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Message-ID: <20240815223823.2402285-1-namhyung@kernel.org>
Date: Thu, 15 Aug 2024 15:38:23 -0700
From: Namhyung Kim <namhyung@...nel.org>
To: Arnaldo Carvalho de Melo <acme@...nel.org>
Cc: Ian Rogers <irogers@...gle.com>,
Jiri Olsa <jolsa@...nel.org>,
Adrian Hunter <adrian.hunter@...el.com>,
Peter Zijlstra <peterz@...radead.org>,
Ingo Molnar <mingo@...nel.org>,
LKML <linux-kernel@...r.kernel.org>,
linux-perf-users@...r.kernel.org,
Athira Rajeev <atrajeev@...ux.vnet.ibm.com>
Subject: [PATCH] perf annotate-data: Set bitfield member offset and size properly
The bitfield members might not have DW_AT_data_member_location. Let's
use DW_AT_data_bit_offset to set the member offset correct. Also use
DW_AT_bit_size for the name like in a C program.
Before:
Annotate type: 'struct sk_buff' (1 samples)
Percent Offset Size Field
- 100.00 0 232 struct sk_buff {
+ 0.00 0 24 union ;
+ 0.00 24 8 union ;
+ 0.00 32 8 union ;
0.00 40 48 char[] cb;
+ 0.00 88 16 union ;
0.00 104 8 long unsigned int _nfct;
100.00 112 4 unsigned int len;
0.00 116 4 unsigned int data_len;
0.00 120 2 __u16 mac_len;
0.00 122 2 __u16 hdr_len;
0.00 124 2 __u16 queue_mapping;
0.00 126 0 __u8[] __cloned_offset;
0.00 0 1 __u8 cloned;
0.00 0 1 __u8 nohdr;
0.00 0 1 __u8 fclone;
0.00 0 1 __u8 peeked;
0.00 0 1 __u8 head_frag;
0.00 0 1 __u8 pfmemalloc;
0.00 0 1 __u8 pp_recycle;
0.00 127 1 __u8 active_extensions;
+ 0.00 128 60 union ;
0.00 188 4 sk_buff_data_t tail;
0.00 192 4 sk_buff_data_t end;
0.00 200 8 unsigned char* head;
After:
Annotate type: 'struct sk_buff' (1 samples)
Percent Offset Size Field
- 100.00 0 232 struct sk_buff {
+ 0.00 0 24 union ;
+ 0.00 24 8 union ;
+ 0.00 32 8 union ;
0.00 40 48 char[] cb
+ 0.00 88 16 union ;
0.00 104 8 long unsigned int _nfct;
100.00 112 4 unsigned int len;
0.00 116 4 unsigned int data_len;
0.00 120 2 __u16 mac_len;
0.00 122 2 __u16 hdr_len;
0.00 124 2 __u16 queue_mapping;
0.00 126 0 __u8[] __cloned_offset;
0.00 126 1 __u8 cloned:1;
0.00 126 1 __u8 nohdr:1;
0.00 126 1 __u8 fclone:2;
0.00 126 1 __u8 peeked:1;
0.00 126 1 __u8 head_frag:1;
0.00 126 1 __u8 pfmemalloc:1;
0.00 126 1 __u8 pp_recycle:1;
0.00 127 1 __u8 active_extensions;
+ 0.00 128 60 union ;
0.00 188 4 sk_buff_data_t tail;
0.00 192 4 sk_buff_data_t end;
0.00 200 8 unsigned char* head;
Cc: Athira Rajeev <atrajeev@...ux.vnet.ibm.com>
Signed-off-by: Namhyung Kim <namhyung@...nel.org>
---
tools/perf/util/annotate-data.c | 34 +++++++++++++++++++++++++++------
1 file changed, 28 insertions(+), 6 deletions(-)
diff --git a/tools/perf/util/annotate-data.c b/tools/perf/util/annotate-data.c
index ff85d190e3ac..d9e0ca61b6b5 100644
--- a/tools/perf/util/annotate-data.c
+++ b/tools/perf/util/annotate-data.c
@@ -202,7 +202,7 @@ static int __add_member_cb(Dwarf_Die *die, void *arg)
struct annotated_member *parent = arg;
struct annotated_member *member;
Dwarf_Die member_type, die_mem;
- Dwarf_Word size, loc;
+ Dwarf_Word size, loc, bit_size = 0;
Dwarf_Attribute attr;
struct strbuf sb;
int tag;
@@ -226,15 +226,37 @@ static int __add_member_cb(Dwarf_Die *die, void *arg)
if (dwarf_aggregate_size(&die_mem, &size) < 0)
size = 0;
- if (!dwarf_attr_integrate(die, DW_AT_data_member_location, &attr))
- loc = 0;
- else
+ if (dwarf_attr_integrate(die, DW_AT_data_member_location, &attr))
dwarf_formudata(&attr, &loc);
+ else {
+ /* bitfield member */
+ if (dwarf_attr_integrate(die, DW_AT_data_bit_offset, &attr) &&
+ dwarf_formudata(&attr, &loc) == 0)
+ loc /= 8;
+ else
+ loc = 0;
+
+ if (dwarf_attr_integrate(die, DW_AT_bit_size, &attr) &&
+ dwarf_formudata(&attr, &bit_size) == 0)
+ size = (bit_size + 7) / 8;
+ }
member->type_name = strbuf_detach(&sb, NULL);
/* member->var_name can be NULL */
- if (dwarf_diename(die))
- member->var_name = strdup(dwarf_diename(die));
+ if (dwarf_diename(die)) {
+ if (bit_size) {
+ if (asprintf(&member->var_name, "%s:%ld",
+ dwarf_diename(die), (long)bit_size) < 0)
+ member->var_name = NULL;
+ } else {
+ member->var_name = strdup(dwarf_diename(die));
+ }
+
+ if (member->var_name == NULL) {
+ free(member);
+ return DIE_FIND_CB_END;
+ }
+ }
member->size = size;
member->offset = loc + parent->offset;
INIT_LIST_HEAD(&member->children);
--
2.46.0.184.g6999bdac58-goog
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