mm: shmem: skip swapcache for swapin of synchronous swap device

With fast swap devices (such as zram), swapin latency is crucial to
applications.  For shmem swapin, similar to anonymous memory swapin, we
can skip the swapcache operation to improve swapin latency.  Testing 1G
shmem sequential swapin without THP enabled, I observed approximately a 6%
performance improvement: (Note: I repeated 5 times and took the mean data
for each test)

w/o patch	w/ patch	changes
534.8ms		501ms		+6.3%

In addition, currently, we always split the large swap entry stored in the
shmem mapping during shmem large folio swapin, which is not perfect,
especially with a fast swap device.  We should swap in the whole large
folio instead of splitting the precious large folios to take advantage of
the large folios and improve the swapin latency if the swap device is
synchronous device, which is similar to anonymous memory mTHP swapin. 
Testing 1G shmem sequential swapin with 64K mTHP and 2M mTHP, I observed
obvious performance improvement:

mTHP=64K
w/o patch	w/ patch	changes
550.4ms		169.6ms		+69%

mTHP=2M
w/o patch	w/ patch	changes
542.8ms		126.8ms		+77%

Note that skipping swapcache requires attention to concurrent swapin
scenarios.  Fortunately the swapcache_prepare() and
shmem_add_to_page_cache() can help identify concurrent swapin and large
swap entry split scenarios, and return -EEXIST for retry.

[akpm@linux-foundation.org: use IS_ENABLED(), tweak comment grammar]
Link: https://lkml.kernel.org/r/3d9f3bd3bc6ec953054baff5134f66feeaae7c1e.1736301701.git.baolin.wang@linux.alibaba.com


Signed-off-by: Baolin Wang <baolin.wang@linux.alibaba.com>
Cc: David Hildenbrand <david@redhat.com>
Cc: "Huang, Ying" <ying.huang@linux.alibaba.com>
Cc: Hugh Dickins <hughd@google.com>
Cc: Kairui Song <kasong@tencent.com>
Cc: Kefeng Wang <wangkefeng.wang@huawei.com>
Cc: Matthew Wilcox (Oracle) <willy@infradead.org>
Cc: Ryan Roberts <ryan.roberts@arm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>