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| author | Changwoo Min <changwoo@igalia.com> | 2025-03-04 19:49:00 +0900 |
|---|---|---|
| committer | Tejun Heo <tj@kernel.org> | 2025-03-04 08:06:17 -1000 |
| commit | 71d078803ccbc020ae3b640293a40a86691b9151 (patch) | |
| tree | 98f77dfb263184863f2a5d7d2d775942ab41e1eb | |
| parent | 038730dc12cb1fa016a95978286a767e8a8b521e (diff) | |
| download | linux-stable-71d078803ccbc020ae3b640293a40a86691b9151.tar.gz linux-stable-71d078803ccbc020ae3b640293a40a86691b9151.tar.bz2 linux-stable-71d078803ccbc020ae3b640293a40a86691b9151.zip | |
sched_ext: Add trace point to track sched_ext core events
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:
======
$> 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>
| -rw-r--r-- | include/trace/events/sched_ext.h | 19 | ||||
| -rw-r--r-- | kernel/sched/ext.c | 2 |
2 files changed, 21 insertions, 0 deletions
diff --git a/include/trace/events/sched_ext.h b/include/trace/events/sched_ext.h index fe19da7315a9..50e4b712735a 100644 --- a/include/trace/events/sched_ext.h +++ b/include/trace/events/sched_ext.h @@ -26,6 +26,25 @@ TRACE_EVENT(sched_ext_dump, ) ); +TRACE_EVENT(sched_ext_event, + TP_PROTO(const char *name, __s64 delta), + TP_ARGS(name, delta), + + TP_STRUCT__entry( + __string(name, name) + __field( __s64, delta ) + ), + + TP_fast_assign( + __assign_str(name); + __entry->delta = delta; + ), + + TP_printk("name %s delta %lld", + __get_str(name), __entry->delta + ) +); + #endif /* _TRACE_SCHED_EXT_H */ /* This part must be outside protection */ diff --git a/kernel/sched/ext.c b/kernel/sched/ext.c index 686629a860f3..debcd1cf2de9 100644 --- a/kernel/sched/ext.c +++ b/kernel/sched/ext.c @@ -1554,6 +1554,7 @@ static DEFINE_PER_CPU(struct scx_event_stats, event_stats_cpu); */ #define scx_add_event(name, cnt) do { \ this_cpu_add(event_stats_cpu.name, cnt); \ + trace_sched_ext_event(#name, cnt); \ } while(0) /** @@ -1565,6 +1566,7 @@ static DEFINE_PER_CPU(struct scx_event_stats, event_stats_cpu); */ #define __scx_add_event(name, cnt) do { \ __this_cpu_add(event_stats_cpu.name, cnt); \ + trace_sched_ext_event(#name, cnt); \ } while(0) /** |