linux-kernel - [PATCH v5 0/5] Delay the initializaton of zswap

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Date:   Thu, 15 Sep 2022 11:49:58 +0800
From:   Liu Shixin <liushixin2@...wei.com>
To:     Seth Jennings <sjenning@...hat.com>,
        Dan Streetman <ddstreet@...e.org>,
        Vitaly Wool <vitaly.wool@...sulko.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Nathan Chancellor <nathan@...nel.org>,
        "Christoph Hellwig" <hch@....de>
CC:     <linux-mm@...ck.org>, <linux-kernel@...r.kernel.org>,
        Liu Shixin <liushixin2@...wei.com>,
        Kefeng Wang <wangkefeng.wang@...wei.com>
Subject: [PATCH v5 0/5] Delay the initializaton of zswap

In the initialization of zswap, about 18MB memory will be allocated for       
zswap_pool. Since not all users use zswap, the memory may be wasted. Save  
the memory for these users by delaying the initialization of zswap to         
first enablement.                                                             

v4->v5: Rebase on next-20220913, the previous first patch is superseded
by patch ("frontswap: don't call ->init if no ops are registered").
v3->v4: Revert three patches to replace previous patch[1-2] suggested by
Vitaly.
v2->v3: Fix frontswap_ops NULL reported by Nathan and add init for online
swap device in backend register.
v1->v2: Change init_zswap to zswap_init suggested by Andrew.

Liu Shixin (5):
  Revert "mm: mark swap_lock and swap_active_head static"
  Revert "frontswap: simplify frontswap_register_ops"
  mm/zswap: replace zswap_init_{started/failed} with zswap_init_state
  mm/zswap: delay the initializaton of zswap until the first enablement
  mm/zswap: skip confusing print info

 include/linux/swapfile.h |  2 ++
 mm/frontswap.c           | 42 ++++++++++++++++++++++
 mm/swapfile.c            |  4 +--
 mm/zswap.c               | 77 ++++++++++++++++++++++++++++++----------
 4 files changed, 104 insertions(+), 21 deletions(-)

-- 
2.25.1