[LTP] [PATCH v1] mmapstress06: TCONF on systems without swap space

[Wei Gao]

> Hi Wei,
> 
> Wei Gao via ltp wrote:
> 
> > mmapstress06 is designed to stress the mfile_swap kernel primitive, which
> > manages shared anonymous memory. On architectures with large pages (like
> > 64KB on ppc64le), the test's hardcoded request for 32769 pages results
> > in a ~2GB mapping. So in suse test system configured with 2GB of RAM and
> > no swap space, the test will fails with following information:
> > 
> > mmapstress06: errno = 12; large mmap failed
> > for this test to run, it needs a mmap space of
> > 32769 pages
> > 
> > The failure occurs because the 2GB request cannot be fulfilled within
> > the 2GB RAM limit without swap backing. Since the test specifically
> > intends to exercise swap-related logic (mfile_swap), it should be skipped
> > with TCONF when the system lacks swap space.
> 
> Since we do have MAKE_SWAPFILE_SIZE macros, I guess we could create
> a dedicated swap-file for the testing on those system?
Sorry forget mention this failure happen in our Immutable/Transactional 
systems test (default disable swap), i am not sure enable swap force do 
test is make sense or not.

@Petr Should we skip this test for transactional system?

> 
> And, it'd be appreciated if you can convert it into new LTP API.
No problem from my side.
> 
> -- 
> Regards,
> Li Wang