ECC corrects some types of errors (single-bit errors), but detects others as uncorrectable; how should those errors be handled? Probably not via an unhandled machine check.
Hardware support for Forward Error Correction would certainly be nice.
Software FEC support from the kernel wouldn't help applications that directly access persistent memory from userspace. Software FEC support in userspace would still need the kernel to pass through errors rather than treating them as fatal. (For instance, the kernel could send a signal when it detects an error, but provide a way for the application to explicitly read the data including any errors, so that the application can apply any error-correcting codes it has.)
Hardware support for Forward Error Correction would certainly be nice.
Software FEC support from the kernel wouldn't help applications that directly access persistent memory from userspace. Software FEC support in userspace would still need the kernel to pass through errors rather than treating them as fatal. (For instance, the kernel could send a signal when it detects an error, but provide a way for the application to explicitly read the data including any errors, so that the application can apply any error-correcting codes it has.)