[RFC PATCH v3 0/2] mempinfd: Add new syscall to provide memory pin

Zhou Wang
2021-02-07T08:33:37Z

This series adds a new mempinfd syscall to offer a common way to pin/unpin
memory.

Patch 1/2 is about mempinfd codes.
Patch 2/2 adds a simple test tool about mempinfd.

Change logs:
------------
v2 -> v3:
- Follow suggestions from Greg and Kevin, add a new syscall.
- Add input check.
- Use xa_insert to replace xa_store.
- Add lock to pretect pin and xa_insert.
v1 -> v2:
- Some tiny fixes.
- Follow Greg's suggestion to get mm-list and iommu-list involved.

Links:
------
- v2: https://www.spinics.net/lists/kernel/msg3808926.html
- v1: https://www.spinics.net/lists/kernel/msg3805205.html

Zhou Wang (2):
mempinfd: Add new syscall to provide memory pin
selftests/vm: add mempinfd test

arch/arm64/include/asm/unistd.h | 2 +-
arch/arm64/include/asm/unistd32.h | 2 +
fs/Makefile | 1 +
fs/mempinfd.c | 199 ++++++++++++++++++++++++++++++++++
include/linux/syscalls.h | 1 +
include/uapi/asm-generic/unistd.h | 4 +-
include/uapi/linux/mempinfd.h | 23 ++++
init/Kconfig | 6 +
tools/testing/selftests/vm/Makefile | 1 +
tools/testing/selftests/vm/mempinfd.c | 131 ++++++++++++++++++++++
10 files changed, 368 insertions(+), 2 deletions(-)
create mode 100644 fs/mempinfd.c
create mode 100644 include/uapi/linux/mempinfd.h
create mode 100644 tools/testing/selftests/vm/mempinfd.c

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2.8.1