linux-kernel - Re: [PATCH v5 05/10] mm/swap: charge the page when adding to the swap cache

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Date:   Tue, 7 Apr 2020 09:42:54 +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>
Subject: Re: [PATCH v5 05/10] mm/swap: charge the page when adding to the swap cache

2020년 4월 6일 (월) 오후 8:58, Hillf Danton <hdanton@...a.com>님이 작성:
>
>
> On Fri,  3 Apr 2020 14:40:43 +0900 Joonsoo Kim wrote:
> >
> > @@ -153,11 +165,16 @@ int add_to_swap_cache(struct page *page, swp_entry_t entry,
> >               xas_unlock_irq(&xas);
> >       } while (xas_nomem(&xas, gfp));
> >
> > -     if (!xas_error(&xas))
> > +     if (!xas_error(&xas)) {
> > +             mem_cgroup_commit_charge(page, memcg, false, compound);
>
> Add a tp
>                 trace_mm_add_to_swap_cache(page);

Please let me know the reason of this comment. IMO, adding a tracepoint isn't
good idea until it is really necessary since it is considered as
kernel ABI and it
cannot be changed easily.

Thanks.