Re: [PATCH] laptop mode

[Marcelo Tosatti]

On Thu, 9 Oct 2003, Jeff Garzik wrote:

> 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 ;-(

Uh, oh... Jens? 

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