perf callchain: Support handling complete branch stacks as histograms

Currently branch stacks can be only shown as edge histograms for
individual branches. I never found this display particularly useful.

This implements an alternative mode that creates histograms over
complete branch traces, instead of individual branches, similar to how
normal callgraphs are handled. This is done by putting it in front of
the normal callgraph and then using the normal callgraph histogram
infrastructure to unify them.

This way in complex functions we can understand the control flow that
lead to a particular sample, and may even see some control flow in the
caller for short functions.

Example (simplified, of course for such simple code this is usually not
needed), please run this after the whole patchkit is in, as at this
point in the patch order there is no --branch-history, that will be
added in a patch after this one:

tcall.c:

volatile a = 10000, b = 100000, c;

__attribute__((noinline)) f2()
{
	c = a / b;
}

__attribute__((noinline)) f1()
{
	f2();
	f2();
}
main()
{
	int i;
	for (i = 0; i < 1000000; i++)
		f1();
}

% perf record -b -g ./tsrc/tcall
[ perf record: Woken up 1 times to write data ]
[ perf record: Captured and wrote 0.044 MB perf.data (~1923 samples) ]
% perf report --no-children --branch-history
...
    54.91%  tcall.c:6  [.] f2                      tcall
            |
            |--65.53%-- f2 tcall.c:5
            |          |
            |          |--70.83%-- f1 tcall.c:11
            |          |          f1 tcall.c:10
            |          |          main tcall.c:18
            |          |          main tcall.c:18
            |          |          main tcall.c:17
            |          |          main tcall.c:17
            |          |          f1 tcall.c:13
            |          |          f1 tcall.c:13
            |          |          f2 tcall.c:7
            |          |          f2 tcall.c:5
            |          |          f1 tcall.c:12
            |          |          f1 tcall.c:12
            |          |          f2 tcall.c:7
            |          |          f2 tcall.c:5
            |          |          f1 tcall.c:11
            |          |
            |           --29.17%-- f1 tcall.c:12
            |                     f1 tcall.c:12
            |                     f2 tcall.c:7
            |                     f2 tcall.c:5
            |                     f1 tcall.c:11
            |                     f1 tcall.c:10
            |                     main tcall.c:18
            |                     main tcall.c:18
            |                     main tcall.c:17
            |                     main tcall.c:17
            |                     f1 tcall.c:13
            |                     f1 tcall.c:13
            |                     f2 tcall.c:7
            |                     f2 tcall.c:5
            |                     f1 tcall.c:12

The default output is unchanged.

This is only implemented in perf report, no change to record or anywhere
else.

This adds the basic code to report:

- add a new "branch" option to the -g option parser to enable this mode
- when the flag is set include the LBR into the callstack in machine.c.

The rest of the history code is unchanged and doesn't know the
difference between LBR entry and normal call entry.

- detect overlaps with the callchain
- remove small loop duplicates in the LBR

Current limitations:

- The LBR flags (mispredict etc.) are not shown in the history
and LBR entries have no special marker.
- It would be nice if annotate marked the LBR entries somehow
(e.g. with arrows)

v2: Various fixes.
v3: Merge further patches into this one. Fix white space.
v4: Improve manpage. Address review feedback.
v5: Rename functions. Better error message without -g. Fix crash without
    -b.
v6: Rebase
v7: Rebase. Use NO_ENTRY in memset.
v8: Port to latest tip. Move add_callchain_ip to separate
    patch. Skip initial entries in callchain. Minor cleanups.

Signed-off-by: Andi Kleen <ak@linux.intel.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Link: http://lkml.kernel.org/r/1415844328-4884-3-git-send-email-andi@firstfloor.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

1 files changed, 117 insertions, 9 deletions

diff --git a/tools/perf/util/machine.c b/tools/perf/util/machine.c
index b75b487574c7..15dd0a9691ce 100644
--- a/tools/perf/util/machine.c
+++ b/tools/perf/util/machine.c
@@ -12,6 +12,7 @@
 #include <stdbool.h>
 #include <symbol/kallsyms.h>
 #include "unwind.h"
+#include "linux/hash.h"
 
 static void dsos__init(struct dsos *dsos)
 {
@@ -1391,7 +1392,11 @@ static int add_callchain_ip(struct thread *thread,
 
         al.filtered = 0;
         al.sym = NULL;
-        thread__find_addr_location(thread, cpumode, MAP__FUNCTION,
+        if (cpumode == -1)
+                thread__find_cpumode_addr_location(thread, MAP__FUNCTION,
+                                                   ip, &al);
+        else
+                thread__find_addr_location(thread, cpumode, MAP__FUNCTION,
                                    ip, &al);
         if (al.sym != NULL) {
                 if (sort__has_parent && !*parent &&
@@ -1427,8 +1432,50 @@ struct branch_info *sample__resolve_bstack(struct perf_sample *sample,
         return bi;
 }
 
+#define CHASHSZ 127
+#define CHASHBITS 7
+#define NO_ENTRY 0xff
+
+#define PERF_MAX_BRANCH_DEPTH 127
+
+/* Remove loops. */
+static int remove_loops(struct branch_entry *l, int nr)
+{
+        int i, j, off;
+        unsigned char chash[CHASHSZ];
+
+        memset(chash, NO_ENTRY, sizeof(chash));
+
+        BUG_ON(PERF_MAX_BRANCH_DEPTH > 255);
+
+        for (i = 0; i < nr; i++) {
+                int h = hash_64(l[i].from, CHASHBITS) % CHASHSZ;
+
+                /* no collision handling for now */
+                if (chash[h] == NO_ENTRY) {
+                        chash[h] = i;
+                } else if (l[chash[h]].from == l[i].from) {
+                        bool is_loop = true;
+                        /* check if it is a real loop */
+                        off = 0;
+                        for (j = chash[h]; j < i && i + off < nr; j++, off++)
+                                if (l[j].from != l[i + off].from) {
+                                        is_loop = false;
+                                        break;
+                                }
+                        if (is_loop) {
+                                memmove(l + i, l + i + off,
+                                        (nr - (i + off)) * sizeof(*l));
+                                nr -= off;
+                        }
+                }
+        }
+        return nr;
+}
+
 static int thread__resolve_callchain_sample(struct thread *thread,
                                              struct ip_callchain *chain,
+                                             struct branch_stack *branch,
                                              struct symbol **parent,
                                              struct addr_location *root_al,
                                              int max_stack)
@@ -1438,22 +1485,82 @@ static int thread__resolve_callchain_sample(struct thread *thread,
         int i;
         int j;
         int err;
-        int skip_idx __maybe_unused;
+        int skip_idx = -1;
+        int first_call = 0;
+
+        /*
+         * Based on DWARF debug information, some architectures skip
+         * a callchain entry saved by the kernel.
+         */
+        if (chain->nr < PERF_MAX_STACK_DEPTH)
+                skip_idx = arch_skip_callchain_idx(thread, chain);
 
         callchain_cursor_reset(&callchain_cursor);
 
+        /*
+         * Add branches to call stack for easier browsing. This gives
+         * more context for a sample than just the callers.
+         *
+         * This uses individual histograms of paths compared to the
+         * aggregated histograms the normal LBR mode uses.
+         *
+         * Limitations for now:
+         * - No extra filters
+         * - No annotations (should annotate somehow)
+         */
+
+        if (branch && callchain_param.branch_callstack) {
+                int nr = min(max_stack, (int)branch->nr);
+                struct branch_entry be[nr];
+
+                if (branch->nr > PERF_MAX_BRANCH_DEPTH) {
+                        pr_warning("corrupted branch chain. skipping...\n");
+                        goto check_calls;
+                }
+
+                for (i = 0; i < nr; i++) {
+                        if (callchain_param.order == ORDER_CALLEE) {
+                                be[i] = branch->entries[i];
+                                /*
+                                 * Check for overlap into the callchain.
+                                 * The return address is one off compared to
+                                 * the branch entry. To adjust for this
+                                 * assume the calling instruction is not longer
+                                 * than 8 bytes.
+                                 */
+                                if (i == skip_idx ||
+                                    chain->ips[first_call] >= PERF_CONTEXT_MAX)
+                                        first_call++;
+                                else if (be[i].from < chain->ips[first_call] &&
+                                    be[i].from >= chain->ips[first_call] - 8)
+                                        first_call++;
+                        } else
+                                be[i] = branch->entries[branch->nr - i - 1];
+                }
+
+                nr = remove_loops(be, nr);
+
+                for (i = 0; i < nr; i++) {
+                        err = add_callchain_ip(thread, parent, root_al,
+                                               -1, be[i].to);
+                        if (!err)
+                                err = add_callchain_ip(thread, parent, root_al,
+                                                       -1, be[i].from);
+                        if (err == -EINVAL)
+                                break;
+                        if (err)
+                                return err;
+                }
+                chain_nr -= nr;
+        }
+
+check_calls:
         if (chain->nr > PERF_MAX_STACK_DEPTH) {
                 pr_warning("corrupted callchain. skipping...\n");
                 return 0;
         }
 
-        /*
-         * Based on DWARF debug information, some architectures skip
-         * a callchain entry saved by the kernel.
-         */
-        skip_idx = arch_skip_callchain_idx(thread, chain);
-
-        for (i = 0; i < chain_nr; i++) {
+        for (i = first_call; i < chain_nr; i++) {
                 u64 ip;
 
                 if (callchain_param.order == ORDER_CALLEE)
@@ -1517,6 +1624,7 @@ int thread__resolve_callchain(struct thread *thread,
                               int max_stack)
 {
         int ret = thread__resolve_callchain_sample(thread, sample->callchain,
+                                                   sample->branch_stack,
                                                    parent, root_al, max_stack);
         if (ret)
                 return ret;