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Message-Id: <20250507063520.419635-1-zhangzihuan@kylinos.cn>
Date: Wed, 7 May 2025 14:35:20 +0800
From: Zihuan Zhang <zhangzihuan@...inos.cn>
To: corbet@....net,
rafael@...nel.org,
len.brown@...el.com,
pavel@...nel.org,
akpm@...ux-foundation.org,
paulmck@...nel.org,
rostedt@...dmis.org,
thuth@...hat.com,
bp@...en8.de,
ardb@...nel.org,
gregkh@...uxfoundation.org
Cc: linux-doc@...r.kernel.org,
linux-kernel@...r.kernel.org,
linux-pm@...r.kernel.org,
Zihuan Zhang <zhangzihuan@...inos.cn>
Subject: [PATCH v3] PM / sleep: add configurable delay for pm_test
This patch turns this 5 second delay 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 to suspend and
synchronized to 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@...inos.cn>
---
v3:
- Fix the location of the hibernate.pm_test_delay parameter in
kernel-parameters.txt.
- Update ‘[hibernate]’ to ‘[HIBERNATION]’
v2:
- Fix typos.
---
Documentation/admin-guide/kernel-parameters.txt | 7 +++++++
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 d9fd26b95b34..a110cbb37f20 100644
--- a/Documentation/admin-guide/kernel-parameters.txt
+++ b/Documentation/admin-guide/kernel-parameters.txt
@@ -1828,6 +1828,13 @@
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 23c0f4e6cb2f..485133af884d 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)
--
2.25.1
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