diff options
| author | Alan Jenkins <alan-jenkins@tuffmail.co.uk> | 2009-05-21 22:22:37 +0200 |
|---|---|---|
| committer | Kay Sievers <kay.sievers@vrfy.org> | 2009-05-21 22:22:37 +0200 |
| commit | f503f6b22fa54d1a65156a51d8b3311190c73ae5 (patch) | |
| tree | 5003144371ce463fe5ba2387b9777cd8cddd24ad /udev/Makefile.am | |
| parent | f9b3f88f71f5bdfb18aa4bfba00d72fa41fdf286 (diff) | |
udevd: implement a more efficient queue file format
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>
Diffstat (limited to 'udev/Makefile.am')
| -rw-r--r-- | udev/Makefile.am | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/udev/Makefile.am b/udev/Makefile.am index fa8279dd61..6cd2f23dc3 100644 --- a/udev/Makefile.am +++ b/udev/Makefile.am @@ -30,6 +30,7 @@ common_files = \ lib/libudev-monitor.c \ lib/libudev-enumerate.c \ lib/libudev-queue.c \ + lib/libudev-queue-export.c \ lib/libudev-ctrl.c if USE_SELINUX |