mm/page_alloc: track range of active PCP lists during bulk free

mm/page_alloc: track range of active PCP lists during bulk free

free_pcppages_bulk() frees pages in a round-robin fashion.  Originally,
this was dealing only with migratetypes but storing high-order pages
means that there can be many more empty lists that are uselessly
checked.  Track the minimum and maximum active pindex to reduce the
search space.

Link: https://lkml.kernel.org/r/20220217002227.5739-3-mgorman@techsingularity.net
Signed-off-by: Mel Gorman <mgorman@techsingularity.net>
Reviewed-by: Vlastimil Babka <vbabka@suse.cz>
Tested-by: Aaron Lu <aaron.lu@intel.com>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: Jesper Dangaard Brouer <brouer@redhat.com>
Cc: Michal Hocko <mhocko@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>