From: Aili Yao <yaoaili@kingsoft.com>
To: Matthew Wilcox <willy@infradead.org>
Cc: David Hildenbrand <david@redhat.com>, <akpm@linux-foundation.org>,
<naoya.horiguchi@nec.com>, <linux-mm@kvack.org>,
<linux-kernel@vger.kernel.org>, <yangfeng1@kingsoft.com>,
<sunhao2@kingsoft.com>, Oscar Salvador <osalvador@suse.de>,
Mike Kravetz <mike.kravetz@oracle.com>, <yaoaili@kingsoft.com>
Subject: Re: [PATCH] mm/gup: check page posion status for coredump.
Date: Thu, 18 Mar 2021 13:34:12 +0800 [thread overview]
Message-ID: <20210318133412.12078eb7@alex-virtual-machine> (raw)
In-Reply-To: <20210318044600.GJ3420@casper.infradead.org>
On Thu, 18 Mar 2021 04:46:00 +0000
Matthew Wilcox <willy@infradead.org> wrote:
> On Wed, Mar 17, 2021 at 10:12:02AM +0100, David Hildenbrand wrote:
> > > + if (IS_ENABLED(CONFIG_MEMORY_FAILURE) && ret == 1) {
> > > + if (unlikely(PageHuge(page) && PageHWPoison(compound_head(page))))
> > > + ret = 0;
> > > + else if (unlikely(PageHWPoison(page)))
> > > + ret = 0;
> > > + }
> >
> > I wonder if a simple
> >
> > if (PageHWPoison(compound_head(page)))
> > ret = 0;
> >
> > won't suffice. But I guess the "issue" is compound pages that are not huge
> > pages or transparent huge pages.
>
> THPs don't set the HWPoison bit on the head page.
>
> https://lore.kernel.org/linux-mm/20210316140947.GA3420@casper.infradead.org/
>
> (and PAGEFLAG(HWPoison, hwpoison, PF_ANY))
>
> By the way,
>
> #ifdef CONFIG_MEMORY_FAILURE
> PAGEFLAG(HWPoison, hwpoison, PF_ANY)
> TESTSCFLAG(HWPoison, hwpoison, PF_ANY)
> #define __PG_HWPOISON (1UL << PG_hwpoison)
> extern bool take_page_off_buddy(struct page *page);
> #else
> PAGEFLAG_FALSE(HWPoison)
> #define __PG_HWPOISON 0
> #endif
>
> so there's no need for this
> if (IS_ENABLED(CONFIG_MEMORY_FAILURE)
> check, as it simply turns into
>
> if (PageHuge(page) && 0)
> else if (0)
>
> and the compiler can optimise it all away.
Yes, You are right, I will modify this later.
Thanks for correction
--
Thanks!
Aili Yao
next prev parent reply other threads:[~2021-03-18 5:35 UTC|newest]
Thread overview: 27+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-03-17 8:37 [PATCH] mm/gup: check page posion status for coredump Aili Yao
2021-03-17 9:12 ` David Hildenbrand
2021-03-18 3:15 ` Aili Yao
2021-03-18 3:18 ` [PATCH v2] " Aili Yao
2021-03-18 4:46 ` [PATCH] " Matthew Wilcox
2021-03-18 5:34 ` Aili Yao [this message]
2021-03-19 2:44 ` [PATCH v3] " Aili Yao
2021-03-20 0:35 ` Matthew Wilcox
2021-03-22 3:40 ` Aili Yao
2021-03-22 11:33 ` [PATCH v5] mm/gup: check page hwposion " Aili Yao
2021-03-26 14:09 ` David Hildenbrand
2021-03-26 14:22 ` David Hildenbrand
2021-03-31 1:52 ` HORIGUCHI NAOYA(堀口 直也)
2021-03-31 2:43 ` Aili Yao
2021-03-31 4:32 ` HORIGUCHI NAOYA(堀口 直也)
2021-03-31 6:44 ` David Hildenbrand
2021-03-31 7:07 ` Aili Yao
2021-04-01 2:31 ` Aili Yao
2021-04-06 2:23 ` [PATCH v6] mm/gup: check page hwpoison status for memory recovery failures Aili Yao
2021-04-06 2:41 ` [PATCH v7] " Aili Yao
2021-04-07 1:54 ` HORIGUCHI NAOYA(堀口 直也)
2021-04-07 7:48 ` Aili Yao
2021-05-10 3:13 ` Aili Yao
2021-03-31 6:07 ` [PATCH v5] mm/gup: check page hwposion status for coredump Matthew Wilcox
2021-03-31 6:53 ` HORIGUCHI NAOYA(堀口 直也)
2021-03-31 7:05 ` David Hildenbrand
2021-03-18 8:14 ` [PATCH] mm/gup: check page posion " David Hildenbrand
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