Re: [PATCH 3/7] remove putback_lru_pages() in hugepage migrationcontext

[Naoya Horiguchi]

Hi,

On Fri, Jan 21, 2011 at 03:40:35PM +0900, Minchan Kim wrote:
> Hello,
> 
> On Fri, Jan 21, 2011 at 3:28 PM, Naoya Horiguchi
> <n-horiguchi@xxxxxxxxxxxxx> wrote:
> > This putback_lru_pages() is inserted at cf608ac19c to allow
> > memory compaction to count the number of migration failed pages.
> >
> > But we should not do it for a hugepage because page->lru of a hugepage
> > is used differently from that of a normal page:
> >
> >   in-use hugepage : page->lru is unlinked,
> >   free hugepage   : page->lru is linked to the free hugepage list,
> >
> > so putting back hugepages to LRU lists collapses this rule.
> > We just drop this change (without any impact on memory compaction.)
> >
> > Signed-off-by: Naoya Horiguchi <n-horiguchi@xxxxxxxxxxxxx>
> > Cc: Minchan Kim <minchan.kim@xxxxxxxxx>
> 
> As I said previously, It seems mistake during patch merge.
> I didn't add it in my original patch. You can see my final patch.
> https://lkml.org/lkml/2010/8/24/248

OK.

> Anyway, I realized it recently so I sent the patch to Andrew.
> Could you see this one?
> https://lkml.org/lkml/2011/1/20/241

This patch seems not to change hugepage soft offline's behavior,
so I have no objection.

-- Naoya Horiguchi
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