[PATCH v2 03/26] selftests/resctrl: Refactor fill_buf functions

Ilpo Järvinen
2023-11-20T11:14:18Z

There are unnecessary nested calls in fill_buf.c:
- run_fill_buf() calls fill_cache()
- alloc_buffer() calls malloc_and_init_memory()

Simplify the code flow and remove those unnecessary call levels by
moving the called code inside the calling function.

Resolve the difference in run_fill_buf() and fill_cache() parameter
name into 'buf_size' which is more descriptive than 'span'. Also, while
moving the allocation related code, rename 'p' into 'buf' to be
consistent in naming the variables.

Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
---
tools/testing/selftests/resctrl/fill_buf.c | 54 +++++++---------------
tools/testing/selftests/resctrl/resctrl.h | 2 +-
2 files changed, 18 insertions(+), 38 deletions(-)

diff --git a/tools/testing/selftests/resctrl/fill_buf.c b/tools/testing/selftests/resctrl/fill_buf.c
index 6f32f44128e1..b9303a9d819b 100644
--- a/tools/testing/selftests/resctrl/fill_buf.c
+++ b/tools/testing/selftests/resctrl/fill_buf.c
@@ -51,29 +51,6 @@ static void mem_flush(unsigned char *buf, size_t buf_size)
sb();
}

-static void *malloc_and_init_memory(size_t buf_size)
-{
- void *p = NULL;
- uint64_t *p64;
- size_t s64;
- int ret;
-
- ret = posix_memalign(&p, PAGE_SIZE, buf_size);
- if (ret < 0)
- return NULL;
-
- p64 = (uint64_t *)p;
- s64 = buf_size / sizeof(uint64_t);
-
- while (s64 > 0) {
- *p64 = (uint64_t)rand();
- p64 += (CL_SIZE / sizeof(uint64_t));
- s64 -= (CL_SIZE / sizeof(uint64_t));
- }
-
- return p;
-}
-
static int fill_one_span_read(unsigned char *buf, size_t buf_size)
{
unsigned char *end_ptr = buf + buf_size;
@@ -137,12 +114,25 @@ static int fill_cache_write(unsigned char *buf, size_t buf_size, bool once)

static unsigned char *alloc_buffer(size_t buf_size, int memflush)
{
- unsigned char *buf;
+ void *buf = NULL;
+ uint64_t *p64;
+ size_t s64;
+ int ret;

- buf = malloc_and_init_memory(buf_size);
- if (!buf)
+ ret = posix_memalign(&buf, PAGE_SIZE, buf_size);
+ if (ret < 0)
return NULL;

+ /* Initialize the buffer */
+ p64 = buf;
+ s64 = buf_size / sizeof(uint64_t);
+
+ while (s64 > 0) {
+ *p64 = (uint64_t)rand();
+ p64 += (CL_SIZE / sizeof(uint64_t));
+ s64 -= (CL_SIZE / sizeof(uint64_t));
+ }
+
/* Flush the memory before using to avoid "cache hot pages" effect */
if (memflush)
mem_flush(buf, buf_size);
@@ -150,7 +140,7 @@ static unsigned char *alloc_buffer(size_t buf_size, int memflush)
return buf;
}

-static int fill_cache(size_t buf_size, int memflush, int op, bool once)
+int run_fill_buf(size_t buf_size, int memflush, int op, bool once)
{
unsigned char *buf;
int ret;
@@ -164,16 +154,6 @@ static int fill_cache(size_t buf_size, int memflush, int op, bool once)
else
ret = fill_cache_write(buf, buf_size, once);
free(buf);
-
- return ret;
-}
-
-int run_fill_buf(size_t span, int memflush, int op, bool once)
-{
- size_t cache_size = span;
- int ret;
-
- ret = fill_cache(cache_size, memflush, op, once);
if (ret) {
printf("\n Error in fill cache\n");
return -1;
diff --git a/tools/testing/selftests/resctrl/resctrl.h b/tools/testing/selftests/resctrl/resctrl.h
index a33f414f6019..08b95b5a4949 100644
--- a/tools/testing/selftests/resctrl/resctrl.h
+++ b/tools/testing/selftests/resctrl/resctrl.h
@@ -92,7 +92,7 @@ int write_bm_pid_to_resctrl(pid_t bm_pid, char *ctrlgrp, char *mongrp,
char *resctrl_val);
int perf_event_open(struct perf_event_attr *hw_event, pid_t pid, int cpu,
int group_fd, unsigned long flags);
-int run_fill_buf(size_t span, int memflush, int op, bool once);
+int run_fill_buf(size_t buf_size, int memflush, int op, bool once);
int resctrl_val(const char * const *benchmark_cmd, struct resctrl_val_param *param);
int mbm_bw_change(int cpu_no, const char * const *benchmark_cmd);
void tests_cleanup(void);
--
2.30.2