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Event processes now get re-used after they handled an event. This reduces
pressure on the CPU significantly because cloned event processes no longer
cause page faults in the main daemon. After the events have settled, the
no longer needed worker processes get killed.
The math in skip_to() was the wrong way round and allocated a
variable size array on the stack with a massively negative size.
Signed-off-by: Alan Jenkins <alan-jenkins@tuffmail.co.uk>
String substitutions in OWNER and GROUP keys were broken in udev 137-142.
Explicitly test for this, since such breakage will not manifest in typical
rulesets.
On Fri, May 22, 2009 at 16:15, Alan Jenkins <alan-jenkins@tuffmail.co.uk> wrote:
> I've been looking at what is responsible for all the path lookup activity in
> coldplug. On my debian stable system, it looks like every device gets its
> parent looked up in sysfs. I think this is due to SUBSYSTEMS matches.
>
> I see the udev default rules are different, but it looks like they still
> test for SUBSYSTEMS on every single device. Should we add SUBSYSTEM="scsi_generic"
> to these three rules?
Directory lookups show up in profiling. The queue files are responsible
for a large proportion of file-related system calls in udev coldplug.
Instead of creating a file for each event, append their details to a
log file. The file is periodically rebuilt (garbage-collected) to
prevent it from growing indefinitely.
This single queue file replaces both the queue directory and the
uevent_seqnum file. On desktop systems the file tends not to grow
beyond one page. So it should also save a small amount of memory in
tmpfs.
Tests on a running EeePC indicate average savings of 5% *udevd* cpu time
as measured by oprofile. __link_path_walk is reduced from 1.5% to
1.3%. It is not completely clear where the rest of the gains come from.
In tests running ~400 events, the queue file is rebuilt about 5 times.
Signed-off-by: Alan Jenkins <alan-jenkins@tuffmail.co.uk>
