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SubjectRe: [PATCH v29] RAS: Add a tracepoint for reporting memory controller events
On Wed, Jun 06, 2012 at 07:33:19AM -0300, Mauro Carvalho Chehab wrote:
> RAS: Add a tracepoint for reporting memory controller events
> From: Mauro Carvalho Chehab <>

[ … ]

> The tracepoint printk will be displayed like:
> mc_event: [quant] (Corrected|Uncorrected|Fatal) error:[error msg] on memory stick [label] ([location] [edac_mc detail] [driver_d$
> Where:
> [quant] is the quantity of errors
> [error msg] is the driver-specific error message
> (e. g. "memory read", "bus error", ...);
> [location] is the location in terms of memory controller and
> branch/channel/slot, channel/slot or csrow/channel;
> [label] is the memory stick label;
> [edac_mc detail] describes the address location of the error
> and the syndrome;
> [driver detail] is driver-specifig error message details,
> when needed/provided (e. g. "area:DMA", ...)
> For example:
> mc_event: 1 Corrected error:memory read on memory stick DIMM_1A (mc:0 location:0:0:0 page:0x586b6e offset:0xa66 grain:32 syndrome:0x0 area:DMA)
> Of course, any userspace tools meant to handle errors should not parse
> the above data. They should, instead, use the binary fields provided by
> the tracepoint, mapping them directly into their Management Information
> Base.
> NOTE: The original patch was providing an additional mechanism for
> MCA-based trace events that also contained MCA error register data.
> However, as no agreement was reached so far for the MCA-based trace
> events, for now, let's add events only for memory errors.
> A latter patch is planned to change the tracepoint, for those types
> of event.
> Cc: Aristeu Rozanski <>
> Cc: Doug Thompson <>
> Cc: Steven Rostedt <>
> Cc: Frederic Weisbecker <>
> Cc: Ingo Molnar <>
> Signed-off-by: Mauro Carvalho Chehab <>

Ok, this is starting to shape up, here's the output on my box here: [008] .N.. 144.149649: mc_event: 1 Corrected error: amd64_edac on unknown memory (mc:0 location:3:1:-1 address:0x000007ba grain:2 syndrome:0x0000ac71)

Tony, any objections?


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