On Wed, Jun 25, 2003 at 01:11:01AM +0200, Daniel Phillips wrote:

  - Page size is represented on a per-address space basis with a shift count.
    In practice, the smallest is 9 (512 byte sector), could imagine 7 (each
    ext2 inode is separate page) or 8 (actual hardsect size on some drives).
    12 will be the most common size.  13 gives 8K blocksize for, e.g., alpha.
    21 and 22 give 2M and 4M page size, matching hardware capabilities of
    x86, and other sizes are possible on machines like MIPS, where page size
    is software controllable
  - Implemented only for file-backed memory (page cache)

Per struct address_space? This is an unnecessary limitation.


On Wed, Jun 25, 2003 at 01:11:01AM +0200, Daniel Phillips wrote:

  - Special case these ops in page cache access layer instead of having the
    messy code in the block IO library
  - Subpage struct pages are dynamically allocated.  But buffer_heads are gone
    so this is a lateral change.

This gives me the same data structure proliferation chills as bh's.


-- wli