linux-kernel - Re: [External] Re: [PATCH] mm:zswap: fix zswap entry reclamation failure in two scenarios

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Date:   Fri, 17 Nov 2023 17:56:00 +0800
From:   Zhongkun He <hezhongkun.hzk@...edance.com>
To:     Chris Li <chriscli@...gle.com>
Cc:     Yosry Ahmed <yosryahmed@...gle.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Johannes Weiner <hannes@...xchg.org>,
        Nhat Pham <nphamcs@...il.com>,
        Seth Jennings <sjenning@...hat.com>,
        Dan Streetman <ddstreet@...e.org>,
        Vitaly Wool <vitaly.wool@...sulko.com>,
        linux-mm <linux-mm@...ck.org>,
        LKML <linux-kernel@...r.kernel.org>, Ying <ying.huang@...el.com>
Subject: Re: [External] Re: [PATCH] mm:zswap: fix zswap entry reclamation
 failure in two scenarios

>
> That will cancel the batching effect on the swap slot free, making the
> common case for  swapping  faults take longer to complete, righ?
> If I recall correctly, the uncharge is the expensive part of the swap
> slot free operation.
> I just want to figure out what we are trading off against. This is not
> one side wins all situations.
>

Hi Chris, thanks for your feedback.  I have the same concerns,
maybe we should just move the zswap_invalidate() out of batches,
as Yosry mentioned above.