linux-kernel - Re: [PATCH v2] mm: swap: async free swap slot cache entries

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Message-ID: <a869aff64f69bd1e1318653559f4c32e9f0a4c08.camel@linux.intel.com>
Date: Tue, 06 Feb 2024 17:08:00 -0800
From: Tim Chen <tim.c.chen@...ux.intel.com>
To: Chris Li <chrisl@...nel.org>
Cc: "Huang, Ying" <ying.huang@...el.com>, Andrew Morton
 <akpm@...ux-foundation.org>, linux-kernel@...r.kernel.org,
 linux-mm@...ck.org,  Wei Xu <weixugc@...gle.com>, Yu
 Zhao <yuzhao@...gle.com>, Greg Thelen
 <gthelen@...gle.com>, Chun-Tse Shao <ctshao@...gle.com>, Suren
 Baghdasaryan <surenb@...gle.com>, Yosry
 Ahmed <yosryahmed@...gle.com>,  Brain Geffon
 <bgeffon@...gle.com>, Minchan Kim <minchan@...nel.org>, Michal Hocko
 <mhocko@...e.com>, Mel Gorman <mgorman@...hsingularity.net>, Nhat Pham
 <nphamcs@...il.com>, Johannes Weiner <hannes@...xchg.org>, Kairui Song
 <kasong@...cent.com>, Zhongkun He <hezhongkun.hzk@...edance.com>, Kemeng
 Shi <shikemeng@...weicloud.com>,  Barry Song <v-songbaohua@...o.com>
Subject: Re: [PATCH v2] mm: swap: async free swap slot cache entries

On Mon, 2024-02-05 at 11:10 -0800, Chris Li wrote:
> 
> 
> In our system, a really heavy swap load is rare and it means something
> is already wrong. At that point the app's SLO is likely at risk,
> regardless of long tail swap latency. It is already too late to
> address it at the swap fault end. We need to address the source of the
> problem which is swapping out too much.
> 
> 

Could some usage scenarios put more pressure on swap than your
usage scenario?  Say system with limited RAM and rely on zswap?

Tim