On Tue, 17 Jun 2008 18:03:14 +0900, KAMEZAWA Hiroyuki <kamezawa.hiroyu@xxxxxxxxxxxxxx> wrote:
> On Tue, 17 Jun 2008 16:47:09 +0900
> Daisuke Nishimura <nishimura@xxxxxxxxxxxxxxxxx> wrote:
>
> > On Tue, 17 Jun 2008 16:35:01 +0900, Daisuke Nishimura <nishimura@xxxxxxxxxxxxxxxxx> wrote:
> > > Hi.
> > >
> > > I got this bug while migrating pages only a few times
> > > via memory_migrate of cpuset.
> > >
> > > Unfortunately, even if this patch is applied,
> > > I got bad_page problem after hundreds times of page migration
> > > (I'll report it in another mail).
> > > But I believe something like this patch is needed anyway.
> > >
> >
> > I got bad_page after hundreds times of page migration.
> > It seems that a locked page is being freed.
> >
> Good catch, and I think your investigation in the last e-mail was correct.
> I'd like to dig this...but it seems some kind of big fix is necessary.
> Did this happen under page-migraion by cpuset-task-move test ?
>
Yes.
I made 2 cpuset directories, run some processes in each cpusets,
and run a script like below infinitely to move tasks and migrate pages.
---
#!/bin/bash
G1=$1
G2=$2
move_task()
{
for pid in $1
do
echo $pid >$2/tasks 2>/dev/null
done
}
G1_TASK=`cat ${G1}/tasks`
G2_TASK=`cat ${G2}/tasks`
move_task "${G1_TASK}" ${G2} &
move_task "${G2_TASK}" ${G1} &
wait
---
I got this bad_page after running this script for about 600 times.
Thanks,
Daisuke Nishimura.
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