be no major change in performance from this change at this time but this
will allow other work to progress: Giant lock removal around VM system
in favor of per-object mutexes, ranged fsyncs, more optimal COMMIT rpc's for
NFS, partial filesystem syncs by the syncer, more optimal object flushing,
etc. Note that the buffer cache is already using a similar splay tree
mechanism.
Note that a good chunk of the old hash table code is still in the tree.
Alan or I will remove it prior to the release if the new code does not
introduce unsolvable bugs, else we can revert more easily.
Submitted by: alc (this is Alan's code)
Approved by: re
Requested by: Most developers
Apologies to: Most developers, with special note to <ken@kdm.org>
Collabroation in the future with: Kenneth D. Merry <ken@kdm.org>
into memory. This brings us in line with the other architectures and
more easily allows us to do machine dependent processing on the ELF
file (such as scanning for unwind information).
appropriate. Before this, a 2.9 GB file was misleadingly reported as
"2G". This mostly brings unit_adjust() in line with what is in du(1).
Reviewed by: jmallett
Approved by: nik
the wheel group has no explicit members listed in /etc/group. This adds
the "exempt_if_empty" flag to pam_wheel in the default configuration;
in some environments, it may be appropriate to remove this flag, however,
this default is the same as pre-pam_wheel.
Reviewed by: markm
Sponsored by: DARPA, Network Associates Laboratories
group membership requirement if the group has no explicit members listed
in /etc/group. By default, this group is the wheel group; setting this
flag restores the default BSD behavior from 4.x.
Reviewed by: markm
Requested by: various
Sponsored by: DARPA, Network Associates Laboratories
to help clean up. After selecting a potential buffer to write, this
patch has it acquire a lock on the vnode that owns the buffer before
trying to write it. The vnode lock is necessary to avoid a race with
some other process holding the vnode locked and trying to flush its
dirty buffers. In particular, if the vnode in question is a snapshot
file, then the race can lead to a deadlock. To avoid slowing down the
buf_daemon, it does a non-blocking lock request when trying to lock
the vnode. If it fails to get the lock it skips over the buffer and
continues down its queue looking for buffers to flush.
Sponsored by: DARPA & NAI Labs.
(sizeof(destination_buffer) - 1) bytes into the destination buffer.
This was not harmful because they currently both provide space for
(MAXCOMLEN + 1) bytes.
of a file descriptor has NULL entries, so don't dereference the table entries
to get the owners ever -- don't print the owners when processing a thread_dump
request as a result of SIGINFO.
Reviewed by: deischen
