How to Convert Non-LVM to LVM ?

I want to convert below filesystems to LVM based in linux.I have free disk /dev/xvdb of 187G.

[root@localhost ~]# df -h
Filesystem            Size  Used Avail Use% Mounted on
/dev/xvda2            105G  4.3G   96G   5% /
/dev/xvda1             99M   25M   70M  26% /boot
tmpfs                 2.0G     0  2.0G   0% /dev/shm
[root@localhost ~]#

Please suggest me how to convert non-LVM to LVM.


[root@localhost ~]# fdisk -l

Disk /dev/xvda: 124.6 GB, 124695244800 bytes
255 heads, 63 sectors/track, 15160 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes

    Device Boot      Start         End      Blocks   Id  System
/dev/xvda1   *           1          13      104391   83  Linux
/dev/xvda2              14       14115   113274315   83  Linux
/dev/xvda3           14116       15160     8393962+  82  Linux swap / Solaris

Disk /dev/xvdb: 187.9 GB, 187904819200 bytes
255 heads, 63 sectors/track, 22844 cylinders