diff options
| author | Zihuan Zhang <zhangzihuan@kylinos.cn> | 2025-05-07 14:35:20 +0800 |
|---|---|---|
| committer | Rafael J. Wysocki <rafael.j.wysocki@intel.com> | 2025-05-09 15:59:10 +0200 |
| commit | 50c9bb30dc1f9731995a191deafbc49be717053e (patch) | |
| tree | b4e0ff43801cf9516005b342e76a6472699da71d | |
| parent | f0050a3e214aa941b78ad4caf122a735a24d81a6 (diff) | |
PM: hibernate: add configurable delay for pm_test
Turn the default 5 second test delay for hibernation into a
configurable module parameter, so users can determine how
long to wait in this pseudo-hibernate state before resuming
the system.
The configurable delay parameter has been added for suspend, so
add an analogous one for hibernation.
Example (wait 30 seconds);
# echo 30 > /sys/module/hibernate/parameters/pm_test_delay
# echo core > /sys/power/pm_test
Signed-off-by: Zihuan Zhang <zhangzihuan@kylinos.cn>
Reviewed-by: Randy Dunlap <rdunlap@infradead.org>
Link: https://patch.msgid.link/20250507063520.419635-1-zhangzihuan@kylinos.cn
[ rjw: Subject and changelog edits ]
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
| -rw-r--r-- | Documentation/admin-guide/kernel-parameters.txt | 7 | ||||
| -rw-r--r-- | kernel/power/hibernate.c | 9 |
2 files changed, 14 insertions, 2 deletions
diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt index 76e538c77e31..ccd61e22403f 100644 --- a/Documentation/admin-guide/kernel-parameters.txt +++ b/Documentation/admin-guide/kernel-parameters.txt @@ -1831,6 +1831,13 @@ lz4: Select LZ4 compression algorithm to compress/decompress hibernation image. + hibernate.pm_test_delay= + [HIBERNATION] + Sets the number of seconds to remain in a hibernation test + mode before resuming the system (see + /sys/power/pm_test). Only available when CONFIG_PM_DEBUG + is set. Default value is 5. + highmem=nn[KMG] [KNL,BOOT,EARLY] forces the highmem zone to have an exact size of <nn>. This works even on boxes that have no highmem otherwise. This also works to reduce highmem diff --git a/kernel/power/hibernate.c b/kernel/power/hibernate.c index f0db9d1896e8..f4db2e82fd87 100644 --- a/kernel/power/hibernate.c +++ b/kernel/power/hibernate.c @@ -133,10 +133,15 @@ bool system_entering_hibernation(void) EXPORT_SYMBOL(system_entering_hibernation); #ifdef CONFIG_PM_DEBUG +static unsigned int pm_test_delay = 5; +module_param(pm_test_delay, uint, 0644); +MODULE_PARM_DESC(pm_test_delay, + "Number of seconds to wait before resuming from hibernation test"); static void hibernation_debug_sleep(void) { - pr_info("debug: Waiting for 5 seconds.\n"); - mdelay(5000); + pr_info("hibernation debug: Waiting for %d second(s).\n", + pm_test_delay); + mdelay(pm_test_delay * 1000); } static int hibernation_test(int level) |