[LTP] [PATCH v5 1/2] mem/tunable: new testcase about overcommiting memory

[Zhouping L. <zl...@re...>]

Hi, Cyril & Garrett
v4 -> v5: updated message.
please feel free to comment.

There are several vm tunable files under /proc/sys/vm, I will compose
some cases for testing the basic functions of them. This patch is adding
the read/write/check functions to mem lib so that I can include them in
my testcases.

set_sys_tune():   set a long long integer value to a vm tunable file.
get_sys_tune():   get a long long integer value from a vm tunable file.
check_sys_tune(): check to confirm the value in tunable file meets our
                  expectation.
read_meminfo():   read the special value from /proc/meminfo.

Since most of the values in vm tunable files contain only single
integer, the functions I added only read/write long long values for now.
For those files not storing single interger (e.g. lowmem_reserve_ratio),
these functions will not be used in the case.

Signed-off-by: Zhouping Liu <zl...@re...>
---
 testcases/kernel/mem/include/mem.h |    7 +++
 testcases/kernel/mem/lib/mem.c     |   81 +++++++++++++++++++++++++++++++++++-
 2 files changed, 87 insertions(+), 1 deletions(-)

-- 
Thanks,
Zhouping Liu