Re: [RESEND PATCH 4/4] selftests/mm: transhuge_stress: skip the test when thp not available

[Lorenzo Stoakes (Oracle)]

On Fri, Mar 13, 2026 at 10:43:27AM +0800, Chunyu Hu wrote:
> On Thu, Mar 12, 2026 at 08:46:23PM +0100, David Hildenbrand (Arm) wrote:
> > On 3/12/26 12:40, Chunyu Hu wrote:
> > > The test requires thp, skip the test when thp is not available to avoid
> > > false positive.
> > >
> > > Tested with thp disabled kernel.
> > > Before the fix:
> > >   # --------------------------------
> > >   # running ./transhuge-stress -d 20
> > >   # --------------------------------
> > >   # TAP version 13
> > >   # 1..1
> > >   # transhuge-stress: allocate 1453 transhuge pages, using 2907 MiB virtual memory and 11 MiB of ram
> > >   # Bail out! MADV_HUGEPAGE# Planned tests != run tests (1 != 0)
> > >   # # Totals: pass:0 fail:0 xfail:0 xpass:0 skip:0 error:0
> > >   # [FAIL]
> > >   not ok 60 transhuge-stress -d 20 # exit=1
> > >
> > > After the fix:
> > >   # --------------------------------
> > >   # running ./transhuge-stress -d 20
> > >   # --------------------------------
> > >   # 1..0 # SKIP Transparent Hugepages not available
> > >   # [SKIP]
> > >   ok 5 transhuge-stress -d 20 # SKIP
> > >
> > > CC: Li Wang <liwang@xxxxxxxxxx>
> > > Signed-off-by: Chunyu Hu <chuhu@xxxxxxxxxx>
> > > ---
> > >  tools/testing/selftests/mm/transhuge-stress.c | 4 ++++
> > >  1 file changed, 4 insertions(+)
> > >
> > > diff --git a/tools/testing/selftests/mm/transhuge-stress.c b/tools/testing/selftests/mm/transhuge-stress.c
> > > index bcad47c09518..76316696426d 100644
> > > --- a/tools/testing/selftests/mm/transhuge-stress.c
> > > +++ b/tools/testing/selftests/mm/transhuge-stress.c
> > > @@ -17,6 +17,7 @@
> > >  #include <sys/mman.h>
> > >  #include "vm_util.h"
> > >  #include "kselftest.h"
> > > +#include "thp_settings.h"
> > >
> > >  int backing_fd = -1;
> > >  int mmap_flags = MAP_ANONYMOUS | MAP_NORESERVE | MAP_PRIVATE;
> > > @@ -35,6 +36,9 @@ int main(int argc, char **argv)
> > >  	int pagemap_fd;
> > >  	int duration = 0;
> > >
> > > +	if (!thp_is_enabled())
> > > +		ksft_exit_skip("Transparent Hugepages not available\n");
> > > +
> > >  	ksft_print_header();
> >
> > Shouldn't that go under the ksft_print_header(), like you did in patch #3?
>
> It will print the TAP version. I'll change in v2 as you suggested. Thanks!

With that done, LGTM and:

Reviewed-by: Lorenzo Stoakes (Oracle) <ljs@xxxxxxxxxx>

>
> >
> > --
> > Cheers,
> >
> > David
> >
>

Cheers, Lorenzo