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perf callchain: Support handling complete branch stacks as histograms

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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>
This commit is contained in:
Andi Kleen 2014-11-12 18:05:20 -08:00 committed by Arnaldo Carvalho de Melo
parent 6c0345b73b
commit 8b7bad58ef
6 changed files with 134 additions and 15 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

7
tools/perf/Documentation/perf-report.txt
View File

@ -159,7 +159,7 @@ OPTIONS
--dump-raw-trace::
Dump raw trace in ASCII.
-g [type,min[,limit],order[,key]]::
-g [type,min[,limit],order[,key][,branch]]::
--call-graph::
Display call chains using type, min percent threshold, optional print
limit and order.
@ -177,6 +177,11 @@ OPTIONS
- function: compare on functions
- address: compare on individual code addresses
branch can be:
- branch: include last branch information in callgraph
when available. Usually more convenient to use --branch-history
for this.
Default: fractal,0.5,callee,function.
--children::

4
tools/perf/builtin-report.c
View File

@ -637,8 +637,8 @@ int cmd_report(int argc, const char **argv, const char *prefix __maybe_unused)
"regex filter to identify parent, see: '--sort parent'"),
OPT_BOOLEAN('x', "exclude-other", &symbol_conf.exclude_other,
"Only display entries with parent-match"),
OPT_CALLBACK_DEFAULT('g', "call-graph", &report, "output_type,min_percent[,print_limit],call_order",
"Display callchains using output_type (graph, flat, fractal, or none) , min percent threshold, optional print limit, callchain order, key (function or address). "
OPT_CALLBACK_DEFAULT('g', "call-graph", &report, "output_type,min_percent[,print_limit],call_order[,branch]",
"Display callchains using output_type (graph, flat, fractal, or none) , min percent threshold, optional print limit, callchain order, key (function or address), add branches. "
"Default: fractal,0.5,callee,function", &report_parse_callchain_opt, callchain_default_opt),
OPT_BOOLEAN(0, "children", &symbol_conf.cumulate_callchain,
"Accumulate callchains of children and show total overhead as well"),

4
tools/perf/util/callchain.c
View File

@ -149,6 +149,10 @@ static int parse_callchain_sort_key(const char *value)
callchain_param.key = CCKEY_ADDRESS;
return 0;
}
if (!strncmp(value, "branch", strlen(value))) {
callchain_param.branch_callstack = 1;
return 0;
}
return -1;
}

1
tools/perf/util/callchain.h
View File

@ -63,6 +63,7 @@ struct callchain_param {
sort_chain_func_t sort;
enum chain_order order;
enum chain_key key;
bool branch_callstack;
};
extern struct callchain_param callchain_param;

130
tools/perf/util/machine.c
View File

@ -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;
callchain_cursor_reset(&callchain_cursor);
if (chain->nr > PERF_MAX_STACK_DEPTH) {
pr_warning("corrupted callchain. skipping...\n");
return 0;
}
int skip_idx = -1;
int first_call = 0;
/*
* Based on DWARF debug information, some architectures skip
* a callchain entry saved by the kernel.
*/
skip_idx = arch_skip_callchain_idx(thread, chain);
if (chain->nr < PERF_MAX_STACK_DEPTH)
skip_idx = arch_skip_callchain_idx(thread, chain);
for (i = 0; i < chain_nr; i++) {
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;
}
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;

3
tools/perf/util/symbol.h
View File

@ -102,7 +102,8 @@ struct symbol_conf {
demangle,
demangle_kernel,
filter_relative,
show_hist_headers;
show_hist_headers,
branch_callstack;
const char *vmlinux_name,
*kallsyms_name,
*source_prefix,