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authorKan Liang <kan.liang@linux.intel.com>2022-03-21 07:00:12 -0700
committerArnaldo Carvalho de Melo <acme@redhat.com>2022-03-22 18:00:45 -0300
commit6f680c6aa276ceff7dde98d5ae3f19574cd12eff (patch)
tree3c40c8b4af2e583b598b665142a815310c5b56bf /tools/perf
parentperf parse-events: Move slots only with topdown (diff)
downloadlinux-dev-6f680c6aa276ceff7dde98d5ae3f19574cd12eff.tar.xz
linux-dev-6f680c6aa276ceff7dde98d5ae3f19574cd12eff.zip
perf script: Add 'brstackinsnlen' for branch stacks
When analyzing with 'perf script', it's useful to understand the captured instruction and the next sequential instruction. To calculate the address of the next sequential instruction, the length of the captured instruction is required. For example, you can’t know the next sequential instruction after an unconditional branch unless you calculate that based on its length. For branch stacks, 'perf script' only prints the instruction bytes with 'brstackinsn', but lacks the instruction length. Add 'brstackinsnlen' to print the instruction length. $ perf script -F ip,brstackinsn,brstackinsnlen --xed 7fa555be8f75 _start: 00007fa555be8090 mov %rsp, %rdi ilen: 3 00007fa555be8093 callq 0x7fa555be8ea0 ilen: 5 # PRED 102 cycles [102] 0.02 IPC _dl_start+38: 00007fa555be8ec6 movq %rdx,0x227853(%rip) ilen: 7 00007fa555be8ecd leaq 0x227f94(%rip),%rdx ilen: 7 Signed-off-by: Kan Liang <kan.liang@linux.intel.com> Cc: Ahmad Yasin <ahmad.yasin@intel.com> Cc: Andi Kleen <ak@linux.intel.com> Cc: Ingo Molnar <mingo@redhat.com> Cc: Jiri Olsa <jolsa@kernel.org> Cc: Namhyung Kim <namhyung@kernel.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Xing Zhengjun <zhengjun.xing@linux.intel.com> Link: https://lore.kernel.org/r/1647871212-184070-1-git-send-email-kan.liang@linux.intel.com [ Added the new field to tools/perf/Documentation/perf-script.txt ] Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Diffstat (limited to 'tools/perf')
-rw-r--r--tools/perf/Documentation/perf-script.txt8
-rw-r--r--tools/perf/builtin-script.c44
2 files changed, 38 insertions, 14 deletions
diff --git a/tools/perf/Documentation/perf-script.txt b/tools/perf/Documentation/perf-script.txt
index afd4718475c9..2012a8e6c90b 100644
--- a/tools/perf/Documentation/perf-script.txt
+++ b/tools/perf/Documentation/perf-script.txt
@@ -129,8 +129,8 @@ OPTIONS
Comma separated list of fields to print. Options are:
comm, tid, pid, time, cpu, event, trace, ip, sym, dso, addr, symoff,
srcline, period, iregs, uregs, brstack, brstacksym, flags, bpf-output,
- brstackinsn, brstackoff, callindent, insn, insnlen, synth, phys_addr,
- metric, misc, srccode, ipc, data_page_size, code_page_size, ins_lat.
+ brstackinsn, brstackinsnlen, brstackoff, callindent, insn, insnlen, synth,
+ phys_addr, metric, misc, srccode, ipc, data_page_size, code_page_size, ins_lat.
Field list can be prepended with the type, trace, sw or hw,
to indicate to which event type the field list applies.
e.g., -F sw:comm,tid,time,ip,sym and -F trace:time,cpu,trace
@@ -241,6 +241,10 @@ OPTIONS
is printed. This is the full execution path leading to the sample. This is only supported when the
sample was recorded with perf record -b or -j any.
+ Use brstackinsnlen to print the brstackinsn lenght. For example, you
+ can’t know the next sequential instruction after an unconditional branch unless
+ you calculate that based on its length.
+
The brstackoff field will print an offset into a specific dso/binary.
With the metric option perf script can compute metrics for
diff --git a/tools/perf/builtin-script.c b/tools/perf/builtin-script.c
index 88c52d49852c..f12dc5ed354d 100644
--- a/tools/perf/builtin-script.c
+++ b/tools/perf/builtin-script.c
@@ -124,6 +124,7 @@ enum perf_output_field {
PERF_OUTPUT_DATA_PAGE_SIZE = 1ULL << 33,
PERF_OUTPUT_CODE_PAGE_SIZE = 1ULL << 34,
PERF_OUTPUT_INS_LAT = 1ULL << 35,
+ PERF_OUTPUT_BRSTACKINSNLEN = 1ULL << 36,
};
struct perf_script {
@@ -191,6 +192,7 @@ struct output_option {
{.str = "data_page_size", .field = PERF_OUTPUT_DATA_PAGE_SIZE},
{.str = "code_page_size", .field = PERF_OUTPUT_CODE_PAGE_SIZE},
{.str = "ins_lat", .field = PERF_OUTPUT_INS_LAT},
+ {.str = "brstackinsnlen", .field = PERF_OUTPUT_BRSTACKINSNLEN},
};
enum {
@@ -488,7 +490,7 @@ static int evsel__check_attr(struct evsel *evsel, struct perf_session *session)
"selected. Hence, no address to lookup the source line number.\n");
return -EINVAL;
}
- if (PRINT_FIELD(BRSTACKINSN) && !allow_user_set &&
+ if ((PRINT_FIELD(BRSTACKINSN) || PRINT_FIELD(BRSTACKINSNLEN)) && !allow_user_set &&
!(evlist__combined_branch_type(session->evlist) & PERF_SAMPLE_BRANCH_ANY)) {
pr_err("Display of branch stack assembler requested, but non all-branch filter set\n"
"Hint: run 'perf record -b ...'\n");
@@ -1120,10 +1122,17 @@ static int print_srccode(struct thread *thread, u8 cpumode, uint64_t addr)
static int ip__fprintf_jump(uint64_t ip, struct branch_entry *en,
struct perf_insn *x, u8 *inbuf, int len,
- int insn, FILE *fp, int *total_cycles)
+ int insn, FILE *fp, int *total_cycles,
+ struct perf_event_attr *attr)
{
- int printed = fprintf(fp, "\t%016" PRIx64 "\t%-30s\t#%s%s%s%s", ip,
- dump_insn(x, ip, inbuf, len, NULL),
+ int ilen = 0;
+ int printed = fprintf(fp, "\t%016" PRIx64 "\t%-30s\t", ip,
+ dump_insn(x, ip, inbuf, len, &ilen));
+
+ if (PRINT_FIELD(BRSTACKINSNLEN))
+ printed += fprintf(fp, "ilen: %d\t", ilen);
+
+ printed += fprintf(fp, "#%s%s%s%s",
en->flags.predicted ? " PRED" : "",
en->flags.mispred ? " MISPRED" : "",
en->flags.in_tx ? " INTX" : "",
@@ -1209,7 +1218,8 @@ static int perf_sample__fprintf_brstackinsn(struct perf_sample *sample,
printed += ip__fprintf_sym(entries[nr - 1].from, thread,
x.cpumode, x.cpu, &lastsym, attr, fp);
printed += ip__fprintf_jump(entries[nr - 1].from, &entries[nr - 1],
- &x, buffer, len, 0, fp, &total_cycles);
+ &x, buffer, len, 0, fp, &total_cycles,
+ attr);
if (PRINT_FIELD(SRCCODE))
printed += print_srccode(thread, x.cpumode, entries[nr - 1].from);
}
@@ -1240,14 +1250,17 @@ static int perf_sample__fprintf_brstackinsn(struct perf_sample *sample,
printed += ip__fprintf_sym(ip, thread, x.cpumode, x.cpu, &lastsym, attr, fp);
if (ip == end) {
printed += ip__fprintf_jump(ip, &entries[i], &x, buffer + off, len - off, ++insn, fp,
- &total_cycles);
+ &total_cycles, attr);
if (PRINT_FIELD(SRCCODE))
printed += print_srccode(thread, x.cpumode, ip);
break;
} else {
ilen = 0;
- printed += fprintf(fp, "\t%016" PRIx64 "\t%s\n", ip,
+ printed += fprintf(fp, "\t%016" PRIx64 "\t%s", ip,
dump_insn(&x, ip, buffer + off, len - off, &ilen));
+ if (PRINT_FIELD(BRSTACKINSNLEN))
+ printed += fprintf(fp, "\tilen: %d", ilen);
+ printed += fprintf(fp, "\n");
if (ilen == 0)
break;
if (PRINT_FIELD(SRCCODE))
@@ -1290,16 +1303,23 @@ static int perf_sample__fprintf_brstackinsn(struct perf_sample *sample,
machine, thread, &x.is64bit, &x.cpumode, false);
if (len <= 0)
goto out;
- printed += fprintf(fp, "\t%016" PRIx64 "\t%s\n", sample->ip,
- dump_insn(&x, sample->ip, buffer, len, NULL));
+ ilen = 0;
+ printed += fprintf(fp, "\t%016" PRIx64 "\t%s", sample->ip,
+ dump_insn(&x, sample->ip, buffer, len, &ilen));
+ if (PRINT_FIELD(BRSTACKINSNLEN))
+ printed += fprintf(fp, "\tilen: %d", ilen);
+ printed += fprintf(fp, "\n");
if (PRINT_FIELD(SRCCODE))
print_srccode(thread, x.cpumode, sample->ip);
goto out;
}
for (off = 0; off <= end - start; off += ilen) {
ilen = 0;
- printed += fprintf(fp, "\t%016" PRIx64 "\t%s\n", start + off,
+ printed += fprintf(fp, "\t%016" PRIx64 "\t%s", start + off,
dump_insn(&x, start + off, buffer + off, len - off, &ilen));
+ if (PRINT_FIELD(BRSTACKINSNLEN))
+ printed += fprintf(fp, "\tilen: %d", ilen);
+ printed += fprintf(fp, "\n");
if (ilen == 0)
break;
if (arch_is_branch(buffer + off, len - off, x.is64bit) && start + off != sample->ip) {
@@ -1457,7 +1477,7 @@ static int perf_sample__fprintf_insn(struct perf_sample *sample,
for (i = 0; i < sample->insn_len; i++)
printed += fprintf(fp, " %02x", (unsigned char)sample->insn[i]);
}
- if (PRINT_FIELD(BRSTACKINSN))
+ if (PRINT_FIELD(BRSTACKINSN) || PRINT_FIELD(BRSTACKINSNLEN))
printed += perf_sample__fprintf_brstackinsn(sample, thread, attr, machine, fp);
return printed;
@@ -3776,7 +3796,7 @@ int cmd_script(int argc, const char **argv)
"Valid types: hw,sw,trace,raw,synth. "
"Fields: comm,tid,pid,time,cpu,event,trace,ip,sym,dso,"
"addr,symoff,srcline,period,iregs,uregs,brstack,"
- "brstacksym,flags,bpf-output,brstackinsn,brstackoff,"
+ "brstacksym,flags,bpf-output,brstackinsn,brstackinsnlen,brstackoff,"
"callindent,insn,insnlen,synth,phys_addr,metric,misc,ipc,tod,"
"data_page_size,code_page_size,ins_lat",
parse_output_fields),