diff options
| author | Stefan Guendhoer <stefan@guendhoer.com> | 2016-01-07 22:23:23 +0000 |
|---|---|---|
| committer | Moyster <oysterized@gmail.com> | 2016-08-26 20:20:31 +0200 |
| commit | e68ce258c35d28b497cdb11e1e5e9949f660d1ed (patch) | |
| tree | 3ce2bc9414c9a0a89f43751a4fecd25b7f47535f /kernel | |
| parent | 70321f3dc4559805113d383559197560b8d4cefa (diff) | |
power: make sync on suspend optional
propagate from (CR).
On embedded devices with built-in batteries, it is not so
important to sync the file systems before suspend. The chance
of losing power during suspend are no greater than they are
when the system is awake. The sync operations can greatly
increase suspend latency when the system has accrued many dirty
pages and/or the target storage devices are not particularly
fast.
This commit adds a kernel config option to allow file system
sync in the suspend path to be disabled.
It is enabled by default.
Diffstat (limited to 'kernel')
| -rw-r--r-- | kernel/power/Kconfig | 5 | ||||
| -rw-r--r-- | kernel/power/suspend.c | 2 |
2 files changed, 7 insertions, 0 deletions
diff --git a/kernel/power/Kconfig b/kernel/power/Kconfig index c7638ed4c..9f0468d66 100644 --- a/kernel/power/Kconfig +++ b/kernel/power/Kconfig @@ -604,3 +604,8 @@ config SUSPEND_TIME Prints the time spent in suspend in the kernel log, and keeps statistics on the time spent in suspend in /sys/kernel/debug/suspend_time + +config PM_SYNC_BEFORE_SUSPEND + bool "Sync file systems before suspend" + depends on PM + default y diff --git a/kernel/power/suspend.c b/kernel/power/suspend.c index e39ebe80a..aab3d642b 100644 --- a/kernel/power/suspend.c +++ b/kernel/power/suspend.c @@ -401,6 +401,7 @@ int enter_state(suspend_state_t state) if (state == PM_SUSPEND_FREEZE) freeze_begin(); +#ifdef CONFIG_PM_SYNC_BEFORE_SUSPEND printk(KERN_INFO "PM: Syncing filesystems ... "); #if MTK_SOLUTION error = suspend_syssync_enqueue(); @@ -412,6 +413,7 @@ int enter_state(suspend_state_t state) sys_sync(); #endif printk("done.\n"); +#endif pr_debug("PM: Preparing system for %s sleep\n", pm_states[state].label); error = suspend_prepare(state); |