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    SubjectRe: [GIT PULL RFC] pvclock cleanups and pvclock vsyscall support
    On 10/15/2009 04:28 AM, Jeremy Fitzhardinge wrote:
    > Hi all,
    >
    > This series contains several things:
    >
    > - Unify the separate vdso and vsyscall implementations of vgettimeofday and
    > vgetcpu. There's at least one bugfix which was only applied to one copy
    > (ignore tcache in vgetcpu was only applied to the vdso version); this
    > should avoid such skews in future.
    >
    > - Bug fixes for the Xen and KVM clocksource.read functions to make sure
    > the returned time doesn't regress compared to clocksource.cycle_last.
    > (Probably stable material.)
    >
    > - Make sure the pvclock rdtsc is surrounded by appropriate barriers so
    > that it doesn't get speculated to the wrong place with respect to reading
    > the time parameters. (Probably stable material.)
    >
    > - General cleanups of the pvclock algorithm (there's no need to make a local
    > copy of the time parameters before use).
    >
    > - Add a new CONFIG_X86_VSYSCALL to control the compilation of vsyscall-related
    > code rather than just using CONFIG_X86_64 - we may want to implement 32-bit
    > vsyscall at some point, and this will make it easier.
    >
    > - Add the sched notifier for task migration between CPUs, for use by
    > pvclock vread.
    >
    > - Implement a pvclock vread function, so that pvclock-using clocksources can be
    > used by vsyscall/vdso vgettimeofday and vclock_gettime.
    >
    > - Use pvclock vread in the Xen clocksource.
    >

    Looks good to me.

    Acked-by etc.

    --
    I have a truly marvellous patch that fixes the bug which this
    signature is too narrow to contain.



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