[PATCH v3 01/16] selftests/resctrl: Open get_mem_bw_imc() fd for loops

From: Ilpo Järvinen
Date: Mon Apr 08 2024 - 12:33:23 EST


get_mem_bw_imc() handles fds in a for loop but close() is based on two
fixed indexes READ and WRITE.

Open code all for loops to READ+WRITE entries for clarity.

Suggested-by: Reinette Chatre <reinette.chatre@xxxxxxxxx>
Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@xxxxxxxxxxxxxxx>
---

v3:
- Rework entirely, use open coding instead of for loops for clarity
---
tools/testing/selftests/resctrl/resctrl_val.c | 22 ++++++++++---------
1 file changed, 12 insertions(+), 10 deletions(-)

diff --git a/tools/testing/selftests/resctrl/resctrl_val.c b/tools/testing/selftests/resctrl/resctrl_val.c
index 445f306d4c2f..456cf0d0b8ca 100644
--- a/tools/testing/selftests/resctrl/resctrl_val.c
+++ b/tools/testing/selftests/resctrl/resctrl_val.c
@@ -306,26 +306,28 @@ static int initialize_mem_bw_imc(void)
static int get_mem_bw_imc(int cpu_no, char *bw_report, float *bw_imc)
{
float reads, writes, of_mul_read, of_mul_write;
- int imc, j, ret;
+ int imc, ret;

/* Start all iMC counters to log values (both read and write) */
reads = 0, writes = 0, of_mul_read = 1, of_mul_write = 1;
for (imc = 0; imc < imcs; imc++) {
- for (j = 0; j < 2; j++) {
- ret = open_perf_event(imc, cpu_no, j);
- if (ret)
- return -1;
- }
- for (j = 0; j < 2; j++)
- membw_ioctl_perf_event_ioc_reset_enable(imc, j);
+ ret = open_perf_event(imc, cpu_no, READ);
+ if (ret)
+ return -1;
+ ret = open_perf_event(imc, cpu_no, WRITE);
+ if (ret)
+ return -1;
+
+ membw_ioctl_perf_event_ioc_reset_enable(imc, READ);
+ membw_ioctl_perf_event_ioc_reset_enable(imc, WRITE);
}

sleep(1);

/* Stop counters after a second to get results (both read and write) */
for (imc = 0; imc < imcs; imc++) {
- for (j = 0; j < 2; j++)
- membw_ioctl_perf_event_ioc_disable(imc, j);
+ membw_ioctl_perf_event_ioc_disable(imc, READ);
+ membw_ioctl_perf_event_ioc_disable(imc, WRITE);
}

/*
--
2.39.2