Linux kernel crash dumps (LKCD) and PowerPC ports.

Linux kernel crash dumps (LKCD) and PowerPC ports.

[Arun Dharankar]

Greetings.

>From what I able to find from some searching around, the implementation
by MCLX ("http://oss.missioncriticallinux.com/projects/mcore/") is being
carried on at http://lists.insecure.org/lists/linux-kernel/2003/Feb/0987.html.

Looking at these patches, I can only see x86 architecture support for
in memory kernel crash dump support. Is anyone actively working on the
PowerPC architecture?

Best regards,
-Arun.

Re: Linux kernel crash dumps (LKCD) and PowerPC ports.

[Matt D. Robinson]

Please look at the lkcd-devel mailing archives.  There is
at least one group working on a PPC port of LKCD

	http://sourceforge.net/mail/?group_id=2726

--Matt
	
On Tue, 2003-04-08 at 13:47, Arun Dharankar wrote:
> Greetings.
> 
> >From what I able to find from some searching around, the implementation
> by MCLX ("http://oss.missioncriticallinux.com/projects/mcore/") is being
> carried on at http://lists.insecure.org/lists/linux-kernel/2003/Feb/0987.html.
> 
> Looking at these patches, I can only see x86 architecture support for
> in memory kernel crash dump support. Is anyone actively working on the
> PowerPC architecture?
> 
> Best regards,
> -Arun.
> 
> 
> 
> -
> To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
> the body of a message to majordomo@vger.kernel.org
> More majordomo info at  http://vger.kernel.org/majordomo-info.html
> Please read the FAQ at  http://www.tux.org/lkml/
> 

Re: Linux kernel crash dumps (LKCD) and PowerPC ports.

[Arun Dharankar]

Matt, thanks for the pointers!

Looking at those sites, it appears that the development at
"http://lists.insecure.org/lists/linux-kernel/2003/Feb/0987.html."
which I had pointed is based on the SGI's dump scheme. Same
for the one you pointed to.

The other scheme I poinited to (from Mission Critical Linux/MCLX)
seems to have some strong points too. Any pointers to discussions
about why the LKCD work seems to more active than the
MCLX one?

Best regards,
-Arun.


On Tuesday 08 April 2003 07:14 pm, Matt D. Robinson wrote:
> Please look at the lkcd-devel mailing archives.  There is
> at least one group working on a PPC port of LKCD
>
> 	http://sourceforge.net/mail/?group_id=2726
>
> --Matt
>
> On Tue, 2003-04-08 at 13:47, Arun Dharankar wrote:
> > Greetings.
> >
> > >From what I able to find from some searching around, the implementation
> >
> > by MCLX ("http://oss.missioncriticallinux.com/projects/mcore/") is being
> > carried on at
> > http://lists.insecure.org/lists/linux-kernel/2003/Feb/0987.html.
> >
> > Looking at these patches, I can only see x86 architecture support for
> > in memory kernel crash dump support. Is anyone actively working on the
> > PowerPC architecture?
> >
> > Best regards,
> > -Arun.

Re: Linux kernel crash dumps (LKCD) and PowerPC ports.

[Piet Delaney]

On Tue, 2003-04-08 at 20:49, Arun Dharankar wrote:
> Matt, thanks for the pointers!
> 
> Looking at those sites, it appears that the development at
> "http://lists.insecure.org/lists/linux-kernel/2003/Feb/0987.html."
> which I had pointed is based on the SGI's dump scheme. Same
> for the one you pointed to.
> 
> The other scheme I poinited to (from Mission Critical Linux/MCLX)
> seems to have some strong points too. Any pointers to discussions
> about why the LKCD work seems to more active than the
> MCLX one?

I don't think there has been such a discussion. The Mission Critical
hackers were hired by RedHat and Dave Anderson continues to work on
crash and making it available at:

	ftp://people.redhat.com/anderson

He's had about a release per month. I thought MCLX crash has some
strong points also. After I enhanced LKCD to support the ia64 I
fixed MCLX crash so it could read the new LKCD crash dumps which
are no longer monotonically increasing in memory. I did this to
support NUMA systems which can have more memory than swap space.
This way the most important memory can be saved first. 

If you read the lkcd-devel mailing list you can read our discussion
on maintaining MLCX crash on the lkcd cvs tree. 


	"And imnsho, debugging the kernel on a source 
	 level is the way to do it."
					Linus
					
-piet
	
> 
> Best regards,
> -Arun.
> 
> 
> On Tuesday 08 April 2003 07:14 pm, Matt D. Robinson wrote:
> > Please look at the lkcd-devel mailing archives.  There is
> > at least one group working on a PPC port of LKCD
> >
> > 	http://sourceforge.net/mail/?group_id=2726
> >
> > --Matt
> >
> > On Tue, 2003-04-08 at 13:47, Arun Dharankar wrote:
> > > Greetings.
> > >
> > > >From what I able to find from some searching around, the implementation
> > >
> > > by MCLX ("http://oss.missioncriticallinux.com/projects/mcore/") is being
> > > carried on at
> > > http://lists.insecure.org/lists/linux-kernel/2003/Feb/0987.html.
> > >
> > > Looking at these patches, I can only see x86 architecture support for
> > > in memory kernel crash dump support. Is anyone actively working on the
> > > PowerPC architecture?
> > >
> > > Best regards,
> > > -Arun.
> -
> To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
> the body of a message to majordomo@vger.kernel.org
> More majordomo info at  http://vger.kernel.org/majordomo-info.html
> Please read the FAQ at  http://www.tux.org/lkml/
-- 
piet@www.piet.net

Re: Linux kernel crash dumps (LKCD) and PowerPC ports.

[Arun Dharankar]

Piet, thanks for the reply!

Some of the points that I found attractive (among other points):

  - Overall a smaller time to reboot and save the dump, and bring the
    system back to working state.
  - Does not require local disk to save the dump on the way down during
    a panic - works on a diskless system.
  - No need for a dump/swap device.


Looking at the MCLX site, the last patch is on 2.4.17 only. Also, the
PowerPC port is a bit broken. Is anyone maintaining this part of the
MCLX scheme, and is available else where?


Best regards,
-Arun.


> > Looking at those sites, it appears that the development at
> > "http://lists.insecure.org/lists/linux-kernel/2003/Feb/0987.html."
> > which I had pointed is based on the SGI's dump scheme. Same
> > for the one you pointed to.
> >
> > The other scheme I poinited to (from Mission Critical Linux/MCLX)
> > seems to have some strong points too. Any pointers to discussions
> > about why the LKCD work seems to more active than the
> > MCLX one?
>
> I don't think there has been such a discussion. The Mission Critical
> hackers were hired by RedHat and Dave Anderson continues to work on
> crash and making it available at:
>
> 	ftp://people.redhat.com/anderson
>
> He's had about a release per month. I thought MCLX crash has some
> strong points also. After I enhanced LKCD to support the ia64 I
> fixed MCLX crash so it could read the new LKCD crash dumps which
> are no longer monotonically increasing in memory. I did this to
> support NUMA systems which can have more memory than swap space.
> This way the most important memory can be saved first.
>
> If you read the lkcd-devel mailing list you can read our discussion
> on maintaining MLCX crash on the lkcd cvs tree.
>
>
> 	"And imnsho, debugging the kernel on a source
> 	 level is the way to do it."
> 					Linus
>
> -piet
>
> > Best regards,
> > -Arun.
> >
> > On Tuesday 08 April 2003 07:14 pm, Matt D. Robinson wrote:
> > > Please look at the lkcd-devel mailing archives.  There is
> > > at least one group working on a PPC port of LKCD
> > >
> > > 	http://sourceforge.net/mail/?group_id=2726
> > >
> > > --Matt