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    Subject[RFC v2 PATCH 5/8] mm: introduce a new zone_stat_item NR_FREE_MIRROR_PAGES
    This patch introduces a new zone_stat_item called "NR_FREE_MIRROR_PAGES", it is
    used to storage free mirrored pages count.

    Signed-off-by: Xishi Qiu <qiuxishi@huawei.com>
    ---
    include/linux/mmzone.h | 1 +
    include/linux/vmstat.h | 2 ++
    mm/vmstat.c | 1 +
    3 files changed, 4 insertions(+)

    diff --git a/include/linux/mmzone.h b/include/linux/mmzone.h
    index 54e891a..7cc0a29 100644
    --- a/include/linux/mmzone.h
    +++ b/include/linux/mmzone.h
    @@ -166,6 +166,7 @@ enum zone_stat_item {
    WORKINGSET_NODERECLAIM,
    NR_ANON_TRANSPARENT_HUGEPAGES,
    NR_FREE_CMA_PAGES,
    + NR_FREE_MIRROR_PAGES,
    NR_VM_ZONE_STAT_ITEMS };

    /*
    diff --git a/include/linux/vmstat.h b/include/linux/vmstat.h
    index 82e7db7..d0a7268 100644
    --- a/include/linux/vmstat.h
    +++ b/include/linux/vmstat.h
    @@ -283,6 +283,8 @@ static inline void __mod_zone_freepage_state(struct zone *zone, int nr_pages,
    __mod_zone_page_state(zone, NR_FREE_PAGES, nr_pages);
    if (is_migrate_cma(migratetype))
    __mod_zone_page_state(zone, NR_FREE_CMA_PAGES, nr_pages);
    + if (is_migrate_mirror(migratetype))
    + __mod_zone_page_state(zone, NR_FREE_MIRROR_PAGES, nr_pages);
    }

    extern const char * const vmstat_text[];
    diff --git a/mm/vmstat.c b/mm/vmstat.c
    index d0323e0..7ee11ca 100644
    --- a/mm/vmstat.c
    +++ b/mm/vmstat.c
    @@ -739,6 +739,7 @@ const char * const vmstat_text[] = {
    "workingset_nodereclaim",
    "nr_anon_transparent_hugepages",
    "nr_free_cma",
    + "nr_free_mirror",

    /* enum writeback_stat_item counters */
    "nr_dirty_threshold",
    --
    2.0.0



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