[lkml]   [2008]   [Sep]   [25]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
Messages in this thread
    SubjectRe: [RFC PATCH 1/3] Unified trace buffer
    > I rather like this idea, as it gives small entries (the common case) the
    > least overhead but does allow for larger ones.
    > By also putting the time in there you can do the merge sort iterator,
    > Linus was right that everybody wants this anyway.
    > As for delta encoding the time, we could make the tick log the absolute
    > time packet, that's at least 100Hz and it already has to compute the
    > full gtod thing anyway.
    > I don't much like Linus' idea of bringing type information back into the
    > primitive header (sorry Linus ;-)). I'd much rather keep that
    > abstraction in the next layer.

    There is part of the type stuff that belongs in the lower layer, it seems -
    the padding events for the up-to-end-of-page buffering, and the timestamp
    extensions. It seems wrong to split those across two layers.

    But perhaps we can keep a couple of bits for this, and three of the bits
    to represent the length of the data payload (maybe in 4 byte multiples
    rather than bytes?) That'd let up to 28 bytes as a payload in a short event.

     \ /
      Last update: 2008-09-25 16:35    [W:0.022 / U:1.316 seconds]
    ©2003-2016 Jasper Spaans. hosted at Digital OceanAdvertise on this site