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authorBalbir Singh <balbir@linux.vnet.ibm.com>2008-04-29 01:00:16 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2008-04-29 08:06:10 -0700
commitcf475ad28ac35cc9ba612d67158f29b73b38b05d (patch)
tree2c7cd568d00357bd42643ea602884e731cc24f26 /init
parent29486df325e1fe6e1764afcb19e3370804c2b002 (diff)
downloadlinux-stericsson-cf475ad28ac35cc9ba612d67158f29b73b38b05d.tar.gz
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/Kconfig7
-rw-r--r--init/main.c1
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();