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    SubjectRe: add core dump file name pattern option for cpu id
    On Thu, 2004-07-15 at 15:14, Joshua Aas wrote:
    > Normally core dumps can be blamed on a program itself. However, core
    > dumps can also be the result of faulty hardware. Tracking down what CPU
    > a failure occurred on usually requires that hardware be powered off
    > piece by piece until no core dumps occur (on big machines this can take
    > a long time). Another option is to run the test pinned to each CPU until
    > the core dump occurs, but this can also take a long time on big
    > machines. It would be very beneficial if the kernel was capable of
    > making the CPU ID of the CPU the core dump occurred on available
    > somehow. The following patch adds an option (%c) to the core dump file
    > naming pattern convention for putting the CPU ID into core dump file
    > names.
    > Signed-off-by: Josh Aas <>
    --- a/fs/exec.c 2004-07-13 14:32:24.000000000 -0500
    +++ b/fs/exec.c 2004-07-15 13:16:17.000000000 -0500
    @@ -1276,6 +1276,14 @@ void format_corename(char *corename, con
    goto out;
    out_ptr += rc;
    + /* cpu id */
    + case 'c':
    + rc = snprintf(out_ptr, out_end - out_ptr,
    + "%d", smp_processor_id());
    + if (rc > out_end - out_ptr)
    + goto out;
    + out_ptr += rc;
    + break;

    Is there any reason this couldn't be taken into the kernel? I didn't get
    any response at all and it seems to be a safe and useful patch. Any
    feedback would be appreciated.

    Josh Aas
    Silicon Graphics, Inc. (SGI)
    Linux System Software

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