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perf annotate-data: Track instructions with a this-cpu variable

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Like global variables, this per-cpu variables should be tracked
correctly.  Factor our get_global_var_type() to handle both global
and per-cpu (for this cpu) variables in the same manner.

Signed-off-by: Namhyung Kim <namhyung@kernel.org>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Ian Rogers <irogers@google.com>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Masami Hiramatsu <mhiramat@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Stephane Eranian <eranian@google.com>
Link: https://lore.kernel.org/r/20240319055115.4063940-19-namhyung@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Namhyung Kim 2024-03-18 22:51:10 -07:00 committed by Arnaldo Carvalho de Melo
parent 02e17ca917
commit ad62edbfc5
1 changed files with 30 additions and 1 deletions
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31
tools/perf/util/annotate-data.c
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@ -553,12 +553,41 @@ static void update_insn_state_x86(struct type_state *state,
fbreg = -1;
}
/* Case 1. register to register transfers */
/* Case 1. register to register or segment:offset to register transfers */
if (!src->mem_ref && !dst->mem_ref) {
if (!has_reg_type(state, dst->reg1))
return;
tsr = &state->regs[dst->reg1];
if (map__dso(dloc->ms->map)->kernel &&
src->segment == INSN_SEG_X86_GS && src->imm) {
u64 ip = dloc->ms->sym->start + dl->al.offset;
u64 var_addr;
int offset;
/*
* In kernel, %gs points to a per-cpu region for the
* current CPU. Access with a constant offset should
* be treated as a global variable access.
*/
var_addr = src->offset;
if (!get_global_var_type(cu_die, dloc, ip, var_addr,
&offset, &type_die) ||
!die_get_member_type(&type_die, offset, &type_die)) {
tsr->ok = false;
return;
}
tsr->type = type_die;
tsr->ok = true;
pr_debug_dtp("mov [%x] this-cpu addr=%#"PRIx64" -> reg%d",
insn_offset, var_addr, dst->reg1);
pr_debug_type_name(&tsr->type);
return;
}
if (!has_reg_type(state, src->reg1) ||
!state->regs[src->reg1].ok) {
tsr->ok = false;