Add text noting that since kernel 2.6.16, /proc/slabinfo is

only available if CONFIG_SLAB is enabled.

man5/proc.5

@@ -57,7 +57,7 @@
 .\" to see what information could be imported from that file
 .\" into this file.
 .\"
-.TH PROC 5 2007-08-27 "Linux" "Linux Programmer's Manual"
+.TH PROC 5 2007-09-30 "Linux" "Linux Programmer's Manual"
 .SH NAME
 proc \- process information pseudo-filesystem
 .SH DESCRIPTION
@@ -1021,7 +1021,11 @@ same process.
 .TP
 .I /proc/slabinfo
 Information about kernel caches.
-The columns are:
+Since Linux 2.6.16 this file is only present if the CONFIG_SLAB kernel
+configuration option is enabled.
+The columns in
+.I /proc/slabinfo 
+are:
 .nf
 cache-name
 num-active-objs

man5/slabinfo.5

@@ -20,7 +20,7 @@
 .\" Formatted or processed versions of this manual, if unaccompanied by
 .\" the source, must acknowledge the copyright and authors of this work.
 .\"
-.TH SLABINFO 5 2001-06-19 "" "Linux Programmer's Manual"
+.TH SLABINFO 5 2007-09-30 "" "Linux Programmer's Manual"
 .SH NAME
 /proc/slabinfo \- Kernel slab allocator statistics
 .SH SYNOPSIS
@@ -61,8 +61,7 @@ and the number of pages per slab are given.
 
 Note that because of object alignment and slab cache overhead,
 objects are not normally packed tightly into pages.
-Pages with
-even one in-use object are considered in-use and cannot be
+Pages with even one in-use object are considered in-use and cannot be
 freed.
 
 Kernels compiled with slab cache statistics will also have
@@ -114,3 +113,8 @@ echo "\fIcache_name limit batchcount\fP" > /proc/slabinfo
 .I /proc/slabinfo
 exists since Linux 2.1.23.
 SMP per-CPU caches exist since Linux 2.4.0-test3.
+.SH NOTES
+Since Linux 2.6.16 the file 
+.I /proc/slabinfo 
+is only present if the CONFIG_SLAB kernel 
+configuration option is enabled.