linux-kernel - [PATCH v4 02/13] perf bench mem: Defer type munging of size to float

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Message-Id: <20250616052223.723982-3-ankur.a.arora@oracle.com>
Date: Sun, 15 Jun 2025 22:22:12 -0700
From: Ankur Arora <ankur.a.arora@...cle.com>
To: linux-kernel@...r.kernel.org, linux-mm@...ck.org, x86@...nel.org
Cc: akpm@...ux-foundation.org, bp@...en8.de, dave.hansen@...ux.intel.com,
        hpa@...or.com, mingo@...hat.com, mjguzik@...il.com, luto@...nel.org,
        peterz@...radead.org, acme@...nel.org, namhyung@...nel.org,
        tglx@...utronix.de, willy@...radead.org, jon.grimm@....com,
        bharata@....com, raghavendra.kt@....com, boris.ostrovsky@...cle.com,
        konrad.wilk@...cle.com, ankur.a.arora@...cle.com
Subject: [PATCH v4 02/13] perf bench mem: Defer type munging of size to float

Do type conversion to double at the point of use.

Signed-off-by: Ankur Arora <ankur.a.arora@...cle.com>
---
 tools/perf/bench/mem-functions.c | 14 +++++++-------
 1 file changed, 7 insertions(+), 7 deletions(-)

diff --git a/tools/perf/bench/mem-functions.c b/tools/perf/bench/mem-functions.c
index 8599ed96ee1f..b8f020379197 100644
--- a/tools/perf/bench/mem-functions.c
+++ b/tools/perf/bench/mem-functions.c
@@ -139,7 +139,7 @@ struct bench_mem_info {
 	bool alloc_src;
 };
 
-static void __bench_mem_function(struct bench_mem_info *info, int r_idx, size_t size, double size_total)
+static void __bench_mem_function(struct bench_mem_info *info, int r_idx, size_t size, size_t size_total)
 {
 	const struct function *r = &info->functions[r_idx];
 	double result_bps = 0.0;
@@ -165,18 +165,18 @@ static void __bench_mem_function(struct bench_mem_info *info, int r_idx, size_t
 	switch (bench_format) {
 	case BENCH_FORMAT_DEFAULT:
 		if (use_cycles) {
-			printf(" %14lf cycles/byte\n", (double)rt.cycles/size_total);
+			printf(" %14lf cycles/byte\n", (double)rt.cycles/(double)size_total);
 		} else {
-			result_bps = size_total/timeval2double(&rt.tv);
+			result_bps = (double)size_total/timeval2double(&rt.tv);
 			print_bps(result_bps);
 		}
 		break;
 
 	case BENCH_FORMAT_SIMPLE:
 		if (use_cycles) {
-			printf("%lf\n", (double)rt.cycles/size_total);
+			printf("%lf\n", (double)rt.cycles/(double)size_total);
 		} else {
-			result_bps = size_total/timeval2double(&rt.tv);
+			result_bps = (double)size_total/timeval2double(&rt.tv);
 			printf("%lf\n", result_bps);
 		}
 		break;
@@ -199,7 +199,7 @@ static int bench_mem_common(int argc, const char **argv, struct bench_mem_info *
 {
 	int i;
 	size_t size;
-	double size_total;
+	size_t size_total;
 
 	argc = parse_options(argc, argv, options, info->usage, 0);
 
@@ -212,7 +212,7 @@ static int bench_mem_common(int argc, const char **argv, struct bench_mem_info *
 	}
 
 	size = (size_t)perf_atoll((char *)size_str);
-	size_total = (double)size * nr_loops;
+	size_total = (size_t)size * nr_loops;
 
 	if ((s64)size <= 0) {
 		fprintf(stderr, "Invalid size:%s\n", size_str);
-- 
2.31.1