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linux/tools/testing/selftests
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Sean Christopherson 7b0035eaa7 KVM: selftests: Ensure all migrations are performed when test is affined 
Rework the CPU selection in the migration worker to ensure the specified
number of migrations are performed when the test iteslf is affined to a
subset of CPUs.  The existing logic skips iterations if the target CPU is
not in the original set of possible CPUs, which causes the test to fail
if too many iterations are skipped.

  ==== Test Assertion Failure ====
  rseq_test.c:228: i > (NR_TASK_MIGRATIONS / 2)
  pid=10127 tid=10127 errno=4 - Interrupted system call
     1  0x00000000004018e5: main at rseq_test.c:227
     2  0x00007fcc8fc66bf6: ?? ??:0
     3  0x0000000000401959: _start at ??:?
  Only performed 4 KVM_RUNs, task stalled too much?

Calculate the min/max possible CPUs as a cheap "best effort" to avoid
high runtimes when the test is affined to a small percentage of CPUs.
Alternatively, a list or xarray of the possible CPUs could be used, but
even in a horrendously inefficient setup, such optimizations are not
needed because the runtime is completely dominated by the cost of
migrating the task, and the absolute runtime is well under a minute in
even truly absurd setups, e.g. running on a subset of vCPUs in a VM that
is heavily overcommited (16 vCPUs per pCPU).

Fixes: 61e52f1630 ("KVM: selftests: Add a test for KVM_RUN+rseq to detect task migration bugs")
Reported-by: Dongli Zhang <dongli.zhang@oracle.com>
Signed-off-by: Sean Christopherson <seanjc@google.com>
Message-Id: <20210929234112.1862848-1-seanjc@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2021-09-30 04:25:57 -04:00
..
arm64 kselftest/arm64: signal: Add a TODO list for signal handling tests 2021-08-23 11:11:05 +01:00
bpf Merge git://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf 2021-09-14 13:09:54 +01:00
breakpoints selftests: breakpoints: Use correct error messages in breakpoint_test_arm64.c 2021-02-08 17:04:41 -07:00
capabilities
cgroup tests/cgroup: test cgroup.kill 2021-05-10 10:41:11 -04:00
clone3 selftests/clone3: Fix build error 2020-12-07 14:34:55 -07:00
core selftests/core: add regression test for CLOSE_RANGE_UNSHARE | CLOSE_RANGE_CLOEXEC 2020-12-19 16:23:19 +01:00
cpu-hotplug
cpufreq selftests/cpufreq: Rename DEBUG_PI_LIST to DEBUG_PLIST 2021-08-31 11:00:02 -06:00
damon mm/damon: add user space selftests 2021-09-08 11:50:25 -07:00
dma dma-mapping: benchmark: Add support for multi-pages map/unmap 2021-04-02 16:41:08 +02:00
dmabuf-heaps kselftests: dmabuf-heaps: Add extra checking that allocated buffers are zeroed 2021-02-08 16:25:53 -07:00
drivers testing: selftests: drivers: net: netdevsim: devlink: add test case for hard drop statistics 2021-06-14 13:04:25 -07:00
efivarfs
exec tools/testing/selftests/exec: fix link error 2021-05-22 15:09:07 -10:00
filesystems selftests/binderfs: add test for feature files 2021-07-21 13:46:36 +02:00
firmware selftests: firmware: Fix ignored return val of asprintf() warn 2021-07-21 16:11:42 +02:00
fpu
ftrace selftests/ftrace: Exclude "(fault)" in testing add/remove eprobe events 2021-09-08 15:29:16 -04:00
futex selftests: futex: Add futex compare requeue test 2021-06-22 11:20:16 +02:00
gpio selftests: gpio: update .gitignore 2021-03-08 11:59:16 +01:00
ia64
intel_pstate selftests: intel_pstate: ftime() is deprecated 2020-11-10 14:41:32 -07:00
ipc selftests/ipc: remove unneeded semicolon 2021-02-08 16:32:43 -07:00
ir
kcmp
kexec
kmod
kselftest tweewide: Fix most Shebang lines 2020-12-08 23:30:04 +09:00
kvm KVM: selftests: Ensure all migrations are performed when test is affined 2021-09-30 04:25:57 -04:00
landlock landlock: Enable user space to infer supported features 2021-04-22 12:22:11 -07:00
lib selftests: lib: Add wrapper script for test_scanf 2021-05-19 15:05:11 +02:00
livepatch
lkdtm lkdtm/fortify: Consolidate FORTIFY_SOURCE tests 2021-08-18 22:28:51 +02:00
locking
media_tests
membarrier
memfd selftests/memfd: remove unused variable 2021-09-08 11:50:28 -07:00
memory-hotplug selftests: memory-hotplug: avoid spamming logs with dump_page(), ratio limit hot-remove error test 2021-07-12 14:20:01 -06:00
mincore selftests: remove duplicate include 2021-05-07 00:26:33 -07:00
mount
mount_setattr tests: test MOUNT_ATTR_NOSYMFOLLOW with mount_setattr() 2021-06-01 15:06:51 +02:00
move_mount_set_group tests: add move_mount(MOVE_MOUNT_SET_GROUP) selftest 2021-07-26 14:45:19 +02:00
mqueue
nci selftests: nci: replace unsigned int with int 2021-09-16 13:55:51 +01:00
net selftest: net: fix typo in altname test 2021-09-12 10:48:26 +01:00
netfilter selftest: netfilter: add test case for unreplied tcp connections 2021-07-02 02:05:59 +02:00
nsfs
ntb
openat2 selftests: openat2: Fix testing failure for O_LARGEFILE flag 2021-08-25 13:46:13 -06:00
perf_events signal: Deliver all of the siginfo perf data in _perf 2021-05-18 16:20:54 -05:00
pid_namespace
pidfd selftests: pidfd: drop needless linux/kcmp.h inclusion in pidfd_setns_test.c 2020-10-27 17:04:01 -06:00
powerpc selftests/powerpc: Add scv versions of the basic TM syscall tests 2021-09-13 22:34:11 +10:00
prctl
proc proc: add .gitignore for proc-subset-pid selftest 2021-06-05 08:58:11 -07:00
pstore
ptp
ptrace
rcutorture torture: Make kvm-test-1-run-qemu.sh check for reboot loops 2021-07-27 11:41:33 -07:00
resctrl selftests/resctrl: Fix incorrect parsing of option "-t" 2021-06-07 18:38:58 -06:00
rlimits kselftests: Add test to check for rlimit changes in different user namespaces 2021-04-30 14:14:03 -05:00
rseq rseq/selftests: Fix MEMBARRIER_CMD_PRIVATE_EXPEDITED_RSEQ build error under other arch. 2020-12-07 14:09:45 -07:00
rtc
safesetid selftests: safesetid: Fix spelling mistake "cant" -> "can't" 2021-08-26 15:15:24 -06:00
sched kselftest:sched: remove duplicate include in cs_prctl_test.c 2021-08-25 13:55:30 -06:00
seccomp seccomp updates for v5.14-rc1 2021-06-28 19:49:37 -07:00
sgx selftests/sgx: Fix Q1 and Q2 calculation in sigstruct.c 2021-07-30 17:20:01 -06:00
sigaltstack selftest/sigaltstack: Use the AT_MINSIGSTKSZ aux vector if available 2021-05-19 12:38:17 +02:00
size
sparc64
splice selftests: splice: Adjust for handler fallback removal 2021-06-07 18:39:43 -06:00
static_keys
sync selftests/sync: Remove the deprecated config SYNC 2021-08-31 10:58:00 -06:00
syscall_user_dispatch entry: Use different define for selector variable in SUD 2021-02-06 00:21:42 +01:00
sysctl
tc-testing tc-testing: Add control-plane selftests for sch_mq 2021-08-04 12:42:27 +01:00
timens selftests/timens: Fix gettime_perf to work on powerpc 2021-04-21 22:52:32 +10:00
timers selftests: timers: rtcpie: skip test if default RTC device does not exist 2021-06-07 19:18:52 -06:00
tmpfs
tpm2
uevent
user
vDSO selftests/vDSO: fix ABI selftest on riscv 2021-02-08 16:38:34 -07:00
vm selftests: vm: add COW time test for KSM pages 2021-09-03 09:58:18 -07:00
watchdog
wireguard wireguard: selftests: make sure rp_filter is disabled on vethc 2021-06-04 14:25:14 -07:00
x86 selftests/x86: Fix error: variably modified 'altstack_data' at file scope 2021-08-25 16:54:39 -06:00
zram
.gitignore
gen_kselftest_tar.sh
kselftest.h
kselftest_deps.sh selftests: remove obsolete gpio references from kselftest_deps.sh 2021-02-15 11:43:28 +01:00
kselftest_harness.h selftests: kselftest_harness.h: partially fix kernel-doc markups 2021-01-21 14:06:00 -07:00
kselftest_install.sh
kselftest_module.h kselftest: add support for skipped tests 2021-02-15 11:07:42 +01:00
lib.mk selftests: lib.mk: Also install "config" and "settings" 2021-06-07 19:18:28 -06:00
Makefile Core: 2021-08-31 16:43:06 -07:00
run_kselftest.sh selftests/run_kselftest.sh: fix dry-run typo 2020-11-10 14:51:39 -07:00