From: Andi Kleen <andi@firstfloor.org>
To: Cyril Hrubis <chrubis@suse.cz>
Cc: Andi Kleen <andi@firstfloor.org>,
Naoya Horiguchi <n-horiguchi@ah.jp.nec.com>,
"linux-mm@kvack.org" <linux-mm@kvack.org>,
"ltp@lists.linux.it" <ltp@lists.linux.it>
Subject: Re: [LTP] Is MADV_HWPOISON supposed to work only on faulted-in pages?
Date: Tue, 28 Mar 2017 13:26:52 -0700 [thread overview]
Message-ID: <20170328202652.GC8285@two.firstfloor.org> (raw)
In-Reply-To: <20170328082506.GA30388@rei>
> Well I disagree, the reason why the test fails is that MADV_HWPOISON on
> not-faulted private mappings fails silently, which is a bug, albeit
> minor one. If something is not implemented, it should report a failure,
> the usual error return would be EINVAL in this case.
>
> It appears that it fails with EBUSY on first try on newer kernels, but
> still fails silently when we try for a second time.
>
> Why can't we simply check if the page is faulted or not and return error
> in the latter case?
It's a debug interface. You're supposed to know what you're doing.
-Andi
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WARNING: multiple messages have this Message-ID (diff)
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: Tue, 28 Mar 2017 13:26:52 -0700 [thread overview]
Message-ID: <20170328202652.GC8285@two.firstfloor.org> (raw)
In-Reply-To: <20170328082506.GA30388@rei>
> Well I disagree, the reason why the test fails is that MADV_HWPOISON on
> not-faulted private mappings fails silently, which is a bug, albeit
> minor one. If something is not implemented, it should report a failure,
> the usual error return would be EINVAL in this case.
>
> It appears that it fails with EBUSY on first try on newer kernels, but
> still fails silently when we try for a second time.
>
> Why can't we simply check if the page is faulted or not and return error
> in the latter case?
It's a debug interface. You're supposed to know what you're doing.
-Andi
next prev parent reply other threads:[~2017-03-28 20:26 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
2017-03-27 23:54 ` [LTP] " Andi Kleen
2017-03-28 8:25 ` Cyril Hrubis
2017-03-28 8:25 ` Cyril Hrubis
2017-03-28 20:26 ` Andi Kleen [this message]
2017-03-28 20:26 ` Andi Kleen
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