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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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| .. | ||
| .gitignore | ||
| exported_symbols | ||
| libudev-ctrl.c | ||
| libudev-device-db-write.c | ||
| libudev-device.c | ||
| libudev-enumerate.c | ||
| libudev-list.c | ||
| libudev-monitor.c | ||
| libudev-private.h | ||
| libudev-queue-export.c | ||
| libudev-queue.c | ||
| libudev-util.c | ||
| libudev.c | ||
| libudev.h | ||
| libudev.pc.in | ||
| Makefile.am | ||
| test-libudev.c | ||