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Commit 83224b08 authored by Matt Helsley's avatar Matt Helsley Committed by Linus Torvalds
Browse files

container freezer: add TIF_FREEZE flag to all architectures 



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: default avatarCedric Le Goater <clg@fr.ibm.com>
Signed-off-by: default avatarMatt Helsley <matthltc@us.ibm.com>
Acked-by: default avatarPavel Machek <pavel@suse.cz>
Acked-by: default avatarSerge E. Hallyn <serue@us.ibm.com>
Acked-by: default avatarRafael J. Wysocki <rjw@sisk.pl>
Acked-by: default avatarNigel Cunningham <nigel@tuxonice.net>
Tested-by: default avatarMatt Helsley <matthltc@us.ibm.com>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent 5e9a0f02

arch/alpha/include/asm/thread_info.h

+2 −0
Original line number Diff line number Diff line
@@ -74,12 +74,14 @@ register struct thread_info *__current_thread_info __asm__("$8"); 
#define TIF_UAC_SIGBUS		7

#define TIF_MEMDIE		8

#define TIF_RESTORE_SIGMASK	9	/* restore signal mask in do_signal */

#define TIF_FREEZE		16	/* is freezing for suspend */



#define _TIF_SYSCALL_TRACE	(1<<TIF_SYSCALL_TRACE)

#define _TIF_SIGPENDING		(1<<TIF_SIGPENDING)

#define _TIF_NEED_RESCHED	(1<<TIF_NEED_RESCHED)

#define _TIF_POLLING_NRFLAG	(1<<TIF_POLLING_NRFLAG)

#define _TIF_RESTORE_SIGMASK	(1<<TIF_RESTORE_SIGMASK)

#define _TIF_FREEZE		(1<<TIF_FREEZE)



/* Work to do on interrupt/exception return.  */

#define _TIF_WORK_MASK		(_TIF_SIGPENDING | _TIF_NEED_RESCHED)

arch/avr32/include/asm/thread_info.h

+1 −0
Original line number Diff line number Diff line
@@ -96,6 +96,7 @@ static inline struct thread_info *current_thread_info(void) 
#define _TIF_MEMDIE		(1 << TIF_MEMDIE)

#define _TIF_RESTORE_SIGMASK	(1 << TIF_RESTORE_SIGMASK)

#define _TIF_CPU_GOING_TO_SLEEP (1 << TIF_CPU_GOING_TO_SLEEP)

#define _TIF_FREEZE		(1 << TIF_FREEZE)



/* Note: The masks below must never span more than 16 bits! */

arch/h8300/include/asm/thread_info.h

+2 −0
Original line number Diff line number Diff line
@@ -89,6 +89,7 @@ static inline struct thread_info *current_thread_info(void) 
					   TIF_NEED_RESCHED */

#define TIF_MEMDIE		4

#define TIF_RESTORE_SIGMASK	5	/* restore signal mask in do_signal() */

#define TIF_FREEZE		16	/* is freezing for suspend */



/* as above, but as bit values */

#define _TIF_SYSCALL_TRACE	(1<<TIF_SYSCALL_TRACE)
@@ -96,6 +97,7 @@ static inline struct thread_info *current_thread_info(void) 
#define _TIF_NEED_RESCHED	(1<<TIF_NEED_RESCHED)

#define _TIF_POLLING_NRFLAG	(1<<TIF_POLLING_NRFLAG)

#define _TIF_RESTORE_SIGMASK	(1<<TIF_RESTORE_SIGMASK)

#define _TIF_FREEZE		(1<<TIF_FREEZE)



#define _TIF_WORK_MASK		0x0000FFFE	/* work to do on interrupt/exception return */

arch/m68knommu/include/asm/thread_info.h

+2 −0
Original line number Diff line number Diff line
@@ -84,12 +84,14 @@ static inline struct thread_info *current_thread_info(void) 
#define TIF_POLLING_NRFLAG	3	/* true if poll_idle() is polling

					   TIF_NEED_RESCHED */

#define TIF_MEMDIE		4

#define TIF_FREEZE		16	/* is freezing for suspend */



/* as above, but as bit values */

#define _TIF_SYSCALL_TRACE	(1<<TIF_SYSCALL_TRACE)

#define _TIF_SIGPENDING		(1<<TIF_SIGPENDING)

#define _TIF_NEED_RESCHED	(1<<TIF_NEED_RESCHED)

#define _TIF_POLLING_NRFLAG	(1<<TIF_POLLING_NRFLAG)

#define _TIF_FREEZE		(1<<TIF_FREEZE)



#define _TIF_WORK_MASK		0x0000FFFE	/* work to do on interrupt/exception return */

arch/s390/include/asm/thread_info.h

+2 −0
Original line number Diff line number Diff line
@@ -99,6 +99,7 @@ static inline struct thread_info *current_thread_info(void) 
#define TIF_31BIT		18	/* 32bit process */ 

#define TIF_MEMDIE		19

#define TIF_RESTORE_SIGMASK	20	/* restore signal mask in do_signal() */

#define TIF_FREEZE		21	/* thread is freezing for suspend */



#define _TIF_SYSCALL_TRACE	(1<<TIF_SYSCALL_TRACE)

#define _TIF_NOTIFY_RESUME	(1<<TIF_NOTIFY_RESUME)
@@ -112,6 +113,7 @@ static inline struct thread_info *current_thread_info(void) 
#define _TIF_USEDFPU		(1<<TIF_USEDFPU)

#define _TIF_POLLING_NRFLAG	(1<<TIF_POLLING_NRFLAG)

#define _TIF_31BIT		(1<<TIF_31BIT)

#define _TIF_FREEZE		(1<<TIF_FREEZE)



#endif /* __KERNEL__ */