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
