From: Dmitry Vyukov <dvyukov@google.com>
Date: Thu, 13 Feb 2025 09:08:22 +0000 (+0100)
Subject: perf hist: Shrink struct hist_entry size
X-Git-Tag: block-6.15-20250403~13^2~168
X-Git-Url: https://git.kernel.dk/?a=commitdiff_plain;h=5e838165d0c2d7eff5f515756e0414bf289d70b9;p=linux-block.git

perf hist: Shrink struct hist_entry size

Reorder the struct fields by size to reduce paddings and reduce
struct simd_flags size from 8 to 1 byte.

This reduces struct hist_entry size by 8 bytes (592->584),
and leaves a single more usable 6 byte padding hole.

Signed-off-by: Dmitry Vyukov <dvyukov@google.com>
Reviewed-by: Andi Kleen <ak@linux.intel.com>
Link: https://lore.kernel.org/r/7c1cb1c8f9901e945162701ba7269d0f9c70be89.1739437531.git.dvyukov@google.com
Signed-off-by: Namhyung Kim <namhyung@kernel.org>
---

diff --git a/tools/perf/util/hist.h b/tools/perf/util/hist.h
index 29d4c7a3d174..317d06cca8b8 100644
--- a/tools/perf/util/hist.h
+++ b/tools/perf/util/hist.h
@@ -239,16 +239,16 @@ struct hist_entry {
 	u64			cgroup;
 	u64			ip;
 	u64			transaction;
-	s32			socket;
-	s32			cpu;
-	int			parallelism;
 	u64			code_page_size;
 	u64			weight;
 	u64			ins_lat;
 	u64			p_stage_cyc;
+	s32			socket;
+	s32			cpu;
+	int			parallelism;
+	int			mem_type_off;
 	u8			cpumode;
 	u8			depth;
-	int			mem_type_off;
 	struct simd_flags	simd_flags;
 
 	/* We are added by hists__add_dummy_entry. */
diff --git a/tools/perf/util/sample.h b/tools/perf/util/sample.h
index bbf71e6406c4..0e96240052e9 100644
--- a/tools/perf/util/sample.h
+++ b/tools/perf/util/sample.h
@@ -67,7 +67,7 @@ struct aux_sample {
 };
 
 struct simd_flags {
-	u64	arch:1,	/* architecture (isa) */
+	u8	arch:1,	/* architecture (isa) */
 		pred:2;	/* predication */
 };