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SubjectRe: [PATCH RFC v3 4/4] Documentation/admin-guide: Change doc for split_lock_detect parameter
Hi, Randy,

On Fri, Oct 30, 2020 at 08:14:15PM -0700, Randy Dunlap wrote:
> On 10/30/20 5:27 PM, Fenghua Yu wrote:
> > diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt
> > index 526d65d8573a..ee419ce659f5 100644
> > --- a/Documentation/admin-guide/kernel-parameters.txt
> > +++ b/Documentation/admin-guide/kernel-parameters.txt
> > @@ -5044,27 +5044,45 @@
> > spia_peddr=
> >
> > split_lock_detect=
> > - [X86] Enable split lock detection
> > + [X86] Enable split lock detection or bus lock detection
> >
> > When enabled (and if hardware support is present), atomic
> > instructions that access data across cache line
> > - boundaries will result in an alignment check exception.
> > + boundaries will result in an alignment check exception
> > + for split lock detection or a debug exception for
> > + bus lock detection.
> >
> > off - not enabled
> >
> > warn - the kernel will emit rate limited warnings
>
> rate-limited
>
> > about applications triggering the #AC
> > - exception. This mode is the default on CPUs
> > - that supports split lock detection.
> > + exception or the #DB exception. This mode is
> > + the default on CPUs that supports split lock
>
> support
>
> > + detection or bus lock detection. Default
> > + behavior is from #DB if both features are
>
> I would say is by #DB
>
> > + enabled in hardware.
> >
> > fatal - the kernel will send SIGBUS to applications
> > - that trigger the #AC exception.
> > + that trigger the #AC exception or the #DB
> > + exception. Default behavior is from #AC
>
> and is by #AC
>
> > + if both features are enabled in hardware.
> > +
> > + ratelimit:N -
> > + Set rate limit to N bus locks per second
> > + for bus lock detection. 0 < N <= HZ/2 and
> > + N is approximate. Only applied to non root
>
> non-root
>
> > + user.
>
> users.

I'll fix the issues in the next version.

Thank you very much for your review!

-Fenghua

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