From: Ingo Molnar <mingo@kernel.org>
To: Dan Williams <dan.j.williams@intel.com>
Cc: linux-kernel@vger.kernel.org, linux-mm@kvack.org,
"Jérôme Glisse" <jglisse@redhat.com>,
"Ingo Molnar" <mingo@redhat.com>,
"Andrew Morton" <akpm@linux-foundation.org>,
"Logan Gunthorpe" <logang@deltatee.com>,
"Kirill Shutemov" <kirill.shutemov@linux.intel.com>
Subject: Re: [PATCH v2] mm, zone_device: replace {get, put}_zone_device_page() with a single reference
Date: Sat, 29 Apr 2017 16:18:38 +0200 [thread overview]
Message-ID: <20170429141838.tkyfxhldmwypyipz@gmail.com> (raw)
In-Reply-To: <149339998297.24933.1129582806028305912.stgit@dwillia2-desk3.amr.corp.intel.com>
* Dan Williams <dan.j.williams@intel.com> wrote:
> Kirill points out that the calls to {get,put}_dev_pagemap() can be
> removed from the mm fast path if we take a single get_dev_pagemap()
> reference to signify that the page is alive and use the final put of the
> page to drop that reference.
>
> This does require some care to make sure that any waits for the
> percpu_ref to drop to zero occur *after* devm_memremap_page_release(),
> since it now maintains its own elevated reference.
>
> Cc: Ingo Molnar <mingo@redhat.com>
> Cc: Jérôme Glisse <jglisse@redhat.com>
> Cc: Andrew Morton <akpm@linux-foundation.org>
> Reviewed-by: Logan Gunthorpe <logang@deltatee.com>
> Suggested-by: Kirill Shutemov <kirill.shutemov@linux.intel.com>
> Tested-by: Kirill Shutemov <kirill.shutemov@linux.intel.com>
> Signed-off-by: Dan Williams <dan.j.williams@intel.com>
This changelog is lacking an explanation about how this solves the crashes you
were seeing.
Thanks,
Ingo
next prev parent reply other threads:[~2017-04-29 14:18 UTC|newest]
Thread overview: 48+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-04-20 21:46 [tip:x86/mm] x86/mm/gup: Switch GUP to the generic get_user_page_fast() implementation Dan Williams
2017-04-21 14:16 ` Kirill A. Shutemov
2017-04-21 19:30 ` Dan Williams
2017-04-23 9:52 ` [PATCH] Revert "x86/mm/gup: Switch GUP to the generic get_user_page_fast() implementation" Ingo Molnar
2017-04-23 23:31 ` get_zone_device_page() in get_page() and page_cache_get_speculative() Kirill A. Shutemov
2017-04-24 17:23 ` Dan Williams
2017-04-24 17:30 ` Kirill A. Shutemov
2017-04-24 17:47 ` Dan Williams
2017-04-24 18:01 ` Kirill A. Shutemov
2017-04-24 18:25 ` Kirill A. Shutemov
2017-04-24 18:41 ` Dan Williams
2017-04-25 13:19 ` Kirill A. Shutemov
2017-04-25 16:44 ` Dan Williams
2017-04-27 0:55 ` [PATCH] mm, zone_device: replace {get, put}_zone_device_page() with a single reference Dan Williams
2017-04-27 8:33 ` Kirill A. Shutemov
2017-04-28 6:39 ` Ingo Molnar
2017-04-28 8:14 ` [PATCH] mm, zone_device: Replace " Kirill A. Shutemov
2017-04-28 17:23 ` [PATCH v2] mm, zone_device: replace " Dan Williams
2017-04-28 17:34 ` Jerome Glisse
2017-04-28 17:41 ` Dan Williams
2017-04-28 18:00 ` Jerome Glisse
2017-04-28 19:02 ` Dan Williams
2017-04-28 19:16 ` Jerome Glisse
2017-04-28 19:22 ` Dan Williams
2017-04-28 19:33 ` Jerome Glisse
2017-04-29 10:17 ` Kirill A. Shutemov
2017-04-30 23:14 ` Jerome Glisse
2017-05-01 1:42 ` Dan Williams
2017-05-01 1:54 ` Jerome Glisse
2017-05-01 2:40 ` Dan Williams
2017-05-01 3:48 ` Logan Gunthorpe
2017-05-01 10:23 ` Kirill A. Shutemov
2017-05-01 13:55 ` Jerome Glisse
2017-05-01 20:19 ` Dan Williams
2017-05-01 20:32 ` Jerome Glisse
2017-05-02 11:37 ` Kirill A. Shutemov
2017-05-02 13:22 ` Jerome Glisse
2017-04-29 14:18 ` Ingo Molnar [this message]
2017-05-01 2:45 ` Dan Williams
2017-05-01 7:12 ` Ingo Molnar
2017-05-01 9:33 ` Kirill A. Shutemov
2017-05-01 8:28 ` [tip:x86/mm] mm, zone_device: Replace {get, put}_zone_device_page() with a single reference to fix pmem crash tip-bot for Dan Williams
2017-04-27 16:11 ` [PATCH] mm, zone_device: replace {get, put}_zone_device_page() with a single reference Logan Gunthorpe
2017-04-27 16:14 ` Dan Williams
2017-04-27 16:33 ` Logan Gunthorpe
2017-04-27 16:38 ` Dan Williams
2017-04-27 16:45 ` Logan Gunthorpe
2017-04-27 16:46 ` Dan Williams
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