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torture: Throttle VERBOSE_TOROUT_*() output

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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: Paul E. McKenney <paulmck@kernel.org>
This commit is contained in:
Paul E. McKenney 2020-11-25 13:00:04 -08:00
parent 414c116e01
commit 8a67a20bf2
3 changed files with 41 additions and 2 deletions
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8
Documentation/admin-guide/kernel-parameters.txt
View File

@ -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]

15
include/linux/torture.h
View File

@ -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);

20
kernel/torture.c
View File

@ -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