On 4/22/21 1:14 PM, Mel Gorman wrote: > There is a lack of clarity of what exactly local_irq_save/local_irq_restore > protects in page_alloc.c . It conflates the protection of per-cpu page > allocation structures with per-cpu vmstat deltas. > > This patch protects the PCP structure using local_lock which for most > configurations is identical to IRQ enabling/disabling. The scope of the > lock is still wider than it should be but this is decreased later. > > It is possible for the local_lock to be embedded safely within struct > per_cpu_pages but it adds complexity to free_unref_page_list. > > [lkp@xxxxxxxxx: Make pagesets static] > Signed-off-by: Mel Gorman <mgorman@xxxxxxxxxxxxxxxxxxx> Acked-by: Vlastimil Babka <vbabka@xxxxxxx>
