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    Subject[PATCH 5/5] have smaps show transparent huge pages
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    Now that the mere act of _looking_ at /proc/$pid/smaps will not
    destroy transparent huge pages, tell how much of the VMA is
    actually mapped with them.

    This way, we can make sure that we're getting THPs where we
    expect to see them.

    v3 - * changed HPAGE_SIZE to HPAGE_PMD_SIZE, probably more correct
    and also has a nice BUG() in case there was a .config mishap
    * remove direct reference to ->page_table_lock, and used the
    passed-in ptl pointer insteadl

    Acked-by: Mel Gorman <mel@csn.ul.ie>
    Acked-by: David Rientjes <rientjes@google.com>
    Signed-off-by: Dave Hansen <dave@linux.vnet.ibm.com>
    ---

    linux-2.6.git-dave/fs/proc/task_mmu.c | 4 ++++
    1 file changed, 4 insertions(+)

    diff -puN fs/proc/task_mmu.c~teach-smaps-thp fs/proc/task_mmu.c
    --- linux-2.6.git/fs/proc/task_mmu.c~teach-smaps-thp 2011-02-21 15:07:55.707591741 -0800
    +++ linux-2.6.git-dave/fs/proc/task_mmu.c 2011-02-21 15:07:55.803594580 -0800
    @@ -331,6 +331,7 @@ struct mem_size_stats {
    unsigned long private_dirty;
    unsigned long referenced;
    unsigned long anonymous;
    + unsigned long anonymous_thp;
    unsigned long swap;
    u64 pss;
    };
    @@ -396,6 +397,7 @@ static int smaps_pte_range(pmd_t *pmd, u
    smaps_pte_entry(*(pte_t *)pmd, addr,
    HPAGE_PMD_SIZE, walk);
    spin_unlock(&walk->mm->page_table_lock);
    + mss->anonymous_thp += HPAGE_PMD_SIZE;
    return 0;
    }
    } else {
    @@ -444,6 +446,7 @@ static int show_smap(struct seq_file *m,
    "Private_Dirty: %8lu kB\n"
    "Referenced: %8lu kB\n"
    "Anonymous: %8lu kB\n"
    + "AnonHugePages: %8lu kB\n"
    "Swap: %8lu kB\n"
    "KernelPageSize: %8lu kB\n"
    "MMUPageSize: %8lu kB\n"
    @@ -457,6 +460,7 @@ static int show_smap(struct seq_file *m,
    mss.private_dirty >> 10,
    mss.referenced >> 10,
    mss.anonymous >> 10,
    + mss.anonymous_thp >> 10,
    mss.swap >> 10,
    vma_kernel_pagesize(vma) >> 10,
    vma_mmu_pagesize(vma) >> 10,
    diff -puN include/linux/huge_mm.h~teach-smaps-thp include/linux/huge_mm.h
    diff -puN mm/memory-failure.c~teach-smaps-thp mm/memory-failure.c
    diff -puN mm/huge_memory.c~teach-smaps-thp mm/huge_memory.c
    _

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