Re: [PATCH v2 02/11] this_cpu_cmpxchg: ARM64: switch this_cpu_cmpxchg to locked, add _local function

[Christoph Lameter]

On Thu, 9 Feb 2023, Marcelo Tosatti wrote:

> Goal is to have vmstat_shepherd to transfer from
> per-CPU counters to global counters remotely. For this,
> an atomic this_cpu_cmpxchg is necessary.

The definition for this_cpu_functionality is that it is *not* incurring
atomic overhead and it was introduced to *avoid* the overhead of atomic
operations.

This sabotages this_cpu functionality,