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v5: Rebase on next-20220913, the previous first patch is superseded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
