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perf tools: Record ARM64 LR register automatically
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>
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3 changed files with 17 additions and 0 deletions
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@ -5,6 +5,8 @@
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#include <string.h>
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#include <string.h>
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#include "debug.h"
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#include "debug.h"
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#include "symbol.h"
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#include "symbol.h"
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#include "callchain.h"
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#include "record.h"
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/* On arm64, kernel text segment starts at high memory address,
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/* On arm64, kernel text segment starts at high memory address,
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* for example 0xffff 0000 8xxx xxxx. Modules start at a low memory
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* for example 0xffff 0000 8xxx xxxx. Modules start at a low memory
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@ -26,3 +28,8 @@ void arch__symbols__fixup_end(struct symbol *p, struct symbol *c)
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p->end = c->start;
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p->end = c->start;
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pr_debug4("%s sym:%s end:%#" PRIx64 "\n", __func__, p->name, p->end);
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pr_debug4("%s sym:%s end:%#" PRIx64 "\n", __func__, p->name, p->end);
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}
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}
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void arch__add_leaf_frame_record_opts(struct record_opts *opts)
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{
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opts->sample_user_regs |= sample_reg_masks[PERF_REG_ARM64_LR].mask;
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}
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@ -2267,6 +2267,10 @@ static int record__parse_mmap_pages(const struct option *opt,
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return ret;
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return ret;
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}
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}
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void __weak arch__add_leaf_frame_record_opts(struct record_opts *opts __maybe_unused)
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{
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}
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static int parse_control_option(const struct option *opt,
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static int parse_control_option(const struct option *opt,
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const char *str,
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const char *str,
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int unset __maybe_unused)
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int unset __maybe_unused)
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@ -2898,6 +2902,10 @@ int cmd_record(int argc, const char **argv)
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}
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}
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rec->opts.target.hybrid = perf_pmu__has_hybrid();
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rec->opts.target.hybrid = perf_pmu__has_hybrid();
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if (callchain_param.enabled && callchain_param.record_mode == CALLCHAIN_FP)
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arch__add_leaf_frame_record_opts(&rec->opts);
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err = -ENOMEM;
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err = -ENOMEM;
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if (evlist__create_maps(rec->evlist, &rec->opts.target) < 0)
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if (evlist__create_maps(rec->evlist, &rec->opts.target) < 0)
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usage_with_options(record_usage, record_options);
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usage_with_options(record_usage, record_options);
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@ -280,6 +280,8 @@ static inline int arch_skip_callchain_idx(struct thread *thread __maybe_unused,
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}
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}
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#endif
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#endif
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void arch__add_leaf_frame_record_opts(struct record_opts *opts);
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char *callchain_list__sym_name(struct callchain_list *cl,
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char *callchain_list__sym_name(struct callchain_list *cl,
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char *bf, size_t bfsize, bool show_dso);
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char *bf, size_t bfsize, bool show_dso);
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char *callchain_node__scnprintf_value(struct callchain_node *node,
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char *callchain_node__scnprintf_value(struct callchain_node *node,
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