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SubjectRe: [PATCH v3 06/21] mm: lruvec linking functions
KAMEZAWA Hiroyuki wrote:
> On Thu, 23 Feb 2012 17:52:04 +0400
> Konstantin Khlebnikov<khlebnikov@openvz.org> wrote:
>
>> This patch adds links from page to its lruvec and from lruvec to its zone and node.
>> If CONFIG_CGROUP_MEM_RES_CTLR=n they just page_zone() and container_of().
>>
>> Signed-off-by: Konstantin Khlebnikov<khlebnikov@openvz.org>
>
> small comments in below.
>
>> ---
>> include/linux/mm.h | 37 +++++++++++++++++++++++++++++++++++++
>> include/linux/mmzone.h | 12 ++++++++----
>> mm/internal.h | 1 +
>> mm/memcontrol.c | 27 ++++++++++++++++++++++++---
>> mm/page_alloc.c | 17 ++++++++++++++---
>> 5 files changed, 84 insertions(+), 10 deletions(-)
>>
>> diff --git a/include/linux/mm.h b/include/linux/mm.h
>> index ee3ebc1..c6dc4ab 100644
>> --- a/include/linux/mm.h
>> +++ b/include/linux/mm.h
>> @@ -728,6 +728,43 @@ static inline void set_page_links(struct page *page, enum zone_type zone,
>> #endif
>> }
>>
>> +#ifdef CONFIG_CGROUP_MEM_RES_CTLR
>> +
>> +/* Multiple lruvecs in zone */
>> +
>> +extern struct lruvec *page_lruvec(struct page *page);
>> +
>> +static inline struct zone *lruvec_zone(struct lruvec *lruvec)
>> +{
>> + return lruvec->zone;
>> +}
>> +
>> +static inline struct pglist_data *lruvec_node(struct lruvec *lruvec)
>> +{
>> + return lruvec->node;
>> +}
>> +
>> +#else /* CONFIG_CGROUP_MEM_RES_CTLR */
>> +
>> +/* Single lruvec in zone */
>> +
>> +static inline struct lruvec *page_lruvec(struct page *page)
>> +{
>> + return&page_zone(page)->lruvec;
>> +}
>> +
>> +static inline struct zone *lruvec_zone(struct lruvec *lruvec)
>> +{
>> + return container_of(lruvec, struct zone, lruvec);
>> +}
>> +
>> +static inline struct pglist_data *lruvec_node(struct lruvec *lruvec)
>> +{
>> + return lruvec_zone(lruvec)->zone_pgdat;
>> +}
>> +
>> +#endif /* CONFIG_CGROUP_MEM_RES_CTLR */
>> +
>> /*
>> * Some inline functions in vmstat.h depend on page_zone()
>> */
>> diff --git a/include/linux/mmzone.h b/include/linux/mmzone.h
>> index ddd0fd2..be8873a 100644
>> --- a/include/linux/mmzone.h
>> +++ b/include/linux/mmzone.h
>> @@ -159,10 +159,6 @@ static inline int is_unevictable_lru(enum lru_list lru)
>> return (lru == LRU_UNEVICTABLE);
>> }
>>
>> -struct lruvec {
>> - struct list_head pages_lru[NR_LRU_LISTS];
>> -};
>> -
>> /* Mask used at gathering information at once (see memcontrol.c) */
>> #define LRU_ALL_FILE (BIT(LRU_INACTIVE_FILE) | BIT(LRU_ACTIVE_FILE))
>> #define LRU_ALL_ANON (BIT(LRU_INACTIVE_ANON) | BIT(LRU_ACTIVE_ANON))
>> @@ -300,6 +296,14 @@ struct zone_reclaim_stat {
>> unsigned long recent_scanned[2];
>> };
>>
>> +struct lruvec {
>> + struct list_head pages_lru[NR_LRU_LISTS];
>> +#ifdef CONFIG_CGROUP_MEM_RES_CTLR
>> + struct zone *zone;
>> + struct pglist_data *node;
>> +#endif
>
> I don't think this #ifdef is very good ....this adds other #ifdefs in other headers.
> How bad if we remove this #ifdef and use ->zone, ->pgdat in lruvec_zone, lruvec_page
> always ?

This adds one dereference in lruvec_zone() if memcg is disabled in config.
We can remove ifdef from declaration and initialization, but keep optimized variant of lruvec_zone()

>
> There may be concerns to fit lruvec at el into cache-line...but this set will add
> a (big) hash here later..
>
> I'm sorry if you're asked to add this #ifdef in v1 or v2.
>
> Thanks,
> -Kame
>



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