;
};
static int key_value_node_cmp(struct rb_node *rbn, const void *entry)
{
struct key_value *kv = container_of(rbn, struct key_value, rbnode);
const struct_key *key = entry;
int i = 0, j = 0;
/*
* In the flame_graph_add_callchain function, the PERF_CONTEXT_FLAME_GRAPH
* will be added, which can be sorted by time(ips[1]).
**/
for (; i < (int)kv->key.nr && j < (int)key->nr; i++, j++) {
if (kv->key.ips[i] > key->ips[j])
return 1;
else if (kv->key.ips[i] < key->ips[j])
return -1;
}
return (int)kv->key.nr - (int)key->nr;
}
static struct rb_node *key_value_node_new(struct rblist *rlist, const void *new_entry)
{
struct key_value_paires *pairs = container_of(rlist, struct key_value_paires, kv_pairs);
const struct_key *key = new_entry;
void *value = malloc(pairs->value_size + sizeof(struct key_value) + key->nr * sizeof(key->ips[0]));
if (value) {
struct key_value *kv = value + pairs->value_size;
RB_CLEAR_NODE(&kv->rbnode);
kv->n = 0;
kv->key.nr = key->nr;
memcpy(kv->key.ips, key->ips, key->nr * sizeof(key->ips[0]));
memset(value, 0, pairs->value_size);
return &kv->rbnode;
} else
return NULL;
}
static void key_value_node_delete(struct rblist *rblist, struct rb_node *rb_node)
{
struct key_value_paires *pairs = container_of(rblist, struct key_value_paires, kv_pairs);
struct key_value *kv = container_of(rb_node, struct key_value, rbnode);
void *value = (void *)kv - pairs->value_size;
free(value);
}
struct key_value_paires *keyvalue_pairs_new(int value_size)
{
struct key_value_paires *pairs;
pairs = calloc(1, sizeof(*pairs));
if (!pairs)
return NULL;
rblist__init(&pairs->kv_pairs);
pairs->kv_pairs.node_cmp = key_value_node_cmp;
pairs->kv_pairs.node_new = key_value_node_new;
pairs->kv_pairs.node_delete = key_value_node_delete;
pairs->value_size = ALIGN(value_size, 8);
return pairs;
}
void keyvalue_pairs_free(struct key_value_paires *pairs)
{
if (!pairs)
return ;
rblist__exit(&pairs->kv_pairs);
free(pairs);
}
void *keyvalue_pairs_add_key(struct key_value_paires *pairs, struct_key *key)
{
struct rb_node *rbn;
struct key_value *kv = NULL;
void *value = NULL;
if (!pairs)
return NULL;
rbn = rblist__findnew(&pairs->kv_pairs, key);
if (rbn) {
kv = container_of(rbn, struct key_value, rbnode);
kv->n ++;
value = pairs->value_size ? (void *)kv - pairs->value_size : NULL;
}
return value;
}
void keyvalue_pairs_foreach(struct key_value_paires *pairs, foreach_keyvalue f, void *opaque)
{
struct rblist *rblist;
struct rb_node *pos, *next;
struct key_value *kv = NULL;
void *value = NULL;
if (!pairs)
return ;
rblist = &pairs->kv_pairs;
next = rb_first_cached(&rblist->entries);
while (next) {
pos = next;
next = rb_next(pos);
kv = container_of(pos, struct key_value, rbnode);
value = pairs->value_size ? (void *)kv - pairs->value_size : NULL;
f(opaque, &kv->key, value, kv->n);
}
}
void keyvalue_pairs_sorted_firstn(struct key_value_paires *pairs, keyvalue_cmp cmp, foreach_keyvalue f, void *opaque, unsigned int n)
{
struct rblist *rblist;
struct rb_node *pos, *next;
struct key_value *kv = NULL;
void *value = NULL;
void **sorted_values = NULL;
unsigned int nr = 0, i;
if (!pairs || rblist__empty(&pairs->kv_pairs))
return;
if (pairs->value_size == 0)
return keyvalue_pairs_foreach(pairs, f, opaque);
rblist = &pairs->kv_pairs;
next = rb_first_cached(&rblist->entries);
sorted_values = calloc(rblist__nr_entries(rblist), sizeof(*sorted_values));
if (!sorted_values)
return;
while (next) {
pos = next;
next = rb_next(pos);
kv = container_of(pos, struct key_value, rbnode);
value = (void *)kv - pairs->value_size;
sorted_values[nr++] = value;
}
qsort(sorted_values, nr, sizeof(*sorted_values), (__compar_fn_t)cmp);
if (n && nr > n)
nr = n;
for (i = 0; i < nr; i++) {
value = sorted_values[i];
kv = value + pairs->value_size;
f(opaque, &kv->key, value, kv->n);
}
free(sorted_values);
}
void keyvalue_pairs_sorted_foreach(struct key_value_paires *pairs, keyvalue_cmp cmp, foreach_keyvalue f, void *opaque)
{
keyvalue_pairs_sorted_firstn(pairs, cmp, f, opaque, 0);
}
void keyvalue_pairs_reinit(struct key_value_paires *pairs)
{
if (pairs) {
rblist__exit(&pairs->kv_pairs);
}
}
unsigned int keyvalue_pairs_nr_entries(struct key_value_paires *pairs)
{
if (pairs)
return rblist__nr_entries(&pairs->kv_pairs);
else
return 0;
}
static bool keyvalue_pairs_empty(struct key_value_paires *pairs)
{
return !pairs || rblist__empty(&pairs->kv_pairs);
}
struct unique_string {
struct rb_node rbnode;
unsigned int n, len;
char str[0];
};
static int unique_string_node_cmp(struct rb_node *rbn, const void *entry)
{
struct unique_string *s = container_of(rbn, struct unique_string, rbnode);
const char *str = entry;
return strcmp(s->str, str);
}
static struct rb_node *unique_string_node_new(struct rblist *rlist, const void *new_entry)
{
const char *str = new_entry;
unsigned int len = strlen(str) + 1;
struct unique_string *s = malloc(sizeof(struct unique_string) + len);
if (s) {
RB_CLEAR_NODE(&s->rbnode);
s->n = 0;
s->len = len;
strcpy(s->str, str);
return &s->rbnode;
} else
return NULL;
}
static void unique_string_node_delete(struct rblist *rblist, struct rb_node *rb_node)
{
struct unique_string *s = container_of(rb_node, struct unique_string, rbnode);
free(s);
}
static struct rblist unique_strings = {
.entries = RB_ROOT_CACHED,
.nr_entries = 0,
.node_cmp = unique_string_node_cmp,
.node_new = unique_string_node_new,
.node_delete = unique_string_node_delete,
};
const char *unique_string(const char *str)
{
struct rb_node *rbn;
struct unique_string *s = NULL;
rbn = rblist__findnew(&unique_strings, str);
if (rbn) {
s = container_of(rbn, struct unique_string, rbnode);
s->n ++;
return s->str;
}
return NULL;
}
void unique_string_stat(FILE *fp)
{
struct rb_node *pos, *next = rb_first_cached(&unique_strings.entries);
struct unique_string *s = NULL;
size_t str_len = 0, node_len = 0;
while (next) {
pos = next;
next = rb_next(pos);
s = container_of(pos, struct unique_string, rbnode);
str_len += s->len * s->n;
node_len += sizeof(*s);
}
fprintf(fp, "UNIQUE STRING STAT: strlen %lu, nodelen %lu\n", str_len, node_len);
}
struct flame_graph {
struct callchain_ctx *cc;
struct key_value_paires *kv_pairs;
char *filename;
bool special;
};
static inline bool special_file(mode_t mode)
{
return S_ISCHR(mode) || S_ISBLK(mode) || S_ISFIFO(mode) || S_ISSOCK(mode);
}
struct flame_graph *flame_graph_new(int flags, FILE *fout)
{
struct flame_graph *fg = malloc(sizeof(*fg));
struct callchain_ctx *cc = callchain_ctx_new(flags, fout);
struct key_value_paires *kv_pairs = keyvalue_pairs_new(0);
struct stat buf;
if (!fg || !cc || !kv_pairs) {
free(fg);
callchain_ctx_free(cc);
keyvalue_pairs_free(kv_pairs);
return NULL;
}
if (fstat(fileno(fout), &buf) == 0 &&
special_file(buf.st_mode)) {
fg->special = true;
cc->addr = 0;
cc->symbol = 1;
cc->offset = 1;
cc->dso = 0;
cc->reverse = 0;
cc->seperate = '\n';
cc->end = '\n';
} else {
fg->special = false;
cc->addr = 0;
cc->symbol = 1;
cc->offset = 0;
cc->dso = 0;
cc->reverse = 1;
cc->seperate = ';';
cc->end = ' ';
}
cc->print2string_kernel = 1;
cc->print2string_user = 1;
fg->cc = cc;
fg->kv_pairs = kv_pairs;
return fg;
}
void flame_graph_free(struct flame_graph *fg)
{
if (!fg)
return ;
callchain_ctx_free(fg->cc);
keyvalue_pairs_free(fg->kv_pairs);
free(fg);
}
void flame_graph_add_callchain_at_time(struct flame_graph *fg, struct callchain *callchain,
u32 pid, const char *comm,
u64 time, const char *time_str)
{
struct {
__u64 nr;
__u64 ips[PERF_MAX_STACK_DEPTH + PERF_MAX_CONTEXTS_PER_STACK + 5];
} key;
char buff[128];
int context_kernel_num = 0;
int context_user_num = 0;
if (!fg)
return ;
key.nr = 0;
/*
* The time is placed at the front of the stack.
* 1. The flame graph can be sorted by time.
* 2. The print_callchain function is not affected.
**/
if (time) {
key.ips[key.nr++] = PERF_CONTEXT_FLAME_GRAPH;
key.ips[key.nr++] = time;
}
memcpy(&key.ips[key.nr], callchain->ips, callchain->nr * sizeof(callchain->ips[0]));
key.nr += callchain->nr;
/*
* convert callchain to unique string.
* For user-mode stacks, symbols are freed after the process exits. Therefore,
* the stack needs to be converted into a unique string first.
**/
print2string_callchain(fg->cc, (struct callchain *)&key, pid, &context_kernel_num, &context_user_num);
// callchain empty
if (context_kernel_num + context_user_num == callchain->nr) {
return;
}
/*
* There may be more than 1 PERF_CONTEXT_* tag. So, pre-print the error message.
**/
if (context_kernel_num > 1 || context_user_num > 1) {
struct callchain_ctx debug;
callchain_ctx_debug_init(&debug, fg->cc->kernel, fg->cc->user, stderr);
print_time(stderr);
fprintf(stderr, "BUG: callchain error%s%s\n",
context_kernel_num > 1 ? " PERF_CONTEXT_KERNEL >1" : "",
context_user_num > 1 ? " PERF_CONTEXT_USER >1" : "");
print_callchain_common(&debug, callchain, pid);
}
if (fg->cc->user && fg->cc->print2string_user) {
/*
* There is no user-mode stack in callchain, add PERF_CONTEXT_USER isolates
* the user-mode and kernel-mode stacks.
**/
if (!context_user_num) {
key.ips[key.nr++] = PERF_CONTEXT_USER;
context_user_num++;
}
if (comm)
snprintf(buff, sizeof(buff), "%s", comm);
else
snprintf(buff, sizeof(buff), "%d", pid);
key.ips[key.nr++] = (__u64)(void *)unique_string(buff);
}
if (time && time_str) {
if (!context_user_num) {
key.ips[key.nr++] = PERF_CONTEXT_USER;
context_user_num++;
}
key.ips[key.nr++] = (__u64)(void *)unique_string(time_str);
}
/*
* Add to the storage pool with the stack as the key.
**/
keyvalue_pairs_add_key(fg->kv_pairs, (struct_key *)&key);
}
static void __flame_graph_print(void *opaque, struct_key *key, void *value, unsigned int n)
{
struct flame_graph *fg = opaque;
print_callchain(fg->cc, key, 0);
fprintf(fg->cc->fout, "%u\n", n);
}
void flame_graph_output(struct flame_graph *fg)
{
if (!fg)
return ;
keyvalue_pairs_foreach(fg->kv_pairs, __flame_graph_print, fg);
}
struct flame_graph *flame_graph_open(int flags, const char *path)
{
char filename[PATH_MAX];
FILE *fp;
struct flame_graph *fg;
struct stat buf;
bool special = false;
if (!path)
return NULL;
if (stat(path, &buf) == 0 &&
special_file(buf.st_mode)) {
special = true;
goto _open;
}
snprintf(filename, sizeof(filename), "%s.folded", path);
if (access(filename, F_OK) == 0) {
char filename_old[PATH_MAX];
snprintf(filename_old, sizeof(filename_old), "%s.folded.old", path);
rename(filename, filename_old);
}
_open:
fp = fopen(special ? path : filename, "w+");
if (!fp)
return NULL;
fg = flame_graph_new(flags, fp);
if (fg)
fg->filename = strdup(path);
return fg;
}
void flame_graph_close(struct flame_graph *fg)
{
FILE *fp;
if (!fg)
return ;
if (!fg->special && !keyvalue_pairs_empty(fg->kv_pairs)) {
printf("To generate the flame graph, running THIS shell command:\n");
printf("\n flamegraph.pl %s.folded > %s.svg\n\n", fg->filename, fg->filename);
}
fp = fg->cc->fout;
free(fg->filename);
flame_graph_free(fg);
fclose(fp);
}
void flame_graph_reset(struct flame_graph *fg)
{
if (!fg)
return ;
rblist__exit(&fg->kv_pairs->kv_pairs);
}
struct heatmap {
const char *time_units; //"s", "ms", "us", "ns"
const char *latency_units; //"s", "ms", "us", "ns"
char *filename;
FILE *fp;
};
struct heatmap *heatmap_open(const char *time_uints, const char *latency_units, const char *path)
{
char filename[PATH_MAX];
FILE *fp;
struct heatmap *heatmap;
if (!path)