What happened to the vm.pagecache kernel tunable in RHEL 5?
Issue
It seems that at some point in the kernel's lifetime, the documentation in /usr/share/doc/kernel-*/Documenation/filesystems/proc.txt in section 2.4 dropped the bit about /proc/sys/vm/pagecache, which still exists.
In RHEL3, /proc/sys/vm/pagecache was a tunable with three parameters: min, borrow, and max. But in RHEL5 it looks like it just has one value:
# cat /proc/sys/vm/pagecache
100
and without documentation in the kernel-doc RPM, we have no idea what this value means.
Environment
- Red Hat Enterprise Linux (RHEL) 5
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