On Thu, Oct 2, 2014 at 7:32 AM, Chris Metcalf <[email protected]> wrote: > This change adds support for clock_gettime with CLOCK_REALTIME > and CLOCK_MONOTONIC using vDSO. It also updates the vdso > struct nomenclature used for the clocks to match the x86 code > to keep it easier to update going forward. > > We also support the *_COARSE clockid_t, for apps that want speed > but aren't concerned about fine-grained timestamps; this saves > about 20 cycles per call (see http://lwn.net/Articles/342018/). > > Signed-off-by: Chris Metcalf <[email protected]> > --- > arch/tile/include/asm/vdso.h | 15 ++-- > arch/tile/kernel/time.c | 45 ++++++++--- > arch/tile/kernel/vdso/vdso.lds.S | 2 + > arch/tile/kernel/vdso/vgettimeofday.c | 145 > +++++++++++++++++++++++++++++----- > 4 files changed, 172 insertions(+), 35 deletions(-) > > v2: use the x86 code as a model to address both John Stultz's > observation about sub-nanosecond updates, as well as to address > Thomas Gleixner's observation about minimizing time spent with > the seqlock held. Note that I kept the "unlikely" that Thomas > doubted would help, just for parallelism with the x86 code. > v3: rebase onto 3.17-rc7
Looks ok to me. Acked-by: John Stultz <[email protected]> thanks -john -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
