From: Andrew Morton <akpm@linux-foundation.org>
To: "Kirill A. Shutemov" <kirill@shutemov.name>
Cc: "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>,
Andrea Arcangeli <aarcange@redhat.com>,
Hugh Dickins <hughd@google.com>, Rik van Riel <riel@redhat.com>,
linux-mm@kvack.org, linux-kernel@vger.kernel.org,
Oleg Nesterov <oleg@redhat.com>,
Peter Zijlstra <peterz@infradead.org>
Subject: Re: [PATCH 01/12] uprobes: split THPs before trying replace them
Date: Tue, 24 Jan 2017 14:35:59 -0800 [thread overview]
Message-ID: <20170124143559.57cea7092a2efff940aeeef0@linux-foundation.org> (raw)
In-Reply-To: <20170124222217.GB19920@node.shutemov.name>
On Wed, 25 Jan 2017 01:22:17 +0300 "Kirill A. Shutemov" <kirill@shutemov.name> wrote:
> On Tue, Jan 24, 2017 at 01:28:49PM -0800, Andrew Morton wrote:
> > On Tue, 24 Jan 2017 19:28:13 +0300 "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com> wrote:
> >
> > > For THPs page_check_address() always fails. It's better to split them
> > > first before trying to replace.
> >
> > So what does this mean. uprobes simply fails to work when trying to
> > place a probe into a THP memory region?
>
> Looks like we can end up with endless retry loop in uprobe_write_opcode().
>
> > How come nobody noticed (and reported) this when using the feature?
>
> I guess it's not often used for anon memory.
OK, can we please include discussion of these things in the changelog?
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next prev parent reply other threads:[~2017-01-24 22:36 UTC|newest]
Thread overview: 36+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-01-24 16:28 [PATCH 00/12] Fix few rmap-related THP bugs Kirill A. Shutemov
2017-01-24 16:28 ` [PATCH 01/12] uprobes: split THPs before trying replace them Kirill A. Shutemov
2017-01-24 18:08 ` Rik van Riel
2017-01-24 21:28 ` Andrew Morton
2017-01-24 22:22 ` Kirill A. Shutemov
2017-01-24 22:35 ` Andrew Morton [this message]
2017-01-24 22:56 ` Kirill A. Shutemov
2017-01-25 16:55 ` Srikar Dronamraju
2017-01-25 17:44 ` Rik van Riel
2017-01-25 17:44 ` Kirill A. Shutemov
2017-01-25 18:35 ` Johannes Weiner
2017-01-25 18:38 ` Kirill A. Shutemov
2017-01-26 2:54 ` Srikar Dronamraju
2017-01-25 18:22 ` Johannes Weiner
2017-01-24 16:28 ` [PATCH 02/12] mm: introduce page_check_walk() Kirill A. Shutemov
2017-01-24 21:41 ` Andrew Morton
2017-01-24 22:50 ` Kirill A. Shutemov
2017-01-24 22:55 ` Andrew Morton
2017-01-25 17:53 ` Kirill A. Shutemov
2017-01-25 1:19 ` kbuild test robot
2017-01-25 1:59 ` kbuild test robot
2017-01-24 16:28 ` [PATCH 03/12] mm: fix handling PTE-mapped THPs in page_referenced() Kirill A. Shutemov
2017-01-24 16:28 ` [PATCH 04/12] mm: fix handling PTE-mapped THPs in page_idle_clear_pte_refs() Kirill A. Shutemov
2017-01-24 16:28 ` [PATCH 05/12] mm, rmap: check all VMAs that PTE-mapped THP can be part of Kirill A. Shutemov
2017-01-24 16:28 ` [PATCH 06/12] mm: convert page_mkclean_one() to page_check_walk() Kirill A. Shutemov
2017-01-25 1:44 ` kbuild test robot
2017-01-25 2:00 ` kbuild test robot
2017-01-24 16:28 ` [PATCH 07/12] mm: convert try_to_unmap_one() " Kirill A. Shutemov
2017-01-25 3:13 ` kbuild test robot
2017-01-24 16:28 ` [PATCH 08/12] mm, ksm: convert write_protect_page() " Kirill A. Shutemov
2017-01-24 16:28 ` [PATCH 09/12] mm, uprobes: convert __replace_page() " Kirill A. Shutemov
2017-01-26 2:58 ` Srikar Dronamraju
2017-01-24 16:28 ` [PATCH 10/12] mm: convert page_mapped_in_vma() " Kirill A. Shutemov
2017-01-24 16:28 ` [PATCH 11/12] mm: drop page_check_address{,_transhuge} Kirill A. Shutemov
2017-01-24 16:28 ` [PATCH 12/12] mm: convert remove_migration_pte() to page_check_walk() Kirill A. Shutemov
2017-01-25 1:54 ` kbuild test robot
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