Re: smp race fix between invalidate_inode_pages* and do_no_page

Andrea Arcangeli wrote:

The main scary thing as far as I can tell, is the blocking lock_page. We
can't just do TryLockPage...

Hopefully that should be OK... it should not tend to get tripped up on read
because filemap_nopage needs to take the lock and wait in that case anyway.
Hopefully other lock_page users will be in the noise?

Another option might be a spinbit in page->flags but that seems like overkill.

--
SUSE Labs, Novell Inc.

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• References:
  • Re: smp race fix between invalidate_inode_pages* and do_no_page
    • From: Andrea Arcangeli <[email protected]>
  • Re: smp race fix between invalidate_inode_pages* and do_no_page
    • From: Nick Piggin <[email protected]>
  • Re: smp race fix between invalidate_inode_pages* and do_no_page
    • From: Andrea Arcangeli <[email protected]>
  • Re: smp race fix between invalidate_inode_pages* and do_no_page
    • From: Andrew Morton <[email protected]>
  • Re: smp race fix between invalidate_inode_pages* and do_no_page
    • From: Andrea Arcangeli <[email protected]>

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