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: <CAKgNAkhtm0JqxeKXovoXPbApogMsGtMR=1td_NhT3AMv_Ot1Ng@mail.gmail.com>
Date:   Wed, 22 Nov 2017 21:43:31 +0100
From:   "Michael Kerrisk (man-pages)" <mtk.manpages@...il.com>
To:     Mike Rapoport <rppt@...ux.vnet.ibm.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

Hi Mike,

On 22 November 2017 at 20:36, Mike Rapoport <rppt@...ux.vnet.ibm.com> wrote:
> From: Yossi Kuperman <yossiku@...ibm.com>
>
> 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?

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/