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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>
284 lines
8.9 KiB
C
284 lines
8.9 KiB
C
/* thread_info.h: sparc64 low-level thread information
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*
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* Copyright (C) 2002 David S. Miller (davem@redhat.com)
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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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#define NSWINS 7
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#define TI_FLAG_BYTE_FAULT_CODE 0
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#define TI_FLAG_FAULT_CODE_SHIFT 56
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#define TI_FLAG_BYTE_WSTATE 1
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#define TI_FLAG_WSTATE_SHIFT 48
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#define TI_FLAG_BYTE_CWP 2
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#define TI_FLAG_CWP_SHIFT 40
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#define TI_FLAG_BYTE_CURRENT_DS 3
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#define TI_FLAG_CURRENT_DS_SHIFT 32
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#define TI_FLAG_BYTE_FPDEPTH 4
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#define TI_FLAG_FPDEPTH_SHIFT 24
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#define TI_FLAG_BYTE_WSAVED 5
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#define TI_FLAG_WSAVED_SHIFT 16
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#include <asm/page.h>
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#ifndef __ASSEMBLY__
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#include <asm/ptrace.h>
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#include <asm/types.h>
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struct task_struct;
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struct exec_domain;
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struct thread_info {
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/* D$ line 1 */
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struct task_struct *task;
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unsigned long flags;
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__u8 fpsaved[7];
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__u8 status;
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unsigned long ksp;
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/* D$ line 2 */
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unsigned long fault_address;
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struct pt_regs *kregs;
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struct exec_domain *exec_domain;
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int preempt_count; /* 0 => preemptable, <0 => BUG */
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__u8 new_child;
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__u8 syscall_noerror;
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__u16 cpu;
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unsigned long *utraps;
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struct reg_window reg_window[NSWINS];
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unsigned long rwbuf_stkptrs[NSWINS];
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unsigned long gsr[7];
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unsigned long xfsr[7];
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__u64 __user *user_cntd0;
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__u64 __user *user_cntd1;
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__u64 kernel_cntd0, kernel_cntd1;
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__u64 pcr_reg;
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struct restart_block restart_block;
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struct pt_regs *kern_una_regs;
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unsigned int kern_una_insn;
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unsigned long fpregs[0] __attribute__ ((aligned(64)));
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};
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#endif /* !(__ASSEMBLY__) */
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/* offsets into the thread_info struct for assembly code access */
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#define TI_TASK 0x00000000
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#define TI_FLAGS 0x00000008
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#define TI_FAULT_CODE (TI_FLAGS + TI_FLAG_BYTE_FAULT_CODE)
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#define TI_WSTATE (TI_FLAGS + TI_FLAG_BYTE_WSTATE)
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#define TI_CWP (TI_FLAGS + TI_FLAG_BYTE_CWP)
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#define TI_CURRENT_DS (TI_FLAGS + TI_FLAG_BYTE_CURRENT_DS)
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#define TI_FPDEPTH (TI_FLAGS + TI_FLAG_BYTE_FPDEPTH)
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#define TI_WSAVED (TI_FLAGS + TI_FLAG_BYTE_WSAVED)
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#define TI_FPSAVED 0x00000010
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#define TI_KSP 0x00000018
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#define TI_FAULT_ADDR 0x00000020
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#define TI_KREGS 0x00000028
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#define TI_EXEC_DOMAIN 0x00000030
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#define TI_PRE_COUNT 0x00000038
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#define TI_NEW_CHILD 0x0000003c
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#define TI_SYS_NOERROR 0x0000003d
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#define TI_CPU 0x0000003e
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#define TI_UTRAPS 0x00000040
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#define TI_REG_WINDOW 0x00000048
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#define TI_RWIN_SPTRS 0x000003c8
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#define TI_GSR 0x00000400
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#define TI_XFSR 0x00000438
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#define TI_USER_CNTD0 0x00000470
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#define TI_USER_CNTD1 0x00000478
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#define TI_KERN_CNTD0 0x00000480
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#define TI_KERN_CNTD1 0x00000488
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#define TI_PCR 0x00000490
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#define TI_RESTART_BLOCK 0x00000498
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#define TI_KUNA_REGS 0x000004c0
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#define TI_KUNA_INSN 0x000004c8
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#define TI_FPREGS 0x00000500
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/* We embed this in the uppermost byte of thread_info->flags */
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#define FAULT_CODE_WRITE 0x01 /* Write access, implies D-TLB */
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#define FAULT_CODE_DTLB 0x02 /* Miss happened in D-TLB */
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#define FAULT_CODE_ITLB 0x04 /* Miss happened in I-TLB */
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#define FAULT_CODE_WINFIXUP 0x08 /* Miss happened during spill/fill */
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#define FAULT_CODE_BLKCOMMIT 0x10 /* Use blk-commit ASI in copy_page */
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#if PAGE_SHIFT == 13
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#define THREAD_SIZE (2*PAGE_SIZE)
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#define THREAD_SHIFT (PAGE_SHIFT + 1)
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#else /* PAGE_SHIFT == 13 */
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#define THREAD_SIZE PAGE_SIZE
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#define THREAD_SHIFT PAGE_SHIFT
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#endif /* PAGE_SHIFT == 13 */
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#define PREEMPT_ACTIVE 0x4000000
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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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#ifndef __ASSEMBLY__
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#define INIT_THREAD_INFO(tsk) \
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{ \
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.task = &tsk, \
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.flags = ((unsigned long)ASI_P) << TI_FLAG_CURRENT_DS_SHIFT, \
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.exec_domain = &default_exec_domain, \
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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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/* thread information allocation */
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#if PAGE_SHIFT == 13
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#define __THREAD_INFO_ORDER 1
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#else /* PAGE_SHIFT == 13 */
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#define __THREAD_INFO_ORDER 0
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#endif /* PAGE_SHIFT == 13 */
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#define __HAVE_ARCH_THREAD_INFO_ALLOCATOR
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#ifdef CONFIG_DEBUG_STACK_USAGE
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#define alloc_thread_info(tsk) \
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({ \
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struct thread_info *ret; \
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\
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ret = (struct thread_info *) \
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__get_free_pages(GFP_KERNEL, __THREAD_INFO_ORDER); \
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if (ret) \
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memset(ret, 0, PAGE_SIZE<<__THREAD_INFO_ORDER); \
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ret; \
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})
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#else
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#define alloc_thread_info(tsk) \
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((struct thread_info *)__get_free_pages(GFP_KERNEL, __THREAD_INFO_ORDER))
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#endif
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#define free_thread_info(ti) \
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free_pages((unsigned long)(ti),__THREAD_INFO_ORDER)
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#define __thread_flag_byte_ptr(ti) \
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((unsigned char *)(&((ti)->flags)))
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#define __cur_thread_flag_byte_ptr __thread_flag_byte_ptr(current_thread_info())
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#define get_thread_fault_code() (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_FAULT_CODE])
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#define set_thread_fault_code(val) (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_FAULT_CODE] = (val))
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#define get_thread_wstate() (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_WSTATE])
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#define set_thread_wstate(val) (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_WSTATE] = (val))
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#define get_thread_cwp() (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_CWP])
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#define set_thread_cwp(val) (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_CWP] = (val))
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#define get_thread_current_ds() (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_CURRENT_DS])
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#define set_thread_current_ds(val) (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_CURRENT_DS] = (val))
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#define get_thread_fpdepth() (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_FPDEPTH])
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#define set_thread_fpdepth(val) (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_FPDEPTH] = (val))
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#define get_thread_wsaved() (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_WSAVED])
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#define set_thread_wsaved(val) (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_WSAVED] = (val))
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#endif /* !(__ASSEMBLY__) */
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/*
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* Thread information flags, only 16 bits are available as we encode
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* other values into the upper 6 bytes.
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*
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* On trap return we need to test several values:
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*
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* user: need_resched, notify_resume, sigpending, wsaved, perfctr
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* kernel: fpdepth
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*
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* So to check for work in the kernel case we simply load the fpdepth
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* byte out of the flags and test it. For the user case we encode the
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* lower 3 bytes of flags as follows:
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* ----------------------------------------
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* | wsaved | flags byte 1 | flags byte 2 |
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* ----------------------------------------
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* This optimizes the user test into:
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* ldx [%g6 + TI_FLAGS], REG1
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* sethi %hi(_TIF_USER_WORK_MASK), REG2
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* or REG2, %lo(_TIF_USER_WORK_MASK), REG2
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* andcc REG1, REG2, %g0
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* be,pt no_work_to_do
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* nop
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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_PERFCTR 4 /* performance counters active */
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#define TIF_UNALIGNED 5 /* allowed to do unaligned accesses */
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/* flag bit 6 is available */
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#define TIF_32BIT 7 /* 32-bit binary */
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/* flag bit 8 is available */
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#define TIF_SECCOMP 9 /* secure computing */
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#define TIF_SYSCALL_AUDIT 10 /* syscall auditing active */
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/* flag bit 11 is available */
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/* NOTE: Thread flags >= 12 should be ones we have no interest
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* in using in assembly, else we can't use the mask as
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* an immediate value in instructions such as andcc.
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*/
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#define TIF_ABI_PENDING 12
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#define TIF_MEMDIE 13
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#define TIF_POLLING_NRFLAG 14
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#define TIF_FREEZE 15 /* is freezing for suspend */
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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_PERFCTR (1<<TIF_PERFCTR)
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#define _TIF_UNALIGNED (1<<TIF_UNALIGNED)
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#define _TIF_32BIT (1<<TIF_32BIT)
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#define _TIF_SECCOMP (1<<TIF_SECCOMP)
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#define _TIF_SYSCALL_AUDIT (1<<TIF_SYSCALL_AUDIT)
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#define _TIF_ABI_PENDING (1<<TIF_ABI_PENDING)
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#define _TIF_POLLING_NRFLAG (1<<TIF_POLLING_NRFLAG)
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#define _TIF_FREEZE (1<<TIF_FREEZE)
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#define _TIF_USER_WORK_MASK ((0xff << TI_FLAG_WSAVED_SHIFT) | \
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_TIF_DO_NOTIFY_RESUME_MASK | \
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_TIF_NEED_RESCHED | _TIF_PERFCTR)
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#define _TIF_DO_NOTIFY_RESUME_MASK (_TIF_NOTIFY_RESUME | _TIF_SIGPENDING)
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/*
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* Thread-synchronous status.
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*
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* This is different from the flags in that nobody else
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* ever touches our thread-synchronous status, so we don't
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* have to worry about atomic accesses.
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*
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* Note that there are only 8 bits available.
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*/
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#define TS_RESTORE_SIGMASK 0x0001 /* restore signal mask in do_signal() */
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#ifndef __ASSEMBLY__
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#define HAVE_SET_RESTORE_SIGMASK 1
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static inline void set_restore_sigmask(void)
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{
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struct thread_info *ti = current_thread_info();
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ti->status |= TS_RESTORE_SIGMASK;
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set_bit(TIF_SIGPENDING, &ti->flags);
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}
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#endif /* !__ASSEMBLY__ */
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#endif /* __KERNEL__ */
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#endif /* _ASM_THREAD_INFO_H */
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