Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753285AbYJTFm6 (ORCPT ); Mon, 20 Oct 2008 01:42:58 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1751767AbYJTFmE (ORCPT ); Mon, 20 Oct 2008 01:42:04 -0400 Received: from serrano.cc.columbia.edu ([128.59.29.6]:58477 "EHLO serrano.cc.columbia.edu" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751501AbYJTFmB (ORCPT ); Mon, 20 Oct 2008 01:42:01 -0400 From: Oren Laadan To: Linus Torvalds Cc: containers@lists.linux-foundation.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, linux-api@vger.kernel.org, Thomas Gleixner , Serge Hallyn , Dave Hansen , Ingo Molnar , "H. Peter Anvin" , Alexander Viro , Oren Laadan Subject: [RFC v7][PATCH 1/9] Create syscalls: sys_checkpoint, sys_restart Date: Mon, 20 Oct 2008 01:40:29 -0400 Message-Id: <1224481237-4892-2-git-send-email-orenl@cs.columbia.edu> X-Mailer: git-send-email 1.6.0.1 In-Reply-To: <1224481237-4892-1-git-send-email-orenl@cs.columbia.edu> References: <1224481237-4892-1-git-send-email-orenl@cs.columbia.edu> X-No-Spam-Score: Local Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 5554 Lines: 169 Create trivial sys_checkpoint and sys_restore system calls. They will enable to checkpoint and restart an entire container, to and from a checkpoint image file descriptor. The syscalls take a file descriptor (for the image file) and flags as arguments. For sys_checkpoint the first argument identifies the target container; for sys_restart it will identify the checkpoint image. Signed-off-by: Oren Laadan Acked-by: Serge Hallyn Signed-off-by: Dave Hansen --- arch/x86/kernel/syscall_table_32.S | 2 + checkpoint/Kconfig | 11 +++++++++ checkpoint/Makefile | 5 ++++ checkpoint/sys.c | 41 ++++++++++++++++++++++++++++++++++++ include/asm-x86/unistd_32.h | 2 + include/linux/syscalls.h | 2 + init/Kconfig | 2 + kernel/sys_ni.c | 4 +++ 8 files changed, 69 insertions(+), 0 deletions(-) create mode 100644 checkpoint/Kconfig create mode 100644 checkpoint/Makefile create mode 100644 checkpoint/sys.c diff --git a/arch/x86/kernel/syscall_table_32.S b/arch/x86/kernel/syscall_table_32.S index d44395f..5543136 100644 --- a/arch/x86/kernel/syscall_table_32.S +++ b/arch/x86/kernel/syscall_table_32.S @@ -332,3 +332,5 @@ ENTRY(sys_call_table) .long sys_dup3 /* 330 */ .long sys_pipe2 .long sys_inotify_init1 + .long sys_checkpoint + .long sys_restart diff --git a/checkpoint/Kconfig b/checkpoint/Kconfig new file mode 100644 index 0000000..ffaa635 --- /dev/null +++ b/checkpoint/Kconfig @@ -0,0 +1,11 @@ +config CHECKPOINT_RESTART + prompt "Enable checkpoint/restart (EXPERIMENTAL)" + def_bool n + depends on X86_32 && EXPERIMENTAL + help + Application checkpoint/restart is the ability to save the + state of a running application so that it can later resume + its execution from the time at which it was checkpointed. + + Turning this option on will enable checkpoint and restart + functionality in the kernel. diff --git a/checkpoint/Makefile b/checkpoint/Makefile new file mode 100644 index 0000000..07d018b --- /dev/null +++ b/checkpoint/Makefile @@ -0,0 +1,5 @@ +# +# Makefile for linux checkpoint/restart. +# + +obj-$(CONFIG_CHECKPOINT_RESTART) += sys.o diff --git a/checkpoint/sys.c b/checkpoint/sys.c new file mode 100644 index 0000000..375129c --- /dev/null +++ b/checkpoint/sys.c @@ -0,0 +1,41 @@ +/* + * Generic container checkpoint-restart + * + * Copyright (C) 2008 Oren Laadan + * + * This file is subject to the terms and conditions of the GNU General Public + * License. See the file COPYING in the main directory of the Linux + * distribution for more details. + */ + +#include +#include + +/** + * sys_checkpoint - checkpoint a container + * @pid: pid of the container init(1) process + * @fd: file to which dump the checkpoint image + * @flags: checkpoint operation flags + * + * Returns positive identifier on success, 0 when returning from restart + * or negative value on error + */ +asmlinkage long sys_checkpoint(pid_t pid, int fd, unsigned long flags) +{ + pr_debug("sys_checkpoint not implemented yet\n"); + return -ENOSYS; +} +/** + * sys_restart - restart a container + * @crid: checkpoint image identifier + * @fd: file from which read the checkpoint image + * @flags: restart operation flags + * + * Returns negative value on error, or otherwise returns in the realm + * of the original checkpoint + */ +asmlinkage long sys_restart(int crid, int fd, unsigned long flags) +{ + pr_debug("sys_restart not implemented yet\n"); + return -ENOSYS; +} diff --git a/include/asm-x86/unistd_32.h b/include/asm-x86/unistd_32.h index d739467..88bdec4 100644 --- a/include/asm-x86/unistd_32.h +++ b/include/asm-x86/unistd_32.h @@ -338,6 +338,8 @@ #define __NR_dup3 330 #define __NR_pipe2 331 #define __NR_inotify_init1 332 +#define __NR_checkpoint 333 +#define __NR_restart 334 #ifdef __KERNEL__ diff --git a/include/linux/syscalls.h b/include/linux/syscalls.h index d6ff145..edc218b 100644 --- a/include/linux/syscalls.h +++ b/include/linux/syscalls.h @@ -622,6 +622,8 @@ asmlinkage long sys_timerfd_gettime(int ufd, struct itimerspec __user *otmr); asmlinkage long sys_eventfd(unsigned int count); asmlinkage long sys_eventfd2(unsigned int count, int flags); asmlinkage long sys_fallocate(int fd, int mode, loff_t offset, loff_t len); +asmlinkage long sys_checkpoint(pid_t pid, int fd, unsigned long flags); +asmlinkage long sys_restart(int crid, int fd, unsigned long flags); int kernel_execve(const char *filename, char *const argv[], char *const envp[]); diff --git a/init/Kconfig b/init/Kconfig index c11da38..fd5f7bf 100644 --- a/init/Kconfig +++ b/init/Kconfig @@ -779,6 +779,8 @@ config MARKERS source "arch/Kconfig" +source "checkpoint/Kconfig" + config PROC_PAGE_MONITOR default y depends on PROC_FS && MMU diff --git a/kernel/sys_ni.c b/kernel/sys_ni.c index 08d6e1b..ca95c25 100644 --- a/kernel/sys_ni.c +++ b/kernel/sys_ni.c @@ -168,3 +168,7 @@ cond_syscall(compat_sys_timerfd_settime); cond_syscall(compat_sys_timerfd_gettime); cond_syscall(sys_eventfd); cond_syscall(sys_eventfd2); + +/* checkpoint/restart */ +cond_syscall(sys_checkpoint); +cond_syscall(sys_restart); -- 1.5.4.3 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/