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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 <mchehab@redhat.com>

    [ … ]

    > 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 <arozansk@redhat.com>
    > Cc: Doug Thompson <norsk5@yahoo.com>
    > Cc: Steven Rostedt <rostedt@goodmis.org>
    > Cc: Frederic Weisbecker <fweisbec@gmail.com>
    > Cc: Ingo Molnar <mingo@redhat.com>
    > Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

    Ok, this is starting to shape up, here's the output on my box here:

    mcegen.py-3009 [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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