linux.git/mm/memcontrol.c, branch v2.6.26

memcg: simple stats for memory resource controller

2008-05-01T15:04:02+00:00

Implement trivial statistics for the memory resource controller.

Signed-off-by: Balaji Rao 
Acked-by: Balbir Singh 
Cc: Dhaval Giani 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

memcg: remove redundant initialization in mem_cgroup_create()

2008-04-29T15:06:11+00:00

*mem has been zeroed, that means mem->info has already been filled with 0.

Signed-off-by: Li Zefan 
Acked-by: KAMEZAWA Hiroyuki 
Acked-by: Balbir Singh 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

memcgroup: use vmalloc for mem_cgroup allocation

2008-04-29T15:06:11+00:00

On ia64, this kmalloc() requires order-4 pages.  But this is not necessary to
be physically contiguous.  For big mem_cgroup, vmalloc is better.  For small
ones, kmalloc is used.

[akpm@linux-foundation.org: simplification]
Signed-off-by: KAMEZAWA Hiroyuki 
Cc: Pavel Emelyanov 
Cc: Li Zefan 
Cc: Balbir Singh 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

memcgroup: make the memory controller more desktop responsive

2008-04-29T15:06:11+00:00

This patch makes the memory controller more responsive on my desktop.

1. Set all cached pages as inactive.  We were by default marking all pages
   as active, thus forcing us to go through two passes for reclaiming pages

2. Remove congestion_wait(), since we already have that logic in
   do_try_to_free_pages()

Signed-off-by: Balbir Singh 
Reviewed-by: KOSAKI Motohiro 
Cc: YAMAMOTO Takashi 
Cc: Paul Menage 
Cc: Pavel Emelianov 
Cc: KAMEZAWA Hiroyuki 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

memcg: remove redundant function calls

2008-04-29T15:06:10+00:00

remove_list/add_list uses page_cgroup_zoneinfo() in it.

So, it's called twice before and after lock.

	mz = page_cgroup_zoneinfo();
	lock();
	mz = page_cgroup_zoneinfo();
	....
	unlock();

And address of mz never changes.

This is not good. This patch fixes this behavior.

Signed-off-by: KAMEZAWA Hiroyuki 
Cc: Balbir Singh 
Cc: Pavel Emelyanov 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

memcgroup: implement failcounter reset

2008-04-29T15:06:10+00:00

This is a very common requirement from people using the resource accounting
facilities (not only memcgroup but also OpenVZ beancounters).  They want to
put the cgroup in an initial state without re-creating it.

For example after re-configuring a group people want to observe how this new
configuration fits the group needs without saving the previous failcnt value.

Merge two resets into one mem_cgroup_reset() function to demonstrate how
multiplexing work.

Besides, I have plans to move the files, that correspond to res_counter to the
res_counter.c file and somehow "import" them into controller.  I don't know
how to make it gracefully yet, but merging resets of max_usage and failcnt in
one function will be there for sure.

[akpm@linux-foundation.org: coding-style fixes]
Signed-off-by: Pavel Emelyanov 
Acked-by: KAMEZAWA Hiroyuki 
Cc: Balbir Singh 
Cc: Paul Menage 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

memcgroup: use triggers in force_empty and max_usage files

2008-04-29T15:06:10+00:00

These two files are essentially event callbacks.  They do not care about the
contents of the string, but only about the fact of the write itself.

Signed-off-by: Pavel Emelyanov 
Acked-by: KAMEZAWA Hiroyuki 
Cc: Balbir Singh 
Cc: Paul Menage 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

memcgroup: move memory controller allocations to their own slabs

2008-04-29T15:06:10+00:00

Move the memory controller data structure page_cgroup to its own slab cache.
It saves space on the system, allocations are not necessarily pushed to order
of 2 and should provide performance benefits.  Users who disable the memory
controller can also double check that the memory controller is not allocating
page_cgroup's.

NOTE: Hugh Dickins brought up the issue of whether we want to mark page_cgroup
as __GFP_MOVABLE or __GFP_RECLAIMABLE.  I don't think there is an easy answer
at the moment.  page_cgroup's are associated with user pages, they can be
reclaimed once the user page has been reclaimed, so it might make sense to
mark them as __GFP_RECLAIMABLE.  For now, I am leaving the marking to default
values that the slab allocator uses.

Signed-off-by: Balbir Singh 
Cc: Pavel Emelianov 
Cc: Hugh Dickins 
Cc: Sudhir Kumar 
Cc: YAMAMOTO Takashi 
Cc: Paul Menage 
Cc: David Rientjes 
Cc: KAMEZAWA Hiroyuki 
Cc: Mel Gorman 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

memcgroup: add the max_usage member on the res_counter

2008-04-29T15:06:10+00:00

This field is the maximal value of the usage one since the counter creation
(or since the latest reset).

To reset this to the usage value simply write anything to the appropriate
cgroup file.

Signed-off-by: Pavel Emelyanov 
Acked-by: Balbir Singh 
Cc: KAMEZAWA Hiroyuki 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

cgroups: add an owner to the mm_struct

2008-04-29T15:06:10+00:00

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 
Cc: Pavel Emelianov 
Cc: Hugh Dickins 
Cc: Sudhir Kumar 
Cc: YAMAMOTO Takashi 
Cc: Hirokazu Takahashi 
Cc: David Rientjes ,
Cc: Balbir Singh 
Acked-by: KAMEZAWA Hiroyuki 
Acked-by: Pekka Enberg 
Reviewed-by: Paul Menage 
Cc: Oleg Nesterov 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds