[tip: perf/core] perf/core: Save the dynamic parts of sample data size

[tip-bot2 for Namhyung Kim]

The following commit has been merged into the perf/core branch of tip:

Commit-ID:     4cf7a136115e96241f9f1089d2b53c47accf3823
Gitweb:        https://git.kernel.org/tip/4cf7a136115e96241f9f1089d2b53c47accf3823
Author:        Namhyung Kim <namhyung@xxxxxxxxxx>
AuthorDate:    Tue, 17 Jan 2023 22:05:52 -08:00
Committer:     Ingo Molnar <mingo@xxxxxxxxxx>
CommitterDate: Wed, 18 Jan 2023 11:57:19 +01:00

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@xxxxxxxxxx>
Signed-off-by: Ingo Molnar <mingo@xxxxxxxxxx>
Tested-by: Jiri Olsa <jolsa@xxxxxxxxxx>
Acked-by: Jiri Olsa <jolsa@xxxxxxxxxx>
Acked-by: Song Liu <song@xxxxxxxxxx>
Acked-by: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
Link: https://lore.kernel.org/r/20230118060559.615653-2-namhyung@xxxxxxxxxx
---
 include/linux/perf_event.h |  2 ++
 kernel/events/core.c       | 17 ++++++++++-------
 2 files changed, 12 insertions(+), 7 deletions(-)

diff --git a/include/linux/perf_event.h b/include/linux/perf_event.h
index 03949d0..16b9800 100644
--- a/include/linux/perf_event.h
+++ b/include/linux/perf_event.h
@@ -1103,6 +1103,7 @@ struct perf_sample_data {
 	 */
 	u64				sample_flags;
 	u64				period;
+	u64				dyn_size;
 
 	/*
 	 * Fields commonly set by __perf_event_header__init_id(),
@@ -1158,6 +1159,7 @@ static inline void perf_sample_data_init(struct perf_sample_data *data,
 	/* remaining struct members initialized in perf_prepare_sample() */
 	data->sample_flags = PERF_SAMPLE_PERIOD;
 	data->period = period;
+	data->dyn_size = 0;
 
 	if (addr) {
 		data->addr = addr;
diff --git a/kernel/events/core.c b/kernel/events/core.c
index d56328e..827082d 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