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Task Control Groups: make cpusets a client of cgroups
Remove the filesystem support logic from the cpusets system and makes cpusets a cgroup subsystem The "cpuset" filesystem becomes a dummy filesystem; attempts to mount it get passed through to the cgroup filesystem with the appropriate options to emulate the old cpuset filesystem behaviour. Signed-off-by: Paul Menage <menage@google.com> Cc: Serge E. Hallyn <serue@us.ibm.com> Cc: "Eric W. Biederman" <ebiederm@xmission.com> Cc: Dave Hansen <haveblue@us.ibm.com> Cc: Balbir Singh <balbir@in.ibm.com> Cc: Paul Jackson <pj@sgi.com> Cc: Kirill Korotaev <dev@openvz.org> Cc: Herbert Poetzl <herbert@13thfloor.at> Cc: Srivatsa Vaddagiri <vatsa@in.ibm.com> Cc: Cedric Le Goater <clg@fr.ibm.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Paul Menage
Linus Torvalds
parent
81a6a5cdd2
commit
8793d854ed
@ -7,6 +7,7 @@ Written by Simon.Derr@bull.net
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Portions Copyright (c) 2004-2006 Silicon Graphics, Inc.
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Modified by Paul Jackson <pj@sgi.com>
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Modified by Christoph Lameter <clameter@sgi.com>
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Modified by Paul Menage <menage@google.com>
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CONTENTS:
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=========
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@ -16,10 +17,9 @@ CONTENTS:
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1.2 Why are cpusets needed ?
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1.3 How are cpusets implemented ?
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1.4 What are exclusive cpusets ?
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1.5 What does notify_on_release do ?
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1.6 What is memory_pressure ?
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1.7 What is memory spread ?
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1.8 How do I use cpusets ?
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1.5 What is memory_pressure ?
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1.6 What is memory spread ?
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1.7 How do I use cpusets ?
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2. Usage Examples and Syntax
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2.1 Basic Usage
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2.2 Adding/removing cpus
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@ -44,18 +44,19 @@ hierarchy visible in a virtual file system. These are the essential
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hooks, beyond what is already present, required to manage dynamic
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job placement on large systems.
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Each task has a pointer to a cpuset. Multiple tasks may reference
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the same cpuset. Requests by a task, using the sched_setaffinity(2)
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system call to include CPUs in its CPU affinity mask, and using the
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mbind(2) and set_mempolicy(2) system calls to include Memory Nodes
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in its memory policy, are both filtered through that tasks cpuset,
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filtering out any CPUs or Memory Nodes not in that cpuset. The
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scheduler will not schedule a task on a CPU that is not allowed in
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its cpus_allowed vector, and the kernel page allocator will not
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allocate a page on a node that is not allowed in the requesting tasks
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mems_allowed vector.
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Cpusets use the generic cgroup subsystem described in
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Documentation/cgroup.txt.
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User level code may create and destroy cpusets by name in the cpuset
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Requests by a task, using the sched_setaffinity(2) system call to
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include CPUs in its CPU affinity mask, and using the mbind(2) and
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set_mempolicy(2) system calls to include Memory Nodes in its memory
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policy, are both filtered through that tasks cpuset, filtering out any
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CPUs or Memory Nodes not in that cpuset. The scheduler will not
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schedule a task on a CPU that is not allowed in its cpus_allowed
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vector, and the kernel page allocator will not allocate a page on a
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node that is not allowed in the requesting tasks mems_allowed vector.
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User level code may create and destroy cpusets by name in the cgroup
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virtual file system, manage the attributes and permissions of these
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cpusets and which CPUs and Memory Nodes are assigned to each cpuset,
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specify and query to which cpuset a task is assigned, and list the
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@ -115,7 +116,7 @@ Cpusets extends these two mechanisms as follows:
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- Cpusets are sets of allowed CPUs and Memory Nodes, known to the
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kernel.
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- Each task in the system is attached to a cpuset, via a pointer
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in the task structure to a reference counted cpuset structure.
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in the task structure to a reference counted cgroup structure.
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- Calls to sched_setaffinity are filtered to just those CPUs
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allowed in that tasks cpuset.
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- Calls to mbind and set_mempolicy are filtered to just
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@ -145,15 +146,10 @@ into the rest of the kernel, none in performance critical paths:
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- in page_alloc.c, to restrict memory to allowed nodes.
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- in vmscan.c, to restrict page recovery to the current cpuset.
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In addition a new file system, of type "cpuset" may be mounted,
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typically at /dev/cpuset, to enable browsing and modifying the cpusets
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presently known to the kernel. No new system calls are added for
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cpusets - all support for querying and modifying cpusets is via
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this cpuset file system.
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Each task under /proc has an added file named 'cpuset', displaying
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the cpuset name, as the path relative to the root of the cpuset file
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system.
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You should mount the "cgroup" filesystem type in order to enable
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browsing and modifying the cpusets presently known to the kernel. No
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new system calls are added for cpusets - all support for querying and
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modifying cpusets is via this cpuset file system.
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The /proc/<pid>/status file for each task has two added lines,
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displaying the tasks cpus_allowed (on which CPUs it may be scheduled)
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@ -163,16 +159,15 @@ in the format seen in the following example:
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Cpus_allowed: ffffffff,ffffffff,ffffffff,ffffffff
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Mems_allowed: ffffffff,ffffffff
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Each cpuset is represented by a directory in the cpuset file system
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containing the following files describing that cpuset:
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Each cpuset is represented by a directory in the cgroup file system
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containing (on top of the standard cgroup files) the following
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files describing that cpuset:
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- cpus: list of CPUs in that cpuset
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- mems: list of Memory Nodes in that cpuset
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- memory_migrate flag: if set, move pages to cpusets nodes
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- cpu_exclusive flag: is cpu placement exclusive?
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- mem_exclusive flag: is memory placement exclusive?
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- tasks: list of tasks (by pid) attached to that cpuset
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- notify_on_release flag: run /sbin/cpuset_release_agent on exit?
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- memory_pressure: measure of how much paging pressure in cpuset
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In addition, the root cpuset only has the following file:
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@ -237,21 +232,7 @@ such as requests from interrupt handlers, is allowed to be taken
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outside even a mem_exclusive cpuset.
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1.5 What does notify_on_release do ?
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------------------------------------
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If the notify_on_release flag is enabled (1) in a cpuset, then whenever
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the last task in the cpuset leaves (exits or attaches to some other
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cpuset) and the last child cpuset of that cpuset is removed, then
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the kernel runs the command /sbin/cpuset_release_agent, supplying the
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pathname (relative to the mount point of the cpuset file system) of the
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abandoned cpuset. This enables automatic removal of abandoned cpusets.
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The default value of notify_on_release in the root cpuset at system
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boot is disabled (0). The default value of other cpusets at creation
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is the current value of their parents notify_on_release setting.
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1.6 What is memory_pressure ?
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1.5 What is memory_pressure ?
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-----------------------------
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The memory_pressure of a cpuset provides a simple per-cpuset metric
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of the rate that the tasks in a cpuset are attempting to free up in
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@ -308,7 +289,7 @@ the tasks in the cpuset, in units of reclaims attempted per second,
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times 1000.
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1.7 What is memory spread ?
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1.6 What is memory spread ?
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---------------------------
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There are two boolean flag files per cpuset that control where the
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kernel allocates pages for the file system buffers and related in
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@ -379,7 +360,7 @@ data set, the memory allocation across the nodes in the jobs cpuset
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can become very uneven.
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1.8 How do I use cpusets ?
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1.7 How do I use cpusets ?
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--------------------------
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In order to minimize the impact of cpusets on critical kernel
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@ -469,7 +450,7 @@ than stress the kernel.
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To start a new job that is to be contained within a cpuset, the steps are:
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1) mkdir /dev/cpuset
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2) mount -t cpuset none /dev/cpuset
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2) mount -t cgroup -ocpuset cpuset /dev/cpuset
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3) Create the new cpuset by doing mkdir's and write's (or echo's) in
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the /dev/cpuset virtual file system.
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4) Start a task that will be the "founding father" of the new job.
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@ -481,7 +462,7 @@ For example, the following sequence of commands will setup a cpuset
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named "Charlie", containing just CPUs 2 and 3, and Memory Node 1,
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and then start a subshell 'sh' in that cpuset:
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mount -t cpuset none /dev/cpuset
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mount -t cgroup -ocpuset cpuset /dev/cpuset
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cd /dev/cpuset
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mkdir Charlie
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cd Charlie
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@ -513,7 +494,7 @@ Creating, modifying, using the cpusets can be done through the cpuset
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virtual filesystem.
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To mount it, type:
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# mount -t cpuset none /dev/cpuset
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# mount -t cgroup -o cpuset cpuset /dev/cpuset
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Then under /dev/cpuset you can find a tree that corresponds to the
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tree of the cpusets in the system. For instance, /dev/cpuset
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@ -556,6 +537,18 @@ To remove a cpuset, just use rmdir:
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This will fail if the cpuset is in use (has cpusets inside, or has
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processes attached).
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Note that for legacy reasons, the "cpuset" filesystem exists as a
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wrapper around the cgroup filesystem.
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The command
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mount -t cpuset X /dev/cpuset
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is equivalent to
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mount -t cgroup -ocpuset X /dev/cpuset
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echo "/sbin/cpuset_release_agent" > /dev/cpuset/release_agent
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2.2 Adding/removing cpus
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------------------------
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@ -2131,7 +2131,7 @@ static const struct pid_entry tgid_base_stuff[] = {
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#ifdef CONFIG_SCHEDSTATS
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INF("schedstat", S_IRUGO, pid_schedstat),
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#endif
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#ifdef CONFIG_CPUSETS
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#ifdef CONFIG_PROC_PID_CPUSET
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REG("cpuset", S_IRUGO, cpuset),
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#endif
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#ifdef CONFIG_CGROUPS
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@ -2420,7 +2420,7 @@ static const struct pid_entry tid_base_stuff[] = {
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#ifdef CONFIG_SCHEDSTATS
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INF("schedstat", S_IRUGO, pid_schedstat),
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#endif
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#ifdef CONFIG_CPUSETS
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#ifdef CONFIG_PROC_PID_CPUSET
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REG("cpuset", S_IRUGO, cpuset),
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#endif
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#ifdef CONFIG_CGROUPS
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@ -7,4 +7,10 @@
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/* */
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#ifdef CONFIG_CPUSETS
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SUBSYS(cpuset)
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#endif
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/* */
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/* */
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@ -11,6 +11,7 @@
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#include <linux/sched.h>
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#include <linux/cpumask.h>
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#include <linux/nodemask.h>
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#include <linux/cgroup.h>
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#ifdef CONFIG_CPUSETS
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@ -19,8 +20,6 @@ extern int number_of_cpusets; /* How many cpusets are defined in system? */
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extern int cpuset_init_early(void);
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extern int cpuset_init(void);
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extern void cpuset_init_smp(void);
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extern void cpuset_fork(struct task_struct *p);
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extern void cpuset_exit(struct task_struct *p);
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extern cpumask_t cpuset_cpus_allowed(struct task_struct *p);
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extern nodemask_t cpuset_mems_allowed(struct task_struct *p);
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#define cpuset_current_mems_allowed (current->mems_allowed)
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@ -76,13 +75,13 @@ static inline int cpuset_do_slab_mem_spread(void)
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extern void cpuset_track_online_nodes(void);
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extern int current_cpuset_is_being_rebound(void);
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#else /* !CONFIG_CPUSETS */
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static inline int cpuset_init_early(void) { return 0; }
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static inline int cpuset_init(void) { return 0; }
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static inline void cpuset_init_smp(void) {}
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static inline void cpuset_fork(struct task_struct *p) {}
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static inline void cpuset_exit(struct task_struct *p) {}
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static inline cpumask_t cpuset_cpus_allowed(struct task_struct *p)
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{
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@ -148,6 +147,11 @@ static inline int cpuset_do_slab_mem_spread(void)
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static inline void cpuset_track_online_nodes(void) {}
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static inline int current_cpuset_is_being_rebound(void)
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{
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return 0;
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}
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#endif /* !CONFIG_CPUSETS */
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#endif /* _LINUX_CPUSET_H */
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@ -148,14 +148,6 @@ extern void mpol_rebind_task(struct task_struct *tsk,
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const nodemask_t *new);
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extern void mpol_rebind_mm(struct mm_struct *mm, nodemask_t *new);
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extern void mpol_fix_fork_child_flag(struct task_struct *p);
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#define set_cpuset_being_rebound(x) (cpuset_being_rebound = (x))
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#ifdef CONFIG_CPUSETS
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#define current_cpuset_is_being_rebound() \
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(cpuset_being_rebound == current->cpuset)
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#else
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#define current_cpuset_is_being_rebound() 0
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#endif
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extern struct mempolicy default_policy;
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extern struct zonelist *huge_zonelist(struct vm_area_struct *vma,
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@ -173,8 +165,6 @@ static inline void check_highest_zone(enum zone_type k)
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int do_migrate_pages(struct mm_struct *mm,
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const nodemask_t *from_nodes, const nodemask_t *to_nodes, int flags);
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extern void *cpuset_being_rebound; /* Trigger mpol_copy vma rebind */
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#else
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struct mempolicy {};
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@ -248,8 +238,6 @@ static inline void mpol_fix_fork_child_flag(struct task_struct *p)
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{
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}
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#define set_cpuset_being_rebound(x) do {} while (0)
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static inline struct zonelist *huge_zonelist(struct vm_area_struct *vma,
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unsigned long addr, gfp_t gfp_flags, struct mempolicy **mpol)
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{
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@ -756,8 +756,6 @@ static inline int above_background_load(void)
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}
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struct io_context; /* See blkdev.h */
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struct cpuset;
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#define NGROUPS_SMALL 32
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#define NGROUPS_PER_BLOCK ((int)(PAGE_SIZE / sizeof(gid_t)))
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struct group_info {
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@ -1125,7 +1123,6 @@ struct task_struct {
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short il_next;
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#endif
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#ifdef CONFIG_CPUSETS
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struct cpuset *cpuset;
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nodemask_t mems_allowed;
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int cpuset_mems_generation;
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int cpuset_mem_spread_rotor;
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@ -280,7 +280,7 @@ config CGROUPS
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config CPUSETS
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bool "Cpuset support"
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depends on SMP
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depends on SMP && CGROUPS
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help
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This option will let you create and manage CPUSETs which
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allow dynamically partitioning a system into sets of CPUs and
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@ -330,6 +330,11 @@ config SYSFS_DEPRECATED
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If you are using a distro that was released in 2006 or later,
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it should be safe to say N here.
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config PROC_PID_CPUSET
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bool "Include legacy /proc/<pid>/cpuset file"
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depends on CPUSETS
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default y
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config RELAY
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bool "Kernel->user space relay support (formerly relayfs)"
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help
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1188
kernel/cpuset.c
1188
kernel/cpuset.c
File diff suppressed because it is too large
Load Diff
@ -31,7 +31,6 @@
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#include <linux/taskstats_kern.h>
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#include <linux/delayacct.h>
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#include <linux/freezer.h>
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#include <linux/cpuset.h>
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#include <linux/cgroup.h>
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#include <linux/syscalls.h>
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#include <linux/signal.h>
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@ -973,7 +972,6 @@ fastcall NORET_TYPE void do_exit(long code)
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__exit_fs(tsk);
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check_stack_usage();
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exit_thread();
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cpuset_exit(tsk);
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cgroup_exit(tsk, 1);
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exit_keys(tsk);
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@ -29,7 +29,6 @@
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#include <linux/nsproxy.h>
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#include <linux/capability.h>
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#include <linux/cpu.h>
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#include <linux/cpuset.h>
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#include <linux/cgroup.h>
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#include <linux/security.h>
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#include <linux/swap.h>
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@ -1089,7 +1088,6 @@ static struct task_struct *copy_process(unsigned long clone_flags,
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#endif
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p->io_context = NULL;
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p->audit_context = NULL;
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cpuset_fork(p);
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cgroup_fork(p);
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#ifdef CONFIG_NUMA
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p->mempolicy = mpol_copy(p->mempolicy);
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@ -1330,7 +1328,6 @@ bad_fork_cleanup_policy:
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mpol_free(p->mempolicy);
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bad_fork_cleanup_cgroup:
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#endif
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cpuset_exit(p);
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cgroup_exit(p, cgroup_callbacks_done);
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bad_fork_cleanup_delays_binfmt:
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delayacct_tsk_free(p);
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@ -1388,7 +1388,6 @@ EXPORT_SYMBOL(alloc_pages_current);
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* keeps mempolicies cpuset relative after its cpuset moves. See
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* further kernel/cpuset.c update_nodemask().
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*/
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void *cpuset_being_rebound;
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/* Slow path of a mempolicy copy */
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struct mempolicy *__mpol_copy(struct mempolicy *old)
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@ -2019,4 +2018,3 @@ out:
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m->version = (vma != priv->tail_vma) ? vma->vm_start : 0;
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return 0;
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}
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