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![Jiri Olsa](/assets/img/avatar_default.png)
Caching registers value into an array. Got about 4% speed up of perf_reg_value function for report command processing dwarf unwind stacks. Output from report over 1.5 GB data with DWARF unwind stacks: (TODO fix perf diff) current code: 5.84% perf perf [.] perf_reg_value change: 1.94% perf perf [.] perf_reg_value And little bit of overall speed up: (perf stat -r 5 -e '{cycles,instructions}:u' ...) current code: 310,298,611,754 cycles ( +- 0.33% ) 439,669,689,341 instructions ( +- 0.03% ) 188.656753166 seconds time elapsed ( +- 0.82% ) change: 291,315,329,878 cycles ( +- 0.22% ) 391,763,485,304 instructions ( +- 0.03% ) 180.742249687 seconds time elapsed ( +- 0.64% ) Acked-by: Namhyung Kim <namhyung@kernel.org> Cc: Arnaldo Carvalho de Melo <acme@kernel.org> Cc: Corey Ashford <cjashfor@linux.vnet.ibm.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: Namhyung Kim <namhyung@kernel.org> Cc: Paul Mackerras <paulus@samba.org> Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Link: http://lkml.kernel.org/r/1401892622-30848-2-git-send-email-jolsa@kernel.org Signed-off-by: Jiri Olsa <jolsa@kernel.org>
29 lines
555 B
C
29 lines
555 B
C
#ifndef __PERF_REGS_H
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#define __PERF_REGS_H
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#include <linux/types.h>
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struct regs_dump;
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#ifdef HAVE_PERF_REGS_SUPPORT
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#include <perf_regs.h>
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int perf_reg_value(u64 *valp, struct regs_dump *regs, int id);
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#else
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#define PERF_REGS_MASK 0
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#define PERF_REGS_MAX 0
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static inline const char *perf_reg_name(int id __maybe_unused)
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{
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return NULL;
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}
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static inline int perf_reg_value(u64 *valp __maybe_unused,
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struct regs_dump *regs __maybe_unused,
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int id __maybe_unused)
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{
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return 0;
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}
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#endif /* HAVE_PERF_REGS_SUPPORT */
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#endif /* __PERF_REGS_H */
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