UPSTREAM: binder: use per-vma lock in page reclaiming

Use per-vma locking in the shrinker's callback when reclaiming pages,
similar to the page installation logic. This minimizes contention with
unrelated vmas improving performance. The mmap_sem is still acquired if
the per-vma lock cannot be obtained.

Cc: Suren Baghdasaryan <surenb@google.com>
Suggested-by: Liam R. Howlett <Liam.Howlett@oracle.com>
Reviewed-by: Suren Baghdasaryan <surenb@google.com>
Signed-off-by: Carlos Llamas <cmllamas@google.com>
Link: https://lore.kernel.org/r/20241210143114.661252-10-cmllamas@google.com


Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

Bug: 410746221
Bug: 451778078
(cherry picked from commit 95bc2d4a)
Change-Id: I11d07a05e06f837dcf68df763b2eb8cc484a8d7e
Signed-off-by: Carlos Llamas <cmllamas@google.com>