git: devfs - Introduce MPSAFE read/write/ioctl support
commit 3a1032a61f3ea2b7ca93c34278f5220f31a9b9a6
Author: Alex Hornung <ahornung@gmail.com>
Date: Mon Dec 21 08:22:46 2009 +0000
devfs - Introduce MPSAFE read/write/ioctl support
* Add D_MPSAFE_READ, D_MPSAFE_WRITE and D_MPSAFE_IOCTL defines for use
with the dev_ops structure to mark the read,write and/or ioctl methods
as mpsafe.
* Change devfs so that it won't acquire the mplock for
read/writes/ioctls that are marked as MPSAFE.
* Add some statistics under sysctl vfs.devfs about the number of read
and writes done with the mplock and without it.
* While here, MPSAFE specf_stat in devfs so it doesn't acquire the
mplock anymore as it doesn't even need it.
Summary of changes:
sys/sys/device.h | 3 +
sys/vfs/devfs/devfs_core.c | 2 +-
sys/vfs/devfs/devfs_vnops.c | 121 +++++++++++++++++++++++++++----------------
3 files changed, 80 insertions(+), 46 deletions(-)
http://gitweb.dragonflybsd.org/dragonfly.git/commitdiff/3a1032a61f3ea2b7ca93c34278f5220f31a9b9a6
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