A missing break in kms_tests leads to kselftest hang when the parameter -s is used. In current code flow because of missing break in -s, -t parses args spilled from -s and as -t accepts only valid values as 0,1 so any arg in -s >1 or <0, gets in ksm_test failure
This went undetected since, before the addition of option -t, the next case -M would immediately break out of the switch statement but that is no longer the case
Add the missing break statement.
----Before---- ./ksm_tests -H -s 100 Invalid merge type
----After---- ./ksm_tests -H -s 100 Number of normal pages: 0 Number of huge pages: 50 Total size: 100 MiB Total time: 0.401732682 s Average speed: 248.922 MiB/s
Fixes: 07115fcc15b4 ("selftests/mm: add new selftests for KSM")
Signed-off-by: Ayush Jain ayush.jain3@amd.com Reviewed-by: David Hildenbrand david@redhat.com --- v1 -> v2 collect Reviewed-by from David Updated Fixes tag from commit 9e7cb94ca218 to 07115fcc15b4
tools/testing/selftests/mm/ksm_tests.c | 1 + 1 file changed, 1 insertion(+)
diff --git a/tools/testing/selftests/mm/ksm_tests.c b/tools/testing/selftests/mm/ksm_tests.c index 435acebdc325..380b691d3eb9 100644 --- a/tools/testing/selftests/mm/ksm_tests.c +++ b/tools/testing/selftests/mm/ksm_tests.c @@ -831,6 +831,7 @@ int main(int argc, char *argv[]) printf("Size must be greater than 0\n"); return KSFT_FAIL; } + break; case 't': { int tmp = atoi(optarg);
add KSM_MERGE_TIME and KSM_MERGE_TIME_HUGE_PAGES tests with size of 100.
./run_vmtests.sh -t ksm ----------------------------- running ./ksm_tests -H -s 100 ----------------------------- Number of normal pages: 0 Number of huge pages: 50 Total size: 100 MiB Total time: 0.399844662 s Average speed: 250.097 MiB/s [PASS] ----------------------------- running ./ksm_tests -P -s 100 ----------------------------- Total size: 100 MiB Total time: 0.451931496 s Average speed: 221.272 MiB/s [PASS]
Signed-off-by: Ayush Jain ayush.jain3@amd.com Reviewed-by: David Hildenbrand david@redhat.com --- v1 -> v2 collect Reviewed-by from David
tools/testing/selftests/mm/run_vmtests.sh | 4 ++++ 1 file changed, 4 insertions(+)
diff --git a/tools/testing/selftests/mm/run_vmtests.sh b/tools/testing/selftests/mm/run_vmtests.sh index 3f26f6e15b2a..ca3738e042c2 100755 --- a/tools/testing/selftests/mm/run_vmtests.sh +++ b/tools/testing/selftests/mm/run_vmtests.sh @@ -262,6 +262,10 @@ CATEGORY="madv_populate" run_test ./madv_populate
CATEGORY="memfd_secret" run_test ./memfd_secret
+# KSM KSM_MERGE_TIME_HUGE_PAGES test with size of 100 +CATEGORY="ksm" run_test ./ksm_tests -H -s 100 +# KSM KSM_MERGE_TIME test with size of 100 +CATEGORY="ksm" run_test ./ksm_tests -P -s 100 # KSM MADV_MERGEABLE test with 10 identical pages CATEGORY="ksm" run_test ./ksm_tests -M -p 10 # KSM unmerge test
Ayush Jain ayush.jain3@amd.com writes:
A missing break in kms_tests leads to kselftest hang when the parameter -s is used. In current code flow because of missing break in -s, -t parses args spilled from -s and as -t accepts only valid values as 0,1 so any arg in -s >1 or <0, gets in ksm_test failure
This went undetected since, before the addition of option -t, the next case -M would immediately break out of the switch statement but that is no longer the case
Add the missing break statement.
----Before---- ./ksm_tests -H -s 100 Invalid merge type
----After---- ./ksm_tests -H -s 100 Number of normal pages: 0 Number of huge pages: 50 Total size: 100 MiB Total time: 0.401732682 s Average speed: 248.922 MiB/s
Fixes: 07115fcc15b4 ("selftests/mm: add new selftests for KSM")
Signed-off-by: Ayush Jain ayush.jain3@amd.com Reviewed-by: David Hildenbrand david@redhat.com
v1 -> v2 collect Reviewed-by from David Updated Fixes tag from commit 9e7cb94ca218 to 07115fcc15b4
tools/testing/selftests/mm/ksm_tests.c | 1 + 1 file changed, 1 insertion(+)
diff --git a/tools/testing/selftests/mm/ksm_tests.c b/tools/testing/selftests/mm/ksm_tests.c index 435acebdc325..380b691d3eb9 100644 --- a/tools/testing/selftests/mm/ksm_tests.c +++ b/tools/testing/selftests/mm/ksm_tests.c @@ -831,6 +831,7 @@ int main(int argc, char *argv[]) printf("Size must be greater than 0\n"); return KSFT_FAIL; }
break;
Acked-by: Stefan Roesch shr@devkernel.io
linux-kselftest-mirror@lists.linaro.org
-
Ayush Jain -
Stefan Roesch