[Bug 730441] New: dmabuf: shared the mapping with shared copies of the memory

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=730441
  GStreamer | gst-plugins-base | git

           Summary: dmabuf: shared the mapping with shared copies of the
                    memory
    Classification: Platform
           Product: GStreamer
           Version: git
        OS/Version: Linux
            Status: UNCONFIRMED
          Severity: enhancement
          Priority: Normal
         Component: gst-plugins-base
        AssignedTo: gstreamer-bugs at lists.freedesktop.org
        ReportedBy: m.olbrich at pengutronix.de
         QAContact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---


Created an attachment (id=276856)
 --> (https://bugzilla.gnome.org/attachment.cgi?id=276856)
patch

With lots of shared memory instances (e.g. created by a RTP payloader) the
overhead of duplicating the file descriptor and crating extra mappings is
significant.
To avoid this, the parent memory maps the whole region and the shared
copies just reuse the same mapping.

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