On 04/12/10 23:58, KAMEZAWA Hiroyuki wrote:
> On Tue, 13 Apr 2010 12:18:55 +0530
> Balbir Singh <balbir@xxxxxxxxxxxxxxxxxx> wrote:
>
>> * KAMEZAWA Hiroyuki <kamezawa.hiroyu@xxxxxxxxxxxxxx> [2010-04-13 15:20:48]:
>>
>> [snip]
>>
>> The alignment does not show up in the patches, hence the comments
>>
>
> Should I replace TABs with SPACEs ? I think my mailer doesn't
> break TABS...
I'd stay with tabs.
> Signed-off-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@xxxxxxxxxxxxxx>
> ---
> Documentation/cgroups/memory.txt | 277 ++++++++++++++++++++++++++-------------
> 1 file changed, 188 insertions(+), 89 deletions(-)
>
> Index: mmotm-temp/Documentation/cgroups/memory.txt
> ===================================================================
> --- mmotm-temp.orig/Documentation/cgroups/memory.txt
> +++ mmotm-temp/Documentation/cgroups/memory.txt
> @@ -33,6 +23,45 @@ d. A CD/DVD burner could control the amo
> e. There are several other use cases, find one or use the controller just
> for fun (to learn and hack on the VM subsystem).
>
> +Current Status: linux-2.6.34-mmotm(development version of 2010/April)
> +
> +Features:
> + - accounting anonymous pages, file caches, swap caches usage and limit them.
and limiting them.
> + - private LRU and reclaim routine. (system's global LRU and private LRU
> + work independently from each other)
> + - optionally, memory+swap usage can be accounted and limited.
> + - hierarchical accounting
> + - soft limit
> + - moving(recharging) account at moving a task is selectable.
> + - usage threshold notifier
> + - oom-killer disable knob and oom-notifier
> + - Root cgroup has no limit controls.
> +
> + Kernel memory and Hugepages are not under control yet. We just manage
> + pages on LRU. To add more controls, we have to take care of performance.
> +
> +Brief summary of control files.
> @@ -121,12 +150,19 @@ inserted into inode (radix-tree). While
> processes, duplicate accounting is carefully avoided.
>
> A RSS page is unaccounted when it's fully unmapped. A PageCache page is
> -unaccounted when it's removed from radix-tree.
> +unaccounted when it's removed from radix-tree. Even if RSS pages are fully
> +unmapped (by kswapd), they may exist as SwapCache in the system until they
> +are really freed. Such SwapCaches also also accounted.
> +A swapped-in page is not accounted until it's mapped.
> +
> +Note: The kernel does swapin-readahead and read multiple swaps at once.
> +This means swapped-in pages may contain pages for other tasks than a task
> +causing page fault. So, we avoid accounting at swap-in I/O.
>
> At page migration, accounting information is kept.
>
> -Note: we just account pages-on-lru because our purpose is to control amount
> -of used pages. not-on-lru pages are tend to be out-of-control from vm view.
> +Note: we just account pages-on-LRU because our purpose is to control amount
> +of used pages, not-on-LRU pages tend to be out-of-control from VM view.
using a ; there would be even better.
(yes, I know that you just changed it.)
>
> 2.3 Shared Page Accounting
>
> @@ -209,31 +260,29 @@ c. Enable CONFIG_CGROUP_MEM_RES_CTLR
>
> 2. Make the new group and move bash into it
> # mkdir /cgroups/0
> -# echo $$ > /cgroups/0/tasks
> +# echo $$ > /cgroups/0/tasks
>
> Since now we're in the 0 cgroup,
> We can alter the memory limit:
we
(and no need for 2 lines above)
> # echo 4M > /cgroups/0/memory.limit_in_bytes
> @@ -418,7 +516,7 @@ If we want to change this to 1G, we can
> # echo 1G > memory.soft_limit_in_bytes
>
> NOTE1: Soft limits take effect over a long period of time, since they involve
> - reclaiming memory for balancing between memory cgroups
> +reclaiming memory for balancing between memory cgroups
Put the indentation back, please.
> NOTE2: It is recommended to set the soft limit always below the hard limit,
> otherwise the hard limit will take precedence.
>
--
~Randy
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