Re: [RFC][BUGFIX][PATCH 2/2] memcg: fix file mapped underflow atmigration (v3)

[Daisuke Nishimura]

> > I have one concern for now. Reading the patch, the flag have influence on
> > only anonymous pages, so we'd better to note it and I feel it strange to
> > set(and clear) the flag of "old page" always(iow, even when !PageAnon)
> > in prepare_migration.
> > 
> 
> Hmm...Checking "Only Anon" is simpler ?
I just thought it was inconsistent that we always set/clear the bit about "old page",
while we set the bit about "new page" only in PageAnon case.

> It will have no meanings for migrating
> file caches, but it may have some meanings for easy debugging. 
> I think "mark it always but it's used only for anonymous page" is reasonable
> (if it causes no bug.)
> 
Anyway, I don't have any strong objection.
It's all right for me as long as it is well documented or commented.


Thanks,
Daisuke Nishimura.
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