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perf tools: Record ARM64 LR register automatically

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On ARM64, automatically record the link register if the frame pointer
mode is on. It will be used to do a dwarf unwind to find the caller of
the leaf frame if the frame pointer was omitted.

Reviewed-by: James Clark <james.clark@arm.com>
Signed-off-by: Alexandre Truong <alexandre.truong@arm.com>
Acked-by: Jiri Olsa <jolsa@kernel.org>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: John Garry <john.garry@huawei.com>
Cc: Leo Yan <leo.yan@linaro.org>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Mathieu Poirier <mathieu.poirier@linaro.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Will Deacon <will@kernel.org>
Cc: linux-arm-kernel@lists.infradead.org
Link: https://lore.kernel.org/r/20211217154521.80603-2-german.gomez@arm.com
Signed-off-by: German Gomez <german.gomez@arm.com>
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Alexandre Truong 2021-12-17 15:45:15 +00:00 committed by Arnaldo Carvalho de Melo
parent f8464e084d
commit 7248e308a5
3 changed files with 17 additions and 0 deletions
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7
tools/perf/arch/arm64/util/machine.c
View File

@ -5,6 +5,8 @@
#include <string.h>
#include "debug.h"
#include "symbol.h"
#include "callchain.h"
#include "record.h"
/* On arm64, kernel text segment starts at high memory address,
* for example 0xffff 0000 8xxx xxxx. Modules start at a low memory
@ -26,3 +28,8 @@ void arch__symbols__fixup_end(struct symbol *p, struct symbol *c)
p->end = c->start;
pr_debug4("%s sym:%s end:%#" PRIx64 "\n", __func__, p->name, p->end);
}
void arch__add_leaf_frame_record_opts(struct record_opts *opts)
{
opts->sample_user_regs |= sample_reg_masks[PERF_REG_ARM64_LR].mask;
}

8
tools/perf/builtin-record.c
View File

@ -2267,6 +2267,10 @@ out_free:
return ret;
}
void __weak arch__add_leaf_frame_record_opts(struct record_opts *opts __maybe_unused)
{
}
static int parse_control_option(const struct option *opt,
const char *str,
int unset __maybe_unused)
@ -2898,6 +2902,10 @@ int cmd_record(int argc, const char **argv)
}
rec->opts.target.hybrid = perf_pmu__has_hybrid();
if (callchain_param.enabled && callchain_param.record_mode == CALLCHAIN_FP)
arch__add_leaf_frame_record_opts(&rec->opts);
err = -ENOMEM;
if (evlist__create_maps(rec->evlist, &rec->opts.target) < 0)
usage_with_options(record_usage, record_options);

2
tools/perf/util/callchain.h
View File

@ -280,6 +280,8 @@ static inline int arch_skip_callchain_idx(struct thread *thread __maybe_unused,
}
#endif
void arch__add_leaf_frame_record_opts(struct record_opts *opts);
char *callchain_list__sym_name(struct callchain_list *cl,
char *bf, size_t bfsize, bool show_dso);
char *callchain_node__scnprintf_value(struct callchain_node *node,