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71d078803c
Add tracing support to track sched_ext core events
(/sched_ext/sched_ext_event). This may be useful for debugging sched_ext
schedulers that trigger a particular event.
The trace point can be used as other trace points, so it can be used in,
for example, `perf trace` and BPF programs, as follows:
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$> sudo perf trace -e sched_ext:sched_ext_event --filter 'name == "SCX_EV_ENQ_SLICE_DFL"'
======
======
struct tp_sched_ext_event {
struct trace_entry ent;
u32 __data_loc_name;
s64 delta;
};
SEC("tracepoint/sched_ext/sched_ext_event")
int rtp_add_event(struct tp_sched_ext_event *ctx)
{
char event_name[128];
unsigned short offset = ctx->__data_loc_name & 0xFFFF;
bpf_probe_read_str((void *)event_name, 128, (char *)ctx + offset);
bpf_printk("name %s delta %lld", event_name, ctx->delta);
return 0;
}
======
Signed-off-by: Changwoo Min <changwoo@igalia.com>
Acked-by: Andrea Righi <arighi@nvidia.com>
Signed-off-by: Tejun Heo <tj@kernel.org>
51 lines
861 B
C
51 lines
861 B
C
/* SPDX-License-Identifier: GPL-2.0 */
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#undef TRACE_SYSTEM
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#define TRACE_SYSTEM sched_ext
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#if !defined(_TRACE_SCHED_EXT_H) || defined(TRACE_HEADER_MULTI_READ)
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#define _TRACE_SCHED_EXT_H
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#include <linux/tracepoint.h>
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TRACE_EVENT(sched_ext_dump,
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TP_PROTO(const char *line),
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TP_ARGS(line),
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TP_STRUCT__entry(
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__string(line, line)
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),
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TP_fast_assign(
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__assign_str(line);
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),
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TP_printk("%s",
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__get_str(line)
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)
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);
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TRACE_EVENT(sched_ext_event,
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TP_PROTO(const char *name, __s64 delta),
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TP_ARGS(name, delta),
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TP_STRUCT__entry(
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__string(name, name)
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__field( __s64, delta )
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),
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TP_fast_assign(
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__assign_str(name);
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__entry->delta = delta;
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),
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TP_printk("name %s delta %lld",
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__get_str(name), __entry->delta
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)
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);
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#endif /* _TRACE_SCHED_EXT_H */
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/* This part must be outside protection */
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#include <trace/define_trace.h>
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