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

[Li Wang <li.wang@linux.dev>]

On Mon, Apr 27, 2026 at 01:57:28PM +0000, Wei Gao via ltp wrote:
> 
> > 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.

Ok, if that system does not support swap on purpose,
that we can do the skip.

Reviewed-by: Li Wang <li.wang@linux.dev>

-- 
Regards,
Li Wang

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