linux-kernel - Re: [PATCH v3 0/4] vm: add a syscall to map a process memory into a pipe

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Message-Id: <20171123062909.GB2303@rapoport-lnx>
Date:   Thu, 23 Nov 2017 08:29:10 +0200
From:   Mike Rapoport <rppt@...ux.vnet.ibm.com>
To:     "Michael Kerrisk (man-pages)" <mtk.manpages@...il.com>
Cc:     Andrew Morton <akpm@...ux-foundation.org>,
        Alexander Viro <viro@...iv.linux.org.uk>,
        "linux-mm@...ck.org" <linux-mm@...ck.org>,
        "linux-fsdevel@...r.kernel.org" <linux-fsdevel@...r.kernel.org>,
        lkml <linux-kernel@...r.kernel.org>,
        Linux API <linux-api@...r.kernel.org>, criu@...nvz.org,
        Arnd Bergmann <arnd@...db.de>,
        Pavel Emelyanov <xemul@...tuozzo.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Josh Triplett <josh@...htriplett.org>,
        Jann Horn <jannh@...gle.com>,
        Yossi Kuperman <yossiku@...ibm.com>
Subject: Re: [PATCH v3 0/4] vm: add a syscall to map a process memory into a
 pipe

On Wed, Nov 22, 2017 at 09:43:31PM +0100, Michael Kerrisk (man-pages) wrote:
> Hi Mike,
> 
> On 22 November 2017 at 20:36, Mike Rapoport <rppt@...ux.vnet.ibm.com> wrote:
> > Hi,
> >
> > This patches introduces new process_vmsplice system call that combines
> > functionality of process_vm_read and vmsplice.
> >
> > It allows to map the memory of another process into a pipe, similarly to
> > what vmsplice does for its own address space.
> >
> > The patch 2/4 ("vm: add a syscall to map a process memory into a pipe")
> > actually adds the new system call and provides its elaborate description.
> 
> Where is the man page for this new syscall?

It's still WIP, I'll send it out soon.
 
> Cheers,
> 
> Michael
> 
> > The patchset is against -mm tree.
> >
> > v3: minor refactoring to reduce code duplication
> > v2: move this syscall under CONFIG_CROSS_MEMORY_ATTACH
> >     give correct flags to get_user_pages_remote()
> >
> > Andrei Vagin (3):
> >   vm: add a syscall to map a process memory into a pipe
> >   x86: wire up the process_vmsplice syscall
> >   test: add a test for the process_vmsplice syscall
> >
> > Mike Rapoport (1):
> >   fs/splice: introduce pages_to_pipe helper
> >
> >  arch/x86/entry/syscalls/syscall_32.tbl             |   1 +
> >  arch/x86/entry/syscalls/syscall_64.tbl             |   2 +
> >  fs/splice.c                                        | 262 +++++++++++++++++++--
> >  include/linux/compat.h                             |   3 +
> >  include/linux/syscalls.h                           |   4 +
> >  include/uapi/asm-generic/unistd.h                  |   5 +-
> >  kernel/sys_ni.c                                    |   2 +
> >  tools/testing/selftests/process_vmsplice/Makefile  |   5 +
> >  .../process_vmsplice/process_vmsplice_test.c       | 188 +++++++++++++++
> >  9 files changed, 450 insertions(+), 22 deletions(-)
> >  create mode 100644 tools/testing/selftests/process_vmsplice/Makefile
> >  create mode 100644 tools/testing/selftests/process_vmsplice/process_vmsplice_test.c
> >
> > --
> > 2.7.4
> >
> 
> -- 
> Michael Kerrisk
> Linux man-pages maintainer; http://www.kernel.org/doc/man-pages/
> Linux/UNIX System Programming Training: http://man7.org/training/
> 

-- 
Sincerely yours,
Mike.