PSWPIN
mem_data->pswpin = ev[PSWPIN];
pages_to_bytes(events[PSWPIN]));
PSWPIN,
count_memcg_folio_events(folio, PSWPIN, folio_nr_pages(folio));
count_vm_events(PSWPIN, sio->pages);
count_memcg_folio_events(folio, PSWPIN, folio_nr_pages(folio));
count_vm_events(PSWPIN, folio_nr_pages(folio));
count_memcg_folio_events(folio, PSWPIN, folio_nr_pages(folio));
count_vm_events(PSWPIN, folio_nr_pages(folio));
[I(PSWPIN)] = "pswpin",