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torture: Dump ftrace at shutdown only if requested

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If there is a large number of torture tests running concurrently,
all of which are dumping large ftrace buffers at shutdown time, the
resulting dumping can take a very long time, particularly on systems
with rotating-rust storage.  This commit therefore adds a default-off
torture.ftrace_dump_at_shutdown module parameter that enables
shutdown-time ftrace-buffer dumping.

Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
This commit is contained in:
Paul E. McKenney 2020-06-16 15:38:24 -07:00
parent 06efa9b4b2
commit 2102ad290a
2 changed files with 12 additions and 1 deletions
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7
Documentation/admin-guide/kernel-parameters.txt
View File

@ -5096,6 +5096,13 @@
Prevent the CPU-hotplug component of torturing
until after init has spawned.
torture.ftrace_dump_at_shutdown= [KNL]
Dump the ftrace buffer at torture-test shutdown,
even if there were no errors. This can be a
very costly operation when many torture tests
are running concurrently, especially on systems
with rotating-rust storage.
tp720= [HW,PS2]
tpm_suspend_pcr=[HW,TPM]

6
kernel/torture.c
View File

@ -45,6 +45,9 @@ MODULE_AUTHOR("Paul E. McKenney <paulmck@linux.ibm.com>");
static bool disable_onoff_at_boot;
module_param(disable_onoff_at_boot, bool, 0444);
static bool ftrace_dump_at_shutdown;
module_param(ftrace_dump_at_shutdown, bool, 0444);
static char *torture_type;
static int verbose;
@ -527,7 +530,8 @@ static int torture_shutdown(void *arg)
torture_shutdown_hook();
else
VERBOSE_TOROUT_STRING("No torture_shutdown_hook(), skipping.");
rcu_ftrace_dump(DUMP_ALL);
if (ftrace_dump_at_shutdown)
rcu_ftrace_dump(DUMP_ALL);
kernel_power_off(); /* Shut down the system. */
return 0;
}