On Tue 2015-07-14 22:24:51, Len Brown wrote:
> From: Len Brown <[email protected]>
>
> 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
--
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures)
http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to [email protected]
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
