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| author | Len Brown <len.brown@intel.com> | 2015-07-31 18:46:17 +0200 |
|---|---|---|
| committer | Rafael J. Wysocki <rafael.j.wysocki@intel.com> | 2015-07-31 23:46:05 +0200 |
| commit | 2fd77fff4b440c29b48c31db0ce2aec7d319959f (patch) | |
| tree | fe1c131b86a1cefe66e2ed2b7641b8c8db78c757 /kernel/power/suspend.c | |
| parent | PM / sleep: Allow devices without runtime PM to do direct-complete (diff) | |
| download | linux-2fd77fff4b440c29b48c31db0ce2aec7d319959f.tar.xz linux-2fd77fff4b440c29b48c31db0ce2aec7d319959f.zip | |
PM / suspend: make sync() on suspend-to-RAM build-time optional
The Linux kernel suspend path has traditionally invoked sys_sync()
before freezing user threads.
But sys_sync() can be expensive, and some user-space OS's do not want
the kernel to pay the cost of sys_sync() on every suspend -- preferring
invoke sync() from user-space if/when they want it.
So make sys_sync on suspend build-time optional.
The default is unchanged.
Signed-off-by: Len Brown <len.brown@intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Diffstat (limited to 'kernel/power/suspend.c')
| -rw-r--r-- | kernel/power/suspend.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/kernel/power/suspend.c b/kernel/power/suspend.c index 53266b729fd9..7e4cda4a8dd9 100644 --- a/kernel/power/suspend.c +++ b/kernel/power/suspend.c @@ -484,11 +484,13 @@ static int enter_state(suspend_state_t state) if (state == PM_SUSPEND_FREEZE) freeze_begin(); +#ifndef CONFIG_SUSPEND_SKIP_SYNC trace_suspend_resume(TPS("sync_filesystems"), 0, true); printk(KERN_INFO "PM: Syncing filesystems ... "); sys_sync(); printk("done.\n"); trace_suspend_resume(TPS("sync_filesystems"), 0, false); +#endif pr_debug("PM: Preparing system for sleep (%s)\n", pm_states[state]); error = suspend_prepare(state); |