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    SubjectRe: [PATCH] mm: disallow direct reclaim page writeback
    On Thu, Apr 15, 2010 at 03:44:50PM +0900, KOSAKI Motohiro wrote:
    > > > Now, kernel compile and/or backup operation seems keep nr_vmscan_write==0.
    > > > Dave, can you please try to run your pageout annoying workload?
    > >
    > > It's just as easy for you to run and observe the effects. Start with a VM
    > > with 1GB RAM and a 10GB scratch block device:
    > >
    > > # mkfs.xfs -f /dev/<blah>
    > > # mount -o logbsize=262144,nobarrier /dev/<blah> /mnt/scratch
    > >
    > > in one shell:
    > >
    > > # while [ 1 ]; do dd if=/dev/zero of=/mnt/scratch/foo bs=1024k ; done
    > >
    > > in another shell, if you have fs_mark installed, run:
    > >
    > > # ./fs_mark -S0 -n 100000 -F -s 0 -d /mnt/scratch/0 -d /mnt/scratch/1 -d /mnt/scratch/3 -d /mnt/scratch/2 &
    > >
    > > otherwise run a couple of these in parallel on different directories:
    > >
    > > # for i in `seq 1 1 100000`; do echo > /mnt/scratch/0/foo.$i ; done
    >
    > Thanks.
    >
    > Unfortunately, I don't have unused disks. So, I'll try it at (probably)
    > next week.

    A filesystem on a loopback device will work just as well ;)

    Cheers,

    Dave.
    --
    Dave Chinner
    david@fromorbit.com


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