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

[Wei Gao]

On Tue, Apr 28, 2026 at 06:34:15PM +0200, Petr Vorel wrote:
> Hi all,
> 
> > Hi all,
> 
> > > mmapstress06 is designed to stress the mfile_swap kernel primitive, which
> Uh, I overlooked "mfile_swap kernel primitive". Then the approach would make
> sense, but is it really true? mfile_swap does not exist any more, not even in a
> git log. Test was added in January 2003, e.g. even before 2.6.
> 
> > > 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:
> 
> I'm not really sure. if that's caused by missing swap or would it work on
> machine with RAM big enough which has swap disabled (I guess you retest with
> e.g. 8 GB RAM). Otherwise I'd prefer prefer to deal with errno ENOMEM (12)
> instead (as I pointed out previously).
> 

Base description/implementation of test case, The original test is "passive," merely creating a 
mapping and relying on external processes to trigger swapping(case has sleep_time parameter).
Further more, this case is "ghost test" for current kernel, it do mmap but never 
writes to it, so kernel never actually allocated memory, 
Together with current obsolete logic(test targets legcy mfile_swap) i suggest just delete 
it instead of wasting time patching(refactor) it. What do you think? @Petr @wang li?