gfs2: Fix should_fault_in_pages() logic

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Fix the fault-in window size logic:
* Use a maximum window size of 1 MiB instead of BIO_MAX_VECS * PAGE_SIZE.
  The previous window size was always one page because the pages variable
  was accidentally being defined and then redefined in
  should_fault_in_pages().
* The nr_dirtied heuristic for guessing when there might be memory
  pressure often results in very small window sizes.  Don't let
  nr_dirtied drop below 8 pages (as btrfs does).
* Compute the window size in units of bytes, not pages.
* Account for page overlap (unaligned iterators).

Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>

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Andreas Gruenbacher 2022-03-07 23:30:03 +01:00

parent b296393234

commit bb7f5d96aa

1 changed files with 9 additions and 8 deletions

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fs/gfs2/file.c

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