This commit adds a get_torture_init_jiffies() function that returns the
value of the jiffies counter at the start of the test, that is, at the
point where torture_init_begin() was invoked.
This will be used to enable torture-test holdoffs for tests implemented
using per-CPU kthreads, which are created and deleted by CPU-hotplug
operations, and thus (unlike normal kthreads) don't automatically know
when the test started.
Signed-off-by: Paul E. McKenney <paulmck@xxxxxxxxxx>
---
include/linux/torture.h | 1 +
kernel/torture.c | 12 ++++++++++++
2 files changed, 13 insertions(+)
diff --git a/include/linux/torture.h b/include/linux/torture.h
index 0134e7221cae6..1b59056c3b182 100644
--- a/include/linux/torture.h
+++ b/include/linux/torture.h
@@ -104,6 +104,7 @@ int torture_stutter_init(int s, int sgap);
/* Initialization and cleanup. */
bool torture_init_begin(char *ttype, int v);
void torture_init_end(void);
+unsigned long get_torture_init_jiffies(void);
bool torture_cleanup_begin(void);
void torture_cleanup_end(void);
bool torture_must_stop(void);
diff --git a/kernel/torture.c b/kernel/torture.c
index dede150aef011..3a0a8cc604010 100644
--- a/kernel/torture.c
+++ b/kernel/torture.c
@@ -792,6 +792,8 @@ static void torture_stutter_cleanup(void)
stutter_task = NULL;
}
+static unsigned long torture_init_jiffies;
+
static void
torture_print_module_parms(void)
{
@@ -821,6 +823,7 @@ bool torture_init_begin(char *ttype, int v)
torture_type = ttype;
verbose = v;
fullstop = FULLSTOP_DONTSTOP;
+ WRITE_ONCE(torture_init_jiffies, jiffies); // Lockless reads.
torture_print_module_parms();
return true;
}
@@ -836,6 +839,15 @@ void torture_init_end(void)
}
EXPORT_SYMBOL_GPL(torture_init_end);
+/*
+ * Get the torture_init_begin()-time value of the jiffies counter.
+ */
+unsigned long get_torture_init_jiffies(void)
+{
+ return READ_ONCE(torture_init_jiffies);
+}
+EXPORT_SYMBOL_GPL(get_torture_init_jiffies);
+
/*
* Clean up torture module. Please note that this is -not- invoked via
* the usual module_exit() mechanism, but rather by an explicit call from
--
2.40.1
