On 21 Jul 2021, at 2:39, Huang Ying wrote: > From: Dave Hansen <dave.hansen@xxxxxxxxxxxxxxx> > > Anonymous pages are kept on their own LRU(s). These lists could > theoretically always be scanned and maintained. But, without swap, there > is currently nothing the kernel can *do* with the results of a scanned, > sorted LRU for anonymous pages. > > A check for '!total_swap_pages' currently serves as a valid check as to > whether anonymous LRUs should be maintained. However, another method will > be added shortly: page demotion. > > Abstract out the 'total_swap_pages' checks into a helper, give it a > logically significant name, and check for the possibility of page > demotion. > > Link: https://lkml.kernel.org/r/20210715055145.195411-7-ying.huang@xxxxxxxxx > Signed-off-by: Dave Hansen <dave.hansen@xxxxxxxxxxxxxxx> > Signed-off-by: "Huang, Ying" <ying.huang@xxxxxxxxx> > Reviewed-by: Yang Shi <shy828301@xxxxxxxxx> > Reviewed-by: Greg Thelen <gthelen@xxxxxxxxxx> > Cc: Michal Hocko <mhocko@xxxxxxxx> > Cc: Wei Xu <weixugc@xxxxxxxxxx> > Cc: Oscar Salvador <osalvador@xxxxxxx> > Cc: Zi Yan <ziy@xxxxxxxxxx> > Cc: David Rientjes <rientjes@xxxxxxxxxx> > Cc: Dan Williams <dan.j.williams@xxxxxxxxx> > Cc: David Hildenbrand <david@xxxxxxxxxx> > Cc: Keith Busch <kbusch@xxxxxxxxxx> > Cc: Yang Shi <yang.shi@xxxxxxxxxxxxxxxxx> > Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> > --- > mm/vmscan.c | 20 ++++++++++++++++++-- > 1 file changed, 18 insertions(+), 2 deletions(-) > LGTM. Reviewed-by: Zi Yan <ziy@xxxxxxxxxx> — Best Regards, Yan, Zi
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