[PATCH 0/7] printing: improve printcap update CPU usage
ddiss at suse.de
Mon Aug 4 16:26:20 MDT 2014
On Mon, 4 Aug 2014 15:58:00 +0200, David Disseldorp wrote:
> This patch-set attempts to address bug 10652: Samba consumes a lot of
> CPU when re-reading printcap info.
> It does so with the following changes to the printcap update procedure:
> - Use traverse_read for printer list share updates, instead of exclusive
> (write locked) traversals. This significantly reduces printer_list.tdb
> lock contention.
> - As suggested by Volker, reload per-client smbd printer share
> inventories on client enumeration, rather than immediately after every
> printer list update.
> - If enumeration is requested but the printer list has not changed,
> then skip the printer share inventory update.
Looks like one further change is needed here to handle clients that do
not enumerate printers prior to open, such as cupsaddsmb.
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