This is a note to let you know that I've just added the patch titled
selftests/resctrl: Refactor fill_buf functions
to the 6.6-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
selftests-resctrl-refactor-fill_buf-functions.patch
and it can be found in the queue-6.6 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit d393d98a354a37c257dbd624ed829f02fc61869e
Author: Ilpo Järvinen <ilpo.jarvinen@xxxxxxxxxxxxxxx>
Date: Fri Dec 15 17:04:52 2023 +0200
selftests/resctrl: Refactor fill_buf functions
[ Upstream commit 24be05591fb7a2a3edd639092c045298dd57aeea ]
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 and remove the
duplicated error print.
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@xxxxxxxxxxxxxxx>
Reviewed-by: Reinette Chatre <reinette.chatre@xxxxxxxxx>
Signed-off-by: Shuah Khan <skhan@xxxxxxxxxxxxxxxxxxx>
Stable-dep-of: caf02626b2bf ("selftests/resctrl: Fix memory overflow due to unhandled wraparound")
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/tools/testing/selftests/resctrl/fill_buf.c b/tools/testing/selftests/resctrl/fill_buf.c
index 6d1d5eed595cd..635f938b11f09 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;
@@ -164,21 +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);
-
- if (ret) {
- printf("\n Error in fill cache read/write...\n");
- return -1;
- }
-
- 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 dd3546655657a..a848e9c755787 100644
--- a/tools/testing/selftests/resctrl/resctrl.h
+++ b/tools/testing/selftests/resctrl/resctrl.h
@@ -91,7 +91,7 @@ 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);
