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perf script: Support instruction latency 

The instruction latency information can be recorded on
some platforms, e.g., the Intel Sapphire Rapids server. With both memory
latency (weight) and the new instruction latency information, users can
easily locate the expensive load instructions, and also understand the time
spent in different stages. The users can optimize their applications in
different pipeline stages.

Add a new field "ins_lat" to filter the instruction latency information,
which is available with sample type PERF_SAMPLE_WEIGHT_STRUCT.

Signed-off-by: Kan Liang <kan.liang@linux.intel.com>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Joe Mario <jmario@redhat.com>
Link: https://lore.kernel.org/r/1632929894-102778-2-git-send-email-kan.liang@linux.intel.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Kan Liang 2021-09-29 08:38:14 -07:00 committed by Arnaldo Carvalho de Melo
parent 57d7ecfd11
commit 6ea5d1a3e3
2 changed files with 13 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
tools/perf/Documentation/perf-script.txt
View File

@ -130,7 +130,7 @@ OPTIONS
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.
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

14
tools/perf/builtin-script.c
View File

@ -122,6 +122,7 @@ enum perf_output_field {
PERF_OUTPUT_TOD = 1ULL << 32,
PERF_OUTPUT_DATA_PAGE_SIZE = 1ULL << 33,
PERF_OUTPUT_CODE_PAGE_SIZE = 1ULL << 34,
PERF_OUTPUT_INS_LAT = 1ULL << 35,
};
struct perf_script {
@ -188,6 +189,7 @@ struct output_option {
{.str = "tod", .field = PERF_OUTPUT_TOD},
{.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},
};
enum {
@ -262,7 +264,8 @@ static struct {
PERF_OUTPUT_DSO | PERF_OUTPUT_PERIOD |
PERF_OUTPUT_ADDR | PERF_OUTPUT_DATA_SRC |
PERF_OUTPUT_WEIGHT | PERF_OUTPUT_PHYS_ADDR |
PERF_OUTPUT_DATA_PAGE_SIZE | PERF_OUTPUT_CODE_PAGE_SIZE,
PERF_OUTPUT_DATA_PAGE_SIZE | PERF_OUTPUT_CODE_PAGE_SIZE |
PERF_OUTPUT_INS_LAT,
.invalid_fields = PERF_OUTPUT_TRACE | PERF_OUTPUT_BPF_OUTPUT,
},
@ -522,6 +525,10 @@ static int evsel__check_attr(struct evsel *evsel, struct perf_session *session)
evsel__check_stype(evsel, PERF_SAMPLE_CODE_PAGE_SIZE, "CODE_PAGE_SIZE", PERF_OUTPUT_CODE_PAGE_SIZE))
return -EINVAL;
if (PRINT_FIELD(INS_LAT) &&
evsel__check_stype(evsel, PERF_SAMPLE_WEIGHT_STRUCT, "WEIGHT_STRUCT", PERF_OUTPUT_INS_LAT))
return -EINVAL;
return 0;
}
@ -2039,6 +2046,9 @@ static void process_event(struct perf_script *script,
if (PRINT_FIELD(WEIGHT))
fprintf(fp, "%16" PRIu64, sample->weight);
if (PRINT_FIELD(INS_LAT))
fprintf(fp, "%16" PRIu16, sample->ins_lat);
if (PRINT_FIELD(IP)) {
struct callchain_cursor *cursor = NULL;
@ -3715,7 +3725,7 @@ int cmd_script(int argc, const char **argv)
"addr,symoff,srcline,period,iregs,uregs,brstack,"
"brstacksym,flags,bpf-output,brstackinsn,brstackoff,"
"callindent,insn,insnlen,synth,phys_addr,metric,misc,ipc,tod,"
"data_page_size,code_page_size",
"data_page_size,code_page_size,ins_lat",
parse_output_fields),
OPT_BOOLEAN('a', "all-cpus", &system_wide,
"system-wide collection from all CPUs"),