mirror of https://gitee.com/openkylin/linux.git
perf report: Add support for callchain graph output
Currently, the printing of callchains is done in a single
vertical level, this is the "flat" mode:
8.25% [k] copy_user_generic_string
4.19%
copy_user_generic_string
generic_file_aio_read
do_sync_read
vfs_read
sys_pread64
system_call_fastpath
pread64
This patch introduces a new "graph" mode which provides a
hierarchical output of factorized paths recursively sorted:
8.25% [k] copy_user_generic_string
|
|--4.31%-- generic_file_aio_read
| do_sync_read
| vfs_read
| |
| |--4.19%-- sys_pread64
| | system_call_fastpath
| | pread64
| |
| --0.12%-- sys_read
| system_call_fastpath
| __read
|
|--3.24%-- generic_file_buffered_write
| __generic_file_aio_write_nolock
| generic_file_aio_write
| do_sync_write
| reiserfs_file_write
| vfs_write
| |
| |--3.14%-- sys_pwrite64
| | system_call_fastpath
| | __pwrite64
| |
| --0.10%-- sys_write
[...]
The command line has then changed.
By providing the -c option, the callchain will output in the
flat mode by default.
But you can override it:
perf report -c graph
or
perf report -c flat
You can also pass the abreviated mode:
perf report -c g
or
perf report -c gra
will both make use of the graph mode.
Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Anton Blanchard <anton@samba.org>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
LKML-Reference: <1246550301-8954-3-git-send-email-fweisbec@gmail.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Frederic Weisbecker
Ingo Molnar
parent
5a4b181721
commit
4eb3e4788b
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@ -59,6 +59,7 @@ static regex_t parent_regex;
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static int exclude_other = 1;
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static int callchain;
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static enum chain_mode callchain_mode;
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static u64 sample_type;
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@ -787,8 +788,103 @@ hist_entry__collapse(struct hist_entry *left, struct hist_entry *right)
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return cmp;
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}
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static size_t ipchain__fprintf_graph_line(FILE *fp, int depth, int depth_mask)
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{
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int i;
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size_t ret = 0;
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ret += fprintf(fp, "%s", " ");
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for (i = 0; i < depth; i++)
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if (depth_mask & (1 << i))
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ret += fprintf(fp, "| ");
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else
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ret += fprintf(fp, " ");
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ret += fprintf(fp, "\n");
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return ret;
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}
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static size_t
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callchain__fprintf(FILE *fp, struct callchain_node *self, u64 total_samples)
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ipchain__fprintf_graph(FILE *fp, struct callchain_list *chain, int depth,
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int depth_mask, int count, u64 total_samples,
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int hits)
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{
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int i;
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size_t ret = 0;
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ret += fprintf(fp, "%s", " ");
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for (i = 0; i < depth; i++) {
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if (depth_mask & (1 << i))
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ret += fprintf(fp, "|");
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else
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ret += fprintf(fp, " ");
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if (!count && i == depth - 1) {
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double percent;
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percent = hits * 100.0 / total_samples;
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ret += fprintf(fp, "--%2.2f%%-- ", percent);
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} else
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ret += fprintf(fp, "%s", " ");
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}
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if (chain->sym)
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ret += fprintf(fp, "%s\n", chain->sym->name);
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else
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ret += fprintf(fp, "%p\n", (void *)(long)chain->ip);
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return ret;
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}
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static size_t
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callchain__fprintf_graph(FILE *fp, struct callchain_node *self,
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u64 total_samples, int depth, int depth_mask)
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{
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struct rb_node *node, *next;
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struct callchain_node *child;
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struct callchain_list *chain;
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int new_depth_mask = depth_mask;
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size_t ret = 0;
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int i;
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node = rb_first(&self->rb_root);
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while (node) {
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child = rb_entry(node, struct callchain_node, rb_node);
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/*
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* The depth mask manages the output of pipes that show
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* the depth. We don't want to keep the pipes of the current
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* level for the last child of this depth
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*/
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next = rb_next(node);
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if (!next)
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new_depth_mask &= ~(1 << (depth - 1));
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/*
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* But we keep the older depth mask for the line seperator
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* to keep the level link until we reach the last child
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*/
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ret += ipchain__fprintf_graph_line(fp, depth, depth_mask);
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i = 0;
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list_for_each_entry(chain, &child->val, list) {
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if (chain->ip >= PERF_CONTEXT_MAX)
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continue;
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ret += ipchain__fprintf_graph(fp, chain, depth,
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new_depth_mask, i++,
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total_samples,
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child->cumul_hit);
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}
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ret += callchain__fprintf_graph(fp, child, total_samples,
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depth + 1,
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new_depth_mask | (1 << depth));
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node = next;
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}
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return ret;
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}
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static size_t
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callchain__fprintf_flat(FILE *fp, struct callchain_node *self,
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u64 total_samples)
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{
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struct callchain_list *chain;
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size_t ret = 0;
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@ -796,7 +892,7 @@ callchain__fprintf(FILE *fp, struct callchain_node *self, u64 total_samples)
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if (!self)
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return 0;
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ret += callchain__fprintf(fp, self->parent, total_samples);
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ret += callchain__fprintf_flat(fp, self->parent, total_samples);
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list_for_each_entry(chain, &self->val, list) {
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@ -826,8 +922,13 @@ hist_entry_callchain__fprintf(FILE *fp, struct hist_entry *self,
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chain = rb_entry(rb_node, struct callchain_node, rb_node);
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percent = chain->hit * 100.0 / total_samples;
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ret += fprintf(fp, " %6.2f%%\n", percent);
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ret += callchain__fprintf(fp, chain, total_samples);
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if (callchain_mode == FLAT) {
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ret += fprintf(fp, " %6.2f%%\n", percent);
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ret += callchain__fprintf_flat(fp, chain, total_samples);
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} else if (callchain_mode == GRAPH) {
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ret += callchain__fprintf_graph(fp, chain,
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total_samples, 1, 1);
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}
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ret += fprintf(fp, "\n");
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rb_node = rb_next(rb_node);
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}
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@ -1129,8 +1230,12 @@ static void output__insert_entry(struct hist_entry *he)
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struct rb_node *parent = NULL;
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struct hist_entry *iter;
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if (callchain)
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sort_chain_to_rbtree(&he->sorted_chain, &he->callchain);
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if (callchain) {
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if (callchain_mode == FLAT)
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sort_chain_flat(&he->sorted_chain, &he->callchain);
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else if (callchain_mode == GRAPH)
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sort_chain_graph(&he->sorted_chain, &he->callchain);
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}
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while (*p != NULL) {
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parent = *p;
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@ -1702,6 +1807,26 @@ static int __cmd_report(void)
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return rc;
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}
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static int
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parse_callchain_opt(const struct option *opt __used, const char *arg,
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int unset __used)
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{
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callchain = 1;
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if (!arg)
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return 0;
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if (!strncmp(arg, "graph", strlen(arg)))
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callchain_mode = GRAPH;
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else if (!strncmp(arg, "flat", strlen(arg)))
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callchain_mode = FLAT;
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else
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return -1;
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return 0;
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}
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static const char * const report_usage[] = {
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"perf report [<options>] <command>",
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NULL
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@ -1725,7 +1850,9 @@ static const struct option options[] = {
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"regex filter to identify parent, see: '--sort parent'"),
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OPT_BOOLEAN('x', "exclude-other", &exclude_other,
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"Only display entries with parent-match"),
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OPT_BOOLEAN('c', "callchain", &callchain, "Display callchains"),
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OPT_CALLBACK_DEFAULT('c', "callchain", NULL, "output_type",
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"Display callchains with output_type: flat, graph. "
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"Default to flat", &parse_callchain_opt, "flat"),
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OPT_STRING('d', "dsos", &dso_list_str, "dso[,dso...]",
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"only consider symbols in these dsos"),
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OPT_STRING('C', "comms", &comm_list_str, "comm[,comm...]",
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@ -19,9 +19,9 @@
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#define chain_for_each_child(child, parent) \
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list_for_each_entry(child, &parent->children, brothers)
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static void
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rb_insert_callchain(struct rb_root *root, struct callchain_node *chain)
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rb_insert_callchain(struct rb_root *root, struct callchain_node *chain,
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enum chain_mode mode)
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{
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struct rb_node **p = &root->rb_node;
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struct rb_node *parent = NULL;
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@ -31,10 +31,22 @@ rb_insert_callchain(struct rb_root *root, struct callchain_node *chain)
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parent = *p;
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rnode = rb_entry(parent, struct callchain_node, rb_node);
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if (rnode->hit < chain->hit)
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p = &(*p)->rb_left;
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else
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p = &(*p)->rb_right;
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switch (mode) {
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case FLAT:
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if (rnode->hit < chain->hit)
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p = &(*p)->rb_left;
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else
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p = &(*p)->rb_right;
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break;
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case GRAPH:
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if (rnode->cumul_hit < chain->cumul_hit)
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p = &(*p)->rb_left;
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else
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p = &(*p)->rb_right;
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break;
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default:
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break;
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}
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}
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rb_link_node(&chain->rb_node, parent, p);
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@ -45,15 +57,36 @@ rb_insert_callchain(struct rb_root *root, struct callchain_node *chain)
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* Once we get every callchains from the stream, we can now
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* sort them by hit
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*/
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void sort_chain_to_rbtree(struct rb_root *rb_root, struct callchain_node *node)
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void sort_chain_flat(struct rb_root *rb_root, struct callchain_node *node)
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{
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struct callchain_node *child;
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chain_for_each_child(child, node)
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sort_chain_to_rbtree(rb_root, child);
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sort_chain_flat(rb_root, child);
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if (node->hit)
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rb_insert_callchain(rb_root, node);
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rb_insert_callchain(rb_root, node, FLAT);
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}
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static void __sort_chain_graph(struct callchain_node *node)
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{
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struct callchain_node *child;
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node->rb_root = RB_ROOT;
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node->cumul_hit = node->hit;
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chain_for_each_child(child, node) {
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__sort_chain_graph(child);
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rb_insert_callchain(&node->rb_root, child, GRAPH);
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node->cumul_hit += child->cumul_hit;
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}
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}
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void
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sort_chain_graph(struct rb_root *rb_root, struct callchain_node *chain_root)
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{
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__sort_chain_graph(chain_root);
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rb_root->rb_node = chain_root->rb_root.rb_node;
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}
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/*
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@ -6,15 +6,21 @@
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#include <linux/rbtree.h>
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#include "symbol.h"
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enum chain_mode {
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FLAT,
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GRAPH
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};
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struct callchain_node {
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struct callchain_node *parent;
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struct list_head brothers;
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struct list_head children;
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struct list_head val;
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struct rb_node rb_node;
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struct rb_node rb_node; /* to sort nodes in an rbtree */
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struct rb_root rb_root; /* sorted tree of children */
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unsigned int val_nr;
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u64 hit;
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u64 cumul_hit; /* hit + hits of children */
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};
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struct callchain_list {
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@ -32,5 +38,6 @@ static inline void callchain_init(struct callchain_node *node)
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void append_chain(struct callchain_node *root, struct ip_callchain *chain,
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struct symbol **syms);
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void sort_chain_to_rbtree(struct rb_root *rb_root, struct callchain_node *node);
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void sort_chain_flat(struct rb_root *rb_root, struct callchain_node *node);
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void sort_chain_graph(struct rb_root *rb_root, struct callchain_node *node);
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#endif
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