I run out of vmalloc space fairly often.  This patch helps me to figure
out whether I'm seeing vmalloc space fragmentation, or I've actually out
of vmalloc area.  It adds 3 fields to /proc/meminfo: total vmalloc
space, used vmalloc space, and the largest remaining chunk of free
vmalloc space.   
-- 
Dave Hansen
haveblue@us.ibm.com