From: "Kirill A. Shutemov" <kirill@shutemov.name>
To: Dave Hansen <dave.hansen@linux.intel.com>
Cc: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>,
torvalds@linux-foundation.org, kirill.shutemov@linux.intel.com,
akpm@linux-foundation.org, hannes@cmpxchg.org,
iamjoonsoo.kim@lge.com, mgorman@techsingularity.net,
tony.luck@intel.com, vbabka@suse.cz, mhocko@kernel.org,
aarcange@redhat.com, hillf.zj@alibaba-inc.com, hughd@google.com,
oleg@redhat.com, peterz@infradead.org, riel@redhat.com,
srikar@linux.vnet.ibm.com, vdavydov.dev@gmail.com,
mingo@kernel.org, linux-kernel@vger.kernel.org,
linux-mm@kvack.org, x86@kernel.org
Subject: Re: [mm 4.15-rc8] Random oopses under memory pressure.
Date: Thu, 18 Jan 2018 17:45:14 +0300 [thread overview]
Message-ID: <20180118144514.njr5xdagtwzpzep6@node.shutemov.name> (raw)
In-Reply-To: <4a6681a7-5ed6-ad9c-5d1d-73f1fcc82f3d@linux.intel.com>
On Thu, Jan 18, 2018 at 06:38:10AM -0800, Dave Hansen wrote:
> On 01/18/2018 05:12 AM, Kirill A. Shutemov wrote:
> > - if (pte_page(*pvmw->pte) - pvmw->page >=
> > - hpage_nr_pages(pvmw->page)) {
>
> Is ->pte guaranteed to map a page which is within the same section as
> pvmw->page? Otherwise, with sparsemem (non-vmemmap), the pointer
> arithmetic won't work.
No, it's not guaranteed. It can be arbitrary page.
The arithmetic won't work because they are different "memory objects"?
--
Kirill A. Shutemov
WARNING: multiple messages have this Message-ID (diff)
From: "Kirill A. Shutemov" <kirill@shutemov.name>
To: Dave Hansen <dave.hansen@linux.intel.com>
Cc: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>,
torvalds@linux-foundation.org, kirill.shutemov@linux.intel.com,
akpm@linux-foundation.org, hannes@cmpxchg.org,
iamjoonsoo.kim@lge.com, mgorman@techsingularity.net,
tony.luck@intel.com, vbabka@suse.cz, mhocko@kernel.org,
aarcange@redhat.com, hillf.zj@alibaba-inc.com, hughd@google.com,
oleg@redhat.com, peterz@infradead.org, riel@redhat.com,
srikar@linux.vnet.ibm.com, vdavydov.dev@gmail.com,
mingo@kernel.org, linux-kernel@vger.kernel.org,
linux-mm@kvack.org, x86@kernel.org
Subject: Re: [mm 4.15-rc8] Random oopses under memory pressure.
Date: Thu, 18 Jan 2018 17:45:14 +0300 [thread overview]
Message-ID: <20180118144514.njr5xdagtwzpzep6@node.shutemov.name> (raw)
In-Reply-To: <4a6681a7-5ed6-ad9c-5d1d-73f1fcc82f3d@linux.intel.com>
On Thu, Jan 18, 2018 at 06:38:10AM -0800, Dave Hansen wrote:
> On 01/18/2018 05:12 AM, Kirill A. Shutemov wrote:
> > - if (pte_page(*pvmw->pte) - pvmw->page >=
> > - hpage_nr_pages(pvmw->page)) {
>
> Is ->pte guaranteed to map a page which is within the same section as
> pvmw->page? Otherwise, with sparsemem (non-vmemmap), the pointer
> arithmetic won't work.
No, it's not guaranteed. It can be arbitrary page.
The arithmetic won't work because they are different "memory objects"?
--
Kirill A. Shutemov
--
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next prev parent reply other threads:[~2018-01-18 14:45 UTC|newest]
Thread overview: 108+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-01-05 14:45 [x86? mm? fs? 4.15-rc6] Random oopses by simple write under memory pressure Tetsuo Handa
2018-01-09 10:39 ` [mm? 4.15-rc7] " Tetsuo Handa
2018-01-10 11:49 ` [mm? 4.15-rc7] Random oopses " Tetsuo Handa
2018-01-10 12:45 ` Michal Hocko
2018-01-10 13:37 ` Tetsuo Handa
2018-01-11 13:57 ` Michal Hocko
2018-01-11 14:11 ` Tetsuo Handa
2018-01-11 14:21 ` Michal Hocko
2018-01-11 14:37 ` Tetsuo Handa
2018-01-12 1:31 ` [mm " Tetsuo Handa
2018-01-12 1:42 ` Linus Torvalds
2018-01-12 11:22 ` Tetsuo Handa
2018-01-14 11:54 ` Tetsuo Handa
2018-01-14 11:54 ` Tetsuo Handa
2018-01-15 23:05 ` Linus Torvalds
2018-01-15 23:05 ` Linus Torvalds
2018-01-16 1:15 ` [mm 4.15-rc8] " Tetsuo Handa
2018-01-16 1:15 ` Tetsuo Handa
2018-01-16 2:14 ` Linus Torvalds
2018-01-16 2:14 ` Linus Torvalds
2018-01-16 8:06 ` Dave Hansen
2018-01-16 8:06 ` Dave Hansen
2018-01-16 8:37 ` Ingo Molnar
2018-01-16 8:37 ` Ingo Molnar
2018-01-16 19:30 ` Linus Torvalds
2018-01-16 19:30 ` Linus Torvalds
2018-01-16 17:33 ` Tetsuo Handa
2018-01-16 17:33 ` Tetsuo Handa
2018-01-16 19:34 ` Linus Torvalds
2018-01-16 19:34 ` Linus Torvalds
2018-01-17 11:08 ` Tetsuo Handa
2018-01-17 11:08 ` Tetsuo Handa
2018-01-17 21:39 ` Linus Torvalds
2018-01-17 21:39 ` Linus Torvalds
2018-01-17 21:51 ` Linus Torvalds
2018-01-17 21:51 ` Linus Torvalds
2018-01-17 22:04 ` Dave Hansen
2018-01-17 22:04 ` Dave Hansen
2018-01-17 22:00 ` Dave Hansen
2018-01-17 22:00 ` Dave Hansen
2018-01-17 22:15 ` Linus Torvalds
2018-01-17 22:15 ` Linus Torvalds
2018-01-18 8:12 ` Tetsuo Handa
2018-01-18 8:12 ` Tetsuo Handa
2018-01-18 12:25 ` Kirill A. Shutemov
2018-01-18 12:25 ` Kirill A. Shutemov
2018-01-18 13:12 ` Kirill A. Shutemov
2018-01-18 13:12 ` Kirill A. Shutemov
2018-01-18 14:34 ` Kirill A. Shutemov
2018-01-18 14:34 ` Kirill A. Shutemov
2018-01-18 14:38 ` Dave Hansen
2018-01-18 14:38 ` Dave Hansen
2018-01-18 14:45 ` Kirill A. Shutemov [this message]
2018-01-18 14:45 ` Kirill A. Shutemov
2018-01-18 14:51 ` Dave Hansen
2018-01-18 14:51 ` Dave Hansen
2018-01-18 16:58 ` Linus Torvalds
2018-01-18 16:58 ` Linus Torvalds
2018-01-18 14:45 ` Dave Hansen
2018-01-18 14:45 ` Dave Hansen
2018-01-18 14:58 ` Andrea Arcangeli
2018-01-18 14:58 ` Andrea Arcangeli
2018-01-18 16:56 ` Kirill A. Shutemov
2018-01-18 16:56 ` Kirill A. Shutemov
2018-01-18 17:26 ` Luck, Tony
2018-01-18 17:26 ` Luck, Tony
2018-01-18 17:28 ` Linus Torvalds
2018-01-18 17:28 ` Linus Torvalds
2018-01-18 17:26 ` Linus Torvalds
2018-01-18 17:26 ` Linus Torvalds
2018-01-18 23:49 ` Kirill A. Shutemov
2018-01-18 23:49 ` Kirill A. Shutemov
2018-01-19 12:55 ` Matthew Wilcox
2018-01-19 12:55 ` Matthew Wilcox
2018-01-19 18:42 ` Linus Torvalds
2018-01-19 18:42 ` Linus Torvalds
2018-01-19 22:12 ` Al Viro
2018-01-19 22:12 ` Al Viro
2018-01-19 22:53 ` Linus Torvalds
2018-01-19 22:53 ` Linus Torvalds
2018-01-20 2:02 ` Al Viro
2018-01-20 2:02 ` Al Viro
2018-01-20 5:24 ` Al Viro
2018-01-20 5:24 ` Al Viro
2018-01-20 9:38 ` Luc Van Oostenryck
2018-01-20 9:38 ` Luc Van Oostenryck
2018-01-20 9:38 ` Luc Van Oostenryck
2018-01-20 14:45 ` Luc Van Oostenryck
2018-01-22 13:26 ` Rasmus Villemoes
2018-01-22 19:58 ` Linus Torvalds
2018-01-18 15:40 ` Kirill A. Shutemov
2018-01-18 15:40 ` Kirill A. Shutemov
2018-01-18 17:22 ` Michal Hocko
2018-01-18 17:22 ` Michal Hocko
2018-01-19 10:02 ` Kirill A. Shutemov
2018-01-19 10:02 ` Kirill A. Shutemov
2018-01-19 10:33 ` Michal Hocko
2018-01-19 10:33 ` Michal Hocko
2018-01-19 11:49 ` Kirill A. Shutemov
2018-01-19 11:49 ` Kirill A. Shutemov
2018-01-19 12:07 ` Michal Hocko
2018-01-19 12:07 ` Michal Hocko
2018-01-19 12:30 ` Kirill A. Shutemov
2018-01-19 12:30 ` Kirill A. Shutemov
2018-01-19 2:01 ` Tetsuo Handa
2018-01-19 2:01 ` Tetsuo Handa
2018-01-11 18:11 ` [mm? 4.15-rc7] " Linus Torvalds
2018-01-11 20:59 ` Tetsuo Handa
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