CVS commit: src/sys/kern

["Jaromir Dolecek" <jdolecek%netbsd.org@localhost>]

Module Name:    src
Committed By:   jdolecek
Date:           Mon Apr 10 21:34:37 UTC 2017

Modified Files:
        src/sys/kern: vfs_wapbl.c

Log Message:
improve performance of journal writes by parallelizing the I/O - use 4 bufs
by default, add sysctl vfs.wapbl.journal_iobufs to control it

this also removes need to allocate iobuf during commit, so it
might help to avoid deadlock during memory shortages like PR kern/47030


To generate a diff of this commit:
cvs rdiff -u -r1.94 -r1.95 src/sys/kern/vfs_wapbl.c

Please note that diffs are not public domain; they are subject to the
copyright notices on the relevant files.