On 6/16/20 8:16 AM, js1304@xxxxxxxxx wrote: > From: Joonsoo Kim <iamjoonsoo.kim@xxxxxxx> > > With synchronous IO swap device, swap-in is directly handled in fault > code. Since IO cost notation isn't added there, with synchronous IO swap > device, LRU balancing could be wrongly biased. Fix it to count it > in fault code. > > Signed-off-by: Joonsoo Kim <iamjoonsoo.kim@xxxxxxx> Acked-by: Vlastimil Babka <vbabka@xxxxxxx> > --- > mm/memory.c | 8 ++++++++ > 1 file changed, 8 insertions(+) > > diff --git a/mm/memory.c b/mm/memory.c > index bc6a471..3359057 100644 > --- a/mm/memory.c > +++ b/mm/memory.c > @@ -3143,6 +3143,14 @@ vm_fault_t do_swap_page(struct vm_fault *vmf) > if (err) > goto out_page; > > + /* > + * XXX: Move to lru_cache_add() when it > + * supports new vs putback > + */ > + spin_lock_irq(&page_pgdat(page)->lru_lock); > + lru_note_cost_page(page); > + spin_unlock_irq(&page_pgdat(page)->lru_lock); > + > lru_cache_add(page); > swap_readpage(page, true); > } >
