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    SubjectRe: [PATCH] laptop mode
    On Thu, Oct 09 2003, Marcelo Tosatti wrote:
    >
    >
    > 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@suse.de
    > > >
    > > > [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?

    See my previous mail. I don't see any problems with it, and I've
    certainly not heard of (or experienced myself) problems with the patch.
    I'm waiting for Jeff to expand on his mail, surely he/RH must know more
    about this issue.

    --
    Jens Axboe

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