55 lines
1.9 KiB
C
55 lines
1.9 KiB
C
/* SPDX-License-Identifier: (LGPL-2.1 OR BSD-2-Clause) */
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#ifndef __TRACE_HELPERS_H
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#define __TRACE_HELPERS_H
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#include <stdbool.h>
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#define NSEC_PER_SEC 1000000000ULL
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void print_log2_hist(unsigned int *vals, int vals_size, const char *val_type);
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void print_linear_hist(unsigned int *vals, int vals_size, unsigned int base,
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unsigned int step, const char *val_type);
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unsigned long long get_ktime_ns(void);
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bool is_kernel_module(const char *name);
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/*
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* When attempting to use kprobe/kretprobe, please check out new fentry/fexit
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* probes, as they provide better performance and usability. But in some
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* situations we have to fallback to kprobe/kretprobe probes. This helper
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* is used to detect fentry/fexit support for the specified kernel function.
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*
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* 1. A gap between kernel versions, kernel BTF is exposed
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* starting from 5.4 kernel. but fentry/fexit is actually
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* supported starting from 5.5.
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* 2. Whether kernel supports module BTF or not
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*
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* *name* is the name of a kernel function to be attached to, which can be
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* from vmlinux or a kernel module.
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* *mod* is a hint that indicates the *name* may reside in module BTF,
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* if NULL, it means *name* belongs to vmlinux.
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*/
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bool fentry_can_attach(const char *name, const char *mod);
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/*
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* The name of a kernel function to be attached to may be changed between
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* kernel releases. This helper is used to confirm whether the target kernel
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* uses a certain function name before attaching.
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*
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* It is achieved by scaning
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* /sys/kernel/debug/tracing/available_filter_functions
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* If this file does not exist, it fallbacks to parse /proc/kallsyms,
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* which is slower.
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*/
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bool kprobe_exists(const char *name);
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bool tracepoint_exists(const char *category, const char *event);
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bool vmlinux_btf_exists(void);
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bool module_btf_exists(const char *mod);
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bool probe_tp_btf(const char *name);
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bool probe_ringbuf();
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#endif /* __TRACE_HELPERS_H */
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