lkml.org 
[lkml]   [2010]   [May]   [18]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
    /
    Date
    From
    SubjectRe: [PATCH] x86: Export tsc related information in sysfs
    On 05/18/2010 12:16 PM, Dan Magenheimer wrote:
    >
    > Oops, hit send too soon.
    >
    > And the reason I expect tglx/arjan/andi/mingo to disagree is because
    > their position is that there is NO safe use for rdtsc in userspace EVER!
    > Whereas your position stated earlier:
    >
    >> There are restricted uses of the TSC in userspace which are still
    >> useful
    >> (mainly involving performance analysis and/or CPU-locked processes).
    >
    > says there are.
    >
    > While the engineer in me agrees with tglx/arjan/andi/mingo, the
    > realist in me agrees with you.

    I should have added "that are not related to wall time" to the statement
    above.

    Furthermore, vsyscalls are user space from a CPU perspective.

    -hpa



    \
     
     \ /
      Last update: 2010-05-18 21:33    [from the cache]
    ©2003-2014 Jasper Spaans. hosted at Digital Ocean