[lkml]   [2001]   [Oct]   [24]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
Messages in this thread
SubjectRe: [RFC] New Driver Model for 2.5
On Wed, Oct 24, 2001 at 09:19:45AM -0700, Linus Torvalds wrote:

> On Wed, 24 Oct 2001, Alan Cox wrote:

> > Assuming you want to synchronize the raid before suspend - a reasonably
> > policy but not essential then you'd have to shut down the raid before
> > sd, then sd would let the devices shut down which lets the controller
> > shutdown

> I will _refuse_ to have a kernel suspend that synchronizes the raid etc.
> That would make suspend/resume potentially take a _loong_ time.

If you have Magic SysRq enabled, would that do the job prior
to suspend? Typically with Pavel's swsusp package, I hit the Alt-SysRq-s
before hitting Alt-SysRq-d to suspend him. Does Alt-SysRq-s synchronize
a raid? Of course, at that point, the choice to take the "_loong_ time"
is in user space - meat space, user space - since I chose to hit that
key combination.

> If you want to synchronize your raid thing, make the user-level thing that
> triggers the suspend do it. Same goes for things like "sync network
> filesystems" etc. This is not a kernel level issue, and the kernel
> shouldn't even try to do it.

What does the Alt-SysRq-s combination do about networks then?

> If somebody has pending stuff over NFS and suspends, and when it comes
> back it's not on the network any more, that is 100% equivalent to removing
> a PCMCIA network card while running. It's supposed to work - but if you
> lose data that's YOUR problem, not the kernels.

> Linus

Michael H. Warfield | (770) 985-6132 |
/\/\|=mhw=|\/\/ | (678) 463-0932 |
NIC whois: MHW9 | An optimist believes we live in the best of all
PGP Key: 0xDF1DD471 | possible worlds. A pessimist is sure of it!

To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to
More majordomo info at
Please read the FAQ at

 \ /
  Last update: 2005-03-22 13:10    [W:0.087 / U:3.024 seconds]
©2003-2018 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site