Re: [RFC PATCH 03/30] Lazy percpu counters

Kent Overstreet
2022-09-01T14:32:36Z

On Thu, Sep 01, 2022 at 08:51:31AM +0200, Peter Zijlstra wrote:
> On Tue, Aug 30, 2022 at 02:48:52PM -0700, Suren Baghdasaryan wrote:
> > +static void lazy_percpu_counter_switch_to_pcpu(struct raw_lazy_percpu_counter *c)
> > +{
> > + u64 __percpu *pcpu_v = alloc_percpu_gfp(u64, GFP_ATOMIC|__GFP_NOWARN);
>
> Realize that this is incorrect when used under a raw_spinlock_t.

Can you elaborate?