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Removed with this is SAS disk support which never really worked properly,
and legacy IDE disk support, which can be re-implemented if needed.
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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.
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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>
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Signed-off-by: Alan Jenkins <alan-jenkins@tuffmail.co.uk>
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Some broken fake cdrom drives return ID_CDROM_MEDIA_STATE=blank.
$ /lib/udev/cdrom_id -d /dev/sr1
main: probing: '/dev/sr1'
cd_inquiry: INQUIRY: [Nokia ][S60 ][1.0 ]
cd_profiles: GET CONFIGURATION: number of profiles 76
cd_profiles: current profile 0x08
cd_media_toc: READ TOC: len: 12
cd_media_toc: last track 1 starts at block 0
cd_media_info: disk type 00
ID_CDROM=1
ID_CDROM_MRW=1
ID_CDROM_MRW_W=1
ID_CDROM_MEDIA=1
ID_CDROM_MEDIA_CD=1
ID_CDROM_MEDIA_STATE=blank
Others work fine, but ID_CDROM_MEDIA_STATE is not needed for non-writable CDROM media:
$ /lib/udev/cdrom_id -d /dev/sr1
main: probing: '/dev/sr1'
cd_inquiry: INQUIRY: [SanDisk ][U3 Cruzer Micro ][8.02]
cd_profiles: GET CONFIGURATION: number of profiles 72
cd_profiles: current profile 0x08
cd_media_toc: READ TOC: len: 20
cd_media_toc: track=1 info=0x4(data) start_block=0
cd_media_toc: last track 1 starts at block 0
cd_media_info: disk type 00
ID_CDROM=1
ID_CDROM_MRW=1
ID_CDROM_MRW_W=1
ID_CDROM_MEDIA=1
ID_CDROM_MEDIA_CD=1
ID_CDROM_MEDIA_STATE=complete
ID_CDROM_MEDIA_SESSION_COUNT=1
ID_CDROM_MEDIA_TRACK_COUNT=1
ID_CDROM_MEDIA_TRACK_COUNT_DATA=1
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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.
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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.
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> 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?
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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>
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Drop pretty expensive case-insensitive matching, and key names in
mixed or lowercase are not supported anyway.
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The timeout wasn't working when settle was run as root:
# udevadm control --stop-exec-queue
# udevadm trigger
# udevadm settle --timeout=1
... (hangs)
Signed-off-by: Alan Jenkins <alan-jenkins@tuffmail.co.uk>
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