Re: [PATCH 09/28] hazptrtorture: Add READERS4 and READERS0 torture configs

[KunWu Chan]

On Wed, Nov 11, 2026 at 5:37 AM Paul E. McKenney <paulmck@xxxxxxxxxx> wrote:
>
> On Thu, Nov 05, 2026 at 12:54:27AM +0800, Kunwu Chan wrote:
> > Add READERS4 and READERS0 configs to cover reader-active and
> > reader-free synchronize paths.
> >
> > Both use the PREEMPT baseline and hazptr-stack torture type,
> > with four readers for READERS4 and no readers for READERS0.
> >
> > Signed-off-by: Kunwu Chan <kunwu.chan@xxxxxxxxx>
>
> For these, why not just add '--bootargs "hazptrtorture.nreaders=0"'
> to the kvm.sh command line, for example in torture.sh?  Ditto for the
> four-readers case.
>
Hi Paul,

Agreed. I wanted to keep the zero- and four-reader cases as
explicit, repeatable tests. I'll drop the separate configs and
retain them as scripted PREEMPT runs, passing nreaders=0 or 4
and torture_type=hazptr-stack through --bootargs.

Thanks,
Kunwu

>                                                         Thanx, Paul
>
> > Acked-by: Bradley Morgan <brads@xxxxxxxxxxxxxx>
> > ---
> >  .../selftests/rcutorture/configs/hazptr/READERS0 | 16 ++++++++++++++++
> >  .../rcutorture/configs/hazptr/READERS0.boot      |  2 ++
> >  .../selftests/rcutorture/configs/hazptr/READERS4 | 16 ++++++++++++++++
> >  .../rcutorture/configs/hazptr/READERS4.boot      |  2 ++
> >  4 files changed, 36 insertions(+)
> >  create mode 100644 tools/testing/selftests/rcutorture/configs/hazptr/READERS0
> >  create mode 100644 tools/testing/selftests/rcutorture/configs/hazptr/READERS0.boot
> >  create mode 100644 tools/testing/selftests/rcutorture/configs/hazptr/READERS4
> >  create mode 100644 tools/testing/selftests/rcutorture/configs/hazptr/READERS4.boot
> >
> > diff --git a/tools/testing/selftests/rcutorture/configs/hazptr/READERS0 b/tools/testing/selftests/rcutorture/configs/hazptr/READERS0
> > new file mode 100644
> > index 000000000000..c5b12f3bef74
> > --- /dev/null
> > +++ b/tools/testing/selftests/rcutorture/configs/hazptr/READERS0
> > @@ -0,0 +1,16 @@
> > +CONFIG_SMP=y
> > +CONFIG_NR_CPUS=16
> > +CONFIG_PREEMPT_NONE=n
> > +CONFIG_PREEMPT_VOLUNTARY=n
> > +CONFIG_PREEMPT=y
> > +CONFIG_HZ_PERIODIC=n
> > +CONFIG_NO_HZ_IDLE=y
> > +CONFIG_NO_HZ_FULL=n
> > +CONFIG_HOTPLUG_CPU=y
> > +CONFIG_SUSPEND=n
> > +CONFIG_HIBERNATION=n
> > +CONFIG_DEBUG_LOCK_ALLOC=n
> > +CONFIG_PROVE_LOCKING=n
> > +CONFIG_DEBUG_OBJECTS_RCU_HEAD=n
> > +CONFIG_DEBUG_KERNEL=y
> > +CONFIG_HAZPTR_DEBUG=y
> > diff --git a/tools/testing/selftests/rcutorture/configs/hazptr/READERS0.boot b/tools/testing/selftests/rcutorture/configs/hazptr/READERS0.boot
> > new file mode 100644
> > index 000000000000..f5564c218902
> > --- /dev/null
> > +++ b/tools/testing/selftests/rcutorture/configs/hazptr/READERS0.boot
> > @@ -0,0 +1,2 @@
> > +hazptrtorture.nreaders=0
> > +hazptrtorture.torture_type=hazptr-stack
> > diff --git a/tools/testing/selftests/rcutorture/configs/hazptr/READERS4 b/tools/testing/selftests/rcutorture/configs/hazptr/READERS4
> > new file mode 100644
> > index 000000000000..c5b12f3bef74
> > --- /dev/null
> > +++ b/tools/testing/selftests/rcutorture/configs/hazptr/READERS4
> > @@ -0,0 +1,16 @@
> > +CONFIG_SMP=y
> > +CONFIG_NR_CPUS=16
> > +CONFIG_PREEMPT_NONE=n
> > +CONFIG_PREEMPT_VOLUNTARY=n
> > +CONFIG_PREEMPT=y
> > +CONFIG_HZ_PERIODIC=n
> > +CONFIG_NO_HZ_IDLE=y
> > +CONFIG_NO_HZ_FULL=n
> > +CONFIG_HOTPLUG_CPU=y
> > +CONFIG_SUSPEND=n
> > +CONFIG_HIBERNATION=n
> > +CONFIG_DEBUG_LOCK_ALLOC=n
> > +CONFIG_PROVE_LOCKING=n
> > +CONFIG_DEBUG_OBJECTS_RCU_HEAD=n
> > +CONFIG_DEBUG_KERNEL=y
> > +CONFIG_HAZPTR_DEBUG=y
> > diff --git a/tools/testing/selftests/rcutorture/configs/hazptr/READERS4.boot b/tools/testing/selftests/rcutorture/configs/hazptr/READERS4.boot
> > new file mode 100644
> > index 000000000000..0d0df3f7dca4
> > --- /dev/null
> > +++ b/tools/testing/selftests/rcutorture/configs/hazptr/READERS4.boot
> > @@ -0,0 +1,2 @@
> > +hazptrtorture.nreaders=4
> > +hazptrtorture.torture_type=hazptr-stack
> > --
> > 2.43.0
> >