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torture: Add get_torture_init_jiffies() for test-start time

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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@kernel.org>
Signed-off-by: Boqun Feng <boqun.feng@gmail.com>
This commit is contained in:
Paul E. McKenney 2024-11-13 14:57:51 -08:00 committed by Boqun Feng
parent 2014c95afe
commit 623b52802b
2 changed files with 13 additions and 0 deletions
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1
include/linux/torture.h
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@ -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);

12
kernel/torture.c
View File

@ -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