Linux (non-transparent) per-process hugepage accounting
- by Dan Pritts
I've recently converted some java apps to run with linux manually-configured hugepages. I've got about 10 tomcats running on a system and I am interested in knowing how much memory each one is using.
I can get summary information out of /proc/meminfo as described in Linux Huge Pages Usage Accounting.
But I can't find any tools that tell me about the actual per-process hugepage usage.
I poked around in /proc/pid/numa_stat and found some interesting information that led me to this grossity:
function pshugepage () {
HUGEPAGECOUNT=0
for num in `grep 'anon_hugepage.*dirty=' /proc/$@/numa_maps | awk '{print $6}' | sed 's/dirty=//'` ; do
HUGEPAGECOUNT=$((HUGEPAGECOUNT+num))
done
echo process $@ using $HUGEPAGECOUNT huge pages
}
The numbers it gives me are plausible, but i'm far from confident this method is correct.
Environment is a quad-CPU dell, 64GB ram, RHEL6.3, oracle jdk 1.7.x (current as of 20130728)
