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authorNamhyung Kim <namhyung@kernel.org>2024-01-16 22:26:50 -0800
committerNamhyung Kim <namhyung@kernel.org>2024-01-22 12:08:19 -0800
commit1cf4df0373eed561f543a9e0e0ac2498384d67a0 (patch)
treead6cba939dc844e4af8e3d54c019612b54e0060b /tools/perf/util/annotate.c
parenta3397d69e4e7a1ea37af413ccbdf52dec208ce11 (diff)
perf annotate-data: Handle macro fusion on x86
When a sample was come from a conditional branch without a memory operand, it could be due to a macro fusion with a previous instruction. So it needs to check the memory operand in the previous one. This improves the stat like below: Annotate data type stats: total 294, ok 147 (50.0%), bad 147 (50.0%) ----------------------------------------------------------- 30 : no_sym 32 : no_mem_ops 71 : no_var 6 : no_typeinfo 8 : bad_offset Reviewed-by: Ian Rogers <irogers@google.com> Cc: Stephane Eranian <eranian@google.com> Cc: Masami Hiramatsu <mhiramat@kernel.org> Link: https://lore.kernel.org/r/20240117062657.985479-3-namhyung@kernel.org Signed-off-by: Namhyung Kim <namhyung@kernel.org>
Diffstat (limited to 'tools/perf/util/annotate.c')
-rw-r--r--tools/perf/util/annotate.c17
1 files changed, 16 insertions, 1 deletions
diff --git a/tools/perf/util/annotate.c b/tools/perf/util/annotate.c
index 8d761be1a102..0ec42e85ca5c 100644
--- a/tools/perf/util/annotate.c
+++ b/tools/perf/util/annotate.c
@@ -3751,6 +3751,7 @@ struct annotated_data_type *hist_entry__get_data_type(struct hist_entry *he)
return NULL;
}
+retry:
istat = annotate_data_stat(&ann_insn_stat, dl->ins.name);
if (istat == NULL) {
ann_data_stat.no_insn++;
@@ -3767,7 +3768,7 @@ struct annotated_data_type *hist_entry__get_data_type(struct hist_entry *he)
if (!op_loc->mem_ref)
continue;
- /* Recalculate IP since it can be changed due to LOCK prefix */
+ /* Recalculate IP because of LOCK prefix or insn fusion */
ip = ms->sym->start + dl->al.offset;
mem_type = find_data_type(ms, ip, op_loc->reg, op_loc->offset);
@@ -3786,6 +3787,20 @@ struct annotated_data_type *hist_entry__get_data_type(struct hist_entry *he)
return mem_type;
}
+ /*
+ * Some instructions can be fused and the actual memory access came
+ * from the previous instruction.
+ */
+ if (dl->al.offset > 0) {
+ struct disasm_line *prev_dl;
+
+ prev_dl = list_prev_entry(dl, al.node);
+ if (ins__is_fused(arch, prev_dl->ins.name, dl->ins.name)) {
+ dl = prev_dl;
+ goto retry;
+ }
+ }
+
ann_data_stat.no_mem_ops++;
istat->bad++;
return NULL;