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 /configure.ac | |
| 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 'configure.ac')
| -rw-r--r-- | configure.ac | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/configure.ac b/configure.ac index a6b53dbe54..f1d008e000 100644 --- a/configure.ac +++ b/configure.ac @@ -14,9 +14,9 @@ AC_PREFIX_DEFAULT([/usr]) test "$prefix" = NONE && test "$exec_prefix" = NONE && exec_prefix= dnl /* libudev version */ -LIBUDEV_LT_CURRENT=3 +LIBUDEV_LT_CURRENT=4 LIBUDEV_LT_REVISION=0 -LIBUDEV_LT_AGE=3 +LIBUDEV_LT_AGE=4 AC_SUBST(LIBUDEV_LT_CURRENT) AC_SUBST(LIBUDEV_LT_REVISION) AC_SUBST(LIBUDEV_LT_AGE) |