All of lore.kernel.org
 help / color / mirror / Atom feed
From: Jan Stancek <jstancek@redhat.com>
To: linux-mm@kvack.org
Cc: ltp@lists.linux.it
Subject: Is MADV_HWPOISON supposed to work only on faulted-in pages?
Date: Tue, 14 Feb 2017 16:41:29 +0100	[thread overview]
Message-ID: <6a445beb-119c-9a9a-0277-07866afe4924@redhat.com> (raw)

Hi,

code below (and LTP madvise07 [1]) doesn't produce SIGBUS,
unless I touch/prefault page before call to madvise().

Is this expected behavior?

Thanks,
Jan

[1] https://github.com/linux-test-project/ltp/blob/master/testcases/kernel/syscalls/madvise/madvise07.c

-------------------- 8< --------------------
#include <stdlib.h>
#include <sys/mman.h>
#include <unistd.h>

int main(void)
{
	void *mem = mmap(NULL, getpagesize(), PROT_READ | PROT_WRITE,
			MAP_ANONYMOUS | MAP_PRIVATE /*| MAP_POPULATE*/,
			-1, 0);

	if (mem == MAP_FAILED)
		exit(1);

	if (madvise(mem, getpagesize(), MADV_HWPOISON) == -1)
		exit(1);

	*((char *)mem) = 'd';

	return 0;
}
-------------------- 8< --------------------

--
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 (diff)
From: Jan Stancek <jstancek@redhat.com>
To: ltp@lists.linux.it
Subject: [LTP] Is MADV_HWPOISON supposed to work only on faulted-in pages?
Date: Tue, 14 Feb 2017 16:41:29 +0100	[thread overview]
Message-ID: <6a445beb-119c-9a9a-0277-07866afe4924@redhat.com> (raw)

Hi,

code below (and LTP madvise07 [1]) doesn't produce SIGBUS,
unless I touch/prefault page before call to madvise().

Is this expected behavior?

Thanks,
Jan

[1] https://github.com/linux-test-project/ltp/blob/master/testcases/kernel/syscalls/madvise/madvise07.c

-------------------- 8< --------------------
#include <stdlib.h>
#include <sys/mman.h>
#include <unistd.h>

int main(void)
{
	void *mem = mmap(NULL, getpagesize(), PROT_READ | PROT_WRITE,
			MAP_ANONYMOUS | MAP_PRIVATE /*| MAP_POPULATE*/,
			-1, 0);

	if (mem == MAP_FAILED)
		exit(1);

	if (madvise(mem, getpagesize(), MADV_HWPOISON) == -1)
		exit(1);

	*((char *)mem) = 'd';

	return 0;
}
-------------------- 8< --------------------

             reply	other threads:[~2017-02-14 15:41 UTC|newest]

Thread overview: 26+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2017-02-14 15:41 Jan Stancek [this message]
2017-02-14 15:41 ` [LTP] Is MADV_HWPOISON supposed to work only on faulted-in pages? 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
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=6a445beb-119c-9a9a-0277-07866afe4924@redhat.com \
    --to=jstancek@redhat.com \
    --cc=linux-mm@kvack.org \
    --cc=ltp@lists.linux.it \
    /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.