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3b78670e3a
Currently, rtla-timerlat BPF program uses a global variable stored in a .bss section to store whether tracing has been stopped. Move the information to a separate map, so that it is easily writable from userspace, and add a function that clears the value, resuming tracing after it has been stopped. Cc: John Kacur <jkacur@redhat.com> Cc: Luis Goncalves <lgoncalv@redhat.com> Cc: Arnaldo Carvalho de Melo <acme@kernel.org> Cc: Chang Yin <cyin@redhat.com> Cc: Costa Shulyupin <costa.shul@redhat.com> Cc: Crystal Wood <crwood@redhat.com> Cc: Gabriele Monaco <gmonaco@redhat.com> Link: https://lore.kernel.org/20250626123405.1496931-4-tglozar@redhat.com Signed-off-by: Tomas Glozar <tglozar@redhat.com> Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>
63 lines
1.7 KiB
C
63 lines
1.7 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#pragma once
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enum summary_field {
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SUMMARY_CURRENT,
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SUMMARY_MIN,
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SUMMARY_MAX,
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SUMMARY_COUNT,
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SUMMARY_SUM,
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SUMMARY_OVERFLOW,
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SUMMARY_FIELD_N
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};
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#ifndef __bpf__
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#ifdef HAVE_BPF_SKEL
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int timerlat_bpf_init(struct timerlat_params *params);
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int timerlat_bpf_attach(void);
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void timerlat_bpf_detach(void);
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void timerlat_bpf_destroy(void);
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int timerlat_bpf_wait(int timeout);
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int timerlat_bpf_restart_tracing(void);
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int timerlat_bpf_get_hist_value(int key,
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long long *value_irq,
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long long *value_thread,
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long long *value_user,
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int cpus);
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int timerlat_bpf_get_summary_value(enum summary_field key,
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long long *value_irq,
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long long *value_thread,
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long long *value_user,
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int cpus);
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static inline int have_libbpf_support(void) { return 1; }
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#else
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static inline int timerlat_bpf_init(struct timerlat_params *params)
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{
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return -1;
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}
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static inline int timerlat_bpf_attach(void) { return -1; }
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static inline void timerlat_bpf_detach(void) { };
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static inline void timerlat_bpf_destroy(void) { };
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static inline int timerlat_bpf_wait(int timeout) { return -1; }
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static inline int timerlat_bpf_restart_tracing(void) { return -1; };
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static inline int timerlat_bpf_get_hist_value(int key,
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long long *value_irq,
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long long *value_thread,
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long long *value_user,
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int cpus)
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{
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return -1;
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}
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static inline int timerlat_bpf_get_summary_value(enum summary_field key,
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long long *value_irq,
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long long *value_thread,
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long long *value_user,
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int cpus)
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{
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return -1;
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}
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static inline int have_libbpf_support(void) { return 0; }
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#endif /* HAVE_BPF_SKEL */
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#endif /* __bpf__ */
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