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 -- 2.8.1
