On 2016/4/6 17:19, Vlastimil Babka wrote: > An important function for cpusets is cpuset_node_allowed(), which optimizes on > the fact if there's a single root CPU set, it must be trivially allowed. But > the check "nr_cpusets() <= 1" doesn't use the cpusets_enabled_key static key > the right way where static keys eliminate branching overhead with jump labels. > > This patch converts it so that static key is used properly. It's also switched > to the new static key API and the checking functions are converted to return > bool instead of int. We also provide a new variant __cpuset_zone_allowed() > which expects that the static key check was already done and they key was > enabled. This is needed for get_page_from_freelist() where we want to also > avoid the relatively slower check when ALLOC_CPUSET is not set in alloc_flags. > > Signed-off-by: Vlastimil Babka <vbabka@xxxxxxx> Looks good to me. Acked-by: Zefan Li <lizefan@xxxxxxxxxx> -- 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>