Re: [gamin] Make gamin sleep when nothing changes in the filesystem

[Zbigniew Chyla <mail zbigniew chyla pl>]

Hello,

Is anybody there? :)


Regards
Zbigniew


Dnia 19-01-2006, czw o godzinie 20:36 +0100, Zbigniew Chyla napisał:
> Hi,
> 
> I'm working on Linux 2.6.15 with inotify support enabled, so I couldn't
> understand why gam_server sometimes shows on "top" even if the machine is
> idle and the filesystem doesn't change at all (at least in directories that
> gamin clients may be interested in).
> After running strace I found out that that gam_server wakes up tens times
> per second (because of calling poll(2) with very short timeouts) when
> nothing changes in the filesystem!
> 
> The attached patches (with included ChangeLog entries) fix this behaviour
> by switching from static registrations of timeout functions to more dynamic
> approach (executing timeout function that processes some queue makes sense
> only if the queue is not empty).
> 
> gamin-inotify.diff:
> Introduces dynamic handling for events_to_process, missing_list and
> links_list.
> 
> gamin-connections.diff:
> Dynamic handling of per-connection GamConnDataPtr->eq queue and detection
> of idle period.
> As a side effect this change improves idle detection mechanism. With this
> patch the server quits if the connections queue is really empty for 30
> seconds. Previously the timeout function was only "sampling" state of the
> queue so it could miss a client connection shorter than 1 second.
> 
> gamin-pool-basic.diff:
> Dynamic handling of lists of resources from gam_poll_generic.c used inside
> gam_poll_basic.c. Registering gam_poll_basic_scan_callback statically makes
> no sense because it seems that with inotify this code is not used at all
> (anyway, the timeout function will be registered dynamically if needed).
> 
> Additionally I attached a simple patch (gamin-time-syscall.diff) that lets
> you avoid calling time(2) syscall too often (twice per each stat(2) on
> symlink or missing file).
> 
> 
> Regards
> Zbigniew
> 
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