Description of problem: xend, xenstored are consuming too much CPU


Version-Release number of selected component (if applicable): RHEL5.1
xen-libs-3.0.3-41.el5
kernel-xen-2.6.18-53.el5
kernel-xen-devel-2.6.18-53.el5
xen-3.0.3-41.el5


How reproducible:
just loop on "xm list" command leads xend and xenstored to use a lot of CPU time

Steps to Reproduce:
1. execute the following command:
 while true; do xm list; usleep 5000;done
 
Actual results:
top command displays xend and xenstored consuming more than 50% of CPU time.

Expected results:


Additional info:
strace()'ing the xenstored process gives:

# strace -p 2647 -e trace=open,rename,unlink
Process 2647 attached - interrupt to quit
open("/var/lib/xenstored/tdb.0x6000000000027040", O_WRONLY|O_CREAT|O_TRUNC,
0640) = 1
open("/var/lib/xenstored/tdb.0x6000000000027040", O_RDWR) = 18
rename("/var/lib/xenstored/tdb.0x6000000000027040", "/var/lib/xenstored/tdb") = 0
unlink("/var/lib/xenstored/tdb.0x6000000000027040") = -1 ENOENT (No such file or
directory)
...
repeated 16 times per listed domain!