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SubjectRe: [PATCH][RFC] fix kernel BUG at mm/migrate.c:719! in 2.6.26-rc5-mm3
On Wed, 18 Jun 2008 13:41:28 +0900
Daisuke Nishimura <nishimura@mxp.nes.nec.co.jp> wrote:

> On Wed, 18 Jun 2008 10:54:00 +0900, Daisuke Nishimura <nishimura@mxp.nes.nec.co.jp> wrote:
> > On Wed, 18 Jun 2008 00:33:18 +0900, KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com> wrote:
> > > > @@ -715,13 +725,7 @@ unlock:
> > > > * restored.
> > > > */
> > > > list_del(&page->lru);
> > > > - if (!page->mapping) {
> > > > - VM_BUG_ON(page_count(page) != 1);
> > > > - unlock_page(page);
> > > > - put_page(page); /* just free the old page */
> > > > - goto end_migration;
> > > > - } else
> > > > - unlock = putback_lru_page(page);
> > > > + unlock = putback_lru_page(page);
> > > > }
> > > >
> > > > if (unlock)
> > >
> > > this part is really necessary?
> > > I tryed to remove it, but any problem doesn't happend.
> > >
> > I made this part first, and added a fix for migration_entry_wait later.
> >
> > So, I haven't test without this part, and I think it will cause
> > VM_BUG_ON() here without this part.
> >
> > Anyway, I will test it.
> >
> I got this VM_BUG_ON() as expected only by doing:
>
> # echo $$ >/cgroup/cpuset/02/tasks
>
> So, I beleive that both fixes for migration_entry_wait and
> unmap_and_move (and, of course, removal VM_BUG_ON from
> putback_lru_page) are needed.
>
>
yes, but I'm now trying to rewrite putback_lru_page(). For avoid more complication.

Thanks,
-Kame



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