linux-kernel - Re: [RFC PATCH 0/2] remove SWAP_MAP

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Message-ID: <87jzf0ryab.fsf@yhuang6-desk2.ccr.corp.intel.com>
Date: Wed, 25 Sep 2024 15:24:28 +0800
From: "Huang, Ying" <ying.huang@...el.com>
To: Barry Song <21cnbao@...il.com>
Cc: Yosry Ahmed <yosryahmed@...gle.com>,  Nhat Pham <nphamcs@...il.com>,
  Baolin Wang <baolin.wang@...ux.alibaba.com>,  akpm@...ux-foundation.org,
  hannes@...xchg.org,  hughd@...gle.com,  shakeel.butt@...ux.dev,
  ryan.roberts@....com,  chrisl@...nel.org,  david@...hat.com,
  kasong@...cent.com,  willy@...radead.org,  viro@...iv.linux.org.uk,
  chengming.zhou@...ux.dev,  linux-mm@...ck.org,  kernel-team@...a.com,
  linux-kernel@...r.kernel.org
Subject: Re: [RFC PATCH 0/2] remove SWAP_MAP_SHMEM

Barry Song <21cnbao@...il.com> writes:

[snip]

> I am perfectly fine with the approach, in the first loop, if we find all entries
> don't need CONTINUED, we can run the 2nd loop even for usage==1
> and nr > 1. this is almost always true for a real product where anon folios
> are unlikely to be fork-shared by so many processes.

One possible use case is ksm.  Where the map count could be large.

--
Best Regards,
Huang, Ying