On Fri, Apr 5, 2024 at 8:38 AM Klara Modin <klarasmodin@xxxxxxxxx> wrote: > > > > On 2024-04-05 17:20, Suren Baghdasaryan wrote: > > On Fri, Apr 5, 2024 at 7:30 AM Klara Modin <klarasmodin@xxxxxxxxx> wrote: > >> > >> On 2024-04-05 16:14, Suren Baghdasaryan wrote: > >>> On Fri, Apr 5, 2024 at 6:37 AM Klara Modin <klarasmodin@xxxxxxxxx> wrote: > >>>> If I enable this, I consistently get percpu allocation failures. I can > >>>> occasionally reproduce it in qemu. I've attached the logs and my config, > >>>> please let me know if there's anything else that could be relevant. > >>> > >>> Thanks for the report! > >>> In debug_alloc_profiling.log I see: > >>> > >>> [ 7.445127] percpu: limit reached, disable warning > >>> > >>> That's probably the reason. I'll take a closer look at the cause of > >>> that and how we can fix it. > >> > >> Thanks! > > > > In the build that produced debug_alloc_profiling.log I think we are > > consuming all the per-cpu memory reserved for the modules. Could you > > please try this change and see if that fixes the issue: > > > > include/linux/percpu.h | 2 +- > > 1 file changed, 1 insertion(+), 1 deletion(-) > > > > diff --git a/include/linux/percpu.h b/include/linux/percpu.h > > index a790afba9386..03053de557cf 100644 > > --- a/include/linux/percpu.h > > +++ b/include/linux/percpu.h > > @@ -17,7 +17,7 @@ > > /* enough to cover all DEFINE_PER_CPUs in modules */ > > #ifdef CONFIG_MODULES > > #ifdef CONFIG_MEM_ALLOC_PROFILING > > -#define PERCPU_MODULE_RESERVE (8 << 12) > > +#define PERCPU_MODULE_RESERVE (8 << 13) > > #else > > #define PERCPU_MODULE_RESERVE (8 << 10) > > #endif > > > > Yeah, that patch fixes the issue for me. > > Thanks, > Tested-by: Klara Modin Official fix is posted at https://lore.kernel.org/all/20240406214044.1114406-1-surenb@xxxxxxxxxx/ Thanks, Suren.
