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b4c658d4d6
Gathering threads with a uid by scanning /proc is inherently racy leading to perf_event_open failures that quit perf. All users of the functionality now use BPF filters, so remove uid and uid_str from target. Signed-off-by: Ian Rogers <irogers@google.com> Link: https://lore.kernel.org/r/20250604174545.2853620-10-irogers@google.com Signed-off-by: Namhyung Kim <namhyung@kernel.org>
98 lines
2.4 KiB
C
98 lines
2.4 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _PERF_TARGET_H
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#define _PERF_TARGET_H
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#include <stdbool.h>
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#include <sys/types.h>
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struct target {
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const char *pid;
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const char *tid;
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const char *cpu_list;
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const char *bpf_str;
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bool system_wide;
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bool uses_mmap;
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bool default_per_cpu;
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bool per_thread;
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bool use_bpf;
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bool inherit;
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int initial_delay;
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const char *attr_map;
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};
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enum target_errno {
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TARGET_ERRNO__SUCCESS = 0,
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/*
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* Choose an arbitrary negative big number not to clash with standard
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* errno since SUS requires the errno has distinct positive values.
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* See 'Issue 6' in the link below.
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*
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* http://pubs.opengroup.org/onlinepubs/9699919799/basedefs/errno.h.html
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*/
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__TARGET_ERRNO__START = -10000,
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/* for target__validate() */
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TARGET_ERRNO__PID_OVERRIDE_CPU = __TARGET_ERRNO__START,
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TARGET_ERRNO__PID_OVERRIDE_SYSTEM,
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TARGET_ERRNO__SYSTEM_OVERRIDE_THREAD,
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TARGET_ERRNO__BPF_OVERRIDE_CPU,
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TARGET_ERRNO__BPF_OVERRIDE_PID,
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TARGET_ERRNO__BPF_OVERRIDE_THREAD,
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__TARGET_ERRNO__END,
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};
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enum target_errno target__validate(struct target *target);
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uid_t parse_uid(const char *str);
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int target__strerror(struct target *target, int errnum, char *buf, size_t buflen);
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static inline bool target__has_task(struct target *target)
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{
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return target->tid || target->pid;
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}
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static inline bool target__has_cpu(struct target *target)
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{
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return target->system_wide || target->cpu_list;
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}
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static inline bool target__none(struct target *target)
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{
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return !target__has_task(target) && !target__has_cpu(target);
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}
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static inline bool target__enable_on_exec(struct target *target)
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{
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/*
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* Normally enable_on_exec should be set if:
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* 1) The tracee process is forked (not attaching to existed task or cpu).
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* 2) And initial_delay is not configured.
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* Otherwise, we enable tracee events manually.
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*/
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return target__none(target) && !target->initial_delay;
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}
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static inline bool target__has_per_thread(struct target *target)
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{
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return target->system_wide && target->per_thread;
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}
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static inline bool target__uses_dummy_map(struct target *target)
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{
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bool use_dummy = false;
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if (target->default_per_cpu)
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use_dummy = target->per_thread ? true : false;
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else if (target__has_task(target) ||
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(!target__has_cpu(target) && !target->uses_mmap))
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use_dummy = true;
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else if (target__has_per_thread(target))
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use_dummy = true;
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return use_dummy;
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}
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#endif /* _PERF_TARGET_H */
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