• Nick Piggin's avatar
    [PATCH] replace clear_page_tables with clear_page_range · 62dc69da
    Nick Piggin authored
    Rename clear_page_tables to clear_page_range. clear_page_range takes byte
    ranges, and aggressively frees page table pages. Maybe useful to control
    page table memory consumption on 4-level architectures (and even 3 level
    ones).
    
    Possible downsides are:
    - flush_tlb_pgtables gets called more often (only a problem for sparc64
      AFAIKS).
    
    - the opportunistic "expand to fill PGDIR_SIZE hole" logic that ensures
      something actually gets done under the old system is still in place.
      This could sometimes make unmapping small regions more inefficient. There
      are some other solutions to look at if this is the case though.
    Signed-off-by: default avatarNick Piggin <nickpiggin@yahoo.com.au>
    Signed-off-by: default avatarLinus Torvalds <torvalds@osdl.org>
    62dc69da
pgtable.c 6.33 KB