• Andrew Morton's avatar
    [PATCH] madvise_willneed() maximum readahead checking · 654107b9
    Andrew Morton authored
    madvise_willneed() currently has a very strange check on how much readahead
    it is prepared to do.
    
      It is based on the user's rss limit.  But this is usually enormous, and
      the user isn't necessarily going to map all that memory at the same time
      anyway.
    
      And the logic is wrong - it is comparing rss (which is in bytes) with
      `end - start', which is in pages.
    
      And it returns -EIO on error, which is not mentioned in the Open Group
      spec and doesn't make sense.
    
    
    This patch takes it all out and applies the same upper limit as is used in
    sys_readahead() - half the inactive list.
    654107b9
filemap.c 43.8 KB