[LTP] How to get detailed system information between running tests

[Xiaoguang W. <wan...@cn...>]

Hi,

Recently I met some fails in RHEL7.0Beta by running "./runltp", the fails are below:
   ------------------------------------------
           hugemmap01 FAIL 2
           hugemmap03 FAIL 2
           hugemmap04 FAIL 2
 ------------------------------------------
After some investigation, I found that it is "echo 128 > /proc/sys/vm/nr_hugepages" causing
these fails. By catting /proc/buddyinfo  or catting /proc/pagetypeinfo, I found that the system
has too many memory fragments and was not able to allocate 128 hugepages. So I also want
to know which test cases results in these too many memory fragments.

It seems that LTP does not provide a method to get the system's status information between these
tests. I think we may add patches to support providing a shell script to ltp-pan, which will be called before
and after every test case, to record some system status information. In this shell script, you can collect
system information you has interests in, then save these information to files. Then we can analysis these
files to know which case causing the big system status changes.

Anybody has some better ideas, thanks.

Regards,
Xiaoguang Wang