Re: [RFC] My research agenda for 2.7

William Lee Irwin III
2003-06-25T00:47:58Z

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