linux-kernel - [PATCH V1 04/13] selftests/resctrl: Ensure sibling CPU is not same as original CPU

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Date:   Fri,  6 Mar 2020 19:40:45 -0800
From:   Sai Praneeth Prakhya <sai.praneeth.prakhya@...el.com>
To:     shuah@...nel.org, linux-kselftest@...r.kernel.org
Cc:     tglx@...utronix.de, mingo@...hat.com, bp@...en8.de,
        tony.luck@...el.com, reinette.chatre@...el.com, babu.moger@....com,
        james.morse@....com, ravi.v.shankar@...el.com,
        fenghua.yu@...el.com, x86@...nel.org, linux-kernel@...r.kernel.org,
        Sai Praneeth Prakhya <sai.praneeth.prakhya@...el.com>
Subject: [PATCH V1 04/13] selftests/resctrl: Ensure sibling CPU is not same as original CPU

From: Reinette Chatre <reinette.chatre@...el.com>

The resctrl tests can accept a CPU on which the tests are run and use
default of CPU #1 if it is not provided. In the CAT test a "sibling CPU"
is determined that is from the same package where another thread will be
run.

The current algorithm with which a "sibling CPU" is determined does not
take the provided/default CPU into account and when that CPU is the
first CPU in a package then the "sibling CPU" will be selected to be the
same CPU since it starts by picking the first CPU from core_siblings_list.

Fix the "sibling CPU" selection by taking the provided/default CPU into
account and ensuring a sibling that is a different CPU is selected.

Signed-off-by: Reinette Chatre <reinette.chatre@...el.com>
Signed-off-by: Sai Praneeth Prakhya <sai.praneeth.prakhya@...el.com>
---
 tools/testing/selftests/resctrl/resctrlfs.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tools/testing/selftests/resctrl/resctrlfs.c b/tools/testing/selftests/resctrl/resctrlfs.c
index 226dd7fdcfb1..465faaad3239 100644
--- a/tools/testing/selftests/resctrl/resctrlfs.c
+++ b/tools/testing/selftests/resctrl/resctrlfs.c
@@ -268,7 +268,7 @@ int get_core_sibling(int cpu_no)
 	while (token) {
 		sibling_cpu_no = atoi(token);
 		/* Skipping core 0 as we don't want to run test on core 0 */
-		if (sibling_cpu_no != 0)
+		if (sibling_cpu_no != 0 && sibling_cpu_no != cpu_no)
 			break;
 		token = strtok(NULL, "-,");
 	}
-- 
2.7.4