linux-kernel - Re: [PATCH] Add a new VT mode which is like VT_PROCESS but doesn't require a VT

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Message-ID: <20100219104616.377927e6@lxorguk.ukuu.org.uk>
Date:	Fri, 19 Feb 2010 10:46:16 +0000
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	atrigent@....neu.edu
Cc:	linux-kernel@...r.kernel.org,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH] Add a new VT mode which is like VT_PROCESS but doesn't
 require a VT_RELDISP ioctl call

> If the X server eventually uses this new mode, debugging and crash
> recovery should become easier. This is because even when currently in
> the VT of a frozen X server it would still be possible to switch out
> by doing SysRq-r and then CTRL-<number of a text vt>, sshing in and
> doing chvt <number of a text vt>, or any other method of VT switching.
> The general concensus on #xorg-devel seems to be that it should be
> safe to use this with X now that we have KMS.
> 
> Signed-off-by: Ari Entlich <atrigent@....neu.edu>

If KMS doesn't need to mode switch then does it need any of this stuff -
can it not just switch to a console and use it ? Otherwise please use a
different value than ACKACQ (just for clarity) and conceptually it looks
fine to me - I just question if it's really needed as KMS based X not
having to play with magic locking stuff would be cleaner still.

Alan
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