[PATCH v3 3/5] perf tools: Use dynamic register set for Dwarf unwind
From: James Clark <hidden>
Date: 2022-05-25 15:42:09
Also in:
linux-perf-users, lkml
Subsystem:
performance events subsystem, the rest · Maintainers:
Peter Zijlstra, Ingo Molnar, Arnaldo Carvalho de Melo, Namhyung Kim, Linus Torvalds
Architectures can detect availability of extra registers at runtime so use this more complete set for unwinding. This will include the VG register on arm64 in a later commit. If the function isn't implemented then PERF_REGS_MASK is returned and there is no change. Reviewed-by: Leo Yan <redacted> Signed-off-by: James Clark <redacted> --- tools/perf/util/evsel.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/tools/perf/util/evsel.c b/tools/perf/util/evsel.c
index ef169ad15236..020836a4c4bc 100644
--- a/tools/perf/util/evsel.c
+++ b/tools/perf/util/evsel.c@@ -896,7 +896,7 @@ static void __evsel__config_callchain(struct evsel *evsel, struct record_opts *o "specifying a subset with --user-regs may render DWARF unwinding unreliable, " "so the minimal registers set (IP, SP) is explicitly forced.\n"); } else { - attr->sample_regs_user |= PERF_REGS_MASK; + attr->sample_regs_user |= arch__user_reg_mask(); } attr->sample_stack_user = param->dump_size; attr->exclude_callchain_user = 1;
--
2.28.0
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