mm/zsmalloc: change back to per-size_class lock

Patch series "mm/zsmalloc: change back to per-size_class lock, v2".

Commit c0547d0b6a4b ("zsmalloc: consolidate zs_pool's migrate_lock and
size_class's locks") changed per-size_class lock to pool spinlock to
prepare reclaim support in zsmalloc.  Then reclaim support in zsmalloc had
been dropped in favor of LRU reclaim in zswap, but this locking change had
been left there.

Obviously, the scalability of pool spinlock is worse than per-size_class. 
And we have a workaround that using 32 pools in zswap to avoid this
scalability problem, which brings its own problems like memory waste and
more memory fragmentation.

So this series changes back to use per-size_class lock and using testing
data in much stressed situation to verify that we can use only one pool in
zswap.  Note we only test and care about the zsmalloc backend, which makes
sense now since zsmalloc became a lot more popular than other backends.

Testing kernel build (make bzImage -j32) on tmpfs with memory.max=1GB, and
zswap shrinker enabled with 10GB swapfile on ext4.

				real	user    sys
6.10.0-rc3			138.18	1241.38 1452.73
6.10.0-rc3-onepool		149.45	1240.45 1844.69
6.10.0-rc3-onepool-perclass	138.23	1242.37 1469.71

We can see from "sys" column that per-size_class locking with only one
pool in zswap can have near performance with the current 32 pools.


This patch (of 2):

This patch is almost the revert of the commit c0547d0b6a4b ("zsmalloc:
consolidate zs_pool's migrate_lock and size_class's locks"), which changed
to use a global pool->lock instead of per-size_class lock and
pool->migrate_lock, was preparation for suppporting reclaim in zsmalloc. 
Then reclaim in zsmalloc had been dropped in favor of LRU reclaim in
zswap.

In theory, per-size_class is more fine-grained than the pool->lock, since
a pool can have many size_classes.  As for the additional
pool->migrate_lock, only free() and map() need to grab it to access stable
handle to get zspage, and only in read lock mode.

Link: https://lkml.kernel.org/r/20240625-zsmalloc-lock-mm-everything-v3-0-ad941699cb61@linux.dev
Link: https://lkml.kernel.org/r/20240621-zsmalloc-lock-mm-everything-v2-0-d30e9cd2b793@linux.dev
Link: https://lkml.kernel.org/r/20240617-zsmalloc-lock-mm-everything-v1-0-5e5081ea11b3@linux.dev
Link: https://lkml.kernel.org/r/20240617-zsmalloc-lock-mm-everything-v1-1-5e5081ea11b3@linux.dev
Signed-off-by: Chengming Zhou <zhouchengming@bytedance.com>
Reviewed-by: Sergey Senozhatsky <senozhatsky@chromium.org>
Cc: Chengming Zhou <chengming.zhou@linux.dev>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Minchan Kim <minchan@kernel.org>
Cc: Nhat Pham <nphamcs@gmail.com>
Cc: Yosry Ahmed <yosryahmed@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

0 files changed, 0 insertions, 0 deletions