perf c2c report: Allow to report callchains

Add --call-graph option to properly setup callchain code. Adding default
settings to display callchains whenever they are stored in the
perf.data.

Committer Notes:

Testing it:

  [root@jouet ~]# perf c2c record -a -g sleep 5
  [ perf record: Woken up 1 times to write data ]
  [ perf record: Captured and wrote 5.331 MB perf.data (4263 samples) ]
  [root@jouet ~]# perf evlist -v
  cpu/mem-loads,ldlat=30/P: type: 4, size: 112, config: 0x1cd, { sample_period, sample_freq }: 4000, sample_type: IP|TID|TIME|ADDR|CALLCHAIN|ID|CPU|PERIOD|DATA_SRC|WEIGHT, read_format: ID, disabled: 1, inherit: 1, mmap: 1, comm: 1, freq: 1, task: 1, precise_ip: 3, mmap_data: 1, sample_id_all: 1, mmap2: 1, comm_exec: 1, { bp_addr, config1 }: 0x1f
  cpu/mem-stores/P: type: 4, size: 112, config: 0x82d0, { sample_period, sample_freq }: 4000, sample_type: IP|TID|TIME|ADDR|CALLCHAIN|ID|CPU|PERIOD|DATA_SRC|WEIGHT, read_format: ID, disabled: 1, inherit: 1, freq: 1, precise_ip: 3, sample_id_all: 1
  [root@jouet ~]# perf c2c report --stats
  =================================================
              Trace Event Information
  =================================================
    Total records                     :       4263
    Locked Load/Store Operations      :        220
    Load Operations                   :       2130
    Loads - uncacheable               :          1
    Loads - IO                        :          7
    Loads - Miss                      :         86
    Loads - no mapping                :          5
    Load Fill Buffer Hit              :        609
    Load L1D hit                      :        612
  =================================================
              Trace Event Information
  =================================================
    Total records                     :       4263
    Locked Load/Store Operations      :        220
    Load Operations                   :       2130
    Loads - uncacheable               :          1
    Loads - IO                        :          7
    Loads - Miss                      :         86
    Loads - no mapping                :          5
    Load Fill Buffer Hit              :        609
    Load L1D hit                      :        612
    Load L2D hit                      :         27
    Load LLC hit                      :        607
    Load Local HITM                   :         15
    Load Remote HITM                  :          0
    Load Remote HIT                   :          0
    Load Local DRAM                   :        176
    Load Remote DRAM                  :          0
    Load MESI State Exclusive         :        176
    Load MESI State Shared            :          0
    Load LLC Misses                   :        176
    LLC Misses to Local DRAM          :      100.0%
    LLC Misses to Remote DRAM         :        0.0%
    LLC Misses to Remote cache (HIT)  :        0.0%
    LLC Misses to Remote cache (HITM) :        0.0%
    Store Operations                  :       2133
    Store - uncacheable               :          0
    Store - no mapping                :          1
    Store L1D Hit                     :       1967
    Store L1D Miss                    :        165
    No Page Map Rejects               :        145
    Unable to parse data source       :          0

  =================================================
      Global Shared Cache Line Event Information
  =================================================
    Total Shared Cache Lines          :         15
    Load HITs on shared lines         :         26
    Fill Buffer Hits on shared lines  :          7
    L1D hits on shared lines          :          3
    L2D hits on shared lines          :          0
    LLC hits on shared lines          :         16
    Locked Access on shared lines     :          2
    Store HITs on shared lines        :          8
    Store L1D hits on shared lines    :          7
    Total Merged records              :         23

  =================================================
                   c2c details
  =================================================
    Events                            : cpu/mem-loads,ldlat=30/P
                                      : cpu/mem-stores/P
  [root@jouet ~]#

  [root@jouet ~]# perf c2c report
Shared Data Cache Line Table (2378 entries)
                        Total           --- LLC Load Hitm --  -- Store Reference -  - Load Dram -   LLC      Total  - Core Load Hit -
           Cacheline  records    %hitm  Total   Lcl      Rmt  Total  L1Hit  L1Miss  Lcl  Rmt        Ld Miss  Loads   FB       L1   L2
- 0xffff880024380c00       10    0.00%      0     0        0      6      6       0    0    0        0            4    1        3    0
   - 0.13% _raw_spin_lock_irqsave
      - 0.07% ep_poll
           sys_epoll_wait
           do_syscall_64
           return_from_SYSCALL_64
         + 0x103573
      - 0.05% ep_poll_callback
           __wake_up_common
         - __wake_up_sync_key
            - 0.02% pipe_read
                 __vfs_read
                 vfs_read
                 sys_read
                 do_syscall_64
                 return_from_SYSCALL_64
                 0xfdad
            + 0.02% sock_def_readable
      + 0.02% ep_scan_ready_list.constprop.12
   + 0.00% mutex_lock
   + 0.00% __wake_up_common
+ 0xffff880024380c40        1    0.00%      0     0        0      1      1       0    0    0        0            0    0        0    0
+ 0xffff880024380c80        1    0.00%      0     0        0      0      0       0    0    0        0            1    0        0    0
- 0xffff8800243e9f00        1    0.00%      0     0        0      1      1       0    0    0        0            0    0        0    0
     enqueue_entity
     enqueue_task_fair
     activate_task
     ttwu_do_activate
     try_to_wake_up
     wake_up_process
     hrtimer_wakeup
     __hrtimer_run_queues
     hrtimer_interrupt
     local_apic_timer_interrupt
     smp_apic_timer_interrupt
     apic_timer_interrupt
     cpuidle_enter
     call_cpuidle
help

 -------------

And when presing 'd' to see the cacheline details:

Cacheline 0xffff880024380c00
  ----- HITM -----  -- Store Refs --                                       --------- cycles -----  cpu
      Rmt      Lcl   L1 Hit  L1 Miss    Off     Pid                   Tid  rmt hitm lcl hitm load  cnt                      Symbol
-   0.00%    0.00%  100.00%    0.00%    0x0    1473  1474:Chrome_ChildIOT         0        0   41    2  [k] _raw_spin_lock_irqsave [kernel]
   - _raw_spin_lock_irqsave
      - 51.52% ep_poll
           sys_epoll_wait
           do_syscall_64
           return_from_SYSCALL_64
         - 0x103573
              47.19% 0
              4.33% 0xc30bd
      - 35.93% ep_poll_callback
           __wake_up_common
         - __wake_up_sync_key
            - 18.20% pipe_read
                 __vfs_read
                 vfs_read
                 sys_read
                 do_syscall_64
                 return_from_SYSCALL_64
                 0xfdad
            - 17.73% sock_def_readable
                 unix_stream_sendmsg
                 sock_sendmsg
                 ___sys_sendmsg
                 __sys_sendmsg
                 sys_sendmsg
                 do_syscall_64
                 return_from_SYSCALL_64
                 __GI___libc_sendmsg
                 0x12c036af1fc0
                 0x16a4050
                 0x894928ec83485354
      + 12.45% ep_scan_ready_list.constprop.12
+   0.00%    0.00%    0.00%    0.00%    0x8    1473  1474:Chrome_ChildIOT         0        0  102    1  [k] mutex_lock             [kernel]
+   0.00%    0.00%    0.00%    0.00%   0x38    1473  1473:chrome                  0        0   88    1  [k] __wake_up_common       [kernel]

help
Signed-off-by: Jiri Olsa <jolsa@kernel.org>
Tested-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Andi Kleen <andi@firstfloor.org>
Cc: David Ahern <dsahern@gmail.com>
Cc: Don Zickus <dzickus@redhat.com>
Cc: Joe Mario <jmario@redhat.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Link: http://lkml.kernel.org/n/tip-inykbom2f19difvsu1e18avr@git.kernel.orgSigned-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

tools/perf/builtin-c2c.c

@@ -17,6 +17,7 @@
 #include "evsel.h"
 #include <asm/bug.h>
 #include "ui/browsers/hists.h"
+#include "evlist.h"
 
 struct c2c_hists {
 	struct hists		hists;
@@ -183,6 +184,11 @@ static int process_sample_event(struct perf_tool *tool __maybe_unused,
 		return -1;
 	}
 
+	ret = sample__resolve_callchain(sample, &callchain_cursor, NULL,
+					evsel, &al, sysctl_perf_event_max_stack);
+	if (ret)
+		goto out;
+
 	mi = sample__resolve_mem(sample, &al);
 	if (mi == NULL)
 		return -ENOMEM;
@@ -2117,6 +2123,58 @@ static void ui_quirks(void)
 	}
 }
 
+#define CALLCHAIN_DEFAULT_OPT  "graph,0.5,caller,function,percent"
+
+const char callchain_help[] = "Display call graph (stack chain/backtrace):\n\n"
+				CALLCHAIN_REPORT_HELP
+				"\n\t\t\t\tDefault: " CALLCHAIN_DEFAULT_OPT;
+
+static int
+parse_callchain_opt(const struct option *opt, const char *arg, int unset)
+{
+	struct callchain_param *callchain = opt->value;
+
+	callchain->enabled = !unset;
+	/*
+	 * --no-call-graph
+	 */
+	if (unset) {
+		symbol_conf.use_callchain = false;
+		callchain->mode = CHAIN_NONE;
+		return 0;
+	}
+
+	return parse_callchain_report_opt(arg);
+}
+
+static int setup_callchain(struct perf_evlist *evlist)
+{
+	u64 sample_type = perf_evlist__combined_sample_type(evlist);
+	enum perf_call_graph_mode mode = CALLCHAIN_NONE;
+
+	if ((sample_type & PERF_SAMPLE_REGS_USER) &&
+	    (sample_type & PERF_SAMPLE_STACK_USER))
+		mode = CALLCHAIN_DWARF;
+	else if (sample_type & PERF_SAMPLE_BRANCH_STACK)
+		mode = CALLCHAIN_LBR;
+	else if (sample_type & PERF_SAMPLE_CALLCHAIN)
+		mode = CALLCHAIN_FP;
+
+	if (!callchain_param.enabled &&
+	    callchain_param.mode != CHAIN_NONE &&
+	    mode != CALLCHAIN_NONE) {
+		symbol_conf.use_callchain = true;
+		if (callchain_register_param(&callchain_param) < 0) {
+			ui__error("Can't register callchain params.\n");
+			return -EINVAL;
+		}
+	}
+
+	callchain_param.record_mode = mode;
+	callchain_param.min_percent = 0;
+	return 0;
+}
+
 static int perf_c2c__report(int argc, const char **argv)
 {
 	struct perf_session *session;
@@ -2124,6 +2182,7 @@ static int perf_c2c__report(int argc, const char **argv)
 	struct perf_data_file file = {
 		.mode = PERF_DATA_MODE_READ,
 	};
+	char callchain_default_opt[] = CALLCHAIN_DEFAULT_OPT;
 	const struct option c2c_options[] = {
 	OPT_STRING('k', "vmlinux", &symbol_conf.vmlinux_name,
 		   "file", "vmlinux pathname"),
@@ -2138,6 +2197,10 @@ static int perf_c2c__report(int argc, const char **argv)
 #endif
 	OPT_BOOLEAN(0, "stats", &c2c.stats_only,
 		    "Use the stdio interface"),
+	OPT_CALLBACK_DEFAULT('g', "call-graph", &callchain_param,
+			     "print_type,threshold[,print_limit],order,sort_key[,branch],value",
+			     callchain_help, &parse_callchain_opt,
+			     callchain_default_opt),
 	OPT_END()
 	};
 	int err = 0;
@@ -2179,6 +2242,10 @@ static int perf_c2c__report(int argc, const char **argv)
 		goto out;
 	}
 
+	err = setup_callchain(session->evlist);
+	if (err)
+		goto out_session;
+
 	if (symbol__init(&session->header.env) < 0)
 		goto out_session;