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Groups > linux.kernel > #1184353
| From | Pavel Machek <pavel@ucw.cz> |
|---|---|
| Newsgroups | linux.kernel |
| Subject | Re: [PATCH 1/1] suspend: make sync() on suspend-to-RAM optional |
| Date | 2015-07-15 08:50 +0200 |
| Message-ID | <pMoFX-83L-13@gated-at.bofh.it> (permalink) |
| References | <pMkCm-2kr-5@gated-at.bofh.it> <pMkCm-2kr-7@gated-at.bofh.it> |
| Organization | linux.* mail to news gateway |
On Tue 2015-07-14 22:24:51, Len Brown wrote: > From: Len Brown <len.brown@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 -- (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 majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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[PATCH v4 0/1] suspend: make sync() on suspend-to-RAM optional Len Brown <lenb@kernel.org> - 2015-07-15 04:30 +0200
[PATCH 1/1] suspend: make sync() on suspend-to-RAM optional Len Brown <lenb@kernel.org> - 2015-07-15 04:30 +0200
Re: [PATCH 1/1] suspend: make sync() on suspend-to-RAM optional Pavel Machek <pavel@ucw.cz> - 2015-07-15 08:50 +0200
Re: [PATCH 1/1] suspend: make sync() on suspend-to-RAM optional Austin S Hemmelgarn <ahferroin7@gmail.com> - 2015-07-15 16:10 +0200
RE: [PATCH 1/1] suspend: make sync() on suspend-to-RAM optional "Brown, Len" <len.brown@intel.com> - 2015-07-15 17:00 +0200
Re: [PATCH 1/1] suspend: make sync() on suspend-to-RAM optional Pavel Machek <pavel@ucw.cz> - 2015-07-22 09:30 +0200
Re: [PATCH 1/1] suspend: make sync() on suspend-to-RAM optional Oliver Neukum <oneukum@suse.com> - 2015-07-22 11:00 +0200
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