On Mon, Oct 30, 2017 at 9:33 PM, Bart Van Assche <Bart.VanAssche@xxxxxxx> wrote: > On Fri, 2017-10-27 at 19:55 +0200, Roman Penyaev wrote: >> That's just a bug in code, not a in issue with restarts, which can be fixed >> if we put hctx which are needed to be restarted in percpu lists and avoid >> long loops and contentions. > > Hello Roman, > > Have you noticed that recently .get_budget() and .put_budget() callbacks have > been added into struct blk_mq_ops? If block drivers that support shared tags > implement these callback functions properly then maybe busy conditions become > infrequent enough to use a single "hctx busy" list per tag set instead of > per-cpu "hctx busy" lists. Hi Bart, No, not yet. Thanks, good tip. -- Roman
