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SubjectRe: [PATCH] perf, x86: Disable perf if the BIOS got its grubby paws on the PMU
> > > On 9/3/2010 2:13 AM, Peter Zijlstra wrote:
> > > >+static void print_BIOS_fail(void)
> > > >+{
> > > >+ printk(KERN_ERR "\n");
> > > >+ printk(KERN_ERR "=============================================\n");
> > > >+ printk(KERN_ERR "It appears the BIOS is actively using the PMU\n");
> > > >+ printk(KERN_ERR "this avoids Linux from using it, please de- \n");
> > > >+ printk(KERN_ERR "activate this BIOS feature or request a BIOS \n");
> > > >+ printk(KERN_ERR "update from your vendor. \n");
> > > >+ printk(KERN_ERR "=============================================\n");

I would rather prefer this:

BIOS bug, cpu 1, invalid <register=value> ...

... which is a much better information on one line, explains the bug
and is also better parsable. I intend to implement messages like
this. So maybe we could find consensus with this or something similar.

A simple grep of dmesg will then give a list of BIOS bugs.

-Robert

--
Advanced Micro Devices, Inc.
Operating System Research Center



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