diff options
Diffstat (limited to 'tools/perf/util/callchain.c')
| -rw-r--r-- | tools/perf/util/callchain.c | 1724 |
1 files changed, 1724 insertions, 0 deletions
diff --git a/tools/perf/util/callchain.c b/tools/perf/util/callchain.c new file mode 100644 index 000000000..a093a15f0 --- /dev/null +++ b/tools/perf/util/callchain.c @@ -0,0 +1,1724 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Copyright (C) 2009-2011, Frederic Weisbecker <fweisbec@gmail.com> + * + * Handle the callchains from the stream in an ad-hoc radix tree and then + * sort them in an rbtree. + * + * Using a radix for code path provides a fast retrieval and factorizes + * memory use. Also that lets us use the paths in a hierarchical graph view. + * + */ + +#include <inttypes.h> +#include <stdlib.h> +#include <stdio.h> +#include <stdbool.h> +#include <errno.h> +#include <math.h> +#include <linux/string.h> +#include <linux/zalloc.h> + +#include "asm/bug.h" + +#include "debug.h" +#include "dso.h" +#include "event.h" +#include "hist.h" +#include "sort.h" +#include "machine.h" +#include "map.h" +#include "callchain.h" +#include "branch.h" +#include "symbol.h" +#include "util.h" +#include "../perf.h" + +#define CALLCHAIN_PARAM_DEFAULT \ + .mode = CHAIN_GRAPH_ABS, \ + .min_percent = 0.5, \ + .order = ORDER_CALLEE, \ + .key = CCKEY_FUNCTION, \ + .value = CCVAL_PERCENT, \ + +struct callchain_param callchain_param = { + CALLCHAIN_PARAM_DEFAULT +}; + +/* + * Are there any events usind DWARF callchains? + * + * I.e. + * + * -e cycles/call-graph=dwarf/ + */ +bool dwarf_callchain_users; + +struct callchain_param callchain_param_default = { + CALLCHAIN_PARAM_DEFAULT +}; + +__thread struct callchain_cursor callchain_cursor; + +int parse_callchain_record_opt(const char *arg, struct callchain_param *param) +{ + return parse_callchain_record(arg, param); +} + +static int parse_callchain_mode(const char *value) +{ + if (!strncmp(value, "graph", strlen(value))) { + callchain_param.mode = CHAIN_GRAPH_ABS; + return 0; + } + if (!strncmp(value, "flat", strlen(value))) { + callchain_param.mode = CHAIN_FLAT; + return 0; + } + if (!strncmp(value, "fractal", strlen(value))) { + callchain_param.mode = CHAIN_GRAPH_REL; + return 0; + } + if (!strncmp(value, "folded", strlen(value))) { + callchain_param.mode = CHAIN_FOLDED; + return 0; + } + return -1; +} + +static int parse_callchain_order(const char *value) +{ + if (!strncmp(value, "caller", strlen(value))) { + callchain_param.order = ORDER_CALLER; + callchain_param.order_set = true; + return 0; + } + if (!strncmp(value, "callee", strlen(value))) { + callchain_param.order = ORDER_CALLEE; + callchain_param.order_set = true; + return 0; + } + return -1; +} + +static int parse_callchain_sort_key(const char *value) +{ + if (!strncmp(value, "function", strlen(value))) { + callchain_param.key = CCKEY_FUNCTION; + return 0; + } + if (!strncmp(value, "address", strlen(value))) { + callchain_param.key = CCKEY_ADDRESS; + return 0; + } + if (!strncmp(value, "srcline", strlen(value))) { + callchain_param.key = CCKEY_SRCLINE; + return 0; + } + if (!strncmp(value, "branch", strlen(value))) { + callchain_param.branch_callstack = 1; + return 0; + } + return -1; +} + +static int parse_callchain_value(const char *value) +{ + if (!strncmp(value, "percent", strlen(value))) { + callchain_param.value = CCVAL_PERCENT; + return 0; + } + if (!strncmp(value, "period", strlen(value))) { + callchain_param.value = CCVAL_PERIOD; + return 0; + } + if (!strncmp(value, "count", strlen(value))) { + callchain_param.value = CCVAL_COUNT; + return 0; + } + return -1; +} + +static int get_stack_size(const char *str, unsigned long *_size) +{ + char *endptr; + unsigned long size; + unsigned long max_size = round_down(USHRT_MAX, sizeof(u64)); + + size = strtoul(str, &endptr, 0); + + do { + if (*endptr) + break; + + size = round_up(size, sizeof(u64)); + if (!size || size > max_size) + break; + + *_size = size; + return 0; + + } while (0); + + pr_err("callchain: Incorrect stack dump size (max %ld): %s\n", + max_size, str); + return -1; +} + +static int +__parse_callchain_report_opt(const char *arg, bool allow_record_opt) +{ + char *tok; + char *endptr, *saveptr = NULL; + bool minpcnt_set = false; + bool record_opt_set = false; + bool try_stack_size = false; + + callchain_param.enabled = true; + symbol_conf.use_callchain = true; + + if (!arg) + return 0; + + while ((tok = strtok_r((char *)arg, ",", &saveptr)) != NULL) { + if (!strncmp(tok, "none", strlen(tok))) { + callchain_param.mode = CHAIN_NONE; + callchain_param.enabled = false; + symbol_conf.use_callchain = false; + return 0; + } + + if (!parse_callchain_mode(tok) || + !parse_callchain_order(tok) || + !parse_callchain_sort_key(tok) || + !parse_callchain_value(tok)) { + /* parsing ok - move on to the next */ + try_stack_size = false; + goto next; + } else if (allow_record_opt && !record_opt_set) { + if (parse_callchain_record(tok, &callchain_param)) + goto try_numbers; + + /* assume that number followed by 'dwarf' is stack size */ + if (callchain_param.record_mode == CALLCHAIN_DWARF) + try_stack_size = true; + + record_opt_set = true; + goto next; + } + +try_numbers: + if (try_stack_size) { + unsigned long size = 0; + + if (get_stack_size(tok, &size) < 0) + return -1; + callchain_param.dump_size = size; + try_stack_size = false; + } else if (!minpcnt_set) { + /* try to get the min percent */ + callchain_param.min_percent = strtod(tok, &endptr); + if (tok == endptr) + return -1; + minpcnt_set = true; + } else { + /* try print limit at last */ + callchain_param.print_limit = strtoul(tok, &endptr, 0); + if (tok == endptr) + return -1; + } +next: + arg = NULL; + } + + if (callchain_register_param(&callchain_param) < 0) { + pr_err("Can't register callchain params\n"); + return -1; + } + return 0; +} + +int parse_callchain_report_opt(const char *arg) +{ + return __parse_callchain_report_opt(arg, false); +} + +int parse_callchain_top_opt(const char *arg) +{ + return __parse_callchain_report_opt(arg, true); +} + +int parse_callchain_record(const char *arg, struct callchain_param *param) +{ + char *tok, *name, *saveptr = NULL; + char *buf; + int ret = -1; + + /* We need buffer that we know we can write to. */ + buf = malloc(strlen(arg) + 1); + if (!buf) + return -ENOMEM; + + strcpy(buf, arg); + + tok = strtok_r((char *)buf, ",", &saveptr); + name = tok ? : (char *)buf; + + do { + /* Framepointer style */ + if (!strncmp(name, "fp", sizeof("fp"))) { + ret = 0; + param->record_mode = CALLCHAIN_FP; + + tok = strtok_r(NULL, ",", &saveptr); + if (tok) { + unsigned long size; + + size = strtoul(tok, &name, 0); + if (size < (unsigned) sysctl__max_stack()) + param->max_stack = size; + } + break; + + /* Dwarf style */ + } else if (!strncmp(name, "dwarf", sizeof("dwarf"))) { + const unsigned long default_stack_dump_size = 8192; + + ret = 0; + param->record_mode = CALLCHAIN_DWARF; + param->dump_size = default_stack_dump_size; + dwarf_callchain_users = true; + + tok = strtok_r(NULL, ",", &saveptr); + if (tok) { + unsigned long size = 0; + + ret = get_stack_size(tok, &size); + param->dump_size = size; + } + } else if (!strncmp(name, "lbr", sizeof("lbr"))) { + if (!strtok_r(NULL, ",", &saveptr)) { + param->record_mode = CALLCHAIN_LBR; + ret = 0; + } else + pr_err("callchain: No more arguments " + "needed for --call-graph lbr\n"); + break; + } else { + pr_err("callchain: Unknown --call-graph option " + "value: %s\n", arg); + break; + } + + } while (0); + + free(buf); + return ret; +} + +int perf_callchain_config(const char *var, const char *value) +{ + char *endptr; + + if (!strstarts(var, "call-graph.")) + return 0; + var += sizeof("call-graph.") - 1; + + if (!strcmp(var, "record-mode")) + return parse_callchain_record_opt(value, &callchain_param); + if (!strcmp(var, "dump-size")) { + unsigned long size = 0; + int ret; + + ret = get_stack_size(value, &size); + callchain_param.dump_size = size; + + return ret; + } + if (!strcmp(var, "print-type")){ + int ret; + ret = parse_callchain_mode(value); + if (ret == -1) + pr_err("Invalid callchain mode: %s\n", value); + return ret; + } + if (!strcmp(var, "order")){ + int ret; + ret = parse_callchain_order(value); + if (ret == -1) + pr_err("Invalid callchain order: %s\n", value); + return ret; + } + if (!strcmp(var, "sort-key")){ + int ret; + ret = parse_callchain_sort_key(value); + if (ret == -1) + pr_err("Invalid callchain sort key: %s\n", value); + return ret; + } + if (!strcmp(var, "threshold")) { + callchain_param.min_percent = strtod(value, &endptr); + if (value == endptr) { + pr_err("Invalid callchain threshold: %s\n", value); + return -1; + } + } + if (!strcmp(var, "print-limit")) { + callchain_param.print_limit = strtod(value, &endptr); + if (value == endptr) { + pr_err("Invalid callchain print limit: %s\n", value); + return -1; + } + } + + return 0; +} + +static void +rb_insert_callchain(struct rb_root *root, struct callchain_node *chain, + enum chain_mode mode) +{ + struct rb_node **p = &root->rb_node; + struct rb_node *parent = NULL; + struct callchain_node *rnode; + u64 chain_cumul = callchain_cumul_hits(chain); + + while (*p) { + u64 rnode_cumul; + + parent = *p; + rnode = rb_entry(parent, struct callchain_node, rb_node); + rnode_cumul = callchain_cumul_hits(rnode); + + switch (mode) { + case CHAIN_FLAT: + case CHAIN_FOLDED: + if (rnode->hit < chain->hit) + p = &(*p)->rb_left; + else + p = &(*p)->rb_right; + break; + case CHAIN_GRAPH_ABS: /* Falldown */ + case CHAIN_GRAPH_REL: + if (rnode_cumul < chain_cumul) + p = &(*p)->rb_left; + else + p = &(*p)->rb_right; + break; + case CHAIN_NONE: + default: + break; + } + } + + rb_link_node(&chain->rb_node, parent, p); + rb_insert_color(&chain->rb_node, root); +} + +static void +__sort_chain_flat(struct rb_root *rb_root, struct callchain_node *node, + u64 min_hit) +{ + struct rb_node *n; + struct callchain_node *child; + + n = rb_first(&node->rb_root_in); + while (n) { + child = rb_entry(n, struct callchain_node, rb_node_in); + n = rb_next(n); + + __sort_chain_flat(rb_root, child, min_hit); + } + + if (node->hit && node->hit >= min_hit) + rb_insert_callchain(rb_root, node, CHAIN_FLAT); +} + +/* + * Once we get every callchains from the stream, we can now + * sort them by hit + */ +static void +sort_chain_flat(struct rb_root *rb_root, struct callchain_root *root, + u64 min_hit, struct callchain_param *param __maybe_unused) +{ + *rb_root = RB_ROOT; + __sort_chain_flat(rb_root, &root->node, min_hit); +} + +static void __sort_chain_graph_abs(struct callchain_node *node, + u64 min_hit) +{ + struct rb_node *n; + struct callchain_node *child; + + node->rb_root = RB_ROOT; + n = rb_first(&node->rb_root_in); + + while (n) { + child = rb_entry(n, struct callchain_node, rb_node_in); + n = rb_next(n); + + __sort_chain_graph_abs(child, min_hit); + if (callchain_cumul_hits(child) >= min_hit) + rb_insert_callchain(&node->rb_root, child, + CHAIN_GRAPH_ABS); + } +} + +static void +sort_chain_graph_abs(struct rb_root *rb_root, struct callchain_root *chain_root, + u64 min_hit, struct callchain_param *param __maybe_unused) +{ + __sort_chain_graph_abs(&chain_root->node, min_hit); + rb_root->rb_node = chain_root->node.rb_root.rb_node; +} + +static void __sort_chain_graph_rel(struct callchain_node *node, + double min_percent) +{ + struct rb_node *n; + struct callchain_node *child; + u64 min_hit; + + node->rb_root = RB_ROOT; + min_hit = ceil(node->children_hit * min_percent); + + n = rb_first(&node->rb_root_in); + while (n) { + child = rb_entry(n, struct callchain_node, rb_node_in); + n = rb_next(n); + + __sort_chain_graph_rel(child, min_percent); + if (callchain_cumul_hits(child) >= min_hit) + rb_insert_callchain(&node->rb_root, child, + CHAIN_GRAPH_REL); + } +} + +static void +sort_chain_graph_rel(struct rb_root *rb_root, struct callchain_root *chain_root, + u64 min_hit __maybe_unused, struct callchain_param *param) +{ + __sort_chain_graph_rel(&chain_root->node, param->min_percent / 100.0); + rb_root->rb_node = chain_root->node.rb_root.rb_node; +} + +int callchain_register_param(struct callchain_param *param) +{ + switch (param->mode) { + case CHAIN_GRAPH_ABS: + param->sort = sort_chain_graph_abs; + break; + case CHAIN_GRAPH_REL: + param->sort = sort_chain_graph_rel; + break; + case CHAIN_FLAT: + case CHAIN_FOLDED: + param->sort = sort_chain_flat; + break; + case CHAIN_NONE: + default: + return -1; + } + return 0; +} + +/* + * Create a child for a parent. If inherit_children, then the new child + * will become the new parent of it's parent children + */ +static struct callchain_node * +create_child(struct callchain_node *parent, bool inherit_children) +{ + struct callchain_node *new; + + new = zalloc(sizeof(*new)); + if (!new) { + perror("not enough memory to create child for code path tree"); + return NULL; + } + new->parent = parent; + INIT_LIST_HEAD(&new->val); + INIT_LIST_HEAD(&new->parent_val); + + if (inherit_children) { + struct rb_node *n; + struct callchain_node *child; + + new->rb_root_in = parent->rb_root_in; + parent->rb_root_in = RB_ROOT; + + n = rb_first(&new->rb_root_in); + while (n) { + child = rb_entry(n, struct callchain_node, rb_node_in); + child->parent = new; + n = rb_next(n); + } + + /* make it the first child */ + rb_link_node(&new->rb_node_in, NULL, &parent->rb_root_in.rb_node); + rb_insert_color(&new->rb_node_in, &parent->rb_root_in); + } + + return new; +} + + +/* + * Fill the node with callchain values + */ +static int +fill_node(struct callchain_node *node, struct callchain_cursor *cursor) +{ + struct callchain_cursor_node *cursor_node; + + node->val_nr = cursor->nr - cursor->pos; + if (!node->val_nr) + pr_warning("Warning: empty node in callchain tree\n"); + + cursor_node = callchain_cursor_current(cursor); + + while (cursor_node) { + struct callchain_list *call; + + call = zalloc(sizeof(*call)); + if (!call) { + perror("not enough memory for the code path tree"); + return -1; + } + call->ip = cursor_node->ip; + call->ms = cursor_node->ms; + map__get(call->ms.map); + call->srcline = cursor_node->srcline; + + if (cursor_node->branch) { + call->branch_count = 1; + + if (cursor_node->branch_from) { + /* + * branch_from is set with value somewhere else + * to imply it's "to" of a branch. + */ + call->brtype_stat.branch_to = true; + + if (cursor_node->branch_flags.predicted) + call->predicted_count = 1; + + if (cursor_node->branch_flags.abort) + call->abort_count = 1; + + branch_type_count(&call->brtype_stat, + &cursor_node->branch_flags, + cursor_node->branch_from, + cursor_node->ip); + } else { + /* + * It's "from" of a branch + */ + call->brtype_stat.branch_to = false; + call->cycles_count = + cursor_node->branch_flags.cycles; + call->iter_count = cursor_node->nr_loop_iter; + call->iter_cycles = cursor_node->iter_cycles; + } + } + + list_add_tail(&call->list, &node->val); + + callchain_cursor_advance(cursor); + cursor_node = callchain_cursor_current(cursor); + } + return 0; +} + +static struct callchain_node * +add_child(struct callchain_node *parent, + struct callchain_cursor *cursor, + u64 period) +{ + struct callchain_node *new; + + new = create_child(parent, false); + if (new == NULL) + return NULL; + + if (fill_node(new, cursor) < 0) { + struct callchain_list *call, *tmp; + + list_for_each_entry_safe(call, tmp, &new->val, list) { + list_del_init(&call->list); + map__zput(call->ms.map); + free(call); + } + free(new); + return NULL; + } + + new->children_hit = 0; + new->hit = period; + new->children_count = 0; + new->count = 1; + return new; +} + +enum match_result { + MATCH_ERROR = -1, + MATCH_EQ, + MATCH_LT, + MATCH_GT, +}; + +static enum match_result match_chain_strings(const char *left, + const char *right) +{ + enum match_result ret = MATCH_EQ; + int cmp; + + if (left && right) + cmp = strcmp(left, right); + else if (!left && right) + cmp = 1; + else if (left && !right) + cmp = -1; + else + return MATCH_ERROR; + + if (cmp != 0) + ret = cmp < 0 ? MATCH_LT : MATCH_GT; + + return ret; +} + +/* + * We need to always use relative addresses because we're aggregating + * callchains from multiple threads, i.e. different address spaces, so + * comparing absolute addresses make no sense as a symbol in a DSO may end up + * in a different address when used in a different binary or even the same + * binary but with some sort of address randomization technique, thus we need + * to compare just relative addresses. -acme + */ +static enum match_result match_chain_dso_addresses(struct map *left_map, u64 left_ip, + struct map *right_map, u64 right_ip) +{ + struct dso *left_dso = left_map ? left_map->dso : NULL; + struct dso *right_dso = right_map ? right_map->dso : NULL; + + if (left_dso != right_dso) + return left_dso < right_dso ? MATCH_LT : MATCH_GT; + + if (left_ip != right_ip) + return left_ip < right_ip ? MATCH_LT : MATCH_GT; + + return MATCH_EQ; +} + +static enum match_result match_chain(struct callchain_cursor_node *node, + struct callchain_list *cnode) +{ + enum match_result match = MATCH_ERROR; + + switch (callchain_param.key) { + case CCKEY_SRCLINE: + match = match_chain_strings(cnode->srcline, node->srcline); + if (match != MATCH_ERROR) + break; + /* otherwise fall-back to symbol-based comparison below */ + __fallthrough; + case CCKEY_FUNCTION: + if (node->ms.sym && cnode->ms.sym) { + /* + * Compare inlined frames based on their symbol name + * because different inlined frames will have the same + * symbol start. Otherwise do a faster comparison based + * on the symbol start address. + */ + if (cnode->ms.sym->inlined || node->ms.sym->inlined) { + match = match_chain_strings(cnode->ms.sym->name, + node->ms.sym->name); + if (match != MATCH_ERROR) + break; + } else { + match = match_chain_dso_addresses(cnode->ms.map, cnode->ms.sym->start, + node->ms.map, node->ms.sym->start); + break; + } + } + /* otherwise fall-back to IP-based comparison below */ + __fallthrough; + case CCKEY_ADDRESS: + default: + match = match_chain_dso_addresses(cnode->ms.map, cnode->ip, node->ms.map, node->ip); + break; + } + + if (match == MATCH_EQ && node->branch) { + cnode->branch_count++; + + if (node->branch_from) { + /* + * It's "to" of a branch + */ + cnode->brtype_stat.branch_to = true; + + if (node->branch_flags.predicted) + cnode->predicted_count++; + + if (node->branch_flags.abort) + cnode->abort_count++; + + branch_type_count(&cnode->brtype_stat, + &node->branch_flags, + node->branch_from, + node->ip); + } else { + /* + * It's "from" of a branch + */ + cnode->brtype_stat.branch_to = false; + cnode->cycles_count += node->branch_flags.cycles; + cnode->iter_count += node->nr_loop_iter; + cnode->iter_cycles += node->iter_cycles; + cnode->from_count++; + } + } + + return match; +} + +/* + * Split the parent in two parts (a new child is created) and + * give a part of its callchain to the created child. + * Then create another child to host the given callchain of new branch + */ +static int +split_add_child(struct callchain_node *parent, + struct callchain_cursor *cursor, + struct callchain_list *to_split, + u64 idx_parents, u64 idx_local, u64 period) +{ + struct callchain_node *new; + struct list_head *old_tail; + unsigned int idx_total = idx_parents + idx_local; + + /* split */ + new = create_child(parent, true); + if (new == NULL) + return -1; + + /* split the callchain and move a part to the new child */ + old_tail = parent->val.prev; + list_del_range(&to_split->list, old_tail); + new->val.next = &to_split->list; + new->val.prev = old_tail; + to_split->list.prev = &new->val; + old_tail->next = &new->val; + + /* split the hits */ + new->hit = parent->hit; + new->children_hit = parent->children_hit; + parent->children_hit = callchain_cumul_hits(new); + new->val_nr = parent->val_nr - idx_local; + parent->val_nr = idx_local; + new->count = parent->count; + new->children_count = parent->children_count; + parent->children_count = callchain_cumul_counts(new); + + /* create a new child for the new branch if any */ + if (idx_total < cursor->nr) { + struct callchain_node *first; + struct callchain_list *cnode; + struct callchain_cursor_node *node; + struct rb_node *p, **pp; + + parent->hit = 0; + parent->children_hit += period; + parent->count = 0; + parent->children_count += 1; + + node = callchain_cursor_current(cursor); + new = add_child(parent, cursor, period); + if (new == NULL) + return -1; + + /* + * This is second child since we moved parent's children + * to new (first) child above. + */ + p = parent->rb_root_in.rb_node; + first = rb_entry(p, struct callchain_node, rb_node_in); + cnode = list_first_entry(&first->val, struct callchain_list, + list); + + if (match_chain(node, cnode) == MATCH_LT) + pp = &p->rb_left; + else + pp = &p->rb_right; + + rb_link_node(&new->rb_node_in, p, pp); + rb_insert_color(&new->rb_node_in, &parent->rb_root_in); + } else { + parent->hit = period; + parent->count = 1; + } + return 0; +} + +static enum match_result +append_chain(struct callchain_node *root, + struct callchain_cursor *cursor, + u64 period); + +static int +append_chain_children(struct callchain_node *root, + struct callchain_cursor *cursor, + u64 period) +{ + struct callchain_node *rnode; + struct callchain_cursor_node *node; + struct rb_node **p = &root->rb_root_in.rb_node; + struct rb_node *parent = NULL; + + node = callchain_cursor_current(cursor); + if (!node) + return -1; + + /* lookup in children */ + while (*p) { + enum match_result ret; + + parent = *p; + rnode = rb_entry(parent, struct callchain_node, rb_node_in); + + /* If at least first entry matches, rely to children */ + ret = append_chain(rnode, cursor, period); + if (ret == MATCH_EQ) + goto inc_children_hit; + if (ret == MATCH_ERROR) + return -1; + + if (ret == MATCH_LT) + p = &parent->rb_left; + else + p = &parent->rb_right; + } + /* nothing in children, add to the current node */ + rnode = add_child(root, cursor, period); + if (rnode == NULL) + return -1; + + rb_link_node(&rnode->rb_node_in, parent, p); + rb_insert_color(&rnode->rb_node_in, &root->rb_root_in); + +inc_children_hit: + root->children_hit += period; + root->children_count++; + return 0; +} + +static enum match_result +append_chain(struct callchain_node *root, + struct callchain_cursor *cursor, + u64 period) +{ + struct callchain_list *cnode; + u64 start = cursor->pos; + bool found = false; + u64 matches; + enum match_result cmp = MATCH_ERROR; + + /* + * Lookup in the current node + * If we have a symbol, then compare the start to match + * anywhere inside a function, unless function + * mode is disabled. + */ + list_for_each_entry(cnode, &root->val, list) { + struct callchain_cursor_node *node; + + node = callchain_cursor_current(cursor); + if (!node) + break; + + cmp = match_chain(node, cnode); + if (cmp != MATCH_EQ) + break; + + found = true; + + callchain_cursor_advance(cursor); + } + + /* matches not, relay no the parent */ + if (!found) { + WARN_ONCE(cmp == MATCH_ERROR, "Chain comparison error\n"); + return cmp; + } + + matches = cursor->pos - start; + + /* we match only a part of the node. Split it and add the new chain */ + if (matches < root->val_nr) { + if (split_add_child(root, cursor, cnode, start, matches, + period) < 0) + return MATCH_ERROR; + + return MATCH_EQ; + } + + /* we match 100% of the path, increment the hit */ + if (matches == root->val_nr && cursor->pos == cursor->nr) { + root->hit += period; + root->count++; + return MATCH_EQ; + } + + /* We match the node and still have a part remaining */ + if (append_chain_children(root, cursor, period) < 0) + return MATCH_ERROR; + + return MATCH_EQ; +} + +int callchain_append(struct callchain_root *root, + struct callchain_cursor *cursor, + u64 period) +{ + if (!cursor->nr) + return 0; + + callchain_cursor_commit(cursor); + + if (append_chain_children(&root->node, cursor, period) < 0) + return -1; + + if (cursor->nr > root->max_depth) + root->max_depth = cursor->nr; + + return 0; +} + +static int +merge_chain_branch(struct callchain_cursor *cursor, + struct callchain_node *dst, struct callchain_node *src) +{ + struct callchain_cursor_node **old_last = cursor->last; + struct callchain_node *child; + struct callchain_list *list, *next_list; + struct rb_node *n; + int old_pos = cursor->nr; + int err = 0; + + list_for_each_entry_safe(list, next_list, &src->val, list) { + callchain_cursor_append(cursor, list->ip, &list->ms, + false, NULL, 0, 0, 0, list->srcline); + list_del_init(&list->list); + map__zput(list->ms.map); + free(list); + } + + if (src->hit) { + callchain_cursor_commit(cursor); + if (append_chain_children(dst, cursor, src->hit) < 0) + return -1; + } + + n = rb_first(&src->rb_root_in); + while (n) { + child = container_of(n, struct callchain_node, rb_node_in); + n = rb_next(n); + rb_erase(&child->rb_node_in, &src->rb_root_in); + + err = merge_chain_branch(cursor, dst, child); + if (err) + break; + + free(child); + } + + cursor->nr = old_pos; + cursor->last = old_last; + + return err; +} + +int callchain_merge(struct callchain_cursor *cursor, + struct callchain_root *dst, struct callchain_root *src) +{ + return merge_chain_branch(cursor, &dst->node, &src->node); +} + +int callchain_cursor_append(struct callchain_cursor *cursor, + u64 ip, struct map_symbol *ms, + bool branch, struct branch_flags *flags, + int nr_loop_iter, u64 iter_cycles, u64 branch_from, + const char *srcline) +{ + struct callchain_cursor_node *node = *cursor->last; + + if (!node) { + node = calloc(1, sizeof(*node)); + if (!node) + return -ENOMEM; + + *cursor->last = node; + } + + node->ip = ip; + map__zput(node->ms.map); + node->ms = *ms; + map__get(node->ms.map); + node->branch = branch; + node->nr_loop_iter = nr_loop_iter; + node->iter_cycles = iter_cycles; + node->srcline = srcline; + + if (flags) + memcpy(&node->branch_flags, flags, + sizeof(struct branch_flags)); + + node->branch_from = branch_from; + cursor->nr++; + + cursor->last = &node->next; + + return 0; +} + +int sample__resolve_callchain(struct perf_sample *sample, + struct callchain_cursor *cursor, struct symbol **parent, + struct evsel *evsel, struct addr_location *al, + int max_stack) +{ + if (sample->callchain == NULL && !symbol_conf.show_branchflag_count) + return 0; + + if (symbol_conf.use_callchain || symbol_conf.cumulate_callchain || + perf_hpp_list.parent || symbol_conf.show_branchflag_count) { + return thread__resolve_callchain(al->thread, cursor, evsel, sample, + parent, al, max_stack); + } + return 0; +} + +int hist_entry__append_callchain(struct hist_entry *he, struct perf_sample *sample) +{ + if ((!symbol_conf.use_callchain || sample->callchain == NULL) && + !symbol_conf.show_branchflag_count) + return 0; + return callchain_append(he->callchain, &callchain_cursor, sample->period); +} + +int fill_callchain_info(struct addr_location *al, struct callchain_cursor_node *node, + bool hide_unresolved) +{ + al->maps = node->ms.maps; + al->map = node->ms.map; + al->sym = node->ms.sym; + al->srcline = node->srcline; + al->addr = node->ip; + + if (al->sym == NULL) { + if (hide_unresolved) + return 0; + if (al->map == NULL) + goto out; + } + + if (al->maps == machine__kernel_maps(al->maps->machine)) { + if (machine__is_host(al->maps->machine)) { + al->cpumode = PERF_RECORD_MISC_KERNEL; + al->level = 'k'; + } else { + al->cpumode = PERF_RECORD_MISC_GUEST_KERNEL; + al->level = 'g'; + } + } else { + if (machine__is_host(al->maps->machine)) { + al->cpumode = PERF_RECORD_MISC_USER; + al->level = '.'; + } else if (perf_guest) { + al->cpumode = PERF_RECORD_MISC_GUEST_USER; + al->level = 'u'; + } else { + al->cpumode = PERF_RECORD_MISC_HYPERVISOR; + al->level = 'H'; + } + } + +out: + return 1; +} + +char *callchain_list__sym_name(struct callchain_list *cl, + char *bf, size_t bfsize, bool show_dso) +{ + bool show_addr = callchain_param.key == CCKEY_ADDRESS; + bool show_srcline = show_addr || callchain_param.key == CCKEY_SRCLINE; + int printed; + + if (cl->ms.sym) { + const char *inlined = cl->ms.sym->inlined ? " (inlined)" : ""; + + if (show_srcline && cl->srcline) + printed = scnprintf(bf, bfsize, "%s %s%s", + cl->ms.sym->name, cl->srcline, + inlined); + else + printed = scnprintf(bf, bfsize, "%s%s", + cl->ms.sym->name, inlined); + } else + printed = scnprintf(bf, bfsize, "%#" PRIx64, cl->ip); + + if (show_dso) + scnprintf(bf + printed, bfsize - printed, " %s", + cl->ms.map ? + cl->ms.map->dso->short_name : + "unknown"); + + return bf; +} + +char *callchain_node__scnprintf_value(struct callchain_node *node, + char *bf, size_t bfsize, u64 total) +{ + double percent = 0.0; + u64 period = callchain_cumul_hits(node); + unsigned count = callchain_cumul_counts(node); + + if (callchain_param.mode == CHAIN_FOLDED) { + period = node->hit; + count = node->count; + } + + switch (callchain_param.value) { + case CCVAL_PERIOD: + scnprintf(bf, bfsize, "%"PRIu64, period); + break; + case CCVAL_COUNT: + scnprintf(bf, bfsize, "%u", count); + break; + case CCVAL_PERCENT: + default: + if (total) + percent = period * 100.0 / total; + scnprintf(bf, bfsize, "%.2f%%", percent); + break; + } + return bf; +} + +int callchain_node__fprintf_value(struct callchain_node *node, + FILE *fp, u64 total) +{ + double percent = 0.0; + u64 period = callchain_cumul_hits(node); + unsigned count = callchain_cumul_counts(node); + + if (callchain_param.mode == CHAIN_FOLDED) { + period = node->hit; + count = node->count; + } + + switch (callchain_param.value) { + case CCVAL_PERIOD: + return fprintf(fp, "%"PRIu64, period); + case CCVAL_COUNT: + return fprintf(fp, "%u", count); + case CCVAL_PERCENT: + default: + if (total) + percent = period * 100.0 / total; + return percent_color_fprintf(fp, "%.2f%%", percent); + } + return 0; +} + +static void callchain_counts_value(struct callchain_node *node, + u64 *branch_count, u64 *predicted_count, + u64 *abort_count, u64 *cycles_count) +{ + struct callchain_list *clist; + + list_for_each_entry(clist, &node->val, list) { + if (branch_count) + *branch_count += clist->branch_count; + + if (predicted_count) + *predicted_count += clist->predicted_count; + + if (abort_count) + *abort_count += clist->abort_count; + + if (cycles_count) + *cycles_count += clist->cycles_count; + } +} + +static int callchain_node_branch_counts_cumul(struct callchain_node *node, + u64 *branch_count, + u64 *predicted_count, + u64 *abort_count, + u64 *cycles_count) +{ + struct callchain_node *child; + struct rb_node *n; + + n = rb_first(&node->rb_root_in); + while (n) { + child = rb_entry(n, struct callchain_node, rb_node_in); + n = rb_next(n); + + callchain_node_branch_counts_cumul(child, branch_count, + predicted_count, + abort_count, + cycles_count); + + callchain_counts_value(child, branch_count, + predicted_count, abort_count, + cycles_count); + } + + return 0; +} + +int callchain_branch_counts(struct callchain_root *root, + u64 *branch_count, u64 *predicted_count, + u64 *abort_count, u64 *cycles_count) +{ + if (branch_count) + *branch_count = 0; + + if (predicted_count) + *predicted_count = 0; + + if (abort_count) + *abort_count = 0; + + if (cycles_count) + *cycles_count = 0; + + return callchain_node_branch_counts_cumul(&root->node, + branch_count, + predicted_count, + abort_count, + cycles_count); +} + +static int count_pri64_printf(int idx, const char *str, u64 value, char *bf, int bfsize) +{ + return scnprintf(bf, bfsize, "%s%s:%" PRId64 "", (idx) ? " " : " (", str, value); +} + +static int count_float_printf(int idx, const char *str, float value, + char *bf, int bfsize, float threshold) +{ + if (threshold != 0.0 && value < threshold) + return 0; + + return scnprintf(bf, bfsize, "%s%s:%.1f%%", (idx) ? " " : " (", str, value); +} + +static int branch_to_str(char *bf, int bfsize, + u64 branch_count, u64 predicted_count, + u64 abort_count, + struct branch_type_stat *brtype_stat) +{ + int printed, i = 0; + + printed = branch_type_str(brtype_stat, bf, bfsize); + if (printed) + i++; + + if (predicted_count < branch_count) { + printed += count_float_printf(i++, "predicted", + predicted_count * 100.0 / branch_count, + bf + printed, bfsize - printed, 0.0); + } + + if (abort_count) { + printed += count_float_printf(i++, "abort", + abort_count * 100.0 / branch_count, + bf + printed, bfsize - printed, 0.1); + } + + if (i) + printed += scnprintf(bf + printed, bfsize - printed, ")"); + + return printed; +} + +static int branch_from_str(char *bf, int bfsize, + u64 branch_count, + u64 cycles_count, u64 iter_count, + u64 iter_cycles, u64 from_count) +{ + int printed = 0, i = 0; + u64 cycles, v = 0; + + cycles = cycles_count / branch_count; + if (cycles) { + printed += count_pri64_printf(i++, "cycles", + cycles, + bf + printed, bfsize - printed); + } + + if (iter_count && from_count) { + v = iter_count / from_count; + if (v) { + printed += count_pri64_printf(i++, "iter", + v, bf + printed, bfsize - printed); + + printed += count_pri64_printf(i++, "avg_cycles", + iter_cycles / iter_count, + bf + printed, bfsize - printed); + } + } + + if (i) + printed += scnprintf(bf + printed, bfsize - printed, ")"); + + return printed; +} + +static int counts_str_build(char *bf, int bfsize, + u64 branch_count, u64 predicted_count, + u64 abort_count, u64 cycles_count, + u64 iter_count, u64 iter_cycles, + u64 from_count, + struct branch_type_stat *brtype_stat) +{ + int printed; + + if (branch_count == 0) + return scnprintf(bf, bfsize, " (calltrace)"); + + if (brtype_stat->branch_to) { + printed = branch_to_str(bf, bfsize, branch_count, + predicted_count, abort_count, brtype_stat); + } else { + printed = branch_from_str(bf, bfsize, branch_count, + cycles_count, iter_count, iter_cycles, + from_count); + } + + if (!printed) + bf[0] = 0; + + return printed; +} + +static int callchain_counts_printf(FILE *fp, char *bf, int bfsize, + u64 branch_count, u64 predicted_count, + u64 abort_count, u64 cycles_count, + u64 iter_count, u64 iter_cycles, + u64 from_count, + struct branch_type_stat *brtype_stat) +{ + char str[256]; + + counts_str_build(str, sizeof(str), branch_count, + predicted_count, abort_count, cycles_count, + iter_count, iter_cycles, from_count, brtype_stat); + + if (fp) + return fprintf(fp, "%s", str); + + return scnprintf(bf, bfsize, "%s", str); +} + +int callchain_list_counts__printf_value(struct callchain_list *clist, + FILE *fp, char *bf, int bfsize) +{ + u64 branch_count, predicted_count; + u64 abort_count, cycles_count; + u64 iter_count, iter_cycles; + u64 from_count; + + branch_count = clist->branch_count; + predicted_count = clist->predicted_count; + abort_count = clist->abort_count; + cycles_count = clist->cycles_count; + iter_count = clist->iter_count; + iter_cycles = clist->iter_cycles; + from_count = clist->from_count; + + return callchain_counts_printf(fp, bf, bfsize, branch_count, + predicted_count, abort_count, + cycles_count, iter_count, iter_cycles, + from_count, &clist->brtype_stat); +} + +static void free_callchain_node(struct callchain_node *node) +{ + struct callchain_list *list, *tmp; + struct callchain_node *child; + struct rb_node *n; + + list_for_each_entry_safe(list, tmp, &node->parent_val, list) { + list_del_init(&list->list); + map__zput(list->ms.map); + free(list); + } + + list_for_each_entry_safe(list, tmp, &node->val, list) { + list_del_init(&list->list); + map__zput(list->ms.map); + free(list); + } + + n = rb_first(&node->rb_root_in); + while (n) { + child = container_of(n, struct callchain_node, rb_node_in); + n = rb_next(n); + rb_erase(&child->rb_node_in, &node->rb_root_in); + + free_callchain_node(child); + free(child); + } +} + +void free_callchain(struct callchain_root *root) +{ + if (!symbol_conf.use_callchain) + return; + + free_callchain_node(&root->node); +} + +static u64 decay_callchain_node(struct callchain_node *node) +{ + struct callchain_node *child; + struct rb_node *n; + u64 child_hits = 0; + + n = rb_first(&node->rb_root_in); + while (n) { + child = container_of(n, struct callchain_node, rb_node_in); + + child_hits += decay_callchain_node(child); + n = rb_next(n); + } + + node->hit = (node->hit * 7) / 8; + node->children_hit = child_hits; + + return node->hit; +} + +void decay_callchain(struct callchain_root *root) +{ + if (!symbol_conf.use_callchain) + return; + + decay_callchain_node(&root->node); +} + +int callchain_node__make_parent_list(struct callchain_node *node) +{ + struct callchain_node *parent = node->parent; + struct callchain_list *chain, *new; + LIST_HEAD(head); + + while (parent) { + list_for_each_entry_reverse(chain, &parent->val, list) { + new = malloc(sizeof(*new)); + if (new == NULL) + goto out; + *new = *chain; + new->has_children = false; + map__get(new->ms.map); + list_add_tail(&new->list, &head); + } + parent = parent->parent; + } + + list_for_each_entry_safe_reverse(chain, new, &head, list) + list_move_tail(&chain->list, &node->parent_val); + + if (!list_empty(&node->parent_val)) { + chain = list_first_entry(&node->parent_val, struct callchain_list, list); + chain->has_children = rb_prev(&node->rb_node) || rb_next(&node->rb_node); + + chain = list_first_entry(&node->val, struct callchain_list, list); + chain->has_children = false; + } + return 0; + +out: + list_for_each_entry_safe(chain, new, &head, list) { + list_del_init(&chain->list); + map__zput(chain->ms.map); + free(chain); + } + return -ENOMEM; +} + +int callchain_cursor__copy(struct callchain_cursor *dst, + struct callchain_cursor *src) +{ + int rc = 0; + + callchain_cursor_reset(dst); + callchain_cursor_commit(src); + + while (true) { + struct callchain_cursor_node *node; + + node = callchain_cursor_current(src); + if (node == NULL) + break; + + rc = callchain_cursor_append(dst, node->ip, &node->ms, + node->branch, &node->branch_flags, + node->nr_loop_iter, + node->iter_cycles, + node->branch_from, node->srcline); + if (rc) + break; + + callchain_cursor_advance(src); + } + + return rc; +} + +/* + * Initialize a cursor before adding entries inside, but keep + * the previously allocated entries as a cache. + */ +void callchain_cursor_reset(struct callchain_cursor *cursor) +{ + struct callchain_cursor_node *node; + + cursor->nr = 0; + cursor->last = &cursor->first; + + for (node = cursor->first; node != NULL; node = node->next) + map__zput(node->ms.map); +} + +void callchain_param_setup(u64 sample_type, const char *arch) +{ + if (symbol_conf.use_callchain || symbol_conf.cumulate_callchain) { + if ((sample_type & PERF_SAMPLE_REGS_USER) && + (sample_type & PERF_SAMPLE_STACK_USER)) { + callchain_param.record_mode = CALLCHAIN_DWARF; + dwarf_callchain_users = true; + } else if (sample_type & PERF_SAMPLE_BRANCH_STACK) + callchain_param.record_mode = CALLCHAIN_LBR; + else + callchain_param.record_mode = CALLCHAIN_FP; + } + + /* + * It's necessary to use libunwind to reliably determine the caller of + * a leaf function on aarch64, as otherwise we cannot know whether to + * start from the LR or FP. + * + * Always starting from the LR can result in duplicate or entirely + * erroneous entries. Always skipping the LR and starting from the FP + * can result in missing entries. + */ + if (callchain_param.record_mode == CALLCHAIN_FP && !strcmp(arch, "arm64")) + dwarf_callchain_users = true; +} + +static bool chain_match(struct callchain_list *base_chain, + struct callchain_list *pair_chain) +{ + enum match_result match; + + match = match_chain_strings(base_chain->srcline, + pair_chain->srcline); + if (match != MATCH_ERROR) + return match == MATCH_EQ; + + match = match_chain_dso_addresses(base_chain->ms.map, + base_chain->ip, + pair_chain->ms.map, + pair_chain->ip); + + return match == MATCH_EQ; +} + +bool callchain_cnode_matched(struct callchain_node *base_cnode, + struct callchain_node *pair_cnode) +{ + struct callchain_list *base_chain, *pair_chain; + bool match = false; + + pair_chain = list_first_entry(&pair_cnode->val, + struct callchain_list, + list); + + list_for_each_entry(base_chain, &base_cnode->val, list) { + if (&pair_chain->list == &pair_cnode->val) + return false; + + if (!base_chain->srcline || !pair_chain->srcline) { + pair_chain = list_next_entry(pair_chain, list); + continue; + } + + match = chain_match(base_chain, pair_chain); + if (!match) + return false; + + pair_chain = list_next_entry(pair_chain, list); + } + + /* + * Say chain1 is ABC, chain2 is ABCD, we consider they are + * not fully matched. + */ + if (pair_chain && (&pair_chain->list != &pair_cnode->val)) + return false; + + return match; +} + +static u64 count_callchain_hits(struct hist_entry *he) +{ + struct rb_root *root = &he->sorted_chain; + struct rb_node *rb_node = rb_first(root); + struct callchain_node *node; + u64 chain_hits = 0; + + while (rb_node) { + node = rb_entry(rb_node, struct callchain_node, rb_node); + chain_hits += node->hit; + rb_node = rb_next(rb_node); + } + + return chain_hits; +} + +u64 callchain_total_hits(struct hists *hists) +{ + struct rb_node *next = rb_first_cached(&hists->entries); + u64 chain_hits = 0; + + while (next) { + struct hist_entry *he = rb_entry(next, struct hist_entry, + rb_node); + + chain_hits += count_callchain_hits(he); + next = rb_next(&he->rb_node); + } + + return chain_hits; +} + +s64 callchain_avg_cycles(struct callchain_node *cnode) +{ + struct callchain_list *chain; + s64 cycles = 0; + + list_for_each_entry(chain, &cnode->val, list) { + if (chain->srcline && chain->branch_count) + cycles += chain->cycles_count / chain->branch_count; + } + + return cycles; +} |