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    • Alexander Larsson's avatar
      Initial support for dtrace and systemtap · bef9efd0
      Alexander Larsson authored
      This adds static markers for dtrace, which are also usable
      by systemtap. Additionally it adds a tapset for systemtap
      that makes it easier to use the static markers.
      
      These are enabled by default.
      
      This initial set of probes is rather limited:
      
      * allocation and free using g_malloc & co
      * allocation and free using g_slice
      * gquark name tracking (useful for converting quarks to strings in probes)
      
      Notes on naming:
      
      Its traditional with dtrace to use probe names with dashes as
      delimiter (slice-alloc). Since dashes are not usable in identifiers
      the C code uses double underscores (slice__alloc) which is converted
      to dashes in the UI. We follow this for the shared lowlevel probe
      names.
      
      Additionally dtrace supports putting a "provider" part in the probe
      names which is essentially a namespacing thing. On systemtap this
      field is currently ignored (but may be implemented in the future), but
      this is not really a problem since in systemtap the probes are
      specified by combining the solib file and the marker name, so there
      can't really be name conflicts.
      
      For the systemtap tapset highlevel probes we instead use names that
      are systemtapish with single dashes as separators.
      
      https://bugzilla.gnome.org/show_bug.cgi?id=606044
      bef9efd0