linux-kernel - [PATCH 0/5] mm/zswap: dstmem reuse optimizations and cleanups

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Date:   Wed, 13 Dec 2023 04:17:57 +0000
From:   Chengming Zhou <zhouchengming@...edance.com>
To:     Andrew Morton <akpm@...ux-foundation.org>,
        Nhat Pham <nphamcs@...il.com>, Chris Li <chriscli@...gle.com>,
        Johannes Weiner <hannes@...xchg.org>,
        Seth Jennings <sjenning@...hat.com>,
        Dan Streetman <ddstreet@...e.org>,
        Vitaly Wool <vitaly.wool@...sulko.com>,
        Yosry Ahmed <yosryahmed@...gle.com>
Cc:     Nhat Pham <nphamcs@...il.com>, linux-kernel@...r.kernel.org,
        linux-mm@...ck.org, Chengming Zhou <zhouchengming@...edance.com>
Subject: [PATCH 0/5] mm/zswap: dstmem reuse optimizations and cleanups

Hi everyone,

This series is split from [1] to only include zswap dstmem reuse
optimizations and cleanups, the other part of rbtree breakdown will
be deferred to retest after the rbtree converted to xarray.

And the problem this series tries to optimize is that zswap_load()
and zswap_writeback_entry() have to malloc a temporary memory to
support !zpool_can_sleep_mapped(). We can avoid it by reusing the
percpu crypto_acomp_ctx->dstmem, which is also used by zswap_store()
and protected by the same percpu crypto_acomp_ctx->mutex.

[1] https://lore.kernel.org/all/20231206-zswap-lock-optimize-v1-0-e25b059f9c3a@bytedance.com/

Signed-off-by: Chengming Zhou <zhouchengming@...edance.com>
---
Chengming Zhou (5):
      mm/zswap: reuse dstmem when decompress
      mm/zswap: change dstmem size to one page
      mm/zswap: refactor out __zswap_load()
      mm/zswap: cleanup zswap_load()
      mm/zswap: cleanup zswap_reclaim_entry()

 mm/zswap.c | 158 +++++++++++++++++++------------------------------------------
 1 file changed, 49 insertions(+), 109 deletions(-)
---
base-commit: 1f242c1964cf9b8d663a2fd72159b296205a8126
change-id: 20231213-zswap-dstmem-d828f563303d

Best regards,
-- 
Chengming Zhou <zhouchengming@...edance.com>