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From: Mike Rapoport <rppt@linux.vnet.ibm.com>
To: Andrew Morton <akpm@linux-foundation.org>,
	Alexander Viro <viro@zeniv.linux.org.uk>
Cc: linux-mm@kvack.org, linux-fsdevel@vger.kernel.org,
	linux-kernel@vger.kernel.org, linux-api@vger.kernel.org,
	criu@openvz.org, Arnd Bergmann <arnd@arndb.de>,
	Pavel Emelyanov <xemul@virtuozzo.com>,
	Michael Kerrisk <mtk.manpages@gmail.com>,
	Thomas Gleixner <tglx@linutronix.de>,
	Josh Triplett <josh@joshtriplett.org>,
	Jann Horn <jannh@google.com>, Yossi Kuperman <yossiku@il.ibm.com>
Subject: [PATCH v3 0/4] vm: add a syscall to map a process memory into a pipe
Date: Wed, 22 Nov 2017 21:36:27 +0200	[thread overview]
Message-ID: <1511379391-988-1-git-send-email-rppt@linux.vnet.ibm.com> (raw)

From: Yossi Kuperman <yossiku@il.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.

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

             reply	other threads:[~2017-11-22 19:36 UTC|newest]

Thread overview: 9+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2017-11-22 19:36 Mike Rapoport [this message]
     [not found] ` <1511379391-988-1-git-send-email-rppt-23VcF4HTsmIX0ybBhKVfKdBPR1lH4CV8@public.gmane.org>
2017-11-22 19:36   ` [PATCH v3 1/4] fs/splice: introduce pages_to_pipe helper Mike Rapoport
2017-11-22 19:36 ` [PATCH v3 2/4] vm: add a syscall to map a process memory into a pipe Mike Rapoport
2017-11-22 19:36 ` [PATCH v3 3/4] x86: wire up the process_vmsplice syscall Mike Rapoport
2017-11-22 19:36 ` [PATCH v3 4/4] test: add a test for " Mike Rapoport
     [not found]   ` <1511379391-988-5-git-send-email-rppt-23VcF4HTsmIX0ybBhKVfKdBPR1lH4CV8@public.gmane.org>
2017-11-23  8:01     ` Greg KH
2017-11-23 14:07       ` Mike Rapoport
2017-11-22 20:43 ` [PATCH v3 0/4] vm: add a syscall to map a process memory into a pipe Michael Kerrisk (man-pages)
2017-11-23  6:29   ` Mike Rapoport

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