Messages in this thread | | | From | Chen Yu <> | Subject | Re: [PATCH] PM / hibernate: Introduce snapshot test mode for hibernation | Date | Wed, 13 Jul 2016 18:20:05 +0800 |
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Hi Pavel, thanks for your reply,
On 2016年07月13日 17:50, Pavel Machek wrote: > On Thu 2016-07-07 14:40:58, Chen Yu wrote: >> This mode is to verify if the snapshot data written to >> swap device can be successfully restored to memory. It >> is useful to ease the debugging process on hibernation, >> since this mode can not only bypass the BIOSen/bootloader, >> but also the system re-initialization. >> >> For example: >> $ sudo echo snapshot > /sys/power/disk >> $ sudo echo disk > /sys/power/state >> >> /* manual resume.*/ >> $ sudo echo 8:3 > /sys/power/resume > Your examples will not work, will they? It works on my platform, although I did not tested it for too many rounds. And here's a revised version of v2, which introduced a new test mode in pm_test, thus users do not need to run a manual resume. https://patchwork.kernel.org/patch/9226837/ > > This is also quite tricky/dangerous. If you do this with filesystems > mounted R/W, it is "good bye, filesystems". Ah, yes, this is quite tricky, maybe we can use this option as a debug method, for example, boot with rootfs = initrd, without mounting any disks, and then swapon the swap device, and do a testing. This should be safer? > > I guess updating documentation would be welcome from my side, > otherwise it should be ok. OK, I'll update the documents. > > Acked-by: Pavel Machek <pavel@ucw.cz> thanks. > > Best regards, > Pavel >
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