Commit 8a67a20b authored by Paul E. McKenney's avatar Paul E. McKenney
Browse files

torture: Throttle VERBOSE_TOROUT_*() output 



This commit adds kernel boot parameters torture.verbose_sleep_frequency
and torture.verbose_sleep_duration, which allow VERBOSE_TOROUT_*() output
to be throttled with periodic sleeps on large systems.

Signed-off-by: default avatarPaul E. McKenney <paulmck@kernel.org>
parent 414c116e

Documentation/admin-guide/kernel-parameters.txt

+8 −0
Original line number Diff line number Diff line
@@ -5337,6 +5337,14 @@ 
			are running concurrently, especially on systems

			with rotating-rust storage.



	torture.verbose_sleep_frequency= [KNL]

			Specifies how many verbose printk()s should be

			emitted between each sleep.  The default of zero

			disables verbose-printk() sleeping.



	torture.verbose_sleep_duration= [KNL]

			Duration of each verbose-printk() sleep in jiffies.



	tp720=		[HW,PS2]



	tpm_suspend_pcr=[HW,TPM]

include/linux/torture.h

+13 −2
Original line number Diff line number Diff line
@@ -32,9 +32,20 @@ 
#define TOROUT_STRING(s) \

	pr_alert("%s" TORTURE_FLAG " %s\n", torture_type, s)

#define VERBOSE_TOROUT_STRING(s) \

	do { if (verbose) pr_alert("%s" TORTURE_FLAG " %s\n", torture_type, s); } while (0)

do {										\

	if (verbose) {								\

		verbose_torout_sleep();						\

		pr_alert("%s" TORTURE_FLAG " %s\n", torture_type, s);		\

	}									\

} while (0)

#define VERBOSE_TOROUT_ERRSTRING(s) \

	do { if (verbose) pr_alert("%s" TORTURE_FLAG "!!! %s\n", torture_type, s); } while (0)

do {										\

	if (verbose) {								\

		verbose_torout_sleep();						\

		pr_alert("%s" TORTURE_FLAG "!!! %s\n", torture_type, s);	\

	}									\

} while (0)

void verbose_torout_sleep(void);



/* Definitions for online/offline exerciser. */

typedef void torture_ofl_func(void);

kernel/torture.c

+20 −0
Original line number Diff line number Diff line
@@ -48,6 +48,12 @@ module_param(disable_onoff_at_boot, bool, 0444); 
static bool ftrace_dump_at_shutdown;

module_param(ftrace_dump_at_shutdown, bool, 0444);



static int verbose_sleep_frequency;

module_param(verbose_sleep_frequency, int, 0444);



static int verbose_sleep_duration = 1;

module_param(verbose_sleep_duration, int, 0444);



static char *torture_type;

static int verbose;
@@ -58,6 +64,20 @@ static int verbose; 
static int fullstop = FULLSTOP_RMMOD;

static DEFINE_MUTEX(fullstop_mutex);



static atomic_t verbose_sleep_counter;



/*

 * Sleep if needed from VERBOSE_TOROUT*().

 */

void verbose_torout_sleep(void)

{

	if (verbose_sleep_frequency > 0 &&

	    verbose_sleep_duration > 0 &&

	    !(atomic_inc_return(&verbose_sleep_counter) % verbose_sleep_frequency))

		schedule_timeout_uninterruptible(verbose_sleep_duration);

}

EXPORT_SYMBOL_GPL(verbose_torout_sleep);



/*

 * Schedule a high-resolution-timer sleep in nanoseconds, with a 32-bit

 * nanosecond random fuzz.  This function and its friends desynchronize