LKML Archive on lore.kernel.org
help / color / mirror / Atom feed
From: Zachary Amsden <zach@vmware.com>
To: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Cc: Rusty Russell <rusty@rustcorp.com.au>,
	Pavel Machek <pavel@ucw.cz>, Andi Kleen <ak@muc.de>,
	Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
	Andrew Morton <akpm@osdl.org>,
	Jeremy Fitzhardinge <jeremy@goop.org>,
	Chris Wright <chrisw@sous-sol.org>
Subject: Re: [PATCH 9/11] Panic delay fix
Date: Thu, 08 Feb 2007 13:26:32 -0800	[thread overview]
Message-ID: <45CB9588.50300@vmware.com> (raw)
In-Reply-To: <d120d5000702080643k453e73e3h6d481f9d65a4e856@mail.gmail.com>

Dmitry Torokhov wrote:
>
> However I am not really fond of idea of adding constructs like this
> all over the code:
>
> #define USE_REAL_TIME_DELAY_I_REALLY_MEAN_IT_THIS_TIME_I_SWEAR
>
> as the time passes... Drivers should be blissfully ignorant of being
> run on virtual hardware.

I agree in general, but there are two uses for this ugly construct.  One 
is for drivers and isolated sections of code which actually interact 
with the real world.  They need real time delays.  The only two examples 
so far are SMP coprocessor bootstrapping and blinking LEDs with a 
recognizable frequency.  I don't expect many more to show up.

The other use for this construct is compiling a hardware privileged 
virtual domain that actually drives real hardware - you can just define 
this globally to override any delay masking.

Zach

  reply	other threads:[~2007-02-08 21:26 UTC|newest]

Thread overview: 31+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2007-02-06  3:53 Zachary Amsden
2007-02-06 12:27 ` Andi Kleen
2007-02-06 21:59   ` Zachary Amsden
2007-02-07 12:35     ` Pavel Machek
2007-02-07 20:36       ` Rusty Russell
2007-02-07 22:23         ` Zachary Amsden
2007-02-08 14:43         ` Dmitry Torokhov
2007-02-08 21:26           ` Zachary Amsden [this message]
2007-02-08 21:37             ` Dmitry Torokhov
2007-02-14 12:26         ` Pavel Machek
2007-02-14 19:47           ` Zachary Amsden
2007-02-14 12:52         ` Alan
2007-02-14 20:04           ` Zachary Amsden
2007-02-14 21:34             ` Alan
2007-02-14 21:53               ` Zachary Amsden
2007-02-15  0:33                 ` Alan
2007-02-15 10:17             ` Pavel Machek
2007-02-15 23:42               ` Zachary Amsden
2007-02-15 23:49                 ` Pavel Machek
2007-02-15 23:50                 ` Jeremy Fitzhardinge
2007-02-16  3:22                 ` Rusty Russell
2007-02-07 14:58     ` Dmitry Torokhov
2007-02-07 22:31       ` Zachary Amsden
2007-02-08  8:24         ` Andi Kleen
2007-02-08  9:08           ` Zachary Amsden
2007-02-08 13:33             ` Andi Kleen
2007-02-08 14:41               ` Dmitry Torokhov
2007-02-14 12:49             ` Alan
2007-02-14 22:51 ` Rusty Russell
2007-02-15  0:28   ` Alan
2007-02-15 13:35   ` Dmitry Torokhov

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=45CB9588.50300@vmware.com \
    --to=zach@vmware.com \
    --cc=ak@muc.de \
    --cc=akpm@osdl.org \
    --cc=chrisw@sous-sol.org \
    --cc=dmitry.torokhov@gmail.com \
    --cc=jeremy@goop.org \
    --cc=linux-kernel@vger.kernel.org \
    --cc=pavel@ucw.cz \
    --cc=rusty@rustcorp.com.au \
    --subject='Re: [PATCH 9/11] Panic delay fix' \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link

This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).