CVS commit: src/sys/kern

[Simon Burge <simonb%netbsd.org@localhost>]

Module Name:    src
Committed By:   simonb
Date:           Fri Mar 26 00:31:55 UTC 2004

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

Log Message:
Give buf_lotsfree() a bit of a service:
- Fix a 32-bit overflow that could erroneously return true even if the
  currently allocated buffer memory was greater than the high water mark.
- Add an early check for bufmem > hiwater to avoid a needless call to
  random().
- Sprinkle some comments.

Add a vm.bufmem sysctl so the current bufmem value can be easily queried
from userland.

Reviewed by Thor Simon.


To generate a diff of this commit:
cvs rdiff -r1.121 -r1.122 src/sys/kern/vfs_bio.c

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