All of lore.kernel.org
 help / color / mirror / Atom feed
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

--
To unsubscribe, send a message with 'unsubscribe linux-mm' in
the body to majordomo@kvack.org.  For more info on Linux MM,
see: http://www.linux-mm.org/ .
Don't email: <a href=mailto:"dont@kvack.org"> email@kvack.org </a>

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: 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

  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

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=20170328202652.GC8285@two.firstfloor.org \
    --to=andi@firstfloor.org \
    --cc=chrubis@suse.cz \
    --cc=linux-mm@kvack.org \
    --cc=ltp@lists.linux.it \
    --cc=n-horiguchi@ah.jp.nec.com \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line before the message body.
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.