83224b0837
This patch series introduces a cgroup subsystem that utilizes the swsusp freezer to freeze a group of tasks. It's immediately useful for batch job management scripts. It should also be useful in the future for implementing container checkpoint/restart. The freezer subsystem in the container filesystem defines a cgroup file named freezer.state. Reading freezer.state will return the current state of the cgroup. Writing "FROZEN" to the state file will freeze all tasks in the cgroup. Subsequently writing "RUNNING" will unfreeze the tasks in the cgroup. * Examples of usage : # mkdir /containers/freezer # mount -t cgroup -ofreezer freezer /containers # mkdir /containers/0 # echo $some_pid > /containers/0/tasks to get status of the freezer subsystem : # cat /containers/0/freezer.state RUNNING to freeze all tasks in the container : # echo FROZEN > /containers/0/freezer.state # cat /containers/0/freezer.state FREEZING # cat /containers/0/freezer.state FROZEN to unfreeze all tasks in the container : # echo RUNNING > /containers/0/freezer.state # cat /containers/0/freezer.state RUNNING This patch: The first step in making the refrigerator() available to all architectures, even for those without power management. The purpose of such a change is to be able to use the refrigerator() in a new control group subsystem which will implement a control group freezer. [akpm@linux-foundation.org: fix sparc] Signed-off-by: Cedric Le Goater <clg@fr.ibm.com> Signed-off-by: Matt Helsley <matthltc@us.ibm.com> Acked-by: Pavel Machek <pavel@suse.cz> Acked-by: Serge E. Hallyn <serue@us.ibm.com> Acked-by: Rafael J. Wysocki <rjw@sisk.pl> Acked-by: Nigel Cunningham <nigel@tuxonice.net> Tested-by: Matt Helsley <matthltc@us.ibm.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
117 lines
3.6 KiB
C
117 lines
3.6 KiB
C
#ifndef _ALPHA_THREAD_INFO_H
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#define _ALPHA_THREAD_INFO_H
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#ifdef __KERNEL__
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#ifndef __ASSEMBLY__
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#include <asm/processor.h>
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#include <asm/types.h>
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#include <asm/hwrpb.h>
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#endif
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#ifndef __ASSEMBLY__
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struct thread_info {
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struct pcb_struct pcb; /* palcode state */
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struct task_struct *task; /* main task structure */
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unsigned int flags; /* low level flags */
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unsigned int ieee_state; /* see fpu.h */
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struct exec_domain *exec_domain; /* execution domain */
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mm_segment_t addr_limit; /* thread address space */
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unsigned cpu; /* current CPU */
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int preempt_count; /* 0 => preemptable, <0 => BUG */
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int bpt_nsaved;
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unsigned long bpt_addr[2]; /* breakpoint handling */
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unsigned int bpt_insn[2];
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struct restart_block restart_block;
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};
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/*
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* Macros/functions for gaining access to the thread information structure.
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*/
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#define INIT_THREAD_INFO(tsk) \
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{ \
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.task = &tsk, \
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.exec_domain = &default_exec_domain, \
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.addr_limit = KERNEL_DS, \
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.restart_block = { \
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.fn = do_no_restart_syscall, \
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}, \
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}
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#define init_thread_info (init_thread_union.thread_info)
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#define init_stack (init_thread_union.stack)
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/* How to get the thread information struct from C. */
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register struct thread_info *__current_thread_info __asm__("$8");
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#define current_thread_info() __current_thread_info
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/* Thread information allocation. */
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#define THREAD_SIZE_ORDER 1
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#define THREAD_SIZE (2*PAGE_SIZE)
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#endif /* __ASSEMBLY__ */
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#define PREEMPT_ACTIVE 0x40000000
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/*
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* Thread information flags:
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* - these are process state flags and used from assembly
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* - pending work-to-be-done flags come first to fit in and immediate operand.
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*
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* TIF_SYSCALL_TRACE is known to be 0 via blbs.
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*/
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#define TIF_SYSCALL_TRACE 0 /* syscall trace active */
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#define TIF_SIGPENDING 1 /* signal pending */
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#define TIF_NEED_RESCHED 2 /* rescheduling necessary */
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#define TIF_POLLING_NRFLAG 3 /* poll_idle is polling NEED_RESCHED */
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#define TIF_DIE_IF_KERNEL 4 /* dik recursion lock */
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#define TIF_UAC_NOPRINT 5 /* see sysinfo.h */
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#define TIF_UAC_NOFIX 6
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#define TIF_UAC_SIGBUS 7
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#define TIF_MEMDIE 8
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#define TIF_RESTORE_SIGMASK 9 /* restore signal mask in do_signal */
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#define TIF_FREEZE 16 /* is freezing for suspend */
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#define _TIF_SYSCALL_TRACE (1<<TIF_SYSCALL_TRACE)
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#define _TIF_SIGPENDING (1<<TIF_SIGPENDING)
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#define _TIF_NEED_RESCHED (1<<TIF_NEED_RESCHED)
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#define _TIF_POLLING_NRFLAG (1<<TIF_POLLING_NRFLAG)
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#define _TIF_RESTORE_SIGMASK (1<<TIF_RESTORE_SIGMASK)
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#define _TIF_FREEZE (1<<TIF_FREEZE)
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/* Work to do on interrupt/exception return. */
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#define _TIF_WORK_MASK (_TIF_SIGPENDING | _TIF_NEED_RESCHED)
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/* Work to do on any return to userspace. */
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#define _TIF_ALLWORK_MASK (_TIF_WORK_MASK \
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| _TIF_SYSCALL_TRACE)
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#define ALPHA_UAC_SHIFT 6
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#define ALPHA_UAC_MASK (1 << TIF_UAC_NOPRINT | 1 << TIF_UAC_NOFIX | \
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1 << TIF_UAC_SIGBUS)
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#define SET_UNALIGN_CTL(task,value) ({ \
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task_thread_info(task)->flags = ((task_thread_info(task)->flags & \
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~ALPHA_UAC_MASK) \
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| (((value) << ALPHA_UAC_SHIFT) & (1<<TIF_UAC_NOPRINT))\
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| (((value) << (ALPHA_UAC_SHIFT + 1)) & (1<<TIF_UAC_SIGBUS)) \
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| (((value) << (ALPHA_UAC_SHIFT - 1)) & (1<<TIF_UAC_NOFIX)));\
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0; })
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#define GET_UNALIGN_CTL(task,value) ({ \
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put_user((task_thread_info(task)->flags & (1 << TIF_UAC_NOPRINT))\
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>> ALPHA_UAC_SHIFT \
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| (task_thread_info(task)->flags & (1 << TIF_UAC_SIGBUS))\
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>> (ALPHA_UAC_SHIFT + 1) \
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| (task_thread_info(task)->flags & (1 << TIF_UAC_NOFIX))\
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>> (ALPHA_UAC_SHIFT - 1), \
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(int __user *)(value)); \
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})
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#endif /* __KERNEL__ */
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#endif /* _ALPHA_THREAD_INFO_H */
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