linux-kernel - Re: [PATCH 1/2] memcg: remove MEMCG_NR_FILE

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Message-ID: <CAFj3OHUcat5TwAn2FQbJo02sGULmq6r=k3DOkhK6GBXPwOroPw@mail.gmail.com>
Date:	Sun, 17 Jun 2012 14:53:22 +0800
From:	Sha Zhengju <handai.szj@...il.com>
To:	Greg Thelen <gthelen@...gle.com>
Cc:	linux-mm@...ck.org, cgroups@...r.kernel.org,
	kamezawa.hiroyu@...fujitsu.com, yinghan@...gle.com,
	akpm@...ux-foundation.org, linux-kernel@...r.kernel.org,
	Sha Zhengju <handai.szj@...bao.com>
Subject: Re: [PATCH 1/2] memcg: remove MEMCG_NR_FILE_MAPPED

On Fri, Jun 15, 2012 at 11:18 PM, Greg Thelen <gthelen@...gle.com> wrote:
> On Fri, Jun 15 2012, Sha Zhengju wrote:
>
>> While doing memcg page stat accounting, there's no need to use MEMCG_NR_FILE_MAPPED
>> as an intermediate, we can use MEM_CGROUP_STAT_FILE_MAPPED directly.
>>
>> Signed-off-by: Sha Zhengju <handai.szj@...bao.com>
>> ---
>>  include/linux/memcontrol.h |   22 ++++++++++++++++------
>>  mm/memcontrol.c            |   25 +------------------------
>>  mm/rmap.c                  |    4 ++--
>>  3 files changed, 19 insertions(+), 32 deletions(-)
>
> I assume this patch is relative to v3.4.
>


Yeah, I cook it based on linux-stable v3.4.


>> diff --git a/include/linux/memcontrol.h b/include/linux/memcontrol.h
>> index f94efd2..a337c2e 100644
>> --- a/include/linux/memcontrol.h
>> +++ b/include/linux/memcontrol.h
>> @@ -27,9 +27,19 @@ struct page_cgroup;
>>  struct page;
>>  struct mm_struct;
>>
>> -/* Stats that can be updated by kernel. */
>> -enum mem_cgroup_page_stat_item {
>> -     MEMCG_NR_FILE_MAPPED, /* # of pages charged as file rss */
>> +/*
>> + * Statistics for memory cgroup.
>> + */
>> +enum mem_cgroup_stat_index {
>> +     /*
>> +      * For MEM_CONTAINER_TYPE_ALL, usage = pagecache + rss.
>> +      */
>> +     MEM_CGROUP_STAT_CACHE,     /* # of pages charged as cache */
>> +     MEM_CGROUP_STAT_RSS,       /* # of pages charged as anon rss */
>> +     MEM_CGROUP_STAT_FILE_MAPPED,  /* # of pages charged as file rss */
>> +     MEM_CGROUP_STAT_SWAPOUT, /* # of pages, swapped out */
>> +     MEM_CGROUP_STAT_DATA, /* end of data requires synchronization */
>> +     MEM_CGROUP_STAT_NSTATS,
>>  };
>
> This has unfortunate side effect of letting code outside of memcontrol.c
> manipulate memcg internally managed statistics
> (e.g. MEM_CGROUP_STAT_CACHE) with mem_cgroup_{dec,inc}_page_stat.  I
> think that your change is fine.  The complexity and presumed performance
> overhead of the extra layer of indirection was not worth it.
>
>>  struct mem_cgroup_reclaim_cookie {
>> @@ -170,17 +180,17 @@ static inline void mem_cgroup_end_update_page_stat(struct page *page,
>>  }
>>
>>  void mem_cgroup_update_page_stat(struct page *page,
>> -                              enum mem_cgroup_page_stat_item idx,
>> +                              enum mem_cgroup_stat_index idx,
>>                                int val);
>>
>>  static inline void mem_cgroup_inc_page_stat(struct page *page,
>> -                                         enum mem_cgroup_page_stat_item idx)
>> +                                         enum mem_cgroup_stat_index idx)
>>  {
>>       mem_cgroup_update_page_stat(page, idx, 1);
>>  }
>>
>>  static inline void mem_cgroup_dec_page_stat(struct page *page,
>> -                                         enum mem_cgroup_page_stat_item idx)
>> +                                         enum mem_cgroup_stat_index idx)
>>  {
>>       mem_cgroup_update_page_stat(page, idx, -1);
>>  }
>
> You missed two more uses of enum mem_cgroup_page_stat_item in
> memcontrol.h.
>

Ah, I find them, thanks for reviewing!


Thanks,
Sha
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