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Date: Tue, 25 Jul 2023 08:49:39 -0600
From: Shuah Khan <skhan@...uxfoundation.org>
To: Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>,
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>,
Maciej Wieczor-Retman <maciej.wieczor-retman@...el.com>,
linux-kernel@...r.kernel.org,
Shuah Khan <skhan@...uxfoundation.org>
Subject: Re: [PATCH v5 12/19] selftests/resctrl: Remove
"malloc_and_init_memory" param from run_fill_buf()
On 7/17/23 07:15, Ilpo Järvinen wrote:
> run_fill_buf()'s malloc_and_init_memory parameter is always 1. There's
> also duplicated memory init code for malloc_and_init_memory == 0 case
> in fill_buf() which is unused.
>
> Remove the malloc_and_init_memory parameter and the duplicated mem init
> code.
>
> While at it, fix also a typo in run_fill_buf() prototype's argument.
>
> Co-developed-by: Fenghua Yu <fenghua.yu@...el.com>
> Signed-off-by: Fenghua Yu <fenghua.yu@...el.com>
> Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>
> Reviewed-by: Reinette Chatre <reinette.chatre@...el.com>
> ---
> tools/testing/selftests/resctrl/cache.c | 6 ++--
> tools/testing/selftests/resctrl/fill_buf.c | 28 +++----------------
> tools/testing/selftests/resctrl/resctrl.h | 3 +-
> .../testing/selftests/resctrl/resctrl_tests.c | 13 ++++-----
> tools/testing/selftests/resctrl/resctrlfs.c | 12 ++++----
> 5 files changed, 19 insertions(+), 43 deletions(-)
>
> diff --git a/tools/testing/selftests/resctrl/cache.c b/tools/testing/selftests/resctrl/cache.c
> index 53df66814cd6..63b551c44f1d 100644
> --- a/tools/testing/selftests/resctrl/cache.c
> +++ b/tools/testing/selftests/resctrl/cache.c
> @@ -210,7 +210,7 @@ int measure_cache_vals(struct resctrl_val_param *param, int bm_pid)
> */
> int cat_val(struct resctrl_val_param *param)
> {
> - int malloc_and_init_memory = 1, memflush = 1, operation = 0, ret = 0;
> + int memflush = 1, operation = 0, ret = 0;
> char *resctrl_val = param->resctrl_val;
> pid_t bm_pid;
>
> @@ -247,8 +247,8 @@ int cat_val(struct resctrl_val_param *param)
> if (ret)
> break;
>
> - if (run_fill_buf(param->span, malloc_and_init_memory,
> - memflush, operation, resctrl_val)) {
> + if (run_fill_buf(param->span, memflush, operation,
> + resctrl_val)) {
> fprintf(stderr, "Error-running fill buffer\n");
> ret = -1;
> goto pe_close;
> diff --git a/tools/testing/selftests/resctrl/fill_buf.c b/tools/testing/selftests/resctrl/fill_buf.c
> index 785cbd8d0148..d8f5505eb9e6 100644
> --- a/tools/testing/selftests/resctrl/fill_buf.c
> +++ b/tools/testing/selftests/resctrl/fill_buf.c
> @@ -138,36 +138,18 @@ static int fill_cache_write(unsigned char *start_ptr, unsigned char *end_ptr,
> return 0;
> }
>
> -static int
> -fill_cache(size_t buf_size, int malloc_and_init, int memflush,
> - int op, char *resctrl_val)
> +static int fill_cache(size_t buf_size, int memflush, int op, char *resctrl_val)
> {
> unsigned char *start_ptr, *end_ptr;
> - unsigned long long i;
> int ret;
>
> - if (malloc_and_init)
> - start_ptr = malloc_and_init_memory(buf_size);
> - else
> - start_ptr = malloc(buf_size);
> -
> + start_ptr = malloc_and_init_memory(buf_size);
> if (!start_ptr)
> return -1;
>
> startptr = start_ptr;
> end_ptr = start_ptr + buf_size;
>
> - /*
> - * It's better to touch the memory once to avoid any compiler
> - * optimizations
> - */
> - if (!malloc_and_init) {
> - for (i = 0; i < buf_size; i++)
> - *start_ptr++ = (unsigned char)rand();
> - }
> -
> - start_ptr = startptr;
> -
> /* Flush the memory before using to avoid "cache hot pages" effect */
> if (memflush)
> mem_flush(start_ptr, buf_size);
> @@ -188,14 +170,12 @@ fill_cache(size_t buf_size, int malloc_and_init, int memflush,
> return 0;
> }
>
> -int run_fill_buf(size_t span, int malloc_and_init_memory, int memflush, int op,
> - char *resctrl_val)
> +int run_fill_buf(size_t span, int memflush, int op, char *resctrl_val)
> {
> size_t cache_size = span;
> int ret;
>
> - ret = fill_cache(cache_size, malloc_and_init_memory, memflush, op,
> - resctrl_val);
> + ret = fill_cache(cache_size, memflush, op, resctrl_val);
> 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 52068ceea956..3054cc4ef0e3 100644
> --- a/tools/testing/selftests/resctrl/resctrl.h
> +++ b/tools/testing/selftests/resctrl/resctrl.h
> @@ -97,8 +97,7 @@ 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 malloc_and_init_memory, int memflush, int op,
> - char *resctrl_va);
> +int run_fill_buf(size_t span, int memflush, int op, char *resctrl_val);
> int resctrl_val(char **benchmark_cmd, struct resctrl_val_param *param);
> int mbm_bw_change(size_t span, int cpu_no, char *bw_report, char **benchmark_cmd);
> void tests_cleanup(void);
> diff --git a/tools/testing/selftests/resctrl/resctrl_tests.c b/tools/testing/selftests/resctrl/resctrl_tests.c
> index bf0cadab36b0..125ed0ca11e3 100644
> --- a/tools/testing/selftests/resctrl/resctrl_tests.c
> +++ b/tools/testing/selftests/resctrl/resctrl_tests.c
> @@ -89,7 +89,7 @@ static void run_mbm_test(bool has_ben, char **benchmark_cmd, size_t span,
> }
>
> if (!has_ben)
> - sprintf(benchmark_cmd[5], "%s", MBA_STR);
> + sprintf(benchmark_cmd[4], "%s", MBA_STR);
> res = mbm_bw_change(span, cpu_no, bw_report, benchmark_cmd);
> ksft_test_result(!res, "MBM: bw change\n");
> if ((get_vendor() == ARCH_INTEL) && res)
> @@ -141,7 +141,7 @@ static void run_cmt_test(bool has_ben, char **benchmark_cmd, int cpu_no)
> }
>
> if (!has_ben)
> - sprintf(benchmark_cmd[5], "%s", CMT_STR);
> + sprintf(benchmark_cmd[4], "%s", CMT_STR);
> res = cmt_resctrl_val(cpu_no, 5, benchmark_cmd);
> ksft_test_result(!res, "CMT: test\n");
> if ((get_vendor() == ARCH_INTEL) && res)
> @@ -267,16 +267,15 @@ int main(int argc, char **argv)
> benchmark_cmd[ben_count] = NULL;
> } else {
> /* If no benchmark is given by "-b" argument, use fill_buf. */
> - for (i = 0; i < 6; i++)
> + for (i = 0; i < 5; i++)
> benchmark_cmd[i] = benchmark_cmd_area[i];
>
> strcpy(benchmark_cmd[0], "fill_buf");
> sprintf(benchmark_cmd[1], "%zu", span);
> strcpy(benchmark_cmd[2], "1");
> - strcpy(benchmark_cmd[3], "1");
> - strcpy(benchmark_cmd[4], "0");
> - strcpy(benchmark_cmd[5], "");
> - benchmark_cmd[6] = NULL;
> + strcpy(benchmark_cmd[3], "0");
> + strcpy(benchmark_cmd[4], "");
> + benchmark_cmd[5] = NULL;
> }
Lots of copying - can the above be simplified. Also seeing this
warning:
WARNING: Prefer strscpy over strcpy - see: https://github.com/KSPP/linux/issues/88
#233: FILE: tools/testing/selftests/resctrl/resctrl_tests.c:276:
+ strcpy(benchmark_cmd[3], "0");
WARNING: Prefer strscpy over strcpy - see: https://github.com/KSPP/linux/issues/88
#234: FILE: tools/testing/selftests/resctrl/resctrl_tests.c:277:
+ strcpy(benchmark_cmd[4], "");
total: 0 errors, 2 warnings, 142 lines checked
I am applying the patch set to linux-kselftest next - please fix
the aboe and send a patch on top of linux-kselftest next
thanks,
-- Shuah
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