Messages in this thread Patch in this message | | | Subject | [PATCH 1/9] Create syscalls: sys_checkpoint, sys_restart | From | Dave Hansen <> | Date | Thu, 16 Oct 2008 11:14:15 -0700 |
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From: Oren Laadan <orenl@cs.columbia.edu>
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 <orenl@cs.columbia.edu> Acked-by: Serge Hallyn <serue@us.ibm.com> Signed-off-by: Dave Hansen <dave@linux.vnet.ibm.com> ---
linux-2.6.git-dave/arch/x86/kernel/syscall_table_32.S | 2 linux-2.6.git-dave/checkpoint/Kconfig | 11 ++++ linux-2.6.git-dave/checkpoint/Makefile | 5 ++ linux-2.6.git-dave/checkpoint/sys.c | 41 ++++++++++++++++++ linux-2.6.git-dave/include/asm-x86/unistd_32.h | 2 linux-2.6.git-dave/include/linux/syscalls.h | 2 linux-2.6.git-dave/init/Kconfig | 2 linux-2.6.git-dave/kernel/sys_ni.c | 4 + 8 files changed, 69 insertions(+)
diff -puN arch/x86/kernel/syscall_table_32.S~v6_PATCH_1_9_Create_syscalls-_sys_checkpoint_sys_restart arch/x86/kernel/syscall_table_32.S --- linux-2.6.git/arch/x86/kernel/syscall_table_32.S~v6_PATCH_1_9_Create_syscalls-_sys_checkpoint_sys_restart 2008-10-16 10:53:33.000000000 -0700 +++ linux-2.6.git-dave/arch/x86/kernel/syscall_table_32.S 2008-10-16 10:53:33.000000000 -0700 @@ -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 -puN /dev/null checkpoint/Kconfig --- /dev/null 2008-09-02 09:40:19.000000000 -0700 +++ linux-2.6.git-dave/checkpoint/Kconfig 2008-10-16 10:53:33.000000000 -0700 @@ -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 -puN /dev/null checkpoint/Makefile --- /dev/null 2008-09-02 09:40:19.000000000 -0700 +++ linux-2.6.git-dave/checkpoint/Makefile 2008-10-16 10:53:33.000000000 -0700 @@ -0,0 +1,5 @@ +# +# Makefile for linux checkpoint/restart. +# + +obj-$(CONFIG_CHECKPOINT_RESTART) += sys.o diff -puN /dev/null checkpoint/sys.c --- /dev/null 2008-09-02 09:40:19.000000000 -0700 +++ linux-2.6.git-dave/checkpoint/sys.c 2008-10-16 10:53:33.000000000 -0700 @@ -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 <linux/sched.h> +#include <linux/kernel.h> + +/** + * 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 -puN include/asm-x86/unistd_32.h~v6_PATCH_1_9_Create_syscalls-_sys_checkpoint_sys_restart include/asm-x86/unistd_32.h --- linux-2.6.git/include/asm-x86/unistd_32.h~v6_PATCH_1_9_Create_syscalls-_sys_checkpoint_sys_restart 2008-10-16 10:53:33.000000000 -0700 +++ linux-2.6.git-dave/include/asm-x86/unistd_32.h 2008-10-16 10:53:33.000000000 -0700 @@ -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 -puN include/linux/syscalls.h~v6_PATCH_1_9_Create_syscalls-_sys_checkpoint_sys_restart include/linux/syscalls.h --- linux-2.6.git/include/linux/syscalls.h~v6_PATCH_1_9_Create_syscalls-_sys_checkpoint_sys_restart 2008-10-16 10:53:33.000000000 -0700 +++ linux-2.6.git-dave/include/linux/syscalls.h 2008-10-16 10:53:33.000000000 -0700 @@ -622,6 +622,8 @@ asmlinkage long sys_timerfd_gettime(int 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 -puN init/Kconfig~v6_PATCH_1_9_Create_syscalls-_sys_checkpoint_sys_restart init/Kconfig --- linux-2.6.git/init/Kconfig~v6_PATCH_1_9_Create_syscalls-_sys_checkpoint_sys_restart 2008-10-16 10:53:33.000000000 -0700 +++ linux-2.6.git-dave/init/Kconfig 2008-10-16 10:53:33.000000000 -0700 @@ -779,6 +779,8 @@ config MARKERS source "arch/Kconfig" +source "checkpoint/Kconfig" + endmenu # General setup config HAVE_GENERIC_DMA_COHERENT diff -puN kernel/sys_ni.c~v6_PATCH_1_9_Create_syscalls-_sys_checkpoint_sys_restart kernel/sys_ni.c --- linux-2.6.git/kernel/sys_ni.c~v6_PATCH_1_9_Create_syscalls-_sys_checkpoint_sys_restart 2008-10-16 10:53:33.000000000 -0700 +++ linux-2.6.git-dave/kernel/sys_ni.c 2008-10-16 10:53:33.000000000 -0700 @@ -169,3 +169,7 @@ 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); _
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