380b5143ab
The libunwind provides two caching policy which are global and per-thread. As perf unwinds callchains in a single thread, it'd sufficient to use global caching. This speeds up my perf report from 14s to 7s on a ~260MB data file. Although the output sometimes contains a slight difference (~0.01% in terms of number of lines printed) on callchains which were not resolved. Signed-off-by: Namhyung Kim <namhyung@kernel.org> Acked-by: Jean Pihet <jean.pihet@linaro.org> Cc: Arun Sharma <asharma@fb.com> Cc: David Ahern <dsahern@gmail.com> Cc: Frederic Weisbecker <fweisbec@gmail.com> Cc: Ingo Molnar <mingo@kernel.org> Cc: Jean Pihet <jean.pihet@linaro.org> Cc: Jiri Olsa <jolsa@redhat.com> Cc: Namhyung Kim <namhyung.kim@lge.com> Cc: Paul Mackerras <paulus@samba.org> Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Link: http://lkml.kernel.org/r/1412556363-26229-4-git-send-email-namhyung@kernel.org Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
58 lines
1.6 KiB
C
58 lines
1.6 KiB
C
#ifndef __UNWIND_H
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#define __UNWIND_H
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#include <linux/types.h>
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#include "event.h"
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#include "symbol.h"
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#include "thread.h"
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struct unwind_entry {
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struct map *map;
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struct symbol *sym;
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u64 ip;
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};
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typedef int (*unwind_entry_cb_t)(struct unwind_entry *entry, void *arg);
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#ifdef HAVE_DWARF_UNWIND_SUPPORT
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int unwind__get_entries(unwind_entry_cb_t cb, void *arg,
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struct machine *machine,
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struct thread *thread,
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struct perf_sample *data, int max_stack);
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/* libunwind specific */
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#ifdef HAVE_LIBUNWIND_SUPPORT
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int libunwind__arch_reg_id(int regnum);
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int unwind__prepare_access(struct thread *thread);
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void unwind__flush_access(struct thread *thread);
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void unwind__finish_access(struct thread *thread);
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#else
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static inline int unwind__prepare_access(struct thread *thread __maybe_unused)
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{
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return 0;
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}
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static inline void unwind__flush_access(struct thread *thread __maybe_unused) {}
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static inline void unwind__finish_access(struct thread *thread __maybe_unused) {}
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#endif
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#else
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static inline int
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unwind__get_entries(unwind_entry_cb_t cb __maybe_unused,
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void *arg __maybe_unused,
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struct machine *machine __maybe_unused,
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struct thread *thread __maybe_unused,
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struct perf_sample *data __maybe_unused,
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int max_stack __maybe_unused)
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{
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return 0;
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}
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static inline int unwind__prepare_access(struct thread *thread __maybe_unused)
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{
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return 0;
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}
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static inline void unwind__flush_access(struct thread *thread __maybe_unused) {}
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static inline void unwind__finish_access(struct thread *thread __maybe_unused) {}
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#endif /* HAVE_DWARF_UNWIND_SUPPORT */
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#endif /* __UNWIND_H */
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