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| author | Balbir Singh <balbir@linux.vnet.ibm.com> | 2008-04-29 01:00:16 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2008-04-29 08:06:10 -0700 |
| commit | cf475ad28ac35cc9ba612d67158f29b73b38b05d (patch) | |
| tree | 2c7cd568d00357bd42643ea602884e731cc24f26 /init | |
| parent | 29486df325e1fe6e1764afcb19e3370804c2b002 (diff) | |
| download | lwn-cf475ad28ac35cc9ba612d67158f29b73b38b05d.tar.gz lwn-cf475ad28ac35cc9ba612d67158f29b73b38b05d.zip | |
cgroups: add an owner to the mm_struct
Remove the mem_cgroup member from mm_struct and instead adds an owner.
This approach was suggested by Paul Menage. The advantage of this approach
is that, once the mm->owner is known, using the subsystem id, the cgroup
can be determined. It also allows several control groups that are
virtually grouped by mm_struct, to exist independent of the memory
controller i.e., without adding mem_cgroup's for each controller, to
mm_struct.
A new config option CONFIG_MM_OWNER is added and the memory resource
controller selects this config option.
This patch also adds cgroup callbacks to notify subsystems when mm->owner
changes. The mm_cgroup_changed callback is called with the task_lock() of
the new task held and is called just prior to changing the mm->owner.
I am indebted to Paul Menage for the several reviews of this patchset and
helping me make it lighter and simpler.
This patch was tested on a powerpc box, it was compiled with both the
MM_OWNER config turned on and off.
After the thread group leader exits, it's moved to init_css_state by
cgroup_exit(), thus all future charges from runnings threads would be
redirected to the init_css_set's subsystem.
Signed-off-by: Balbir Singh <balbir@linux.vnet.ibm.com>
Cc: Pavel Emelianov <xemul@openvz.org>
Cc: Hugh Dickins <hugh@veritas.com>
Cc: Sudhir Kumar <skumar@linux.vnet.ibm.com>
Cc: YAMAMOTO Takashi <yamamoto@valinux.co.jp>
Cc: Hirokazu Takahashi <taka@valinux.co.jp>
Cc: David Rientjes <rientjes@google.com>,
Cc: Balbir Singh <balbir@linux.vnet.ibm.com>
Acked-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Acked-by: Pekka Enberg <penberg@cs.helsinki.fi>
Reviewed-by: Paul Menage <menage@google.com>
Cc: Oleg Nesterov <oleg@tv-sign.ru>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'init')
| -rw-r--r-- | init/Kconfig | 7 | ||||
| -rw-r--r-- | init/main.c | 1 |
2 files changed, 8 insertions, 0 deletions
diff --git a/init/Kconfig b/init/Kconfig index a3457926342a..98fa96eac415 100644 --- a/init/Kconfig +++ b/init/Kconfig @@ -378,9 +378,13 @@ config RESOURCE_COUNTERS infrastructure that works with cgroups depends on CGROUPS +config MM_OWNER + bool + config CGROUP_MEM_RES_CTLR bool "Memory Resource Controller for Control Groups" depends on CGROUPS && RESOURCE_COUNTERS + select MM_OWNER help Provides a memory resource controller that manages both page cache and RSS memory. @@ -393,6 +397,9 @@ config CGROUP_MEM_RES_CTLR Only enable when you're ok with these trade offs and really sure you need the memory resource controller. + This config option also selects MM_OWNER config option, which + could in turn add some fork/exit overhead. + config SYSFS_DEPRECATED bool diff --git a/init/main.c b/init/main.c index 1116d2f40cc1..c62c98f381f2 100644 --- a/init/main.c +++ b/init/main.c @@ -559,6 +559,7 @@ asmlinkage void __init start_kernel(void) printk(KERN_NOTICE); printk(linux_banner); setup_arch(&command_line); + mm_init_owner(&init_mm, &init_task); setup_command_line(command_line); unwind_setup(); setup_per_cpu_areas(); |