Commit 623b5280 authored by Paul E. McKenney's avatar Paul E. McKenney Committed by Boqun Feng
Browse files

torture: Add get_torture_init_jiffies() for test-start time 



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: default avatarPaul E. McKenney <paulmck@kernel.org>
Signed-off-by: default avatarBoqun Feng <boqun.feng@gmail.com>
parent 2014c95a

include/linux/torture.h

+1 −0
Original line number Diff line number Diff line
@@ -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);

kernel/torture.c

+12 −0
Original line number Diff line number Diff line
@@ -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