Merge pull request !4 from nocjj/master

default to display in curse mode, and add -b option
to switch to text mode.
Signed-off-by: NJiajun Chen <1250062498@qq.com>

FAQ: explanation of some terms
TODO: something to do in future
HOWTO: ways to devalop
Signed-off-by: NJiajun Chen <1250062498@qq.com>

Add enable-debug option ad secure-build option to configure.ac.
enable-debug: add "-g -O0" to CFLAGS
secure-build: add secure compile option
Signed-off-by: NJiajun Chen <1250062498@qq.com>

Add English README for project.
Signed-off-by: NJiajun Chen <1250062498@qq.com>

Add "-n" option to set run times, default to unlimited.
Signed-off-by: NJiajun Chen <1250062498@qq.com>

Default not show threads info, but show domains summary info.
To open threads mode, press 'H' or add "-H" while stat vmtop.
Signed-off-by: NJiajun Chen <1250062498@qq.com>

Add three display items to vmtop
%ST: steal time
%GUE: guest time
%HYP: CPU usage of virtual
Signed-off-by: NJiajun Chen <1250062498@qq.com>

If the display is out of bounds, the part beyond boundary
is no longer displayed. This is obviously a problem.

So add key up/down left/right to move the screen, and then the hidden
part can also be displayed.
Signed-off-by: NJiajun Chen <1250062498@qq.com>

Add width limit and height limit to display.
If display is out of range, do not display this task or field.
Signed-off-by: NJiajun Chen <1250062498@qq.com>

Add vcpu_stat related items to display, include:
EXThvc: hvc kvm exit
EXTWFE: wfe kvm exit
EXTwfi: wfi kvm exit
EXTmmioU: mmio User kvm exit
EXTmmioK: mmio Kernel kvm exit
EXTfp: FP ASIMD kvm exit
EXTirq: IRQ kvm exit
EXTsys64: SYS64 kvm  exit
EXTmabt: mem abort kvm exit
EXTsum: times of all kvm exit
Signed-off-by: NJiajun Chen <1250062498@qq.com>

Get kvm exits info for vcpu from /sys/kernel/debug/kvm/vcpu_stat.
Related openeuler kernel commits:
    bbb5023b977aa3ec08d142daa63c86e8e4da81ff
    5ae004462e253e23690b47692d514705223c0305
    167fbfb3d28c267d98064a36c95cee21cdfd2fa7
Signed-off-by: NJiajun Chen <1250062498@qq.com>

!2 vmtop: get process info from procfs and add CPU usage,  process state,  processor display item to vmtop
Merge pull request !2 from nocjj/master

Get threads list from /proc/pid/task, and refresh data for every thread.
Display threads info below domain info.
Signed-off-by: NJiajun Chen <1250062498@qq.com>

Calculation formula of CPU usage:
cpu_time = (utime_now + stime_now) - (utime_pre + stime_pre);
CPU usage = cpu_time / time_interval;

Get utime and stime from /proc/qemupid/stat, then we can get cpu_time
by calculate variation of these value over time.
And time_interval represent cpu time interval between two data acquisition.
Signed-off-by: NJiajun Chen <1250062498@qq.com>

Read /proc/qemupid/stat file to refresh process info,
include: parent pid, userspace time, task state and etc.
According to these data, add two display itemsi to vmtop:
S: task state
P: physical processor that task is runnning on
Signed-off-by: NJiajun Chen <1250062498@qq.com>

Merge pull request !1 from nocjj/master

vmtop is a userspace tool which you can run it in host
to help detecting VM's performance.
1. Implement the basic display framework, realize loop display
   and field filter. Press 'f' to enter field filter mode and
   press 'q' to quit.
2. Build compiling project by autotools.
3. Add Mulan license for project.
Signed-off-by: NJiajun Chen <1250062498@qq.com>