linux-kernel - Re: [PATCH 0/1] Add swappiness argument to memory.reclaim

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Message-ID: <ZWjabcWQm/GUoGTf@casper.infradead.org>
Date:   Thu, 30 Nov 2023 18:54:37 +0000
From:   Matthew Wilcox <willy@...radead.org>
To:     Shakeel Butt <shakeelb@...gle.com>
Cc:     Dan Schatzberg <schatzberg.dan@...il.com>,
        Johannes Weiner <hannes@...xchg.org>,
        Roman Gushchin <roman.gushchin@...ux.dev>,
        Yosry Ahmed <yosryahmed@...gle.com>, Huan Yang <link@...o.com>,
        linux-kernel@...r.kernel.org, cgroups@...r.kernel.org,
        linux-mm@...ck.org, Michal Hocko <mhocko@...nel.org>,
        Muchun Song <muchun.song@...ux.dev>,
        Andrew Morton <akpm@...ux-foundation.org>,
        David Hildenbrand <david@...hat.com>,
        Huang Ying <ying.huang@...el.com>,
        Kefeng Wang <wangkefeng.wang@...wei.com>,
        Peter Xu <peterx@...hat.com>,
        "Vishal Moola (Oracle)" <vishal.moola@...il.com>,
        Yue Zhao <findns94@...il.com>, Hugh Dickins <hughd@...gle.com>
Subject: Re: [PATCH 0/1] Add swappiness argument to memory.reclaim

On Thu, Nov 30, 2023 at 06:44:24PM +0000, Shakeel Butt wrote:
> On Thu, Nov 30, 2023 at 07:36:53AM -0800, Dan Schatzberg wrote:
> > * Swapout should be limited to manage SSD write endurance. In near-OOM
> 
> Is this about swapout to SSD only?

If you're using spinning rust with its limit of, what, 200 seeks per
second, I'd suggest that swapout should also be limited but for
different reasons.  We can set you up with a laptop with insufficient
RAM and a 5400rpm drive if you'd like to be convinced ...