Re: [PATCH 0/3] PM, vfs: use filesystem freezing instead of kthread freezer
From: Alan Stern
Date: Fri Oct 30 2015 - 16:41:43 EST
On Fri, 30 Oct 2015, Jiri Kosina wrote:
> On Fri, 30 Oct 2015, Pavel Machek wrote:
>
> > > I would say instead "no I/O is allowed from now on". Maybe that's an
> > > overstatement, but I think it comes closer to the truth.
>
> But that's what PM callbacks are for.
Why are PM callbacks any more suitable than the freezer? The most
natural implementation would be for the callback routine to set a flag;
at various strategic points the kthread would check the flag and if it
was set, call a routine that sits around and waits for the suspend to
be over. How does that differ from using the freezer, apart from being
more cumbersome and involving more code?
Also, you never replied to my question about suspend vs. hibernation.
Alan Stern
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