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Date: Thu, 13 Jul 2023 16:19:27 +0300
From: Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>
To: linux-kselftest@...r.kernel.org,
Reinette Chatre <reinette.chatre@...el.com>,
Shuah Khan <shuah@...nel.org>,
Shaopeng Tan <tan.shaopeng@...fujitsu.com>,
Fenghua Yu <fenghua.yu@...el.com>, linux-kernel@...r.kernel.org
Cc: Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>
Subject: [PATCH v4 14/19] selftests/resctrl: Improve parameter consistency in fill_buf
fill_buf's arguments can be improved in multiple ways:
- Multiple functions in fill_buf have start_ptr as one of their
argument which is a bit long and the extra "start" is pretty
obvious when it comes to pointers.
- Some of the functions take end_ptr and others size_t to indicate
the end of the buffer.
- Some arguments meaning buffer size are called just 's'
- mem_flush() takes void * but immediately converts it to char *
Cleanup the parameters to make things simpler and more consistent:
- Rename start_ptr to simply buf as it's shorter.
- Replace end_ptr and s parameters with buf_size and only calculate
end_ptr in the functions that truly use it.
- Make mem_flush() parameters to follow the same convention as the
other functions in fill_buf.
- convert mem_flush() char * to unsigned char *.
While at it, fix also a typo in a comment.
Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>
---
tools/testing/selftests/resctrl/fill_buf.c | 49 +++++++++++-----------
1 file changed, 24 insertions(+), 25 deletions(-)
diff --git a/tools/testing/selftests/resctrl/fill_buf.c b/tools/testing/selftests/resctrl/fill_buf.c
index a5ec9c82a960..5f16c4f5dfbf 100644
--- a/tools/testing/selftests/resctrl/fill_buf.c
+++ b/tools/testing/selftests/resctrl/fill_buf.c
@@ -38,32 +38,32 @@ static void cl_flush(void *p)
#endif
}
-static void mem_flush(void *p, size_t s)
+static void mem_flush(unsigned char *buf, size_t buf_size)
{
- char *cp = (char *)p;
+ unsigned char *cp = buf;
size_t i = 0;
- s = s / CL_SIZE; /* mem size in cache llines */
+ buf_size = buf_size / CL_SIZE; /* mem size in cache lines */
- for (i = 0; i < s; i++)
+ for (i = 0; i < buf_size; i++)
cl_flush(&cp[i * CL_SIZE]);
sb();
}
-static void *malloc_and_init_memory(size_t s)
+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, s);
+ ret = posix_memalign(&p, PAGE_SIZE, buf_size);
if (ret < 0)
return NULL;
p64 = (uint64_t *)p;
- s64 = s / sizeof(uint64_t);
+ s64 = buf_size / sizeof(uint64_t);
while (s64 > 0) {
*p64 = (uint64_t)rand();
@@ -74,12 +74,13 @@ static void *malloc_and_init_memory(size_t s)
return p;
}
-static int fill_one_span_read(unsigned char *start_ptr, unsigned char *end_ptr)
+static int fill_one_span_read(unsigned char *buf, size_t buf_size)
{
+ unsigned char *end_ptr = buf + buf_size;
unsigned char sum, *p;
sum = 0;
- p = start_ptr;
+ p = buf;
while (p < end_ptr) {
sum += *p;
p += (CL_SIZE / 2);
@@ -88,26 +89,26 @@ static int fill_one_span_read(unsigned char *start_ptr, unsigned char *end_ptr)
return sum;
}
-static
-void fill_one_span_write(unsigned char *start_ptr, unsigned char *end_ptr)
+static void fill_one_span_write(unsigned char *buf, size_t buf_size)
{
+ unsigned char *end_ptr = buf + buf_size;
unsigned char *p;
- p = start_ptr;
+ p = buf;
while (p < end_ptr) {
*p = '1';
p += (CL_SIZE / 2);
}
}
-static int fill_cache_read(unsigned char *start_ptr, unsigned char *end_ptr,
+static int fill_cache_read(unsigned char *buf, size_t buf_size,
char *resctrl_val)
{
int ret = 0;
FILE *fp;
while (1) {
- ret = fill_one_span_read(start_ptr, end_ptr);
+ ret = fill_one_span_read(buf, buf_size);
if (!strncmp(resctrl_val, CAT_STR, sizeof(CAT_STR)))
break;
}
@@ -124,11 +125,11 @@ static int fill_cache_read(unsigned char *start_ptr, unsigned char *end_ptr,
return 0;
}
-static int fill_cache_write(unsigned char *start_ptr, unsigned char *end_ptr,
+static int fill_cache_write(unsigned char *buf, size_t buf_size,
char *resctrl_val)
{
while (1) {
- fill_one_span_write(start_ptr, end_ptr);
+ fill_one_span_write(buf, buf_size);
if (!strncmp(resctrl_val, CAT_STR, sizeof(CAT_STR)))
break;
}
@@ -138,25 +139,23 @@ static int fill_cache_write(unsigned char *start_ptr, unsigned char *end_ptr,
static int fill_cache(size_t buf_size, int memflush, int op, char *resctrl_val)
{
- unsigned char *start_ptr, *end_ptr;
+ unsigned char *buf;
int ret;
- start_ptr = malloc_and_init_memory(buf_size);
- if (!start_ptr)
+ buf = malloc_and_init_memory(buf_size);
+ if (!buf)
return -1;
- end_ptr = start_ptr + buf_size;
-
/* Flush the memory before using to avoid "cache hot pages" effect */
if (memflush)
- mem_flush(start_ptr, buf_size);
+ mem_flush(buf, buf_size);
if (op == 0)
- ret = fill_cache_read(start_ptr, end_ptr, resctrl_val);
+ ret = fill_cache_read(buf, buf_size, resctrl_val);
else
- ret = fill_cache_write(start_ptr, end_ptr, resctrl_val);
+ ret = fill_cache_write(buf, buf_size, resctrl_val);
- free(start_ptr);
+ free(buf);
if (ret) {
printf("\n Error in fill cache read/write...\n");
--
2.30.2
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