Messages in this thread | | | Date | Sat, 9 Jan 2016 14:15:09 -0800 | Subject | Re: [PATCH v8 3/3] x86, mce: Add __mcsafe_copy() | From | Dan Williams <> |
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On Sat, Jan 9, 2016 at 11:39 AM, Tony Luck <tony.luck@gmail.com> wrote: > On Sat, Jan 9, 2016 at 9:57 AM, Andy Lutomirski <luto@amacapital.net> wrote: >> On Sat, Jan 9, 2016 at 9:48 AM, Tony Luck <tony.luck@gmail.com> wrote: >>> ERMS? >> >> It's the fast string extension, aka Enhanced REP MOV STOS. On CPUs >> with that feature (and not disabled via MSR), plain ol' rep movs is >> the fastest way to copy bytes. I think this includes all Intel CPUs >> from SNB onwards. > > Ah ... very fast at copying .. but currently not machine check recoverable.
Hmm, I assume for the pmem driver I'll want to check at runtime if the cpu has machine check recovery and fall back to the faster copy if it's not available?
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