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From: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com>
To: Anshuman Khandual <anshuman.khandual@arm.com>
Cc: "linux-mm@kvack.org" <linux-mm@kvack.org>,
	"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
	Michal Hocko <mhocko@kernel.org>,
	"Andrew Morton" <akpm@linux-foundation.org>,
	Mike Kravetz <mike.kravetz@oracle.com>,
	"xishi.qiuxishi@alibaba-inc.com" <xishi.qiuxishi@alibaba-inc.com>,
	"Laurent Dufour" <ldufour@linux.vnet.ibm.com>
Subject: Re: [RFC][PATCH v1 11/11] mm: hwpoison: introduce clear_hwpoison_free_buddy_page()
Date: Tue, 13 Nov 2018 00:19:08 +0000	[thread overview]
Message-ID: <20181113001907.GD5945@hori1.linux.bs1.fc.nec.co.jp> (raw)
In-Reply-To: <d37c1be2-2069-a147-9ba8-4749cd386d0b@arm.com>

On Fri, Nov 09, 2018 at 05:03:06PM +0530, Anshuman Khandual wrote:
> 
> 
> On 11/09/2018 12:17 PM, Naoya Horiguchi wrote:
> > The new function is a reverse operation of set_hwpoison_free_buddy_page()
> > to adjust unpoison_memory() to the new semantics.
> > 
> > Signed-off-by: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com>
> 
> snip
> 
> > +
> > +/*
> > + * Reverse operation of set_hwpoison_free_buddy_page(), which is expected
> > + * to work only on error pages isolated from buddy allocator.
> > + */
> > +bool clear_hwpoison_free_buddy_page(struct page *page)
> > +{
> > +	struct zone *zone = page_zone(page);
> > +	bool unpoisoned = false;
> > +
> > +	spin_lock(&zone->lock);
> > +	if (TestClearPageHWPoison(page)) {
> > +		unsigned long pfn = page_to_pfn(page);
> > +		int migratetype = get_pfnblock_migratetype(page, pfn);
> > +
> > +		__free_one_page(page, pfn, zone, 0, migratetype);
> > +		unpoisoned = true;
> > +	}
> > +	spin_unlock(&zone->lock);
> > +	return unpoisoned;
> > +}
> >  #endif
> > 
> 
> Though there are multiple page state checks in unpoison_memory() leading
> upto clearing HWPoison flag, the page must not be in buddy already if
> __free_one_page() would be called on it.

Yes, you're right.
clear_hwpoison_free_buddy_page() is intended to cancel the isolation by
set_hwpoison_free_buddy_page() which removes the target page from buddy allocator,
so the page clear_hwpoison_free_buddy_page() tries to handle is not a buddy page
actually (not linked to any freelist).

Thanks,
Naoya Horiguchi

  reply	other threads:[~2018-11-13  0:21 UTC|newest]

Thread overview: 24+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-11-09  6:47 [PATCH RFC v1 00/11] hwpoison improvement part 1 Naoya Horiguchi
2018-11-09  6:47 ` [RFC][PATCH v1 01/11] mm: hwpoison: cleanup unused PageHuge() check Naoya Horiguchi
2018-11-09  9:52   ` Anshuman Khandual
2018-11-09  6:47 ` [RFC][PATCH v1 02/11] mm: soft-offline: add missing error check of set_hwpoison_free_buddy_page() Naoya Horiguchi
2018-11-09 10:20   ` Anshuman Khandual
2018-11-13  0:16     ` Naoya Horiguchi
2018-11-14  8:53       ` Anshuman Khandual
2018-11-09  6:47 ` [RFC][PATCH v1 03/11] mm: move definition of num_poisoned_pages_inc/dec to include/linux/mm.h Naoya Horiguchi
2018-11-09 10:28   ` Anshuman Khandual
2018-11-13  0:17     ` Naoya Horiguchi
2018-11-09  6:47 ` [RFC][PATCH v1 04/11] mm: madvise: call soft_offline_page() without MF_COUNT_INCREASED Naoya Horiguchi
2018-11-09 10:46   ` Anshuman Khandual
2018-11-13  0:18     ` Naoya Horiguchi
2018-11-09  6:47 ` [RFC][PATCH v1 05/11] mm: hwpoison-inject: don't pin for hwpoison_filter() Naoya Horiguchi
2018-11-09  6:47 ` [RFC][PATCH v1 06/11] mm: hwpoison: remove MF_COUNT_INCREASED Naoya Horiguchi
2018-11-09  6:47 ` [RFC][PATCH v1 07/11] mm: remove flag argument from soft offline functions Naoya Horiguchi
2018-11-09  6:47 ` [RFC][PATCH v1 08/11] mm: soft-offline: isolate error pages from buddy freelist Naoya Horiguchi
2018-11-09  6:47 ` [RFC][PATCH v1 09/11] mm: hwpoison: apply buddy page handling code to hard-offline Naoya Horiguchi
2018-11-09  6:47 ` [RFC][PATCH v1 10/11] mm: clear PageHWPoison in memory hotremove Naoya Horiguchi
2018-11-13  1:32   ` Naoya Horiguchi
2018-11-09  6:47 ` [RFC][PATCH v1 11/11] mm: hwpoison: introduce clear_hwpoison_free_buddy_page() Naoya Horiguchi
2018-11-09 11:33   ` Anshuman Khandual
2018-11-13  0:19     ` Naoya Horiguchi [this message]
2018-11-14  8:23       ` Anshuman Khandual

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