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Date: Thu, 6 Oct 2011 14:22:30 -0300
From: Arnaldo Carvalho de Melo <acme@...radead.org>
To: Ingo Molnar <mingo@...e.hu>
Cc: linux-kernel@...r.kernel.org,
Arnaldo Carvalho de Melo <acme@...hat.com>,
David Ahern <dsahern@...il.com>,
Frederic Weisbecker <fweisbec@...il.com>,
Mike Galbraith <efault@....de>,
Paul Mackerras <paulus@...ba.org>,
Peter Zijlstra <peterz@...radead.org>,
Stephane Eranian <eranian@...gle.com>
Subject: [PATCH 07/15] perf top: Add callgraph support
From: Arnaldo Carvalho de Melo <acme@...hat.com>
Just like in 'perf report', but live.
Still needs to decay the callchains, but already somewhat useful as-is.
Cc: David Ahern <dsahern@...il.com>
Cc: Frederic Weisbecker <fweisbec@...il.com>
Cc: Mike Galbraith <efault@....de>
Cc: Paul Mackerras <paulus@...ba.org>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Stephane Eranian <eranian@...gle.com>
Link: http://lkml.kernel.org/n/tip-cj3rmaf5jpsvi3v0tf7t4uvp@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@...hat.com>
---
tools/perf/Documentation/perf-top.txt | 15 ++++
tools/perf/builtin-top.c | 146 ++++++++++++++++++++++++++++++++-
2 files changed, 159 insertions(+), 2 deletions(-)
diff --git a/tools/perf/Documentation/perf-top.txt b/tools/perf/Documentation/perf-top.txt
index d146ba3..e2e5cd0 100644
--- a/tools/perf/Documentation/perf-top.txt
+++ b/tools/perf/Documentation/perf-top.txt
@@ -126,6 +126,21 @@ Default is to monitor all CPUS.
--symbols::
Only consider these symbols.
+-G [type,min,order]::
+--call-graph::
+ Display call chains using type, min percent threshold and order.
+ type can be either:
+ - flat: single column, linear exposure of call chains.
+ - graph: use a graph tree, displaying absolute overhead rates.
+ - fractal: like graph, but displays relative rates. Each branch of
+ the tree is considered as a new profiled object.
+
+ order can be either:
+ - callee: callee based call graph.
+ - caller: inverted caller based call graph.
+
+ Default: fractal,0.5,callee.
+
INTERACTIVE PROMPTING KEYS
--------------------------
diff --git a/tools/perf/builtin-top.c b/tools/perf/builtin-top.c
index 2cf5e50..b9b7fe0 100644
--- a/tools/perf/builtin-top.c
+++ b/tools/perf/builtin-top.c
@@ -76,6 +76,12 @@ static bool system_wide = false;
static bool use_tui, use_stdio;
+static bool sort_has_symbols;
+
+static bool dont_use_callchains;
+static char callchain_default_opt[] = "fractal,0.5,callee";
+
+
static int default_interval = 0;
static bool kptr_restrict_warned;
@@ -648,9 +654,11 @@ static void perf_event__process_sample(const union perf_event *event,
struct perf_sample *sample,
struct perf_session *session)
{
+ struct symbol *parent = NULL;
u64 ip = event->ip.ip;
struct addr_location al;
struct machine *machine;
+ int err;
u8 origin = event->header.misc & PERF_RECORD_MISC_CPUMODE_MASK;
++top.samples;
@@ -748,13 +756,29 @@ static void perf_event__process_sample(const union perf_event *event,
evsel = perf_evlist__id2evsel(top.evlist, sample->id);
assert(evsel != NULL);
+ if ((sort__has_parent || symbol_conf.use_callchain) &&
+ sample->callchain) {
+ err = perf_session__resolve_callchain(session, al.thread,
+ sample->callchain, &parent);
+ if (err)
+ return;
+ }
+
he = perf_session__add_hist_entry(session, &al, sample, evsel);
if (he == NULL) {
pr_err("Problem incrementing symbol period, skipping event\n");
return;
}
- record_precise_ip(he, evsel->idx, ip);
+ if (symbol_conf.use_callchain) {
+ err = callchain_append(he->callchain, &session->callchain_cursor,
+ sample->period);
+ if (err)
+ return;
+ }
+
+ if (sort_has_symbols)
+ record_precise_ip(he, evsel->idx, ip);
}
return;
@@ -808,6 +832,9 @@ static void start_counters(struct perf_evlist *evlist)
attr->read_format |= PERF_FORMAT_ID;
}
+ if (symbol_conf.use_callchain)
+ attr->sample_type |= PERF_SAMPLE_CALLCHAIN;
+
attr->mmap = 1;
attr->comm = 1;
attr->inherit = inherit;
@@ -864,10 +891,27 @@ out_err:
exit(0);
}
+static int setup_sample_type(void)
+{
+ if (!sort_has_symbols) {
+ if (symbol_conf.use_callchain) {
+ ui__warning("Selected -g but \"sym\" not present in --sort/-s.");
+ return -EINVAL;
+ }
+ } else if (!dont_use_callchains && callchain_param.mode != CHAIN_NONE) {
+ if (callchain_register_param(&callchain_param) < 0) {
+ ui__warning("Can't register callchain params.\n");
+ return -EINVAL;
+ }
+ }
+
+ return 0;
+}
+
static int __cmd_top(void)
{
pthread_t thread;
- int ret __used;
+ int ret;
/*
* FIXME: perf_session__new should allow passing a O_MMAP, so that all this
* mmap reading, etc is encapsulated in it. Use O_WRONLY for now.
@@ -876,6 +920,10 @@ static int __cmd_top(void)
if (top.session == NULL)
return -ENOMEM;
+ ret = setup_sample_type();
+ if (ret)
+ goto out_delete;
+
if (top.target_tid != -1)
perf_event__synthesize_thread_map(top.evlist->threads,
perf_event__process, top.session);
@@ -916,6 +964,90 @@ static int __cmd_top(void)
ret = poll(top.evlist->pollfd, top.evlist->nr_fds, 100);
}
+out_delete:
+ perf_session__delete(top.session);
+ top.session = NULL;
+
+ return 0;
+}
+
+static int
+parse_callchain_opt(const struct option *opt __used, const char *arg,
+ int unset)
+{
+ char *tok, *tok2;
+ char *endptr;
+
+ /*
+ * --no-call-graph
+ */
+ if (unset) {
+ dont_use_callchains = true;
+ return 0;
+ }
+
+ symbol_conf.use_callchain = true;
+
+ if (!arg)
+ return 0;
+
+ tok = strtok((char *)arg, ",");
+ if (!tok)
+ return -1;
+
+ /* get the output mode */
+ if (!strncmp(tok, "graph", strlen(arg)))
+ callchain_param.mode = CHAIN_GRAPH_ABS;
+
+ else if (!strncmp(tok, "flat", strlen(arg)))
+ callchain_param.mode = CHAIN_FLAT;
+
+ else if (!strncmp(tok, "fractal", strlen(arg)))
+ callchain_param.mode = CHAIN_GRAPH_REL;
+
+ else if (!strncmp(tok, "none", strlen(arg))) {
+ callchain_param.mode = CHAIN_NONE;
+ symbol_conf.use_callchain = false;
+
+ return 0;
+ }
+
+ else
+ return -1;
+
+ /* get the min percentage */
+ tok = strtok(NULL, ",");
+ if (!tok)
+ goto setup;
+
+ callchain_param.min_percent = strtod(tok, &endptr);
+ if (tok == endptr)
+ return -1;
+
+ /* get the print limit */
+ tok2 = strtok(NULL, ",");
+ if (!tok2)
+ goto setup;
+
+ if (tok2[0] != 'c') {
+ callchain_param.print_limit = strtod(tok2, &endptr);
+ tok2 = strtok(NULL, ",");
+ if (!tok2)
+ goto setup;
+ }
+
+ /* get the call chain order */
+ if (!strcmp(tok2, "caller"))
+ callchain_param.order = ORDER_CALLER;
+ else if (!strcmp(tok2, "callee"))
+ callchain_param.order = ORDER_CALLEE;
+ else
+ return -1;
+setup:
+ if (callchain_register_param(&callchain_param) < 0) {
+ fprintf(stderr, "Can't register callchain params\n");
+ return -1;
+ }
return 0;
}
@@ -973,6 +1105,10 @@ static const struct option options[] = {
"sort by key(s): pid, comm, dso, symbol, parent"),
OPT_BOOLEAN('n', "show-nr-samples", &symbol_conf.show_nr_samples,
"Show a column with the number of samples"),
+ OPT_CALLBACK_DEFAULT('G', "call-graph", NULL, "output_type,min_percent, call_order",
+ "Display callchains using output_type (graph, flat, fractal, or none), min percent threshold and callchain order. "
+ "Default: fractal,0.5,callee", &parse_callchain_opt,
+ callchain_default_opt),
OPT_BOOLEAN(0, "show-total-period", &symbol_conf.show_total_period,
"Show a column with the sum of periods"),
OPT_STRING(0, "dsos", &symbol_conf.dso_list_str, "dso[,dso...]",
@@ -1082,6 +1218,12 @@ int cmd_top(int argc, const char **argv, const char *prefix __used)
sort_entry__setup_elide(&sort_comm, symbol_conf.comm_list, "comm", stdout);
sort_entry__setup_elide(&sort_sym, symbol_conf.sym_list, "symbol", stdout);
+ /*
+ * Avoid annotation data structures overhead when symbols aren't on the
+ * sort list.
+ */
+ sort_has_symbols = sort_sym.list.next != NULL;
+
get_term_dimensions(&winsize);
if (top.print_entries == 0) {
update_print_entries(&winsize);
--
1.6.2.5
--
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