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/TzRq+PSTEtCIrHz3i/ewIEkuA2m6/mak+9i6jI5pxBuoytg= X-Bogosity: Ham, tests=bogofilter, spamicity=0.000007, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: Hello Gang, On Tue, Mar 05, 2024 at 10:49:47AM +0800, Gang Li wrote: > On 2024/2/28 05:24, Daniel Jordan wrote: > > On Thu, Feb 22, 2024 at 10:04:17PM +0800, Gang Li wrote: > > > @@ -517,7 +518,16 @@ void __init padata_do_multithreaded(struct padata_mt_job *job) > > > ps.chunk_size = roundup(ps.chunk_size, job->align); > > > list_for_each_entry(pw, &works, pw_list) > > > - queue_work(system_unbound_wq, &pw->pw_work); > > > + if (job->numa_aware) { > > > + int old_node = atomic_read(&last_used_nid); > > > + > > > + do { > > > + nid = next_node_in(old_node, node_states[N_CPU]); > > > + } while (!atomic_try_cmpxchg(&last_used_nid, &old_node, nid)); > > > > There aren't concurrent NUMA-aware _do_multithreaded calls now, so an > > atomic per work seems like an unnecessary expense for guarding against > > Hi Daniel, > > Yes, this is not necessary. But I think this operation is infrequent, so > the burden shouldn't be too great? I can only guess, but I bet you're right. It's also that people might wonder what the atomic guards against, so non-atomic would make the code a bit easier to understand. Either way, looks fine. Acked-by: Daniel Jordan