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https://github.com/torvalds/linux
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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>
157 lines
4.6 KiB
C
157 lines
4.6 KiB
C
/*
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* thread_info.h: sparc low-level thread information
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* adapted from the ppc version by Pete Zaitcev, which was
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* adapted from the i386 version by Paul Mackerras
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*
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* Copyright (C) 2002 David Howells (dhowells@redhat.com)
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* Copyright (c) 2002 Pete Zaitcev (zaitcev@yahoo.com)
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* - Incorporating suggestions made by Linus Torvalds and Dave Miller
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*/
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#ifndef _ASM_THREAD_INFO_H
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#define _ASM_THREAD_INFO_H
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#ifdef __KERNEL__
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#ifndef __ASSEMBLY__
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#include <asm/btfixup.h>
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#include <asm/ptrace.h>
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#include <asm/page.h>
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/*
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* Low level task data.
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*
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* If you change this, change the TI_* offsets below to match.
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*/
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#define NSWINS 8
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struct thread_info {
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unsigned long uwinmask;
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struct task_struct *task; /* main task structure */
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struct exec_domain *exec_domain; /* execution domain */
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unsigned long flags; /* low level flags */
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int cpu; /* cpu we're on */
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int preempt_count; /* 0 => preemptable,
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<0 => BUG */
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int softirq_count;
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int hardirq_count;
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/* Context switch saved kernel state. */
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unsigned long ksp; /* ... ksp __attribute__ ((aligned (8))); */
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unsigned long kpc;
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unsigned long kpsr;
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unsigned long kwim;
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/* A place to store user windows and stack pointers
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* when the stack needs inspection.
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*/
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struct reg_window reg_window[NSWINS]; /* align for ldd! */
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unsigned long rwbuf_stkptrs[NSWINS];
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unsigned long w_saved;
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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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* preempt_count needs to be 1 initially, until the scheduler is functional.
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*/
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#define INIT_THREAD_INFO(tsk) \
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{ \
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.uwinmask = 0, \
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.task = &tsk, \
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.exec_domain = &default_exec_domain, \
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.flags = 0, \
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.cpu = 0, \
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.preempt_count = 1, \
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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_reg asm("g6");
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#define current_thread_info() (current_thread_info_reg)
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/*
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* thread information allocation
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*/
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#define THREAD_INFO_ORDER 1
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#define __HAVE_ARCH_THREAD_INFO_ALLOCATOR
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BTFIXUPDEF_CALL(struct thread_info *, alloc_thread_info, void)
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#define alloc_thread_info(tsk) BTFIXUP_CALL(alloc_thread_info)()
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BTFIXUPDEF_CALL(void, free_thread_info, struct thread_info *)
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#define free_thread_info(ti) BTFIXUP_CALL(free_thread_info)(ti)
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#endif /* __ASSEMBLY__ */
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/*
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* Size of kernel stack for each process.
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* Observe the order of get_free_pages() in alloc_thread_info().
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* The sun4 has 8K stack too, because it's short on memory, and 16K is a waste.
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*/
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#define THREAD_SIZE 8192
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/*
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* Offsets in thread_info structure, used in assembly code
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* The "#define REGWIN_SZ 0x40" was abolished, so no multiplications.
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*/
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#define TI_UWINMASK 0x00 /* uwinmask */
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#define TI_TASK 0x04
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#define TI_EXECDOMAIN 0x08 /* exec_domain */
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#define TI_FLAGS 0x0c
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#define TI_CPU 0x10
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#define TI_PREEMPT 0x14 /* preempt_count */
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#define TI_SOFTIRQ 0x18 /* softirq_count */
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#define TI_HARDIRQ 0x1c /* hardirq_count */
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#define TI_KSP 0x20 /* ksp */
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#define TI_KPC 0x24 /* kpc (ldd'ed with kpc) */
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#define TI_KPSR 0x28 /* kpsr */
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#define TI_KWIM 0x2c /* kwim (ldd'ed with kpsr) */
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#define TI_REG_WINDOW 0x30
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#define TI_RWIN_SPTRS 0x230
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#define TI_W_SAVED 0x250
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/* #define TI_RESTART_BLOCK 0x25n */ /* Nobody cares */
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#define PREEMPT_ACTIVE 0x4000000
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/*
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* thread information flag bit numbers
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*/
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#define TIF_SYSCALL_TRACE 0 /* syscall trace active */
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#define TIF_NOTIFY_RESUME 1 /* callback before returning to user */
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#define TIF_SIGPENDING 2 /* signal pending */
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#define TIF_NEED_RESCHED 3 /* rescheduling necessary */
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#define TIF_RESTORE_SIGMASK 4 /* restore signal mask in do_signal() */
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#define TIF_USEDFPU 8 /* FPU was used by this task
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* this quantum (SMP) */
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#define TIF_POLLING_NRFLAG 9 /* true if poll_idle() is polling
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* TIF_NEED_RESCHED */
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#define TIF_MEMDIE 10
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#define TIF_FREEZE 11 /* is freezing for suspend */
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/* as above, but as bit values */
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#define _TIF_SYSCALL_TRACE (1<<TIF_SYSCALL_TRACE)
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#define _TIF_NOTIFY_RESUME (1<<TIF_NOTIFY_RESUME)
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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_RESTORE_SIGMASK (1<<TIF_RESTORE_SIGMASK)
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#define _TIF_USEDFPU (1<<TIF_USEDFPU)
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#define _TIF_POLLING_NRFLAG (1<<TIF_POLLING_NRFLAG)
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#define _TIF_DO_NOTIFY_RESUME_MASK (_TIF_NOTIFY_RESUME | \
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_TIF_SIGPENDING | \
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_TIF_RESTORE_SIGMASK)
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#define _TIF_FREEZE (1<<TIF_FREEZE)
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#endif /* __KERNEL__ */
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#endif /* _ASM_THREAD_INFO_H */
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