Greg Kroah-Hartman
598cf27219
Link: https://lore.kernel.org/r/20260217200002.683975158@linuxfoundation.org Tested-by: Florian Fainelli <florian.fainelli@broadcom.com> Tested-by: Takeshi Ogasawara <takeshi.ogasawara@futuring-girl.com> Tested-by: Peter Schneider <pschneider1968@googlemail.com> Tested-by: Jon Hunter <jonathanh@nvidia.com> Tested-by: Salvatore Bonaccorso <carnil@debian.org> Tested-by: Brett A C Sheffield <bacs@librecast.net> Tested-by: Mark Brown <broonie@kernel.org> Tested-by: Luna Jernberg <droidbittin@gmail.com> Tested-by: Ronald Warsow <rwarsow@gmx.de> Tested-by: Justin M. Forbes <jforbes@fedoraproject.org> Tested-by: Ron Economos <re@w6rz.net> Tested-by: Miguel Ojeda <ojeda@kernel.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
32 lines
1.1 KiB
C
32 lines
1.1 KiB
C
/* SPDX-License-Identifier: (LGPL-2.1 OR BSD-2-Clause) */
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#ifndef __LIBPERF_BPF_PERF_H
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#define __LIBPERF_BPF_PERF_H
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#include <linux/types.h> /* for __u32 */
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/*
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* bpf_perf uses a hashmap, the attr_map, to track all the leader programs.
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* The hashmap is pinned in bpffs. flock() on this file is used to ensure
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* no concurrent access to the attr_map. The key of attr_map is struct
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* perf_event_attr, and the value is struct perf_event_attr_map_entry.
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*
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* struct perf_event_attr_map_entry contains two __u32 IDs, bpf_link of the
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* leader prog, and the diff_map. Each perf-stat session holds a reference
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* to the bpf_link to make sure the leader prog is attached to sched_switch
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* tracepoint.
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*
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* Since the hashmap only contains IDs of the bpf_link and diff_map, it
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* does not hold any references to the leader program. Once all perf-stat
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* sessions of these events exit, the leader prog, its maps, and the
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* perf_events will be freed.
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*/
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struct perf_event_attr_map_entry {
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__u32 link_id;
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__u32 diff_map_id;
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};
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/* default attr_map name */
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#define BPF_PERF_DEFAULT_ATTR_MAP_PATH "perf_attr_map"
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#endif /* __LIBPERF_BPF_PERF_H */
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