[PATCH v6 5/8] perf cs-etm: Support call indentation
Leo Yan
leo.yan at arm.com
Tue May 26 09:59:41 PDT 2026
From: Leo Yan <leo.yan at linaro.org>
This commit supports the field "callindent" to reflect the call stack
depth.
The branch stack is used by both call indentation and the last branch
record, which are separate features. Use a new flag "use_br_stack" to
track whether the branch stack needs to be recorded.
Before:
perf script -F +callindent
callchain_test 9187 [002] 599611.826599: 1 branches: main ffff83312258 __libc_start_call_main+0x78 (/usr/lib/aarch64-linux-gnu/libc.so.6)
callchain_test 9187 [002] 599611.826599: 1 branches: foo aaaae3ed07c4 main+0x8 (/home/kernel/leoy/test_cs_callchain/callchain_test)
callchain_test 9187 [002] 599611.826599: 1 branches: print aaaae3ed07ac foo+0x8 (/home/kernel/leoy/test_cs_callchain/callchain_test)
callchain_test 9187 [002] 599611.826599: 1 branches: do_svc aaaae3ed0794 print+0x8 (/home/kernel/leoy/test_cs_callchain/callchain_test)
callchain_test 9187 [002] 599611.826599: 1 branches: aaaae3ed077c do_svc+0x14 (/home/kernel/leoy/test_cs_callchain/callchain_test)
callchain_test 9187 [002] 599611.826599: 1 branches: vectors aaaae3ed0780 do_svc+0x18 (/home/kernel/leoy/test_cs_callchain/callchain_test)
callchain_test 9187 [002] 599611.826599: 1 branches: ffff800080010c00 vectors+0x400 ([kernel.kallsyms])
callchain_test 9187 [002] 599611.826600: 1 branches: ffff800080010c24 vectors+0x424 ([kernel.kallsyms])
callchain_test 9187 [002] 599611.826600: 1 branches: ffff8000800114dc el0t_64_sync+0xd4 ([kernel.kallsyms])
callchain_test 9187 [002] 599611.826600: 1 branches: ffff8000800114f8 el0t_64_sync+0xf0 ([kernel.kallsyms])
callchain_test 9187 [002] 599611.826600: 1 branches: ffff800080011528 el0t_64_sync+0x120 ([kernel.kallsyms])
callchain_test 9187 [002] 599611.826600: 1 branches: ffff800080011538 el0t_64_sync+0x130 ([kernel.kallsyms])
callchain_test 9187 [002] 599611.826601: 1 branches: ffff800080011568 el0t_64_sync+0x160 ([kernel.kallsyms])
callchain_test 9187 [002] 599611.826601: 1 branches: el0t_64_sync_handler ffff80008001159c el0t_64_sync+0x194 ([kernel.kallsyms])
callchain_test 9187 [002] 599611.826601: 1 branches: ffff800081829110 el0t_64_sync_handler+0x18 ([kernel.kallsyms])
callchain_test 9187 [002] 599611.826601: 1 branches: el0t_64_sync_handler ffff800081829140 el0t_64_sync_handler+0x48 ([kernel.kallsyms])
callchain_test 9187 [002] 599611.826601: 1 branches: el0_svc ffff800081829194 el0t_64_sync_handler+0x9c ([kernel.kallsyms])
After:
callchain_test 9187 [002] 599611.826599: 1 branches: main ffff83312258 __libc_start_call_main+0x78 (/usr/lib/aarch64-linux-gnu/libc.so.6)
callchain_test 9187 [002] 599611.826599: 1 branches: foo aaaae3ed07c4 main+0x8 (/home/kernel/leoy/test_cs_callchain/callchain_test)
callchain_test 9187 [002] 599611.826599: 1 branches: print aaaae3ed07ac foo+0x8 (/home/kernel/leoy/test_cs_callchain/callchain_test)
callchain_test 9187 [002] 599611.826599: 1 branches: do_svc aaaae3ed0794 print+0x8 (/home/kernel/leoy/test_cs_callchain/callchain_test)
callchain_test 9187 [002] 599611.826599: 1 branches: aaaae3ed077c do_svc+0x14 (/home/kernel/leoy/test_cs_callchain/callchain_test)
callchain_test 9187 [002] 599611.826599: 1 branches: vectors aaaae3ed0780 do_svc+0x18 (/home/kernel/leoy/test_cs_callchain/callchain_test)
callchain_test 9187 [002] 599611.826599: 1 branches: ffff800080010c00 vectors+0x400 ([kernel.kallsyms])
callchain_test 9187 [002] 599611.826600: 1 branches: ffff800080010c24 vectors+0x424 ([kernel.kallsyms])
callchain_test 9187 [002] 599611.826600: 1 branches: ffff8000800114dc el0t_64_sync+0xd4 ([kernel.kallsyms])
callchain_test 9187 [002] 599611.826600: 1 branches: ffff8000800114f8 el0t_64_sync+0xf0 ([kernel.kallsyms])
callchain_test 9187 [002] 599611.826600: 1 branches: ffff800080011528 el0t_64_sync+0x120 ([kernel.kallsyms])
callchain_test 9187 [002] 599611.826600: 1 branches: ffff800080011538 el0t_64_sync+0x130 ([kernel.kallsyms])
callchain_test 9187 [002] 599611.826601: 1 branches: ffff800080011568 el0t_64_sync+0x160 ([kernel.kallsyms])
callchain_test 9187 [002] 599611.826601: 1 branches: el0t_64_sync_handler ffff80008001159c el0t_64_sync+0x194 ([kernel.kallsyms])
callchain_test 9187 [002] 599611.826601: 1 branches: ffff800081829110 el0t_64_sync_handler+0x18 ([kernel.kallsyms])
callchain_test 9187 [002] 599611.826601: 1 branches: el0t_64_sync_handler ffff800081829140 el0t_64_sync_handler+0x48 ([kernel.kallsyms])
callchain_test 9187 [002] 599611.826601: 1 branches: el0_svc ffff800081829194 el0t_64_sync_handler+0x9c ([kernel.kallsyms])
Signed-off-by: Leo Yan <leo.yan at linaro.org>
Signed-off-by: Leo Yan <leo.yan at arm.com>
---
tools/perf/util/cs-etm.c | 14 ++++++++++----
1 file changed, 10 insertions(+), 4 deletions(-)
diff --git a/tools/perf/util/cs-etm.c b/tools/perf/util/cs-etm.c
index ea2424175558ddc0a6f20a9de6c30f377facdc52..b31d0dd46a45dc365edd7c2f9e9b2eb077ca23db 100644
--- a/tools/perf/util/cs-etm.c
+++ b/tools/perf/util/cs-etm.c
@@ -66,6 +66,7 @@ struct cs_etm_auxtrace {
bool snapshot_mode;
bool data_queued;
bool has_virtual_ts; /* Virtual/Kernel timestamps in the trace. */
+ bool use_thread_stack;
int num_cpu;
u64 latest_kernel_timestamp;
@@ -626,7 +627,7 @@ static int cs_etm__init_traceid_queue(struct cs_etm_queue *etmq,
if (!tidq->prev_packet)
goto out_free;
- if (etm->synth_opts.last_branch) {
+ if (etm->use_thread_stack) {
size_t sz = sizeof(struct branch_stack);
sz += etm->synth_opts.last_branch_sz *
@@ -1505,7 +1506,7 @@ static void cs_etm__add_stack_event(struct cs_etm_queue *etmq,
tidq->packet->sample_type != CS_ETM_RANGE)
return;
- if (etmq->etm->synth_opts.last_branch) {
+ if (etmq->etm->use_thread_stack) {
from = cs_etm__last_executed_instr(tidq->prev_packet);
to = cs_etm__first_executed_instr(tidq->packet);
@@ -1914,7 +1915,7 @@ static int cs_etm__flush(struct cs_etm_queue *etmq,
cs_etm__packet_swap(etm, tidq);
/* Reset last branches after flush the trace */
- if (etm->synth_opts.last_branch)
+ if (etm->use_thread_stack)
thread_stack__flush(tidq->thread);
return err;
@@ -1977,7 +1978,7 @@ static void cs_etm__flush_all_stack(struct cs_etm_queue *etmq)
{
enum cs_etm_pid_fmt pid_fmt = cs_etm__get_pid_fmt(etmq);
- if (!etmq->etm->synth_opts.last_branch)
+ if (!etmq->etm->use_thread_stack)
return;
cs_etm__flush_machine_stack(etmq, HOST_KERNEL_ID);
@@ -3438,6 +3439,7 @@ int cs_etm__process_auxtrace_info_full(union perf_event *event,
itrace_synth_opts__set_default(&etm->synth_opts,
session->itrace_synth_opts->default_no_sample);
etm->synth_opts.callchain = false;
+ etm->synth_opts.thread_stack = session->itrace_synth_opts->thread_stack;
}
etm->session = session;
@@ -3489,6 +3491,10 @@ int cs_etm__process_auxtrace_info_full(union perf_event *event,
etm->tc.cap_user_time_zero = tc->cap_user_time_zero;
etm->tc.cap_user_time_short = tc->cap_user_time_short;
}
+
+ etm->use_thread_stack = etm->synth_opts.thread_stack ||
+ etm->synth_opts.last_branch;
+
err = cs_etm__synth_events(etm, session);
if (err)
goto err_free_queues;
--
2.34.1
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