linux-kernel - Re: [PATCH 0/4] A few cleanup and fixup patches for migration

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Date:   Tue, 12 Apr 2022 15:00:22 +0800
From:   "ying.huang@...el.com" <ying.huang@...el.com>
To:     Miaohe Lin <linmiaohe@...wei.com>
Cc:     mike.kravetz@...cle.com, shy828301@...il.com, willy@...radead.org,
        ziy@...dia.com, minchan@...nel.org, apopple@...dia.com,
        dave.hansen@...ux.intel.com, o451686892@...il.com,
        jhubbard@...dia.com, peterx@...hat.com, naoya.horiguchi@....com,
        mhocko@...e.com, riel@...hat.com, osalvador@...e.de,
        david@...hat.com, sfr@...b.auug.org.au, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org,
        Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH 0/4] A few cleanup and fixup patches for migration

On Tue, 2022-04-12 at 11:29 +0800, Miaohe Lin wrote:
> On 2022/4/12 10:25, ying.huang@...el.com wrote:
> > On Sat, 2022-04-09 at 15:38 +0800, Miaohe Lin wrote:
> > > Hi everyone,
> > > This series contains a few patches to remove unneeded lock page and
> > > PageMovable check, reduce the rcu lock duration. Also we fix potential
> > > pte_unmap on an not mapped pte. More details can be found in the
> > > respective changelogs. Thanks!
> > 
> > It appears that you ignored my comments for the previous version.  Can
> > you check it?
> 
> I do remember [1] and I tried to make isolate_huge_page consistent with isolate_lru_page.
> But their return value conventions are different. isolate_huge_page return 0 when
> success while isolate_huge_page returns true in this case. So make them consistent
> would lead to many code change. I should have added this in my changelog.

I found that there are only 7 callers of isolate_huge_page().  It sounds
like something that is still doable.

Best Regards,
Huang, Ying

> Thanks.
> 
> [1] https://lore.kernel.org/linux-mm/8735jsgctq.fsf@yhuang6-desk2.ccr.corp.intel.com/
> 
> 
> > 
> > Best Regards,
> > Huang, Ying
> > 
> > > ---
> > > v1:
> > >   rebase [1] on mainline.
> > > 
> > > [1] https://lore.kernel.org/lkml/20220304093409.25829-2-linmiaohe@huawei.com/T/
> > > ---
> > > Miaohe Lin (4):
> > >   mm/migration: reduce the rcu lock duration
> > >   mm/migration: remove unneeded lock page and PageMovable check
> > >   mm/migration: return errno when isolate_huge_page failed
> > >   mm/migration: fix potential pte_unmap on an not mapped pte
> > > 
> > >  include/linux/migrate.h |  2 +-
> > >  include/linux/swapops.h |  4 ++--
> > >  mm/filemap.c            | 10 +++++-----
> > >  mm/hugetlb.c            |  2 +-
> > >  mm/migrate.c            | 31 +++++++++++++------------------
> > >  5 files changed, 22 insertions(+), 27 deletions(-)
> > > 
> > 
> > 
> > 
> > .
> > 
>