High CPU Load

HI

I am running Xen-PV with SolusVM on Centos 6 and hosting about 11 Virtual machines. 5. Since yesterday the cpu load on my host machine goes very high and reaches between 28-35. Connecting with SSH becomes very hard. I run top command but did not find any processes taking very high CPU.
I am puzzled. I also ran xm top command (screenshot attached).
Also /var/log/messages show below message:

Oct 19 16:47:01 slave-wahad kernel: audit: audit_backlog=321 > audit_backlog_limit=320
Oct 19 16:47:01 slave-wahad kernel: audit: audit_lost=150 audit_rate_limit=0 audit_backlog_limit=320
Oct 19 16:47:01 slave-wahad kernel: audit: backlog limit exceeded
Oct 19 16:47:01 slave-wahad kernel: audit: audit_backlog=321 > audit_backlog_limit=320
Oct 19 16:47:01 slave-wahad kernel: audit: audit_lost=151 audit_rate_limit=0 audit_backlog_limit=320
Oct 19 16:47:01 slave-wahad kernel: audit: backlog limit exceeded
Oct 19 16:47:01 slave-wahad kernel: audit: audit_backlog=321 > audit_backlog_limit=320
Oct 19 16:47:01 slave-wahad kernel: audit: audit_lost=152 audit_rate_limit=0 audit_backlog_limit=320
Oct 19 16:47:01 slave-wahad kernel: audit: backlog limit exceeded
Oct 19 16:47:01 slave-wahad kernel: audit: audit_backlog=321 > audit_backlog_limit=320
Oct 19 16:47:20 slave-wahad kernel: audit_log_start: 2 callbacks suppressed
Oct 19 16:47:20 slave-wahad kernel: audit: audit_backlog=321 > audit_backlog_limit=320
Oct 19 16:47:20 slave-wahad kernel: audit: audit_lost=154 audit_rate_limit=0 audit_backlog_limit=320
Oct 19 16:47:20 slave-wahad kernel: audit: backlog limit exceeded
Oct 19 16:47:20 slave-wahad kernel: audit: audit_backlog=321 > audit_backlog_limit=320
Oct 19 16:47:20 slave-wahad kernel: audit: audit_lost=155 audit_rate_limit=0 audit_backlog_limit=320
Oct 19 16:47:20 slave-wahad kernel: audit: backlog limit exceeded
Oct 19 16:47:20 slave-wahad kernel: audit: audit_backlog=321 > audit_backlog_limit=320
Oct 19 16:47:20 slave-wahad kernel: audit: audit_lost=156 audit_rate_limit=0 audit_backlog_limit=320
Oct 19 16:47:20 slave-wahad kernel: audit: backlog limit exceeded
Oct 19 16:47:20 slave-wahad kernel: audit: audit_backlog=321 > audit_backlog_limit=320

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and

# aureport --start today --event --summary -i

Event Summary Report
======================
total  type
======================
6751  NETFILTER_CFG
1470  USER_START
1462  LOGIN
1462  USER_ACCT
1462  CRED_ACQ
1446  USER_END
1445  CRED_DISP
1415  CRYPTO_KEY_USER
748  USER_AUTH
584  CRYPTO_SESSION
538  USER_LOGIN
265  USER_ERR
11  ANOM_PROMISCUOUS
8  CRED_REFR
2  USER_LOGOUT
1  CONFIG_CHANGE

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I would be really thankful if someone can please help me identify what is causing this high CPU load.
Screen-Shot-2015-10-19-at-8.42.17-PM.png