fs: drop_caches: draining pages before dropping caches

We expect a file page access after dropping caches should be a major
fault, but sometimes it's still a minor fault.  That's because a file page
can't be dropped if it's in a per-cpu pagevec.  Draining all pages from
per-cpu pagevec to lru list before trying to drop caches.

Link: https://lkml.kernel.org/r/[email protected]
Signed-off-by: Andrew Yang <[email protected]>
Cc: Al Viro <[email protected]>
Cc: AngeloGioacchino Del Regno <[email protected]>
Cc: Christian Brauner <[email protected]>
Cc: Matthias Brugger <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>

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