Messages in this thread Patch in this message | | | From | James Clark <> | Subject | [PATCH v2 2/4] perf tools: Use dynamic register set for Dwarf unwind | Date | Tue, 17 May 2022 11:20:03 +0100 |
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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.
Signed-off-by: James Clark <james.clark@arm.com> --- 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 5fd7924f8eb3..787bbcbcd2ae 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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