[Devel] Re: [PATCH 00/10] memcg: per cgroup dirty page accounting

[Greg Thelen]

Balbir Singh <balbir at linux.vnet.ibm.com> writes:
>
> * Greg Thelen <gthelen at google.com> [2010-10-03 23:57:55]:
>
>> This patch set provides the ability for each cgroup to have independent dirty
>> page limits.
>> 
>> Limiting dirty memory is like fixing the max amount of dirty (hard to reclaim)
>> page cache used by a cgroup.  So, in case of multiple cgroup writers, they will
>> not be able to consume more than their designated share of dirty pages and will
>> be forced to perform write-out if they cross that limit.
>> 
>> These patches were developed and tested on mmotm 2010-09-28-16-13.  The patches
>> are based on a series proposed by Andrea Righi in Mar 2010.
>
> Hi, Greg,
>
> I see a problem with "    memcg: add dirty page accounting infrastructure".
>
> The reject is
>
>  enum mem_cgroup_write_page_stat_item {
>         MEMCG_NR_FILE_MAPPED, /* # of pages charged as file rss */
> +       MEMCG_NR_FILE_DIRTY, /* # of dirty pages in page cache */
> +       MEMCG_NR_FILE_WRITEBACK, /* # of pages under writeback */
> +       MEMCG_NR_FILE_UNSTABLE_NFS, /* # of NFS unstable pages */
>  };
>
> I don't see mem_cgroup_write_page_stat_item in memcontrol.h. Is this
> based on top of Kame's cleanup.
>
> I am working off of mmotm 28 sept 2010 16:13.

Balbir,

All of the 10 memcg dirty limits patches should apply directly to mmotm
28 sept 2010 16:13 without any other patches.  Any of Kame's cleanup
patches that are not in mmotm are not needed by this memcg dirty limit
series.

The patch you refer to, "[PATCH 05/10] memcg: add dirty page accounting
infrastructure" depends on a change from an earlier patch in the series.
Specifically, "[PATCH 03/10] memcg: create extensible page stat update
routines" contains the addition of mem_cgroup_write_page_stat_item:

--- a/include/linux/memcontrol.h
+++ b/include/linux/memcontrol.h
@@ -25,6 +25,11 @@ struct page_cgroup;
 struct page;
 struct mm_struct;
 
+/* Stats that can be updated by kernel. */
+enum mem_cgroup_write_page_stat_item {
+     MEMCG_NR_FILE_MAPPED, /* # of pages charged as file rss */
+};
+

Do you have trouble applying patch 5 after applying patches 1-4?
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