From: "Kirill A. Shutemov" <kirill-oKw7cIdHH8eLwutG50LtGA@public.gmane.org>
To: Linus Torvalds
<torvalds-de/tnXTf+JLsfHDXvbKv3WD2FQJk+8+b@public.gmane.org>
Cc: Konstantin Khlebnikov
<koct9i-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>,
Mark Williamson
<mwilliamson-/4lU09Eg6ahx67MzidHQgQC/G2K4zDHf@public.gmane.org>,
Mark Seaborn <mseaborn-F7+t8E8rja9g9hUCZPvPmw@public.gmane.org>,
kernel list
<linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>,
"Kirill A. Shutemov"
<kirill.shutemov-VuQAYsv1563Yd54FQh9/CA@public.gmane.org>,
Pavel Emelyanov <xemul-bzQdu9zFT3WakBO8gow8eQ@public.gmane.org>,
Andrew Morton
<akpm-de/tnXTf+JLsfHDXvbKv3WD2FQJk+8+b@public.gmane.org>,
Andy Lutomirski <luto-kltTT9wpgjJwATOyAt5JVQ@public.gmane.org>,
Linux API <linux-api-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>,
Finn Grimwood
<fgrimwood-/4lU09Eg6ahx67MzidHQgQC/G2K4zDHf@public.gmane.org>,
Daniel James
<djames-/4lU09Eg6ahx67MzidHQgQC/G2K4zDHf@public.gmane.org>,
Cyrill Gorcunov
<gorcunov-GEFAQzZX7r8dnm+yROfE0A@public.gmane.org>
Subject: Re: Regression: Requiring CAP_SYS_ADMIN for /proc/<pid>/pagemap causes application-level breakage
Date: Thu, 30 Apr 2015 00:37:44 +0300 [thread overview]
Message-ID: <20150429213744.GA12552@node.dhcp.inet.fi> (raw)
In-Reply-To: <CA+55aFw-dK4U3Z_gi5wEdGsPz0ZaQMizETKqS-=ajpDAu03Fnw-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
On Wed, Apr 29, 2015 at 02:18:49PM -0700, Linus Torvalds wrote:
> On Wed, Apr 29, 2015 at 2:05 PM, Kirill A. Shutemov
> <kirill-oKw7cIdHH8eLwutG50LtGA@public.gmane.org> wrote:
> >
> > This sounds too ugly to be exposed it as ABI.
>
> Oh, pretty it ain't. However, regressions in many ways are worse. If
> it makes it possible to not regress...
One idea is to extend kcmp(2) with KCMP_PAGE. idx1 and idx2 are virtual
addresses in two processes. It returns 0 if addresses points to the same
page and 3 otherwise.
Would it be enough for the use case?
I guess it could be too slow to check one page a time...
Invent new kcmpv(2)? ;)
--
Kirill A. Shutemov
WARNING: multiple messages have this Message-ID (diff)
From: "Kirill A. Shutemov" <kirill@shutemov.name>
To: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Konstantin Khlebnikov <koct9i@gmail.com>,
Mark Williamson <mwilliamson@undo-software.com>,
Mark Seaborn <mseaborn@chromium.org>,
kernel list <linux-kernel@vger.kernel.org>,
"Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>,
Pavel Emelyanov <xemul@parallels.com>,
Andrew Morton <akpm@linux-foundation.org>,
Andy Lutomirski <luto@amacapital.net>,
Linux API <linux-api@vger.kernel.org>,
Finn Grimwood <fgrimwood@undo-software.com>,
Daniel James <djames@undo-software.com>,
Cyrill Gorcunov <gorcunov@openvz.org>
Subject: Re: Regression: Requiring CAP_SYS_ADMIN for /proc/<pid>/pagemap causes application-level breakage
Date: Thu, 30 Apr 2015 00:37:44 +0300 [thread overview]
Message-ID: <20150429213744.GA12552@node.dhcp.inet.fi> (raw)
In-Reply-To: <CA+55aFw-dK4U3Z_gi5wEdGsPz0ZaQMizETKqS-=ajpDAu03Fnw@mail.gmail.com>
On Wed, Apr 29, 2015 at 02:18:49PM -0700, Linus Torvalds wrote:
> On Wed, Apr 29, 2015 at 2:05 PM, Kirill A. Shutemov
> <kirill@shutemov.name> wrote:
> >
> > This sounds too ugly to be exposed it as ABI.
>
> Oh, pretty it ain't. However, regressions in many ways are worse. If
> it makes it possible to not regress...
One idea is to extend kcmp(2) with KCMP_PAGE. idx1 and idx2 are virtual
addresses in two processes. It returns 0 if addresses points to the same
page and 3 otherwise.
Would it be enough for the use case?
I guess it could be too slow to check one page a time...
Invent new kcmpv(2)? ;)
--
Kirill A. Shutemov
next prev parent reply other threads:[~2015-04-29 21:37 UTC|newest]
Thread overview: 42+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-04-24 15:01 Regression: Requiring CAP_SYS_ADMIN for /proc/<pid>/pagemap causes application-level breakage Mark Williamson
2015-04-24 15:01 ` Mark Williamson
2015-04-24 15:26 ` Mark Seaborn
2015-04-24 16:43 ` Mark Williamson
[not found] ` <CAEVpBa+vjfR8p_fJQPXyrQCMYJOocQpTHmkTYmj7nOpGcce=Pg-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2015-04-29 18:44 ` Mark Williamson
2015-04-29 18:44 ` Mark Williamson
2015-04-29 19:23 ` Mark Williamson
[not found] ` <CAEVpBa+DPbhZeRsA=+Jnn7f1BqVZm9SU=ABjy6bAHbbMi_yn+g-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2015-04-29 19:36 ` Kirill A. Shutemov
2015-04-29 19:36 ` Kirill A. Shutemov
[not found] ` <20150429193622.GA11892-nhfs4B5ZimeFUdmeq17FyvUpdFzICT1y@public.gmane.org>
2015-04-29 20:24 ` Mark Williamson
2015-04-29 20:24 ` Mark Williamson
2015-04-29 20:33 ` Linus Torvalds
2015-04-29 20:33 ` Linus Torvalds
2015-04-29 20:44 ` Konstantin Khlebnikov
2015-04-29 21:02 ` Linus Torvalds
2015-04-29 21:05 ` Kirill A. Shutemov
2015-04-29 21:05 ` Kirill A. Shutemov
[not found] ` <20150429210513.GA12431-nhfs4B5ZimeFUdmeq17FyvUpdFzICT1y@public.gmane.org>
2015-04-29 21:18 ` Linus Torvalds
2015-04-29 21:18 ` Linus Torvalds
[not found] ` <CA+55aFw-dK4U3Z_gi5wEdGsPz0ZaQMizETKqS-=ajpDAu03Fnw-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2015-04-29 21:37 ` Kirill A. Shutemov [this message]
2015-04-29 21:37 ` Kirill A. Shutemov
2015-04-30 11:43 ` Konstantin Khlebnikov
2015-04-30 11:43 ` Konstantin Khlebnikov
[not found] ` <CALYGNiOcb2Z+zBVQ0Z058Z7+jp3EixYq8MK1f3MYYXOpT9iAiw-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2015-04-30 13:11 ` Konstantin Khlebnikov
2015-04-30 13:11 ` Konstantin Khlebnikov
[not found] ` <CALYGNiNVvVUuXvRX2nTtcDA8a8uWdQNVJ4bb2HgCY2efeDJrRw-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2015-04-30 13:22 ` Kirill A. Shutemov
2015-04-30 13:22 ` Kirill A. Shutemov
[not found] ` <20150430132230.GE15874-nhfs4B5ZimeFUdmeq17FyvUpdFzICT1y@public.gmane.org>
2015-04-30 13:32 ` Konstantin Khlebnikov
2015-04-30 13:32 ` Konstantin Khlebnikov
2015-04-30 18:45 ` Mark Williamson
2015-04-30 18:45 ` Mark Williamson
2015-04-30 18:32 ` Mark Williamson
2015-04-30 18:32 ` Mark Williamson
2015-04-30 11:50 ` Mark Williamson
2015-04-30 11:50 ` Mark Williamson
[not found] <CAEVpBa+7Yp+zCTczZqBd6Qp_uM7yy0i8YZfZkUbDeUsPpKtqRQ@mail.gmail.com>
2015-04-24 16:08 ` Linus Torvalds
2015-04-24 16:10 ` Andy Lutomirski
[not found] ` <CALCETrUkkbZaNGkcZMenciC7o9BO7U52LPXQwT+Q5TT8W2=uKQ-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2015-04-24 16:27 ` Linus Torvalds
2015-04-24 16:27 ` Linus Torvalds
2015-04-29 14:38 ` Mark Williamson
[not found] ` <CA+55aFymwdHBs02GQkqQYwYF9Ru5dMKd4=2whLUfPwZSPU7ZGA-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2015-04-24 16:46 ` Mark Williamson
2015-04-24 16:46 ` Mark Williamson
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