Kernel version >= 2.6.27 check

Jeff Schroeder wrote:
> Awesome tool! I learned about this from the LWN article and
> immediately (stupidly) tried it out on a centos 5 host. Here is a
> patch to add a kernel version check.

This is a nice fix, but the version check should be done against
the proc data being used (which is not necessarily that of the
local kernel).  This required moving kernel_version_check to
after where the src data is read.

capture

@@ -4,7 +4,7 @@
 # capture a memory data snapshot with realtime priority
 mkdir -p $1
 chrt --fifo 99 \
-  cp -a --parents /proc/[0-9]*/{smaps,cmdline,stat} /proc/meminfo $1
+  cp -a --parents /proc/[0-9]*/{smaps,cmdline,stat} /proc/meminfo /proc/version $1
 
 # build a compressed tarball of snapshot
 cd $1/proc