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From: Andi Kleen <andi@firstfloor.org>
To: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com>
Cc: Jan Stancek <jstancek@redhat.com>,
	"linux-mm@kvack.org" <linux-mm@kvack.org>,
	"ltp@lists.linux.it" <ltp@lists.linux.it>
Subject: Re: Is MADV_HWPOISON supposed to work only on faulted-in pages?
Date: Mon, 27 Mar 2017 16:54:42 -0700	[thread overview]
Message-ID: <87zig6uvgd.fsf@firstfloor.org> (raw)
In-Reply-To: <20170223032342.GA18740@hori1.linux.bs1.fc.nec.co.jp> (Naoya Horiguchi's message of "Thu, 23 Feb 2017 03:23:49 +0000")

Naoya Horiguchi <n-horiguchi@ah.jp.nec.com> writes:
>
> I think that what the testcase effectively does is to test whether memory
> handling on zero pages works or not.
> And the testcase's failure seems acceptable, because it's simply not-implemented yet.
> Maybe recovering from error on zero page is possible (because there's no data
> loss for memory error,) but I'm not sure that code might be simple enough and/or
> it's worth doing ...

I doubt it's worth doing, it's just too unlikely that a specific page
is hit. Memory error handling is all about probabilities.

The test is just broken and should be fixed.

mce-test had similar problems at some point, but they were all fixed.

-Andi

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WARNING: multiple messages have this Message-ID
From: Andi Kleen <andi@firstfloor.org>
To: ltp@lists.linux.it
Subject: [LTP] Is MADV_HWPOISON supposed to work only on faulted-in pages?
Date: Mon, 27 Mar 2017 16:54:42 -0700	[thread overview]
Message-ID: <87zig6uvgd.fsf@firstfloor.org> (raw)
In-Reply-To: <20170223032342.GA18740@hori1.linux.bs1.fc.nec.co.jp> (Naoya Horiguchi's message of "Thu, 23 Feb 2017 03:23:49 +0000")

Naoya Horiguchi <n-horiguchi@ah.jp.nec.com> writes:
>
> I think that what the testcase effectively does is to test whether memory
> handling on zero pages works or not.
> And the testcase's failure seems acceptable, because it's simply not-implemented yet.
> Maybe recovering from error on zero page is possible (because there's no data
> loss for memory error,) but I'm not sure that code might be simple enough and/or
> it's worth doing ...

I doubt it's worth doing, it's just too unlikely that a specific page
is hit. Memory error handling is all about probabilities.

The test is just broken and should be fixed.

mce-test had similar problems at some point, but they were all fixed.

-Andi

  parent reply	other threads:[~2017-03-27 23:54 UTC|newest]

Thread overview: 26+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2017-02-14 15:41 Is MADV_HWPOISON supposed to work only on faulted-in pages? Jan Stancek
2017-02-14 15:41 ` [LTP] " Jan Stancek
2017-02-20  5:00 ` Naoya Horiguchi
2017-02-20  5:00   ` [LTP] " Naoya Horiguchi
2017-02-23  3:23   ` Naoya Horiguchi
2017-02-23  3:23     ` [LTP] " Naoya Horiguchi
2017-02-25  2:28     ` Yisheng Xie
2017-02-25  2:28       ` [LTP] " Yisheng Xie
2017-02-27  1:20       ` Naoya Horiguchi
2017-02-27  1:20         ` [LTP] " Naoya Horiguchi
2017-02-27  4:27         ` Zi Yan
2017-02-27  4:27           ` [LTP] " Zi Yan
2017-02-27  6:33           ` Naoya Horiguchi
2017-02-27  6:33             ` [LTP] " Naoya Horiguchi
2017-02-27 16:10             ` Zi Yan
2017-02-27 16:10               ` [LTP] " Zi Yan
2017-03-14 13:20             ` Cyril Hrubis
2017-03-14 13:20               ` Cyril Hrubis
2017-03-27 12:08             ` Richard Palethorpe
2017-03-27 12:08               ` Richard Palethorpe
2017-03-27 23:54     ` Andi Kleen [this message]
2017-03-27 23:54       ` Andi Kleen
2017-03-28  8:25       ` Cyril Hrubis
2017-03-28  8:25         ` Cyril Hrubis
2017-03-28 20:26         ` Andi Kleen
2017-03-28 20:26           ` Andi Kleen

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