linux-kernel - Re: [PATCH v5 02/10] mm/vmscan: protect the workingset on anonymous LRU

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Date:   Tue, 7 Apr 2020 09:40:43 +0900
From:   Joonsoo Kim <js1304@...il.com>
To:     Hillf Danton <hdanton@...a.com>
Cc:     Andrew Morton <akpm@...ux-foundation.org>,
        Linux Memory Management List <linux-mm@...ck.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Johannes Weiner <hannes@...xchg.org>,
        Michal Hocko <mhocko@...nel.org>,
        Hugh Dickins <hughd@...gle.com>,
        Minchan Kim <minchan@...nel.org>,
        Vlastimil Babka <vbabka@...e.cz>,
        Mel Gorman <mgorman@...hsingularity.net>, kernel-team@....com,
        Joonsoo Kim <iamjoonsoo.kim@....com>
Subject: Re: [PATCH v5 02/10] mm/vmscan: protect the workingset on anonymous LRU

2020년 4월 6일 (월) 오후 6:18, Hillf Danton <hdanton@...a.com>님이 작성:
>
>
> On Fri,  3 Apr 2020 14:40:40 +0900 Joonsoo Kim wrote:
> >
> > @@ -3093,11 +3093,10 @@ vm_fault_t do_swap_page(struct vm_fault *vmf)
> >       if (unlikely(page != swapcache && swapcache)) {
> >               page_add_new_anon_rmap(page, vma, vmf->address, false);
> >               mem_cgroup_commit_charge(page, memcg, false, false);
> > -             lru_cache_add_active_or_unevictable(page, vma);
> > +             lru_cache_add_inactive_or_unevictable(page, vma);
> >       } else {
> >               do_page_add_anon_rmap(page, vma, vmf->address, exclusive);
> >               mem_cgroup_commit_charge(page, memcg, true, false);
> > -             activate_page(page);
> >       }
> >
> >       swap_free(entry);
> ...
> > @@ -996,8 +996,6 @@ static enum page_references page_check_references(struct page *page,
> >               return PAGEREF_RECLAIM;
> >
> >       if (referenced_ptes) {
> > -             if (PageSwapBacked(page))
> > -                     return PAGEREF_ACTIVATE;
> >               /*
> >                * All mapped pages start out with page table
> >                * references from the instantiating fault, so we need
> > @@ -1020,7 +1018,7 @@ static enum page_references page_check_references(struct page *page,
> >               /*
> >                * Activate file-backed executable pages after first usage.
> >                */
> > -             if (vm_flags & VM_EXEC)
> > +             if ((vm_flags & VM_EXEC) && !PageSwapBacked(page))
> >                       return PAGEREF_ACTIVATE;
> >
> >               return PAGEREF_KEEP;
> > --
> > 2.7.4
>
> Both changes other than
> s/lru_cache_add_active_or_unevictable/lru_cache_add_inactive_or_unevictable/
> are likely worth their own seperate commits with a concise log.

IMO, all of the changes in this patch provides just one logical change
for LRU management
on anonymous page so it's better to be together.

Thanks.