From: Konstantin Khlebnikov <khlebnikov@openvz.org>
To: KOSAKI Motohiro <kosaki.motohiro@gmail.com>
Cc: "linux-mm@kvack.org" <linux-mm@kvack.org>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
Andrew Morton <akpm@linux-foundation.org>,
Andi Kleen <andi@firstfloor.org>
Subject: Re: [PATCH RFC 3/3] proc/smaps: show amount of hwpoison pages
Date: Tue, 01 May 2012 22:05:55 +0400 [thread overview]
Message-ID: <4FA02603.80807@openvz.org> (raw)
In-Reply-To: <CAHGf_=rWDMMv2dKz3paV2MnjsCNWBa2BaUTi+RnDo8DZ4zEr=g@mail.gmail.com>
KOSAKI Motohiro wrote:
> On Mon, Apr 30, 2012 at 7:29 AM, Konstantin Khlebnikov
> <khlebnikov@openvz.org> wrote:
>> This patch adds line "HWPoinson:<size> kB" into /proc/pid/smaps if
>> CONFIG_MEMORY_FAILURE=y and some HWPoison pages were found.
>> This may be useful for searching applications which use a broken memory.
>
> I dislike "maybe useful" claim. If we don't know exact motivation of a feature,
> we can't maintain them especially when a bugfix can't avoid ABI change.
>
> Please write down exact use case.
I don't know how to exactly use this hw-poison stuff, but smaps suppose to
export state of ptes in vma. It seems to rational to show also hw-poisoned ptes,
since kernel has this feature and pte can be in hw-poisoned state.
and now everyone can easily find them:
# sudo grep HWPoison /proc/*/smaps
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WARNING: multiple messages have this Message-ID (diff)
From: Konstantin Khlebnikov <khlebnikov@openvz.org>
To: KOSAKI Motohiro <kosaki.motohiro@gmail.com>
Cc: "linux-mm@kvack.org" <linux-mm@kvack.org>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
Andrew Morton <akpm@linux-foundation.org>,
Andi Kleen <andi@firstfloor.org>
Subject: Re: [PATCH RFC 3/3] proc/smaps: show amount of hwpoison pages
Date: Tue, 01 May 2012 22:05:55 +0400 [thread overview]
Message-ID: <4FA02603.80807@openvz.org> (raw)
In-Reply-To: <CAHGf_=rWDMMv2dKz3paV2MnjsCNWBa2BaUTi+RnDo8DZ4zEr=g@mail.gmail.com>
KOSAKI Motohiro wrote:
> On Mon, Apr 30, 2012 at 7:29 AM, Konstantin Khlebnikov
> <khlebnikov@openvz.org> wrote:
>> This patch adds line "HWPoinson:<size> kB" into /proc/pid/smaps if
>> CONFIG_MEMORY_FAILURE=y and some HWPoison pages were found.
>> This may be useful for searching applications which use a broken memory.
>
> I dislike "maybe useful" claim. If we don't know exact motivation of a feature,
> we can't maintain them especially when a bugfix can't avoid ABI change.
>
> Please write down exact use case.
I don't know how to exactly use this hw-poison stuff, but smaps suppose to
export state of ptes in vma. It seems to rational to show also hw-poisoned ptes,
since kernel has this feature and pte can be in hw-poisoned state.
and now everyone can easily find them:
# sudo grep HWPoison /proc/*/smaps
next prev parent reply other threads:[~2012-05-01 18:06 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-04-30 11:29 [PATCH RFC 1/3] proc/smaps: carefully handle migration entries Konstantin Khlebnikov
2012-04-30 11:29 ` Konstantin Khlebnikov
2012-04-30 11:29 ` [PATCH RFC 2/3] proc/smaps: show amount of nonlinear ptes in vma Konstantin Khlebnikov
2012-04-30 11:29 ` Konstantin Khlebnikov
2012-05-01 17:39 ` KOSAKI Motohiro
2012-05-01 17:39 ` KOSAKI Motohiro
2012-05-01 17:56 ` Konstantin Khlebnikov
2012-05-01 17:56 ` Konstantin Khlebnikov
2012-05-01 18:08 ` KOSAKI Motohiro
2012-05-01 18:08 ` KOSAKI Motohiro
2012-04-30 11:29 ` [PATCH RFC 3/3] proc/smaps: show amount of hwpoison pages Konstantin Khlebnikov
2012-04-30 11:29 ` Konstantin Khlebnikov
2012-05-01 17:35 ` KOSAKI Motohiro
2012-05-01 17:35 ` KOSAKI Motohiro
2012-05-01 18:05 ` Konstantin Khlebnikov [this message]
2012-05-01 18:05 ` Konstantin Khlebnikov
2012-05-01 18:14 ` KOSAKI Motohiro
2012-05-01 18:14 ` KOSAKI Motohiro
2012-05-31 20:12 ` Andrew Morton
2012-05-31 20:12 ` Andrew Morton
2012-05-01 18:29 ` Andi Kleen
2012-05-01 18:29 ` Andi Kleen
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