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perf script: Enable to present DTL entries

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The process_event() function in "builtin-script.c" invokes
perf_sample__fprintf_synth() for displaying PERF_TYPE_SYNTH
type events.

   if (attr->type == PERF_TYPE_SYNTH && PRINT_FIELD(SYNTH))
   	perf_sample__fprintf_synth(sample, evsel, fp);

perf_sample__fprintf_synth() process the sample depending on the value
in evsel->core.attr.config. Introduce perf_sample__fprintf_synth_vpadtl()
and invoke this for PERF_SYNTH_POWERPC_VPA_DTL

Sample output:

   ./perf record -a -e sched:*,vpa_dtl/dtl_all/ -c 1000000000 sleep 1
   [ perf record: Woken up 1 times to write data ]
   [ perf record: Captured and wrote 0.300 MB perf.data ]

   ./perf script
            perf   13322 [002]   233.835807:                     sched:sched_switch: perf:13322 [120] R ==> migration/2:27 [0]
     migration/2      27 [002]   233.835811:               sched:sched_migrate_task: comm=perf pid=13322 prio=120 orig_cpu=2 dest_cpu=3
     migration/2      27 [002]   233.835818:               sched:sched_stat_runtime: comm=migration/2 pid=27 runtime=9214 [ns]
     migration/2      27 [002]   233.835819:                     sched:sched_switch: migration/2:27 [0] S ==> swapper/2:0 [120]
         swapper       0 [002]   233.835822:                                vpa-dtl: timebase: 338954486062657 dispatch_reason:decrementer_interrupt, preempt_reason:H_CEDE, enqueue_to_dispatch_time:435,			ready_to_enqueue_time:0, waiting_to_ready_time:34775058, processor_id: 202 c0000000000f8094 plpar_hcall_norets_notrace+0x18 ([kernel.kallsyms])
         swapper       0 [001]   233.835886:                                vpa-dtl: timebase: 338954486095398 dispatch_reason:priv_doorbell, preempt_reason:H_CEDE, enqueue_to_dispatch_time:542,			ready_to_enqueue_time:0, waiting_to_ready_time:1245360, processor_id: 201 c0000000000f8094 plpar_hcall_norets_notrace+0x18 ([kernel.kallsyms])

Reviewed-by: Adrian Hunter <adrian.hunter@intel.com>
Signed-off-by: Athira Rajeev <atrajeev@linux.ibm.com>
Tested-by: Tejas Manhas <tejas05@linux.ibm.com>
Tested-by: Venkat Rao Bagalkote <venkat88@linux.ibm.com>
Cc: Aboorva Devarajan <aboorvad@linux.ibm.com>
Cc: Aditya Bodkhe <Aditya.Bodkhe1@ibm.com>
Cc: Hari Bathini <hbathini@linux.vnet.ibm.com>
Cc: Ian Rogers <irogers@google.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Madhavan Srinivasan <maddy@linux.ibm.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Shrikanth Hegde <sshegde@linux.ibm.com>
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Athira Rajeev 2025-09-16 10:55:36 +05:30 committed by Arnaldo Carvalho de Melo
parent 8644834a48
commit a0dfb18f7d
2 changed files with 33 additions and 0 deletions
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30
tools/perf/builtin-script.c
View File

@ -43,6 +43,7 @@
#include <linux/stringify.h>
#include <linux/time64.h>
#include <linux/zalloc.h>
#include <linux/unaligned.h>
#include <sys/utsname.h>
#include "asm/bug.h"
#include "util/mem-events.h"
@ -2003,6 +2004,33 @@ static int perf_sample__fprintf_synth_iflag_chg(struct perf_sample *sample, FILE
return len + perf_sample__fprintf_pt_spacing(len, fp);
}
#ifdef HAVE_AUXTRACE_SUPPORT
static int perf_sample__fprintf_synth_vpadtl(struct perf_sample *data, FILE *fp)
{
struct powerpc_vpadtl_entry *dtl = (struct powerpc_vpadtl_entry *)data->raw_data;
int len;
len = fprintf(fp, "timebase: %" PRIu64 " dispatch_reason:%s, preempt_reason:%s,\n"
"enqueue_to_dispatch_time:%d, ready_to_enqueue_time:%d,"
"waiting_to_ready_time:%d, processor_id: %d",
get_unaligned_be64(&dtl->timebase),
dispatch_reasons[dtl->dispatch_reason],
preempt_reasons[dtl->preempt_reason],
be32_to_cpu(dtl->enqueue_to_dispatch_time),
be32_to_cpu(dtl->ready_to_enqueue_time),
be32_to_cpu(dtl->waiting_to_ready_time),
be16_to_cpu(dtl->processor_id));
return len;
}
#else
static int perf_sample__fprintf_synth_vpadtl(struct perf_sample *data __maybe_unused,
FILE *fp __maybe_unused)
{
return 0;
}
#endif
static int perf_sample__fprintf_synth(struct perf_sample *sample,
struct evsel *evsel, FILE *fp)
{
@ -2025,6 +2053,8 @@ static int perf_sample__fprintf_synth(struct perf_sample *sample,
return perf_sample__fprintf_synth_evt(sample, fp);
case PERF_SYNTH_INTEL_IFLAG_CHG:
return perf_sample__fprintf_synth_iflag_chg(sample, fp);
case PERF_SYNTH_POWERPC_VPA_DTL:
return perf_sample__fprintf_synth_vpadtl(sample, fp);
default:
break;
}

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

@ -271,6 +271,9 @@ struct powerpc_vpadtl_entry {
u64 srr1;
};
extern const char *dispatch_reasons[11];
extern const char *preempt_reasons[10];
static inline void *perf_synth__raw_data(void *p)
{
return p + 4;