Re: [SLUB] nfs_page cmpxchg_double_fail and perf lock perturbation on dual-socket NFS/RDMA

[Peter Zijlstra]

On Thu, Sep 17, 2026 at 03:10:47PM +0100, Harry Yoo wrote:
> ... now I realize we need to add PERFORMANCE EVENTS SUBSYSTEM folks 
> as well ;-)
> 
> Hmm, sounds like perf lock is somehow triggering slab allocations
> and interfering the workload.

perf should not have runtime memory allocation, its build to run from
NMI context. It can allocate some memory on event creation and the like,
but once its on, there should be no more allocations happening.