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Re: [ckrm-tech] [PATCH 1/7] containers (V7): Generic container system abstracted from cpusets code [message #11010 is a reply to message #10941]

Sun, 11 March 2007 19:38

Paul Jackson
Messages: 157
Registered: February 2006

Senior Member

vatsa wrote:
> Yes, that way only the hierarchy hosting cpusets takes the hit of
> double-locking. cpuset_subsys->create/destroy can take this additional lock
> inside cpuset.c.

The primary reason for the cpuset double locking, as I recall, was because
cpusets needs to access cpusets inside the memory allocator. A single,
straight forward, cpuset lock failed under the following common scenario:
1) user does cpuset system call (writes some file below /dev/cpuset, e.g.)
2) kernel cpuset code locks its lock
3) cpuset code asks to allocate some memory for some cpuset structure
4) memory allocator tries to lock the cpuset lock - deadlock!

The reason that the memory allocator needs the cpuset lock is to check
whether the memory nodes the current task is allowed to use have changed,
due to changes in the current tasks cpuset.

A secondary reason that the cpuset code needs two locks is because the
main cpuset lock is a long held, system wide lock, and various low
level bits of performance critical code sometimes require quick,
read-only access to cpusets.

--
I won't rest till it's the best ...
Programmer, Linux Scalability
Paul Jackson <pj@sgi.com> 1.925.600.0401

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[Message index]

		[PATCH 0/7] containers (V7): Generic Process Containers By: Paul Menage on Mon, 12 February 2007 08:15
		[PATCH 2/7] containers (V7): Cpusets hooked into containers By: Paul Menage on Mon, 12 February 2007 08:15
		Re: [PATCH 2/7] containers (V7): Cpusets hooked into containers By: Paul Menage on Thu, 15 February 2007 20:49
		Re: [PATCH 2/7] containers (V7): Cpusets hooked into containers By: serue on Thu, 15 February 2007 20:35
		Re: [PATCH 2/7] containers (V7): Cpusets hooked into containers By: Srivatsa Vaddagiri on Wed, 07 March 2007 14:34
		Re: [PATCH 2/7] containers (V7): Cpusets hooked into containers By: Paul Menage on Wed, 07 March 2007 16:01
		Re: [ckrm-tech] [PATCH 2/7] containers (V7): Cpusets hooked into containers By: Srivatsa Vaddagiri on Wed, 07 March 2007 16:24
		Re: [ckrm-tech] [PATCH 2/7] containers (V7): Cpusets hooked into containers By: Paul Menage on Wed, 07 March 2007 16:31
		Re: [PATCH 2/7] containers (V7): Cpusets hooked into containers By: Srivatsa Vaddagiri on Wed, 07 March 2007 14:52
		Re: [PATCH 2/7] containers (V7): Cpusets hooked into containers By: Paul Menage on Wed, 07 March 2007 16:12
		[PATCH 4/7] containers (V7): Simple CPU accounting container subsystem By: Paul Menage on Mon, 12 February 2007 08:15
		[PATCH 7/7] containers (V7): Container interface to nsproxy subsystem By: Paul Menage on Mon, 12 February 2007 08:15
		Re: [ckrm-tech] [PATCH 7/7] containers (V7): Container interface to nsproxy subsystem By: Srivatsa Vaddagiri on Sat, 24 March 2007 04:58
		Re: [ckrm-tech] [PATCH 7/7] containers (V7): Container interface to nsproxy subsystem By: serue on Mon, 26 March 2007 21:55
		Re: [ckrm-tech] [PATCH 7/7] containers (V7): Container interface to nsproxy subsystem By: Srivatsa Vaddagiri on Sat, 24 March 2007 16:23
		Re: [ckrm-tech] [PATCH 7/7] containers (V7): Container interface to nsproxy subsystem By: serue on Mon, 26 March 2007 21:57
		Re: [ckrm-tech] [PATCH 7/7] containers (V7): Container interface to nsproxy subsystem By: Srivatsa Vaddagiri on Wed, 28 March 2007 14:55
		Re: [ckrm-tech] [PATCH 7/7] containers (V7): Container interface to nsproxy subsystem By: Srivatsa Vaddagiri on Sat, 31 March 2007 02:47
		Re: [ckrm-tech] [PATCH 7/7] containers (V7): Container interface to nsproxy subsystem By: serue on Mon, 02 April 2007 14:09
		[PATCH 6/7] containers (V7): BeanCounters over generic process containers By: Paul Menage on Mon, 12 February 2007 08:15
		Re: [PATCH 6/7] containers (V7): BeanCounters over generic process containers By: Srivatsa Vaddagiri on Mon, 12 February 2007 15:34
		Re: [PATCH 6/7] containers (V7): BeanCounters over generic process containers By: Paul Menage on Mon, 12 February 2007 18:49
		Re: [PATCH 6/7] containers (V7): BeanCounters over generic process containers By: xemul on Tue, 13 February 2007 08:52
		Re: [PATCH 6/7] containers (V7): BeanCounters over generic process containers By: Paul Menage on Tue, 13 February 2007 09:03
		Re: [PATCH 6/7] containers (V7): BeanCounters over generic process containers By: xemul on Tue, 13 February 2007 09:18
		Re: [PATCH 6/7] containers (V7): BeanCounters over generic process containers By: Paul Menage on Tue, 13 February 2007 09:37
		Re: [PATCH 6/7] containers (V7): BeanCounters over generic process containers By: xemul on Tue, 13 February 2007 09:49
		Re: [PATCH 6/7] containers (V7): BeanCounters over generic process containers By: Paul Menage on Thu, 15 February 2007 00:47
		[PATCH 5/7] containers (V7): Resource Groups over generic containers By: Paul Menage on Mon, 12 February 2007 08:15
		[PATCH 1/7] containers (V7): Generic container system abstracted from cpusets code By: Paul Menage on Mon, 12 February 2007 08:15
		Re: [PATCH 1/7] containers (V7): Generic container system abstracted from cpusets code By: Paul Menage on Mon, 12 February 2007 19:26
		Re: [PATCH 1/7] containers (V7): Generic container system abstracted from cpusets code By: Paul Menage on Mon, 12 February 2007 19:46
		Re: [PATCH 1/7] containers (V7): Generic container system abstracted from cpusets code By: Srivatsa Vaddagiri on Tue, 13 February 2007 05:48
		Re: [ckrm-tech] [PATCH 1/7] containers (V7): Generic container system abstracted from cpusets code By: Srivatsa Vaddagiri on Tue, 13 February 2007 08:16
		Re: [PATCH 1/7] containers (V7): Generic container system abstracted from cpusets code By: Srivatsa Vaddagiri on Wed, 07 March 2007 12:21
		Re: [ckrm-tech] [PATCH 1/7] containers (V7): Generic container system abstracted from cpusets code By: Srivatsa Vaddagiri on Wed, 07 March 2007 14:06
		Re: [PATCH 1/7] containers (V7): Generic container system abstracted from cpusets code By: Paul Menage on Wed, 07 March 2007 20:50
		Re: [ckrm-tech] [PATCH 1/7] containers (V7): Generic container system abstracted from cpusets code By: Srivatsa Vaddagiri on Thu, 08 March 2007 10:31
		Re: [ckrm-tech] [PATCH 1/7] containers (V7): Generic container system abstracted from cpusets code By: Paul Menage on Thu, 08 March 2007 10:40
		Re: [ckrm-tech] [PATCH 1/7] containers (V7): Generic container system abstracted from cpusets code By: Paul Jackson on Sun, 11 March 2007 19:38
		Re: [ckrm-tech] [PATCH 1/7] containers (V7): Generic container system abstracted from cpusets code By: Srivatsa Vaddagiri on Mon, 12 March 2007 14:19
		Re: [ckrm-tech] [PATCH 1/7] containers (V7): Generic container system abstracted from cpusets code By: Srivatsa Vaddagiri on Thu, 22 March 2007 09:56
		Re: [ckrm-tech] [PATCH 1/7] containers (V7): Generic container system abstracted from cpusets code By: Srivatsa Vaddagiri on Thu, 22 March 2007 10:20
		Re: [ckrm-tech] [PATCH 1/7] containers (V7): Generic container system abstracted from cpusets code By: Srivatsa Vaddagiri on Sat, 24 March 2007 14:58
		Re: [ckrm-tech] [PATCH 1/7] containers (V7): Generic container system abstracted from cpusets code By: Paul Jackson on Sat, 24 March 2007 19:25
		Re: [ckrm-tech] [PATCH 1/7] containers (V7): Generic container system abstracted from cpusets code By: Srivatsa Vaddagiri on Sun, 25 March 2007 00:38
		Re: [ckrm-tech] [PATCH 1/7] containers (V7): Generic container system abstracted from cpusets code By: Paul Jackson on Sun, 25 March 2007 01:41
		Re: [ckrm-tech] [PATCH 1/7] containers (V7): Generic container system abstracted from cpusets code By: Srivatsa Vaddagiri on Sun, 25 March 2007 02:21
		Re: [ckrm-tech] [PATCH 1/7] containers (V7): Generic container system abstracted from cpusets code By: Srivatsa Vaddagiri on Sun, 25 March 2007 04:16
		Re: [ckrm-tech] [PATCH 1/7] containers (V7): Generic container system abstracted from cpusets code By: Paul Jackson on Sun, 25 March 2007 05:43
		Re: [ckrm-tech] [PATCH 1/7] containers (V7): Generic container system abstracted from cpusets code By: Srivatsa Vaddagiri on Sun, 25 March 2007 08:14
		Re: [ckrm-tech] [PATCH 1/7] containers (V7): Generic container system abstracted from cpusets code By: Paul Jackson on Sun, 25 March 2007 04:45
		Re: [ckrm-tech] [PATCH 1/7] containers (V7): Generic container system abstracted from cpusets code By: Srivatsa Vaddagiri on Sun, 25 March 2007 04:57
		Re: [ckrm-tech] [PATCH 1/7] containers (V7): Generic container system abstracted from cpusets code By: Paul Jackson on Sun, 25 March 2007 04:59
		Re: [PATCH 0/7] containers (V7): Generic Process Containers By: Paul Jackson on Mon, 12 February 2007 09:18
		Re: [PATCH 0/7] containers (V7): Generic Process Containers By: Paul Menage on Mon, 12 February 2007 09:32
		Re: [PATCH 0/7] containers (V7): Generic Process Containers By: Paul Jackson on Mon, 12 February 2007 09:52
		[PATCH 3/7] containers (V7): Add generic multi-subsystem API to containers By: Paul Menage on Mon, 12 February 2007 08:15
		Re: [PATCH 3/7] containers (V7): Add generic multi-subsystem API to containers By: Paul Menage on Mon, 12 February 2007 18:31
		Re: [PATCH 3/7] containers (V7): Add generic multi-subsystem API to containers By: Cedric Le Goater on Mon, 12 February 2007 15:56
		Re: [PATCH 3/7] containers (V7): Add generic multi-subsystem API to containers By: Balbir Singh on Wed, 14 February 2007 08:49
		Re: [PATCH 0/7] containers (V7): Generic Process Containers By: Paul Menage on Mon, 12 February 2007 23:15
		Re: [PATCH 0/7] containers (V7): Generic Process Containers By: Sam Vilain on Tue, 13 February 2007 00:30
		Re: [PATCH 0/7] containers (V7): Generic Process Containers By: ebiederm on Tue, 20 February 2007 17:34
		Re: [PATCH 0/7] containers (V7): Generic Process Containers By: Paul Menage on Mon, 12 February 2007 23:18
		Re: [PATCH 0/7] containers (V7): Generic Process Containers By: serue on Mon, 12 February 2007 22:47
		Re: [PATCH 0/7] containers (V7): Generic Process Containers By: Sam Vilain on Mon, 12 February 2007 22:38
		Re: [PATCH 0/7] containers (V7): Generic Process Containers By: Paul Menage on Tue, 20 February 2007 17:55
		Re: [PATCH 0/7] containers (V7): Generic Process Containers By: ebiederm on Tue, 20 February 2007 19:29
		Re: [PATCH 0/7] containers (V7): Generic Process Containers By: Paul Menage on Tue, 20 February 2007 22:47
		Re: [PATCH 0/7] containers (V7): Generic Process Containers By: serue on Tue, 20 February 2007 23:32
		Re: [PATCH 0/7] containers (V7): Generic Process Containers By: Sam Vilain on Tue, 20 February 2007 23:08
		Re: [PATCH 0/7] containers (V7): Generic Process Containers By: Sam Vilain on Tue, 20 February 2007 21:58
		Re: [PATCH 0/7] containers (V7): Generic Process Containers By: Paul Menage on Tue, 20 February 2007 22:19
		Re: [PATCH 0/7] containers (V7): Generic Process Containers By: Sam Vilain on Tue, 20 February 2007 22:58
		Re: [PATCH 0/7] containers (V7): Generic Process Containers By: Paul Menage on Tue, 20 February 2007 23:28
		Re: [PATCH 0/7] containers (V7): Generic Process Containers By: Paul Menage on Tue, 20 February 2007 23:36
		Re: [PATCH 0/7] containers (V7): Generic Process Containers By: serue on Tue, 20 February 2007 23:37

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