Messages in this thread | | | Date | Sun, 12 Feb 2012 13:48:25 +0100 | From | Borislav Petkov <> | Subject | Re: [PATCH v3 01/31] events/hw_event: Create a Hardware Events Report Mecanism (HERM) |
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On Fri, Feb 10, 2012 at 12:17:51PM -0200, Mauro Carvalho Chehab wrote: > Em 10-02-2012 11:41, Borislav Petkov escreveu: > > On Thu, Feb 09, 2012 at 10:01:00PM -0200, Mauro Carvalho Chehab wrote: > >> In order to provide a proper hardware event subsystem, let's > >> encapsulate hardware events into a common trace facility, and > >> make both edac and mce drivers to use it. After that, common > >> facilities can be moved into a new core for hardware events > >> reporting subsystem. This patch is the first of a series, and just > >> touches at mce. > > > > I think it would work too if you had only one event: > > > > * trace_hw_error(...) > > > > which would have as an argument a string describing it, like > > "Uncorrected Memory Read Error", "Memory Read Error (out of range)" "TLB > > Multimatch Error" etc., followed by the rest of the error info. > > > > Currently, you're introducing at least 5 trace_* calls _only_ for memory > > errors. What about the remaining couples of tens of errors which haven't > > been addressed yet? > > Good point. > > The way I see it is that: > > - a non-memory related, non-parsed MCE event would generate a "mce_record" trace > (we need an additional patch to disable it when the error is parsed. > I'll address it after finishing the tests with a few other platforms); > > As more MCE parsers are added at the core, the situations where such event will > be generated will reduce, and will eventually disappear in long term. > > - a non-x86 event (or a x86 event for a memory controller that is not addressed > by MCE events) will use a "mc_error"; > > - a x86 event generated via MCE will use a "mc_error_mce". > > There are two special events defined when there's a memory error _and_ a driver > bug: > > "mc_out_of_range_mce" and "mc_out_of_range". > > While the name of them and one of the parameters are memory-controller specific, > it should be easy to make it generic enough to be used by other types of errors. > > The previous EDAC logic were to generate an out of range printk and return. With > the changes I made, it is possible to let the EDAC to provide the information > parsed, just discarding the bad parsed value. That's the approach I took, as the > other information there may be useful. By taking such approach, the MCE information > will be shown by the "mc_error_mce" trace. So, we can remove the "mc_out_of_range_mce" > without loosing any information. > > In any case, we can't merge the *_mce with the non-mce variant, as the mce.h header > is arch specific and doesn't exist on PPC and tilera architectures. > > So, the only event that we can actually remove is "mc_out_of_range_mce", if we let > the core generate two events for badly parsed error events. What do you think?
As I said already, error messages from the drivers should be something very seldom so they don't need a special trace event.
But most importantly, _ALL_ hw errors could use a single trace_hw_error() macro which has a single string argument containing all the required error info as a string since the error format is different based on the error type. In any case, memory errors are not special! As I said also before, we cannot have a trace-call for every error type which adds additional information or which might generate an error while producing that error info.
-- Regards/Gruss, Boris.
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