Christoph Lameter a écrit :
On Sat, 19 May 2007, William Lee Irwin III wrote:
However, there are numerous optimizations and features made possible
with flag bits, which might as could be made cheap by padding struct
page up to the next highest power of 2 bytes with space for flag bits.
Well the last time I tried to get this by Andi we became a bit concerned
when we realized that the memory map would grow by 14% in size. Given
that 4k page size challenged platforms have a huge amount of page structs
that growth is significant. I think it would be fine to do it for IA64
with 16k page size but not for x86_64.
This reminds me Andi attempted in the past to convert 'flags' to a 32 bits field :
http://marc.info/?l=linux-kernel&m=107903527523739&w=2
I wonder why this idea was not taken, saving 2MB per GB of memory is nice :)
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