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Date: Tue, 20 Jun 2023 15:55:14 +0000
From: Yang Jihong <yangjihong1@...wei.com>
To: <peterz@...radead.org>, <mingo@...hat.com>, <acme@...nel.org>,
<mark.rutland@....com>, <alexander.shishkin@...ux.intel.com>,
<jolsa@...nel.org>, <namhyung@...nel.org>, <irogers@...gle.com>,
<adrian.hunter@...el.com>, <linux-perf-users@...r.kernel.org>,
<linux-kernel@...r.kernel.org>
CC: <yangjihong1@...wei.com>
Subject: [PATCH 1/2] perf/core: perf_iterate_sb_cpu() supports to receive side-band events for all oneline cpus
Add a bool parameter `system_wide` to perf_iterate_sb_cpu() to output
side-band events to events on all online cpus.
No functional change.
Signed-off-by: Yang Jihong <yangjihong1@...wei.com>
---
kernel/events/core.c | 58 +++++++++++++++++++++++++++++++-------------
1 file changed, 41 insertions(+), 17 deletions(-)
diff --git a/kernel/events/core.c b/kernel/events/core.c
index db016e418931..66dbca1ba577 100644
--- a/kernel/events/core.c
+++ b/kernel/events/core.c
@@ -7886,9 +7886,9 @@ perf_iterate_ctx(struct perf_event_context *ctx,
}
}
-static void perf_iterate_sb_cpu(perf_iterate_f output, void *data)
+static void perf_iterate_sb_pel(perf_iterate_f output, void *data,
+ struct pmu_event_list *pel, bool system_wide)
{
- struct pmu_event_list *pel = this_cpu_ptr(&pmu_sb_events);
struct perf_event *event;
list_for_each_entry_rcu(event, &pel->list, sb_list) {
@@ -7902,12 +7902,30 @@ static void perf_iterate_sb_cpu(perf_iterate_f output, void *data)
if (event->state < PERF_EVENT_STATE_INACTIVE)
continue;
- if (!event_filter_match(event))
+ if (!system_wide && !event_filter_match(event))
continue;
output(event, data);
}
}
+static void perf_iterate_sb_cpu(perf_iterate_f output, void *data,
+ bool system_wide)
+{
+ unsigned int i;
+
+ if (system_wide) {
+ for_each_online_cpu(i) {
+ perf_iterate_sb_pel(output, data,
+ per_cpu_ptr(&pmu_sb_events, i),
+ system_wide);
+ }
+ } else {
+ perf_iterate_sb_pel(output, data,
+ this_cpu_ptr(&pmu_sb_events),
+ system_wide);
+ }
+}
+
/*
* Iterate all events that need to receive side-band events.
*
@@ -7916,7 +7934,8 @@ static void perf_iterate_sb_cpu(perf_iterate_f output, void *data)
*/
static void
perf_iterate_sb(perf_iterate_f output, void *data,
- struct perf_event_context *task_ctx)
+ struct perf_event_context *task_ctx,
+ bool system_wide)
{
struct perf_event_context *ctx;
@@ -7933,7 +7952,7 @@ perf_iterate_sb(perf_iterate_f output, void *data,
goto done;
}
- perf_iterate_sb_cpu(output, data);
+ perf_iterate_sb_cpu(output, data, system_wide);
ctx = rcu_dereference(current->perf_event_ctxp);
if (ctx)
@@ -8174,8 +8193,9 @@ static void perf_event_task(struct task_struct *task,
};
perf_iterate_sb(perf_event_task_output,
- &task_event,
- task_ctx);
+ &task_event,
+ task_ctx,
+ false);
}
void perf_event_fork(struct task_struct *task)
@@ -8254,8 +8274,9 @@ static void perf_event_comm_event(struct perf_comm_event *comm_event)
comm_event->event_id.header.size = sizeof(comm_event->event_id) + size;
perf_iterate_sb(perf_event_comm_output,
- comm_event,
- NULL);
+ comm_event,
+ NULL,
+ false);
}
void perf_event_comm(struct task_struct *task, bool exec)
@@ -8410,7 +8431,8 @@ void perf_event_namespaces(struct task_struct *task)
perf_iterate_sb(perf_event_namespaces_output,
&namespaces_event,
- NULL);
+ NULL,
+ false);
}
/*
@@ -8505,7 +8527,8 @@ static void perf_event_cgroup(struct cgroup *cgrp)
perf_iterate_sb(perf_event_cgroup_output,
&cgroup_event,
- NULL);
+ NULL,
+ false);
kfree(pathname);
}
@@ -8730,8 +8753,9 @@ static void perf_event_mmap_event(struct perf_mmap_event *mmap_event)
build_id_parse(vma, mmap_event->build_id, &mmap_event->build_id_size);
perf_iterate_sb(perf_event_mmap_output,
- mmap_event,
- NULL);
+ mmap_event,
+ NULL,
+ false);
kfree(buf);
}
@@ -9020,7 +9044,7 @@ static void perf_event_switch(struct task_struct *task,
PERF_RECORD_MISC_SWITCH_OUT_PREEMPT;
}
- perf_iterate_sb(perf_event_switch_output, &switch_event, NULL);
+ perf_iterate_sb(perf_event_switch_output, &switch_event, NULL, false);
}
/*
@@ -9149,7 +9173,7 @@ void perf_event_ksymbol(u16 ksym_type, u64 addr, u32 len, bool unregister,
},
};
- perf_iterate_sb(perf_event_ksymbol_output, &ksymbol_event, NULL);
+ perf_iterate_sb(perf_event_ksymbol_output, &ksymbol_event, NULL, false);
return;
err:
WARN_ONCE(1, "%s: Invalid KSYMBOL type 0x%x\n", __func__, ksym_type);
@@ -9261,7 +9285,7 @@ void perf_event_bpf_event(struct bpf_prog *prog,
BUILD_BUG_ON(BPF_TAG_SIZE % sizeof(u64));
memcpy(bpf_event.event_id.tag, prog->tag, BPF_TAG_SIZE);
- perf_iterate_sb(perf_event_bpf_output, &bpf_event, NULL);
+ perf_iterate_sb(perf_event_bpf_output, &bpf_event, NULL, false);
}
struct perf_text_poke_event {
@@ -9345,7 +9369,7 @@ void perf_event_text_poke(const void *addr, const void *old_bytes,
},
};
- perf_iterate_sb(perf_event_text_poke_output, &text_poke_event, NULL);
+ perf_iterate_sb(perf_event_text_poke_output, &text_poke_event, NULL, false);
}
void perf_event_itrace_started(struct perf_event *event)
--
2.30.GIT
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