Eric Lee / smarc-fsl-linux-kernel

07 Dec, 2010

1 commit

  • af5568843   lib: Improve EWMA efficiency by using bitshifts ... Browse Code »

    Using bitshifts instead of division and multiplication should improve
    performance. That requires weight and factor to be powers of two, but i think
    this is something we can live with.

    Thanks to Peter Zijlstra for the improved formula!

    Signed-off-by: Bruno Randolf

    --

    v2: use log2.h functions
    Signed-off-by: John W. Linville

    Bruno Randolf
     

19 Nov, 2010

1 commit

  • c5485a7e7   lib: Add generic exponentially weighted moving average (EWMA) function ... Browse Code »

    This adds generic functions for calculating Exponentially Weighted Moving
    Averages (EWMA). This implementation makes use of a structure which keeps the
    EWMA parameters and a scaled up internal representation to reduce rounding
    errors.

    The original idea for this implementation came from the rt2x00 driver
    (rt2x00link.c). I would like to use it in several places in the mac80211 and
    ath5k code and I hope it can be useful in many other places in the kernel code.

    Signed-off-by: Bruno Randolf
    Reviewed-by: KOSAKI Motohiro
    Signed-off-by: John W. Linville

    Bruno Randolf