On Tue 2015-07-14 22:24:51, Len Brown wrote:
> From: Len Brown <len.br...@intel.com>
>
> The Linux kernel suspend path has traditionally invoked sys_sync().
>
> But sys_sync() can be expensive, and some systems do not want
> to pay the cost of sys_sync() on every suspend.
Have you measured how expesive it can be, and why it is expensive?
> So make sys_sync on suspend optional.
>
> Create sysfs attribute /sys/power/pm_suspend_do_sync.
> When set to 1, the kernel will sys_sync() on suspend,
> When set to 0, it will not.
>
> This attribute can be changed by root at run-time.
> Kernel build parameter CONFIG_PM_SUSPEND_DO_SYNC_DEFAULT.
> As this is 1, by default, this patch does not change
> default behavior.
Why do you need CONFIG parameter?
Pavel
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