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e9a4062e15
Add the option allow the users to set a different buffer size for the trace. For example, in large systems, the user might be interested on reducing the trace buffer to avoid large tracing files. The buffer size is specified in kB, and it is only affecting the tracing instance. The function trace_set_buffer_size() appears on libtracefs v1.6, so increase the minimum required version on Makefile.config. Link: https://lkml.kernel.org/r/e7c9ca5b3865f28e131a49ec3b984fadf2d056c6.1715860611.git.bristot@kernel.org Cc: Jonathan Corbet <corbet@lwn.net> Cc: Juri Lelli <juri.lelli@redhat.com> Cc: John Kacur <jkacur@redhat.com> Signed-off-by: Daniel Bristot de Oliveira <bristot@kernel.org>
52 lines
1.7 KiB
C
52 lines
1.7 KiB
C
// SPDX-License-Identifier: GPL-2.0
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#include <tracefs.h>
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#include <stddef.h>
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struct trace_events {
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struct trace_events *next;
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char *system;
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char *event;
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char *filter;
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char *trigger;
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char enabled;
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char filter_enabled;
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char trigger_enabled;
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};
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struct trace_instance {
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struct tracefs_instance *inst;
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struct tep_handle *tep;
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struct trace_seq *seq;
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};
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int trace_instance_init(struct trace_instance *trace, char *tool_name);
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int trace_instance_start(struct trace_instance *trace);
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void trace_instance_destroy(struct trace_instance *trace);
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struct trace_seq *get_trace_seq(void);
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int enable_tracer_by_name(struct tracefs_instance *inst, const char *tracer_name);
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void disable_tracer(struct tracefs_instance *inst);
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int enable_osnoise(struct trace_instance *trace);
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int enable_timerlat(struct trace_instance *trace);
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struct tracefs_instance *create_instance(char *instance_name);
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void destroy_instance(struct tracefs_instance *inst);
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int save_trace_to_file(struct tracefs_instance *inst, const char *filename);
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int collect_registered_events(struct tep_event *tep, struct tep_record *record,
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int cpu, void *context);
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struct trace_events *trace_event_alloc(const char *event_string);
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void trace_events_disable(struct trace_instance *instance,
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struct trace_events *events);
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void trace_events_destroy(struct trace_instance *instance,
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struct trace_events *events);
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int trace_events_enable(struct trace_instance *instance,
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struct trace_events *events);
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int trace_event_add_filter(struct trace_events *event, char *filter);
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int trace_event_add_trigger(struct trace_events *event, char *trigger);
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int trace_is_off(struct trace_instance *tool, struct trace_instance *trace);
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int trace_set_buffer_size(struct trace_instance *trace, int size);
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