Mateusz Guzik 1fccb43c39 vfs: change si_usecount management to count used vnodes ... Currently si_usecount is effectively a sum of usecounts from all associated vnodes. This is maintained by special-casing for VCHR every time usecount is modified. Apart from complicating the code a little bit, it has a scalability impact since it forces a read from a cacheline shared with said count. There are no consumers of the feature in the ports tree. In head there are only 2: revoke and devfs_close. Both can get away with a weaker requirement than the exact usecount, namely just the count of active vnodes. Changing the meaning to the latter means we only need to modify it on 0<->1 transitions, avoiding the check plenty of times (and entirely in something like vrefact). Reviewed by: kib, jeff Tested by: pho Differential Revision: https://reviews.freebsd.org/D22202		2019-11-20 12:05:59 +00:00
..
devfs.h	sys/fs: further adoption of SPDX licensing ID tags.	2017-11-27 15:15:37 +00:00
devfs_devs.c	Ensure that directory entry padding bytes are zeroed.	2018-11-23 22:24:59 +00:00
devfs_dir.c	r326394 is calling malloc with M_WAITOK under a lock, revert for now	2017-11-30 14:06:54 +00:00
devfs_int.h	sys/fs: further adoption of SPDX licensing ID tags.	2017-11-27 15:15:37 +00:00
devfs_rule.c	sys/fs: further adoption of SPDX licensing ID tags.	2017-11-27 15:15:37 +00:00
devfs_vfsops.c	devfs: use MNTK_NOMSYNC	2019-10-13 15:41:47 +00:00
devfs_vnops.c	vfs: change si_usecount management to count used vnodes	2019-11-20 12:05:59 +00:00