linux-kernel - Re: [PATCH v10] mm: vmscan: try to reclaim swapcache pages if no swap space

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Message-ID: <ZWDPuR5Ssx07nBHb@tiehlicka>
Date:   Fri, 24 Nov 2023 17:30:49 +0100
From:   Michal Hocko <mhocko@...e.com>
To:     "Huang, Ying" <ying.huang@...el.com>
Cc:     Yosry Ahmed <yosryahmed@...gle.com>,
        Liu Shixin <liushixin2@...wei.com>,
        Yu Zhao <yuzhao@...gle.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Sachin Sant <sachinp@...ux.ibm.com>,
        Johannes Weiner <hannes@...xchg.org>,
        Kefeng Wang <wangkefeng.wang@...wei.com>, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v10] mm: vmscan: try to reclaim swapcache pages if no
 swap space

On Thu 23-11-23 14:15:59, Huang, Ying wrote:
> Michal Hocko <mhocko@...e.com> writes:
[...]
> > Yes swapcache pages are indeed more complicated but most of the time
> > they just go away as well, no?
> 
> When we swapin a page, we will put it in swapcache too.  And the page
> can be in that state for long time if there is more than 50% free space
> in the swap device.

True, but why is that a problem? If you encounter such a swapped in page
on the file LRU then the page should be referened and as such should be
activated, no?
-- 
Michal Hocko
SUSE Labs