linux-kernel - Re: [PATCH v6 4/6] zsmalloc: Add a LRU to zs_pool to keep track of zspages in LRU order

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Message-ID: <Y3kGmZnkps8oZpPq@cmpxchg.org>
Date:   Sat, 19 Nov 2022 11:38:49 -0500
From:   Johannes Weiner <hannes@...xchg.org>
To:     Nhat Pham <nphamcs@...il.com>
Cc:     akpm@...ux-foundation.org, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org, minchan@...nel.org,
        ngupta@...are.org, senozhatsky@...omium.org, sjenning@...hat.com,
        ddstreet@...e.org, vitaly.wool@...sulko.com
Subject: Re: [PATCH v6 4/6] zsmalloc: Add a LRU to zs_pool to keep track of
 zspages in LRU order

On Fri, Nov 18, 2022 at 04:15:34PM -0800, Nhat Pham wrote:
> This helps determines the coldest zspages as candidates for writeback.
> 
> Signed-off-by: Nhat Pham <nphamcs@...il.com>

Acked-by: Johannes Weiner <hannes@...xchg.org>

This looks good to me. The ifdefs are higher than usual, but in this
case they actually really nicely annotate exactly which hunks need to
move to zswap (as CONFIG_ZPOOL == CONFIG_ZSWAP) when we unify the LRU!
zbud and z3fold don't have those helpful annotations (since they're
zswap-only to begin with), which will make their conversion a bit more
laborious. But zsmalloc can be a (rough) guiding template for them.

Thanks