Re: [mmotm][PATCH 1/5] clean up mm_counter

[Minchan Kim]

On Tue, 15 Dec 2009 18:11:16 +0900
KAMEZAWA Hiroyuki <kamezawa.hiroyu@xxxxxxxxxxxxxx> wrote:

> From: KAMEZAWA Hiroyuki <kamezawa.hiroyu@xxxxxxxxxxxxxx>
> 
> Now, per-mm statistics counter is defined by macro in sched.h
> 
> This patch modifies it to
>   - defined in mm.h as inlinf functions
>   - use array instead of macro's name creation.
> 
> This patch is for reducing patch size in future patch to modify
> implementation of per-mm counter.
> 
> Changelog: 2009/12/14
>  - added a struct rss_stat instead of bare counters.
>  - use memset instead of for() loop.
>  - rewrite macros into static inline functions.
> 
> Signed-off-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@xxxxxxxxxxxxxx>
> ---
>  fs/proc/task_mmu.c       |    4 -
>  include/linux/mm.h       |  104 +++++++++++++++++++++++++++++++++++++++++++++++
>  include/linux/mm_types.h |   33 +++++++++-----
>  include/linux/sched.h    |   54 ------------------------
>  kernel/fork.c            |    3 -
>  kernel/tsacct.c          |    1 
>  mm/filemap_xip.c         |    2 
>  mm/fremap.c              |    2 
>  mm/memory.c              |   56 +++++++++++++++----------
>  mm/oom_kill.c            |    4 -
>  mm/rmap.c                |   10 ++--
>  mm/swapfile.c            |    2 
>  12 files changed, 174 insertions(+), 101 deletions(-)
> 
> Index: mmotm-2.6.32-Dec8-pth/include/linux/mm.h
> ===================================================================
> --- mmotm-2.6.32-Dec8-pth.orig/include/linux/mm.h
> +++ mmotm-2.6.32-Dec8-pth/include/linux/mm.h
> @@ -868,6 +868,110 @@ extern int mprotect_fixup(struct vm_area
>   */
>  int __get_user_pages_fast(unsigned long start, int nr_pages, int write,
>  			  struct page **pages);
> +/*
> + * per-process(per-mm_struct) statistics.
> + */
> +#if USE_SPLIT_PTLOCKS
> +/*
> + * The mm counters are not protected by its page_table_lock,
> + * so must be incremented atomically.
> + */
> +static inline void set_mm_counter(struct mm_struct *mm, int member, long value)
> +{
> +	atomic_long_set(&mm->rss_stat.count[member], value);
> +}

I can't find mm->rss_stat in this patch.
Maybe it's part of next patch. 
It could break bisect.

Otherwise, Looks good to me. 

Reviewed-by: Minchan Kim <minchan.kim@xxxxxxxxx>

-- 
Kind regards,
Minchan Kim
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