Support using multiple zpools of the same type in zswap, for concurrency
purposes.  A fixed number of 32 zpools is suggested by this commit, which
was determined empirically.  It can be later changed or made into a config
option if needed.

On a setup with zswap and zsmalloc, comparing a single zpool to 32 zpools
shows improvements in the zsmalloc lock contention, especially on the swap
out path.

The following shows the perf analysis of the swapout path when 10
workloads are simultaneously reclaiming and refaulting tmpfs pages.  There
are some improvements on the swap in path as well, but less significant.

1 zpool:

 |--28.99%--zswap_frontswap_store
       |
       <snip>
       |
       |--8.98%--zpool_map_handle
       |     |
       |      --8.98%--zs_zpool_map
       |           |
       |            --8.95%--zs_map_object
       |                 |
       |                  --8.38%--_raw_spin_lock
       |                       |
       |                        --7.39%--queued_spin_lock_slowpath
       |
       |--8.82%--zpool_malloc
       |     |
       |      --8.82%--zs_zpool_malloc
       |           |
       |            --8.80%--zs_malloc
       |                 |
       |                 |--7.21%--_raw_spin_lock
       |                 |     |
       |                 |      --6.81%--queued_spin_lock_slowpath
       <snip>

32 zpools:

 |--16.73%--zswap_frontswap_store
       |
       <snip>
       |
       |--1.81%--zpool_malloc
       |     |
       |      --1.81%--zs_zpool_malloc
       |           |
       |            --1.79%--zs_malloc
       |                 |
       |                  --0.73%--obj_malloc
       |
       |--1.06%--zswap_update_total_size
       |
       |--0.59%--zpool_map_handle
       |     |
       |      --0.59%--zs_zpool_map
       |           |
       |            --0.57%--zs_map_object
       |                 |
       |                  --0.51%--_raw_spin_lock
       <snip>

Link: https://lkml.kernel.org/r/20230620194644.3142384-1-yosryahmed@google.comSigned-off-by: Yosry Ahmed <yosryahmed@google.com>
Suggested-by: Yu Zhao <yuzhao@google.com>
Acked-by: Chris Li (Google) <chrisl@kernel.org>
Reviewed-by: Nhat Pham <nphamcs@gmail.com>
Tested-by: Nhat Pham <nphamcs@gmail.com>
Cc: Dan Streetman <ddstreet@ieee.org>
Cc: Domenico Cerasuolo <cerasuolodomenico@gmail.com>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Cc: Seth Jennings <sjenning@redhat.com>
Cc: Vitaly Wool <vitaly.wool@konsulko.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>