Re: [PATCH] laptop mode

[Jeff Garzik]

Linux Kernel Mailing List wrote:
> 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.

Red Hat just dropped this patch since it was suspected of data 
corruption ;-(

	Jeff



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