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Message-Id: <20230911111930.16088-2-ilpo.jarvinen@linux.intel.com>
Date: Mon, 11 Sep 2023 14:19:26 +0300
From: Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>
To: Reinette Chatre <reinette.chatre@...el.com>,
Shuah Khan <shuah@...nel.org>,
Shuah Khan <skhan@...uxfoundation.org>,
linux-kselftest@...r.kernel.org,
Maciej Wieczór-Retman
<maciej.wieczor-retman@...el.com>
Cc: linux-kernel@...r.kernel.org,
Shaopeng Tan <tan.shaopeng@...fujitsu.com>,
stable@...r.kernel.org,
Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>
Subject: [PATCH 1/5] selftests/resctrl: Extend signal handler coverage to unmount on receiving signal
Unmounting resctrl FS has been moved into the per test functions in
resctrl_tests.c by commit caddc0fbe495 ("selftests/resctrl: Move
resctrl FS mount/umount to higher level"). In case a signal (SIGINT,
SIGTERM, or SIGHUP) is received, the running selftest is aborted by
ctrlc_handler() which then unmounts resctrl fs before exiting. The
current section between signal_handler_register() and
signal_handler_unregister(), however, does not cover the entire
duration when resctrl FS is mounted.
Move signal_handler_register() and signal_handler_unregister() call
into the test functions in resctrl_tests.c to properly unmount resctrl
fs. Adjust child process kill() call in ctrlc_handler() to only be
invoked if the child was already forked.
Fixes: caddc0fbe495 ("selftests/resctrl: Move resctrl FS mount/umount to higher level")
Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>
Cc: <stable@...r.kernel.org>
---
tools/testing/selftests/resctrl/cat_test.c | 8 -------
.../testing/selftests/resctrl/resctrl_tests.c | 24 +++++++++++++++++++
tools/testing/selftests/resctrl/resctrl_val.c | 22 ++++++++---------
3 files changed, 34 insertions(+), 20 deletions(-)
diff --git a/tools/testing/selftests/resctrl/cat_test.c b/tools/testing/selftests/resctrl/cat_test.c
index 97b87285ab2a..224ba8544d8a 100644
--- a/tools/testing/selftests/resctrl/cat_test.c
+++ b/tools/testing/selftests/resctrl/cat_test.c
@@ -167,12 +167,6 @@ int cat_perf_miss_val(int cpu_no, int n, char *cache_type)
strcpy(param.filename, RESULT_FILE_NAME1);
param.num_of_runs = 0;
param.cpu_no = sibling_cpu_no;
- } else {
- ret = signal_handler_register();
- if (ret) {
- kill(bm_pid, SIGKILL);
- goto out;
- }
}
remove(param.filename);
@@ -209,10 +203,8 @@ int cat_perf_miss_val(int cpu_no, int n, char *cache_type)
}
close(pipefd[0]);
kill(bm_pid, SIGKILL);
- signal_handler_unregister();
}
-out:
cat_test_cleanup();
return ret;
diff --git a/tools/testing/selftests/resctrl/resctrl_tests.c b/tools/testing/selftests/resctrl/resctrl_tests.c
index 823672a20a43..3d66fbdc2df3 100644
--- a/tools/testing/selftests/resctrl/resctrl_tests.c
+++ b/tools/testing/selftests/resctrl/resctrl_tests.c
@@ -73,8 +73,13 @@ static void run_mbm_test(const char * const *benchmark_cmd, int cpu_no)
ksft_print_msg("Starting MBM BW change ...\n");
+ res = signal_handler_register();
+ if (res)
+ return;
+
res = mount_resctrlfs();
if (res) {
+ signal_handler_unregister();
ksft_exit_fail_msg("Failed to mount resctrl FS\n");
return;
}
@@ -91,6 +96,7 @@ static void run_mbm_test(const char * const *benchmark_cmd, int cpu_no)
umount:
umount_resctrlfs();
+ signal_handler_unregister();
}
static void run_mba_test(const char * const *benchmark_cmd, int cpu_no)
@@ -99,8 +105,13 @@ static void run_mba_test(const char * const *benchmark_cmd, int cpu_no)
ksft_print_msg("Starting MBA Schemata change ...\n");
+ res = signal_handler_register();
+ if (res)
+ return;
+
res = mount_resctrlfs();
if (res) {
+ signal_handler_unregister();
ksft_exit_fail_msg("Failed to mount resctrl FS\n");
return;
}
@@ -115,6 +126,7 @@ static void run_mba_test(const char * const *benchmark_cmd, int cpu_no)
umount:
umount_resctrlfs();
+ signal_handler_unregister();
}
static void run_cmt_test(const char * const *benchmark_cmd, int cpu_no)
@@ -123,8 +135,13 @@ static void run_cmt_test(const char * const *benchmark_cmd, int cpu_no)
ksft_print_msg("Starting CMT test ...\n");
+ res = signal_handler_register();
+ if (res)
+ return;
+
res = mount_resctrlfs();
if (res) {
+ signal_handler_unregister();
ksft_exit_fail_msg("Failed to mount resctrl FS\n");
return;
}
@@ -141,6 +158,7 @@ static void run_cmt_test(const char * const *benchmark_cmd, int cpu_no)
umount:
umount_resctrlfs();
+ signal_handler_unregister();
}
static void run_cat_test(int cpu_no, int no_of_bits)
@@ -149,8 +167,13 @@ static void run_cat_test(int cpu_no, int no_of_bits)
ksft_print_msg("Starting CAT test ...\n");
+ res = signal_handler_register();
+ if (res)
+ return;
+
res = mount_resctrlfs();
if (res) {
+ signal_handler_unregister();
ksft_exit_fail_msg("Failed to mount resctrl FS\n");
return;
}
@@ -165,6 +188,7 @@ static void run_cat_test(int cpu_no, int no_of_bits)
umount:
umount_resctrlfs();
+ signal_handler_unregister();
}
int main(int argc, char **argv)
diff --git a/tools/testing/selftests/resctrl/resctrl_val.c b/tools/testing/selftests/resctrl/resctrl_val.c
index 51963a6f2186..a9fe61133119 100644
--- a/tools/testing/selftests/resctrl/resctrl_val.c
+++ b/tools/testing/selftests/resctrl/resctrl_val.c
@@ -468,7 +468,9 @@ pid_t bm_pid, ppid;
void ctrlc_handler(int signum, siginfo_t *info, void *ptr)
{
- kill(bm_pid, SIGKILL);
+ /* Only kill child after bm_pid is set after fork() */
+ if (bm_pid)
+ kill(bm_pid, SIGKILL);
umount_resctrlfs();
tests_cleanup();
ksft_print_msg("Ending\n\n");
@@ -485,6 +487,8 @@ int signal_handler_register(void)
struct sigaction sigact;
int ret = 0;
+ bm_pid = 0;
+
sigact.sa_sigaction = ctrlc_handler;
sigemptyset(&sigact.sa_mask);
sigact.sa_flags = SA_SIGINFO;
@@ -706,10 +710,6 @@ int resctrl_val(const char * const *benchmark_cmd, struct resctrl_val_param *par
ksft_print_msg("Benchmark PID: %d\n", bm_pid);
- ret = signal_handler_register();
- if (ret)
- goto out;
-
/*
* The cast removes constness but nothing mutates benchmark_cmd within
* the context of this process. At the receiving process, it becomes
@@ -721,19 +721,19 @@ int resctrl_val(const char * const *benchmark_cmd, struct resctrl_val_param *par
/* Taskset benchmark to specified cpu */
ret = taskset_benchmark(bm_pid, param->cpu_no);
if (ret)
- goto unregister;
+ goto out;
/* Write benchmark to specified control&monitoring grp in resctrl FS */
ret = write_bm_pid_to_resctrl(bm_pid, param->ctrlgrp, param->mongrp,
resctrl_val);
if (ret)
- goto unregister;
+ goto out;
if (!strncmp(resctrl_val, MBM_STR, sizeof(MBM_STR)) ||
!strncmp(resctrl_val, MBA_STR, sizeof(MBA_STR))) {
ret = initialize_mem_bw_imc();
if (ret)
- goto unregister;
+ goto out;
initialize_mem_bw_resctrl(param->ctrlgrp, param->mongrp,
param->cpu_no, resctrl_val);
@@ -748,7 +748,7 @@ int resctrl_val(const char * const *benchmark_cmd, struct resctrl_val_param *par
sizeof(pipe_message)) {
perror("# failed reading message from child process");
close(pipefd[0]);
- goto unregister;
+ goto out;
}
}
close(pipefd[0]);
@@ -757,7 +757,7 @@ int resctrl_val(const char * const *benchmark_cmd, struct resctrl_val_param *par
if (sigqueue(bm_pid, SIGUSR1, value) == -1) {
perror("# sigqueue SIGUSR1 to child");
ret = errno;
- goto unregister;
+ goto out;
}
/* Give benchmark enough time to fully run */
@@ -786,8 +786,6 @@ int resctrl_val(const char * const *benchmark_cmd, struct resctrl_val_param *par
}
}
-unregister:
- signal_handler_unregister();
out:
kill(bm_pid, SIGKILL);
--
2.30.2
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