mirror of
git://git.kernel.org/pub/scm/linux/kernel/git/xiang/erofs.git
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Stephane Eranian
7094349078
This patch links perf with the libpfm4 library if it is available and LIBPFM4 is passed to the build. The libpfm4 library contains hardware event tables for all processors supported by perf_events. It is a helper library that helps convert from a symbolic event name to the event encoding required by the underlying kernel interface. This library is open-source and available from: http://perfmon2.sf.net. With this patch, it is possible to specify full hardware events by name. Hardware filters are also supported. Events must be specified via the --pfm-events and not -e option. Both options are active at the same time and it is possible to mix and match: $ perf stat --pfm-events inst_retired:any_p:c=1:i -e cycles .... One needs to explicitely ask for its inclusion by using the LIBPFM4 make command line option, ie its opt-in rather than opt-out of feature detection and build support. Signed-off-by: Stephane Eranian <[email protected]> Reviewed-by: Ian Rogers <[email protected]> Cc: Adrian Hunter <[email protected]> Cc: Alexander Shishkin <[email protected]> Cc: Alexei Starovoitov <[email protected]> Cc: Alexey Budankov <[email protected]> Cc: Andi Kleen <[email protected]> Cc: Andrii Nakryiko <[email protected]> Cc: Daniel Borkmann <[email protected]> Cc: Florian Fainelli <[email protected]> Cc: Greg Kroah-Hartman <[email protected]> Cc: Igor Lubashev <[email protected]> Cc: Jin Yao <[email protected]> Cc: Jiri Olsa <[email protected]> Cc: Jiwei Sun <[email protected]> Cc: John Garry <[email protected]> Cc: Kan Liang <[email protected]> Cc: Leo Yan <[email protected]> Cc: Mark Rutland <[email protected]> Cc: Martin KaFai Lau <[email protected]> Cc: Namhyung Kim <[email protected]> Cc: Peter Zijlstra <[email protected]> Cc: Thomas Gleixner <[email protected]> Cc: Yonghong Song <[email protected]> Cc: [email protected] Cc: [email protected] Cc: yuzhoujian <[email protected]> Link: http://lore.kernel.org/lkml/[email protected] Signed-off-by: Arnaldo Carvalho de Melo <[email protected]>
38 lines
715 B
C
38 lines
715 B
C
/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* Support for libpfm4 event encoding.
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*
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* Copyright 2020 Google LLC.
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*/
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#ifndef __PERF_PFM_H
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#define __PERF_PFM_H
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#include <subcmd/parse-options.h>
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#ifdef HAVE_LIBPFM
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int parse_libpfm_events_option(const struct option *opt, const char *str,
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int unset);
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void print_libpfm_events(bool name_only, bool long_desc);
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#else
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#include <linux/compiler.h>
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static inline int parse_libpfm_events_option(
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const struct option *opt __maybe_unused,
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const char *str __maybe_unused,
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int unset __maybe_unused)
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{
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return 0;
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}
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static inline void print_libpfm_events(bool name_only __maybe_unused,
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bool long_desc __maybe_unused)
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{
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}
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#endif
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#endif /* __PERF_PFM_H */
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