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Date: Mon, 20 Apr 2020 08:53:07 -0300
From: Arnaldo Carvalho de Melo <acme@...nel.org>
To: Ingo Molnar <mingo@...nel.org>,
Thomas Gleixner <tglx@...utronix.de>
Cc: Jiri Olsa <jolsa@...nel.org>, Namhyung Kim <namhyung@...nel.org>,
Clark Williams <williams@...hat.com>,
linux-kernel@...r.kernel.org, linux-perf-users@...r.kernel.org,
Kan Liang <kan.liang@...ux.intel.com>,
Andi Kleen <ak@...ux.intel.com>, Jiri Olsa <jolsa@...hat.com>,
Adrian Hunter <adrian.hunter@...el.com>,
Alexey Budankov <alexey.budankov@...ux.intel.com>,
Mathieu Poirier <mathieu.poirier@...aro.org>,
Michael Ellerman <mpe@...erman.id.au>,
Pavel Gerasimov <pavel.gerasimov@...el.com>,
Peter Zijlstra <peterz@...radead.org>,
Ravi Bangoria <ravi.bangoria@...ux.ibm.com>,
Stephane Eranian <eranian@...gle.com>,
Vitaly Slobodskoy <vitaly.slobodskoy@...el.com>,
Arnaldo Carvalho de Melo <acme@...hat.com>
Subject: [PATCH 51/60] perf machine: Factor out lbr_callchain_add_lbr_ip()
From: Kan Liang <kan.liang@...ux.intel.com>
Both caller and callee needs to add ip from LBR to callchain.
Factor out lbr_callchain_add_lbr_ip() to improve code readability.
Signed-off-by: Kan Liang <kan.liang@...ux.intel.com>
Reviewed-by: Andi Kleen <ak@...ux.intel.com>
Acked-by: Jiri Olsa <jolsa@...hat.com>
Cc: Adrian Hunter <adrian.hunter@...el.com>
Cc: Alexey Budankov <alexey.budankov@...ux.intel.com>
Cc: Mathieu Poirier <mathieu.poirier@...aro.org>
Cc: Michael Ellerman <mpe@...erman.id.au>
Cc: Namhyung Kim <namhyung@...nel.org>
Cc: Pavel Gerasimov <pavel.gerasimov@...el.com>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Ravi Bangoria <ravi.bangoria@...ux.ibm.com>
Cc: Stephane Eranian <eranian@...gle.com>
Cc: Vitaly Slobodskoy <vitaly.slobodskoy@...el.com>
Link: http://lore.kernel.org/lkml/20200319202517.23423-9-kan.liang@linux.intel.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@...hat.com>
---
tools/perf/util/machine.c | 143 +++++++++++++++++++-------------------
1 file changed, 73 insertions(+), 70 deletions(-)
diff --git a/tools/perf/util/machine.c b/tools/perf/util/machine.c
index a7f75fd43b0f..f9d69fce584a 100644
--- a/tools/perf/util/machine.c
+++ b/tools/perf/util/machine.c
@@ -2224,6 +2224,74 @@ static int lbr_callchain_add_kernel_ip(struct thread *thread,
return 0;
}
+static int lbr_callchain_add_lbr_ip(struct thread *thread,
+ struct callchain_cursor *cursor,
+ struct perf_sample *sample,
+ struct symbol **parent,
+ struct addr_location *root_al,
+ u64 *branch_from,
+ bool callee)
+{
+ struct branch_stack *lbr_stack = sample->branch_stack;
+ struct branch_entry *entries = perf_sample__branch_entries(sample);
+ u8 cpumode = PERF_RECORD_MISC_USER;
+ int lbr_nr = lbr_stack->nr;
+ struct branch_flags *flags;
+ int err, i;
+ u64 ip;
+
+ if (callee) {
+ /* Add LBR ip from first entries.to */
+ ip = entries[0].to;
+ flags = &entries[0].flags;
+ *branch_from = entries[0].from;
+ err = add_callchain_ip(thread, cursor, parent,
+ root_al, &cpumode, ip,
+ true, flags, NULL,
+ *branch_from);
+ if (err)
+ return err;
+
+ /* Add LBR ip from entries.from one by one. */
+ for (i = 0; i < lbr_nr; i++) {
+ ip = entries[i].from;
+ flags = &entries[i].flags;
+ err = add_callchain_ip(thread, cursor, parent,
+ root_al, &cpumode, ip,
+ true, flags, NULL,
+ *branch_from);
+ if (err)
+ return err;
+ }
+ return 0;
+ }
+
+ /* Add LBR ip from entries.from one by one. */
+ for (i = lbr_nr - 1; i >= 0; i--) {
+ ip = entries[i].from;
+ flags = &entries[i].flags;
+ err = add_callchain_ip(thread, cursor, parent,
+ root_al, &cpumode, ip,
+ true, flags, NULL,
+ *branch_from);
+ if (err)
+ return err;
+ }
+
+ /* Add LBR ip from first entries.to */
+ ip = entries[0].to;
+ flags = &entries[0].flags;
+ *branch_from = entries[0].from;
+ err = add_callchain_ip(thread, cursor, parent,
+ root_al, &cpumode, ip,
+ true, flags, NULL,
+ *branch_from);
+ if (err)
+ return err;
+
+ return 0;
+}
+
/*
* Recolve LBR callstack chain sample
* Return:
@@ -2240,14 +2308,7 @@ static int resolve_lbr_callchain_sample(struct thread *thread,
{
struct ip_callchain *chain = sample->callchain;
int chain_nr = min(max_stack, (int)chain->nr), i;
- u8 cpumode = PERF_RECORD_MISC_USER;
- u64 ip, branch_from = 0;
- struct branch_stack *lbr_stack;
- struct branch_entry *entries;
- int lbr_nr, j, k;
- bool branch;
- struct branch_flags *flags;
- int mix_chain_nr;
+ u64 branch_from = 0;
int err;
for (i = 0; i < chain_nr; i++) {
@@ -2259,21 +2320,6 @@ static int resolve_lbr_callchain_sample(struct thread *thread,
if (i == chain_nr)
return 0;
- lbr_stack = sample->branch_stack;
- entries = perf_sample__branch_entries(sample);
- lbr_nr = lbr_stack->nr;
- /*
- * LBR callstack can only get user call chain.
- * The mix_chain_nr is kernel call chain
- * number plus LBR user call chain number.
- * i is kernel call chain number,
- * 1 is PERF_CONTEXT_USER,
- * lbr_nr + 1 is the user call chain number.
- * For details, please refer to the comments
- * in callchain__printf
- */
- mix_chain_nr = i + 1 + lbr_nr + 1;
-
if (callchain_param.order == ORDER_CALLEE) {
/* Add kernel ip */
err = lbr_callchain_add_kernel_ip(thread, cursor, sample,
@@ -2282,57 +2328,14 @@ static int resolve_lbr_callchain_sample(struct thread *thread,
if (err)
goto error;
- /* Add LBR ip from first entries.to */
- ip = entries[0].to;
- branch = true;
- flags = &entries[0].flags;
- branch_from = entries[0].from;
- err = add_callchain_ip(thread, cursor, parent,
- root_al, &cpumode, ip,
- branch, flags, NULL,
- branch_from);
+ err = lbr_callchain_add_lbr_ip(thread, cursor, sample, parent,
+ root_al, &branch_from, true);
if (err)
goto error;
- /* Add LBR ip from entries.from one by one. */
- for (j = i + 2; j < mix_chain_nr; j++) {
- k = j - i - 2;
- ip = entries[k].from;
- branch = true;
- flags = &entries[k].flags;
-
- err = add_callchain_ip(thread, cursor, parent,
- root_al, &cpumode, ip,
- branch, flags, NULL,
- branch_from);
- if (err)
- goto error;
- }
} else {
- /* Add LBR ip from entries.from one by one. */
- for (j = 0; j < lbr_nr; j++) {
- k = lbr_nr - j - 1;
- ip = entries[k].from;
- branch = true;
- flags = &entries[k].flags;
-
- err = add_callchain_ip(thread, cursor, parent,
- root_al, &cpumode, ip,
- branch, flags, NULL,
- branch_from);
- if (err)
- goto error;
- }
-
- /* Add LBR ip from first entries.to */
- ip = entries[0].to;
- branch = true;
- flags = &entries[0].flags;
- branch_from = entries[0].from;
- err = add_callchain_ip(thread, cursor, parent,
- root_al, &cpumode, ip,
- branch, flags, NULL,
- branch_from);
+ err = lbr_callchain_add_lbr_ip(thread, cursor, sample, parent,
+ root_al, &branch_from, false);
if (err)
goto error;
--
2.21.1
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