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From: Oscar Salvador <osalvador@suse.de>
To: Qian Cai <qcai@redhat.com>
Cc: akpm@linux-foundation.org, n-horiguchi@ah.jp.nec.com,
	linux-mm@kvack.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH 0/7] HWPoison: Refactor get page interface
Date: Wed, 2 Dec 2020 14:41:39 +0100	[thread overview]
Message-ID: <20201202134131.GA8110@linux> (raw)
In-Reply-To: <1ba3d19ab0629e549519fb94b73cabb0b392fb2a.camel@redhat.com>

On Wed, Dec 02, 2020 at 08:34:57AM -0500, Qian Cai wrote:
> On Thu, 2020-11-19 at 11:57 +0100, Oscar Salvador wrote:
> > Hi,
> > 
> > following up on previous fix-ups an refactors, this patchset simplifies
> > the get page interface and removes the MF_COUNT_INCREASED trick we have
> > for soft offline.
> 
> Well, the madvise() EIO is back. I don't understand why we can't test it on a
> NUMA system before posting this over and over again.
> 
> # git clone https://e.coding.net/cailca/linux/mm
> # cd mm; make
> # ./ranbug 1 
> - start: migrate_huge_offline
> - use NUMA nodes 0,3.
> - mmap and free 8388608 bytes hugepages on node 0
> - mmap and free 8388608 bytes hugepages on node 3
> madvise: Input/output error

I tried it out myself enlarging the window race artificially but I was not able
to get -EIO anymore.
But as Vlastimil pointed out in the respective patch, it is better to keep the
page pinned for madvise.

I am planning to re-post leaving out the patches that remove the pinning.

Anyway, thanks for the report.

-- 
Oscar Salvador
SUSE L3

      reply	other threads:[~2020-12-02 13:42 UTC|newest]

Thread overview: 26+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-11-19 10:57 Oscar Salvador
2020-11-19 10:57 ` [PATCH 1/7] mm,hwpoison: Refactor get_any_page Oscar Salvador
2020-11-20  1:33   ` HORIGUCHI NAOYA(堀口 直也)
2020-11-25 16:54   ` Vlastimil Babka
2020-11-19 10:57 ` [PATCH 2/7] mm,hwpoison: Drop pfn parameter Oscar Salvador
2020-11-20  1:33   ` HORIGUCHI NAOYA(堀口 直也)
2020-11-25 16:55   ` Vlastimil Babka
2020-11-19 10:57 ` [PATCH 3/7] mm,madvise: call soft_offline_page() without MF_COUNT_INCREASED Oscar Salvador
2020-11-25 18:20   ` Vlastimil Babka
2020-12-01 11:35     ` Oscar Salvador
2020-12-04 17:25       ` Vlastimil Babka
2020-12-05 15:34         ` Oscar Salvador
2020-12-07  2:34           ` HORIGUCHI NAOYA(堀口 直也)
2020-12-07  7:24             ` Oscar Salvador
2020-11-19 10:57 ` [PATCH 4/7] mm,hwpoison: remove MF_COUNT_INCREASED Oscar Salvador
2020-11-19 10:57 ` [PATCH 5/7] mm,hwpoison: remove flag argument from soft offline functions Oscar Salvador
2020-11-19 10:57 ` [PATCH 6/7] mm,hwpoison: Disable pcplists before grabbing a refcount Oscar Salvador
2020-11-20  1:33   ` HORIGUCHI NAOYA(堀口 直也)
2020-11-26 13:45   ` Vlastimil Babka
2020-11-28  0:51     ` Andrew Morton
2020-11-19 10:57 ` [PATCH 7/7] mm,hwpoison: Remove drain_all_pages from shake_page Oscar Salvador
2020-11-20  1:33   ` HORIGUCHI NAOYA(堀口 直也)
2020-11-26 13:52   ` Vlastimil Babka
2020-11-27  7:20     ` Oscar Salvador
2020-12-02 13:34 ` [PATCH 0/7] HWPoison: Refactor get page interface Qian Cai
2020-12-02 13:41   ` Oscar Salvador [this message]

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