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

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Message-ID: <20231130193956.GA543908@cmpxchg.org>
Date:   Thu, 30 Nov 2023 14:39:56 -0500
From:   Johannes Weiner <hannes@...xchg.org>
To:     Matthew Wilcox <willy@...radead.org>
Cc:     Shakeel Butt <shakeelb@...gle.com>,
        Dan Schatzberg <schatzberg.dan@...il.com>,
        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 06:54:37PM +0000, Matthew Wilcox wrote:
> 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 ...

^_^

Yeah, we don't enable disk swap on the hard drive hosts that are
left. This aspect is only about write endurance management on SSD
during proactive reclaim.