Re: Hibernation Redesign

From: Miklos Szeredi <miklos@xxxxxxxxxx>
Date: Wed, 11 Jul 2007 14:09:39 +0200

Freezing of tasks is slowing down suspend. Don't know how serious
this is, suspend is pretty fast, but could possibly be even faster.

It's FUD. Freezing of tasks normally takes next to no time. I've never
understood the rediculously long timeout it has. If freezing succeeds, all
processes are frozen within 1/2 a second tops. If it fails, nothing is going
to change in the following 19.5 seconds (or whatever it is if I don't
remember the value properly).

Right. The 20s timeout is again a sign of brokenness.

If we expect something to fail, it should fail immediately, without
waiting for arbitrary timeouts.

And if we don't expect it to fail, why the timeout?

Of course we know it can fail (network problems, etc), so it's wrong
whatever way we look at it.

Miklos
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Follow-Ups:
- Re: Hibernation Redesign
  - From: Pavel Machek
- Re: Hibernation Redesign
  - From: Rafael J. Wysocki
- Re: Hibernation Redesign
  - From: Nigel Cunningham

References:
- Hibernation Redesign (was: malicious filesystems (was Re: [linux-pm] Re: [PATCH] Remove process freezer from suspend to RAM)
  - From: Al Boldi
- Re: Hibernation Redesign
  - From: Rafael J. Wysocki
- Re: Hibernation Redesign
  - From: Miklos Szeredi
- Re: Hibernation Redesign
  - From: Nigel Cunningham

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Relevant Pages

Re: Hibernation Redesign
... Freezing of tasks normally takes next to no time. ... The 20s timeout is again a sign of brokenness. ... If we expect something to fail, it should fail immediately, without ...
(Linux-Kernel)
Re: Hibernation Redesign
... this is, suspend is pretty fast, but could possibly be even faster. ... Freezing of tasks normally takes next to no time. ... The 20s timeout is again a sign of brokenness. ... We know that it can fail, so we use the timeout to detect failures. ...
(Linux-Kernel)
Re: Hibernation Redesign
... It's FUD. ... Freezing of tasks normally takes next to no time. ... The 20s timeout is again a sign of brokenness. ... We know that it can fail, so we use the timeout to detect failures. ...
(Linux-Kernel)
Re: Hibernation Redesign
... this is, suspend is pretty fast, but could possibly be even faster. ... Freezing of tasks normally takes next to no time. ... The 20s timeout is again a sign of brokenness. ... We know that it can fail, so we use the timeout to detect failures. ...
(Linux-Kernel)
Re: Hibernation Redesign
... this is, suspend is pretty fast, but could possibly be even faster. ... It's FUD. ... Freezing of tasks normally takes next to no time. ... The 20s timeout is again a sign of brokenness. ...
(Linux-Kernel)