nfs-utils: decrease RLIMIT_NOFILE to 4k for systemd
On systemd, it set RLIMIT_NOFILE to 512k, since do_testimage
for core-image-sato-sdk has memory limitation (256Mib) which
caused rpc.statd failed with out of memory.
[ 531.306146] Out of memory: Kill process 193 (rpc.statd) score 200 or sacrifice child
The rpc.statd and rpc.mountd allocates memory according to
RLIMIT_NOFILE, so decrease it to 4k to keep sync with sysvinit
After applying the patch, the memory cost is the same with sysvinit:
root@qemux86-64:~# systemctl status nfs-statd
* nfs-statd.service - NFS status monitor for NFSv2/3 locking.
Loaded: loaded (/lib/systemd/system/nfs-statd.service; enabled; vendor preset: enabled)
Active: active (running) since Tue 2019-08-20 03:16:18 UTC; 3min 26s ago
Main PID: 343 (rpc.statd)
Tasks: 1 (limit: 271)
Memory: 1.0M
root@qemux86-64:~# systemctl status nfs-mountd
* nfs-mountd.service - NFS Mount Daemon
Loaded: loaded (/etc/systemd/system/nfs-mountd.service; enabled; vendor preset: enabled)
Active: active (running) since Tue 2019-08-20 03:19:01 UTC; 1min 21s ago
Main PID: 451 (rpc.mountd)
Tasks: 1 (limit: 271)
Memory: 736.0K
