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authorNamhyung Kim <namhyung@kernel.org>2023-01-17 22:05:52 -0800
committerIngo Molnar <mingo@kernel.org>2023-01-18 11:57:19 +0100
commit4cf7a136115e96241f9f1089d2b53c47accf3823 (patch)
treeff5a1458b75ba4582594974c05d46680797f3914 /kernel/events/core.c
parent65adf3a57c0c2e79c5c2b72a4bdcabcab9e99ec1 (diff)
perf/core: Save the dynamic parts of sample data size
The perf sample data can be divided into parts. The event->header_size and event->id_header_size keep the static part of the sample data which is determined by the sample_type flags. But other parts like CALLCHAIN and BRANCH_STACK are changing dynamically so it needs to see the actual data. In preparation of handling repeated calls for perf_prepare_sample(), it can save the dynamic size to the perf sample data to avoid the duplicate work. Signed-off-by: Namhyung Kim <namhyung@kernel.org> Signed-off-by: Ingo Molnar <mingo@kernel.org> Tested-by: Jiri Olsa <jolsa@kernel.org> Acked-by: Jiri Olsa <jolsa@kernel.org> Acked-by: Song Liu <song@kernel.org> Acked-by: Peter Zijlstra <peterz@infradead.org> Link: https://lore.kernel.org/r/20230118060559.615653-2-namhyung@kernel.org
Diffstat (limited to 'kernel/events/core.c')
-rw-r--r--kernel/events/core.c17
1 files changed, 10 insertions, 7 deletions
diff --git a/kernel/events/core.c b/kernel/events/core.c
index d56328e5080e..827082d1e7f9 100644
--- a/kernel/events/core.c
+++ b/kernel/events/core.c
@@ -7586,7 +7586,7 @@ void perf_prepare_sample(struct perf_event_header *header,
size += data->callchain->nr;
- header->size += size * sizeof(u64);
+ data->dyn_size += size * sizeof(u64);
}
if (sample_type & PERF_SAMPLE_RAW) {
@@ -7612,7 +7612,7 @@ void perf_prepare_sample(struct perf_event_header *header,
data->raw = NULL;
}
- header->size += size;
+ data->dyn_size += size;
}
if (sample_type & PERF_SAMPLE_BRANCH_STACK) {
@@ -7624,7 +7624,7 @@ void perf_prepare_sample(struct perf_event_header *header,
size += data->br_stack->nr
* sizeof(struct perf_branch_entry);
}
- header->size += size;
+ data->dyn_size += size;
}
if (sample_type & (PERF_SAMPLE_REGS_USER | PERF_SAMPLE_STACK_USER))
@@ -7639,7 +7639,7 @@ void perf_prepare_sample(struct perf_event_header *header,
size += hweight64(mask) * sizeof(u64);
}
- header->size += size;
+ data->dyn_size += size;
}
if (sample_type & PERF_SAMPLE_STACK_USER) {
@@ -7664,7 +7664,7 @@ void perf_prepare_sample(struct perf_event_header *header,
size += sizeof(u64) + stack_size;
data->stack_user_size = stack_size;
- header->size += size;
+ data->dyn_size += size;
}
if (filtered_sample_type & PERF_SAMPLE_WEIGHT_TYPE)
@@ -7693,7 +7693,7 @@ void perf_prepare_sample(struct perf_event_header *header,
size += hweight64(mask) * sizeof(u64);
}
- header->size += size;
+ data->dyn_size += size;
}
if (sample_type & PERF_SAMPLE_PHYS_ADDR &&
@@ -7738,8 +7738,11 @@ void perf_prepare_sample(struct perf_event_header *header,
size = perf_prepare_sample_aux(event, data, size);
WARN_ON_ONCE(size + header->size > U16_MAX);
- header->size += size;
+ data->dyn_size += size + sizeof(u64); /* size above */
}
+
+ header->size += data->dyn_size;
+
/*
* If you're adding more sample types here, you likely need to do
* something about the overflowing header::size, like repurpose the