Messages in this thread | | | Date | Thu, 15 Apr 2010 16:58:58 +1000 | From | Dave Chinner <> | Subject | Re: [PATCH] mm: disallow direct reclaim page writeback |
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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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