ChangeSet 1.1150.1.52, 2003/10/08 10:49:45-03:00, axboe@xxxxxxx
[PATCH] laptop mode
Hi Marcelo,
Lots of people have been using this patch with great success, and it's
been in the SuSE kernel for some months now too. It is also in the -benh
ppc tree
Basically, it introduces a write back mode of dirty and journal data
that is more suitable for laptops. At the block layer end, it schedules
write out of dirty data after the disk has been idle for 5 seconds.
Laptop mode can be switched on and off with /proc/sys/vm/laptop_mode.
There is also a block_dump sysctl, which if enabled will dump who
dirties and writes out data. This is very helpful in pinning down who is
causing unnecessary writes to the disk.