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Message-ID: <20240726102826.787004-5-howardchu95@gmail.com>
Date: Fri, 26 Jul 2024 18:28:25 +0800
From: Howard Chu <howardchu95@...il.com>
To: namhyung@...nel.org
Cc: irogers@...gle.com,
acme@...nel.org,
adrian.hunter@...el.com,
jolsa@...nel.org,
kan.liang@...ux.intel.com,
linux-perf-users@...r.kernel.org,
linux-kernel@...r.kernel.org
Subject: [PATCH v3 4/5] perf record off-cpu: save embedded sample type
We have to save the embedded sample type for it to be consumed correctly
by perf script or perf report.
This is a bad approach because it most definitely will break some
perf.data convertor. Another approach is to add this sample_type_embed
to perf_event_attr, but changing perf api is above my pay grade, so
please give me your suggestions!
Signed-off-by: Howard Chu <howardchu95@...il.com>
---
tools/perf/util/header.c | 12 ++++++++++++
1 file changed, 12 insertions(+)
diff --git a/tools/perf/util/header.c b/tools/perf/util/header.c
index 55e9553861d0..ccb5493dc515 100644
--- a/tools/perf/util/header.c
+++ b/tools/perf/util/header.c
@@ -80,6 +80,7 @@ const char perf_version_string[] = PERF_VERSION;
struct perf_file_attr {
struct perf_event_attr attr;
+ __u64 embed;
struct perf_file_section ids;
};
@@ -3713,6 +3714,7 @@ static int perf_session__do_write_header(struct perf_session *session,
}
f_attr = (struct perf_file_attr){
.attr = evsel->core.attr,
+ .embed = evsel->sample_type_embed,
.ids = {
.offset = evsel->id_offset,
.size = evsel->core.ids * sizeof(u64),
@@ -4147,6 +4149,14 @@ static int read_attr(int fd, struct perf_header *ph,
ret = readn(fd, ptr, left);
}
+
+ ret = readn(fd, &f_attr->embed, sizeof(f_attr->embed));
+ if (ret <= 0) {
+ pr_debug("cannot read %d bytes of embedded sample type\n",
+ PERF_ATTR_SIZE_VER0);
+ return -1;
+ }
+
/* read perf_file_section, ids are read in caller */
ret = readn(fd, &f_attr->ids, sizeof(f_attr->ids));
@@ -4272,6 +4282,8 @@ int perf_session__read_header(struct perf_session *session, int repipe_fd)
tmp = lseek(fd, 0, SEEK_CUR);
evsel = evsel__new(&f_attr.attr);
+ evsel->sample_type_embed = f_attr.embed;
+
if (evsel == NULL)
goto out_delete_evlist;
--
2.45.2
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