From: "Kirill A. Shutemov" <kirill@shutemov.name>
To: Konstantin Khlebnikov <khlebnikov@yandex-team.ru>
Cc: linux-mm@kvack.org, Naoya Horiguchi <n-horiguchi@ah.jp.nec.com>,
linux-kernel@vger.kernel.org,
Andrew Morton <akpm@linux-foundation.org>,
Mark Williamson <mwilliamson@undo-software.com>,
Pavel Emelyanov <xemul@parallels.com>,
linux-api@vger.kernel.org, Andy Lutomirski <luto@amacapital.net>,
Vlastimil Babka <vbabka@suse.cz>, Pavel Machek <pavel@ucw.cz>,
Mark Seaborn <mseaborn@chromium.org>,
Linus Torvalds <torvalds@linux-foundation.org>,
Daniel James <djames@undo-software.com>,
Finn Grimwood <fgrimwood@undo-software.com>
Subject: Re: [PATCH v2 1/3] pagemap: add mmap-exclusive bit for marking pages mapped only here
Date: Tue, 12 May 2015 13:40:55 +0300 [thread overview]
Message-ID: <20150512104055.GB18365@node.dhcp.inet.fi> (raw)
In-Reply-To: <20150512094303.24768.10282.stgit@buzz>
On Tue, May 12, 2015 at 12:43:03PM +0300, Konstantin Khlebnikov wrote:
> This patch sets bit 56 in pagemap if this page is mapped only once.
> It allows to detect exclusively used pages without exposing PFN:
>
> present file exclusive state
> 0 0 0 non-present
> 1 1 0 file page mapped somewhere else
> 1 1 1 file page mapped only here
> 1 0 0 anon non-CoWed page (shared with parent/child)
> 1 0 1 anon CoWed page (or never forked)
Probably, worth noting that file-private pages are anon in this context.
--
Kirill A. Shutemov
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WARNING: multiple messages have this Message-ID (diff)
From: "Kirill A. Shutemov" <kirill@shutemov.name>
To: Konstantin Khlebnikov <khlebnikov@yandex-team.ru>
Cc: linux-mm@kvack.org, Naoya Horiguchi <n-horiguchi@ah.jp.nec.com>,
linux-kernel@vger.kernel.org,
Andrew Morton <akpm@linux-foundation.org>,
Mark Williamson <mwilliamson@undo-software.com>,
Pavel Emelyanov <xemul@parallels.com>,
linux-api@vger.kernel.org, Andy Lutomirski <luto@amacapital.net>,
Vlastimil Babka <vbabka@suse.cz>, Pavel Machek <pavel@ucw.cz>,
Mark Seaborn <mseaborn@chromium.org>,
Linus Torvalds <torvalds@linux-foundation.org>,
Daniel James <djames@undo-software.com>,
Finn Grimwood <fgrimwood@undo-software.com>
Subject: Re: [PATCH v2 1/3] pagemap: add mmap-exclusive bit for marking pages mapped only here
Date: Tue, 12 May 2015 13:40:55 +0300 [thread overview]
Message-ID: <20150512104055.GB18365@node.dhcp.inet.fi> (raw)
In-Reply-To: <20150512094303.24768.10282.stgit@buzz>
On Tue, May 12, 2015 at 12:43:03PM +0300, Konstantin Khlebnikov wrote:
> This patch sets bit 56 in pagemap if this page is mapped only once.
> It allows to detect exclusively used pages without exposing PFN:
>
> present file exclusive state
> 0 0 0 non-present
> 1 1 0 file page mapped somewhere else
> 1 1 1 file page mapped only here
> 1 0 0 anon non-CoWed page (shared with parent/child)
> 1 0 1 anon CoWed page (or never forked)
Probably, worth noting that file-private pages are anon in this context.
--
Kirill A. Shutemov
next prev parent reply other threads:[~2015-05-12 10:40 UTC|newest]
Thread overview: 43+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-05-12 9:43 [PATCH RFC 0/3] pagemap: make useable for non-privilege users Konstantin Khlebnikov
2015-05-12 9:43 ` Konstantin Khlebnikov
2015-05-12 9:43 ` [PATCH v2 1/3] pagemap: add mmap-exclusive bit for marking pages mapped only here Konstantin Khlebnikov
2015-05-12 9:43 ` Konstantin Khlebnikov
2015-05-12 10:40 ` Kirill A. Shutemov [this message]
2015-05-12 10:40 ` Kirill A. Shutemov
2015-05-13 10:59 ` Konstantin Khlebnikov
2015-05-13 10:59 ` Konstantin Khlebnikov
2015-05-12 12:05 ` Mark Williamson
2015-05-12 12:05 ` Mark Williamson
[not found] ` <CAEVpBaLm9eicuFPmyRLa7GddLwtBJh3XzHT=fxj-h0YwwmXQOg-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2015-05-13 10:51 ` Konstantin Khlebnikov
2015-05-13 10:51 ` Konstantin Khlebnikov
2015-05-13 10:51 ` Konstantin Khlebnikov
[not found] ` <55532CB0.6070400-XoJtRXgx1JseBXzfvpsJ4g@public.gmane.org>
2015-05-14 18:50 ` Mark Williamson
2015-05-14 18:50 ` Mark Williamson
2015-05-14 18:50 ` Mark Williamson
[not found] ` <CAEVpBa+r6AuB7hnCnTm8YKHzaj172q7Wy89yT=P_F6GQG-3-1A-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2015-05-15 9:39 ` Konstantin Khlebnikov
2015-05-15 9:39 ` Konstantin Khlebnikov
2015-05-15 9:39 ` Konstantin Khlebnikov
2015-05-12 9:43 ` [PATCH v2 2/3] pagemap: hide physical addresses from non-privileged users Konstantin Khlebnikov
2015-05-12 9:43 ` Konstantin Khlebnikov
2015-05-12 9:43 ` Konstantin Khlebnikov
2015-05-12 11:22 ` Mark Williamson
2015-05-12 11:22 ` Mark Williamson
2015-05-12 11:22 ` Mark Williamson
2015-05-12 15:06 ` Linus Torvalds
2015-05-12 15:06 ` Linus Torvalds
2015-05-12 15:41 ` Konstantin Khlebnikov
2015-05-12 15:41 ` Konstantin Khlebnikov
2015-05-12 9:43 ` [PATCH v2 3/3] pagemap: switch to the new format and do some cleanup Konstantin Khlebnikov
2015-05-12 9:43 ` Konstantin Khlebnikov
2015-05-12 10:54 ` Kirill A. Shutemov
2015-05-12 10:54 ` Kirill A. Shutemov
2015-05-13 11:39 ` Konstantin Khlebnikov
2015-05-13 11:39 ` Konstantin Khlebnikov
2015-05-12 11:13 ` [PATCH RFC 0/3] pagemap: make useable for non-privilege users Mark Williamson
2015-05-12 11:13 ` Mark Williamson
[not found] ` <CAEVpBa+-wwf5Q3CwQAAad3V0pJ+uD50uaHKW=EnChLDLOLSAGg-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2015-05-14 18:40 ` Mark Williamson
2015-05-14 18:40 ` Mark Williamson
2015-05-14 18:40 ` Mark Williamson
[not found] ` <CAEVpBaLPDa8tacKKeHmcLMdmYZ86aZBfGqCnAcQ8R=JKSUoagQ-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2015-06-08 12:53 ` Mark Williamson
2015-06-08 12:53 ` Mark Williamson
2015-06-08 12:53 ` Mark Williamson
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