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    SubjectRe: [PATCH RFC] x86: avoid atomic operation in test_and_set_bit_lock if possible
    On Fri, Mar 25, 2011 at 05:59:31AM -0400, Ingo Molnar wrote:
    > > [...] but you probably need to make a full pass to make sure we dont have a
    > > MSR failure -this should return false in this case.
    > Wanted to keep this patch simple - we are not really hitting MSR
    > failure cases in practice, and by getting the message the user is at
    > least warned that *something* is amiss.

    AFAIR, Robert was telling me couple of months ago about some braindead
    BIOSes doing power management by using at least one perf counter. A
    radical approach like that might interfere with that BIOS since it will
    try to reprogram the counter continuously and f*ck up OS PMU use.

    Anyway, adding Robert for clarification.


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