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Instead of using multiple recursive Makefile.am files, use a single
Makefile.am that sets and builds all the basic suite of libraries and
binaries for udev. This reduces the number of files in the source tree, and
also reduces drastically the build time when using parallel-make.
With this setup, all the compile steps will be executed in parallel, and
just the linking stage will be (partially) serialised on the libraries
creation.
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$ udevadm trigger -n -v --subsystem-match=usb --sysname-match=2-1.1*
/sys/devices/pci0000:00/0000:00:1d.7/usb2/2-1/2-1.1
/sys/devices/pci0000:00/0000:00:1d.7/usb2/2-1/2-1.1/2-1.1.1
/sys/devices/pci0000:00/0000:00:1d.7/usb2/2-1/2-1.1/2-1.1.1/2-1.1.1:1.0
/sys/devices/pci0000:00/0000:00:1d.7/usb2/2-1/2-1.1/2-1.1.2
/sys/devices/pci0000:00/0000:00:1d.7/usb2/2-1/2-1.1/2-1.1.2/2-1.1.2:1.0
/sys/devices/pci0000:00/0000:00:1d.7/usb2/2-1/2-1.1/2-1.1.2/2-1.1.2:1.1
/sys/devices/pci0000:00/0000:00:1d.7/usb2/2-1/2-1.1/2-1.1:1.0
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On machines with many thousands of devices:
$ time find /sys -name uevent | wc -l
74876
real 0m33.171s
user 0m3.329s
sys 0m29.719s
the current udevtrigger spends minutes sorting the device list:
$ time /sbin/udevadm trigger --dry-run
real 4m56.739s
user 4m45.743s
sys 0m7.862s
with qsort() it looks better:
$ time udev/udevadm trigger --dry-run
real 0m6.495s
user 0m0.473s
sys 0m5.923s
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Automake like variables with *exec* in the directory names,
to decide, that it isn't *data*:
http://www.gnu.org/software/hello/manual/automake/The-Two-Parts-of-Install.html#The-Two-Parts-of-Install
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That way, libudev.la will not get out of sync with the location of the
development so link.
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