[Linux-ia64] Does MCA handler work correctly?

[Linux-ia64] Does MCA handler work correctly?

[j-nomura]

Hello,

does MCA handler of 2.4.18 work correctly on multiple processors?

While looking into mca.c and mca_asm.S, they have single static stack
area for MCA handling, but I could not find synchronization code
between processors.

It seems that when MCA occurs on multiple processors, they may break
stacks each other.

Best regards.
--
NOMURA, Jun'ichi <j-nomura@ce.jp.nec.com, nomura@hpc.bs1.fc.nec.co.jp>
HPC Operating System Group, 1st Computers Software Division,
Computers Software Operations Unit, NEC Solutions.

RE: [Linux-ia64] Does MCA handler work correctly?

[Hall, Jenna S]

Good observation - you are absolutely correct that the current
implementation is not SMP-safe.  The MCA handler is not functional yet -
currently, if you do get an MCA the OS handler will return to SAL with a
request to reboot the machine, and no attempt is made to recover.  (The
logging of hardware-corrected errors is functional, however.)

There is an effort in progress to code the OS recovery for selected MCAs.
This effort is part of the Atlas project:

http://atlas-64.sourceforge.net


Thanks,
Jenna

 -----Original Message-----
From: 	j-nomura@ce.jp.nec.com [mailto:j-nomura@ce.jp.nec.com] 
Sent:	Tuesday, June 11, 2002 5:01 AM
To:	linux-ia64@linuxia64.org
Subject:	[Linux-ia64] Does MCA handler work correctly?

Hello,

does MCA handler of 2.4.18 work correctly on multiple processors?

While looking into mca.c and mca_asm.S, they have single static stack
area for MCA handling, but I could not find synchronization code
between processors.

It seems that when MCA occurs on multiple processors, they may break
stacks each other.

Best regards.
--
NOMURA, Jun'ichi <j-nomura@ce.jp.nec.com, nomura@hpc.bs1.fc.nec.co.jp>
HPC Operating System Group, 1st Computers Software Division,
Computers Software Operations Unit, NEC Solutions.

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