On Wed, Jan 25, 2017 at 04:08:02PM -0800, Andrew Morton wrote: > > + for_each_cpu(cpu, &cpus_with_pcps) { > > + struct work_struct *work = per_cpu_ptr(&pcpu_drain, cpu); > > + INIT_WORK(work, drain_local_pages_wq); > > It's strange to repeatedly run INIT_WORK() in this fashion. > Overwriting an atomic_t which should already be zero, initializing a > list_head which should already be in the initialized state... > > Can we instead do this a single time in init code? > INIT_WORK does different things depending on whether LOCKDEP is enabled or not and also whether object debugging is enabled. I'd worry that it's not functionally equivalent or some future change would break the assumptions about what INIT_WORK does internally. The init cost is there, but it's insignicant in comparison to the whole workqueue operation or the old cost of sending IPIs for that matter. -- Mel Gorman SUSE Labs -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx"> email@xxxxxxxxx </a>