thp: transparent hugepage vmstat

Add hugepage stat information to /proc/vmstat and /proc/meminfo.

Signed-off-by: Andrea Arcangeli <aarcange@redhat.com>
Acked-by: Rik van Riel <riel@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/fs/proc/meminfo.c b/fs/proc/meminfo.c
index a65239c..ed257d1 100644 (file)
--- a/fs/proc/meminfo.c
+++ b/fs/proc/meminfo.c
@@ -100,6 +100,9 @@ static int meminfo_proc_show(struct seq_file *m, void *v)
                "VmallocChunk:   %8lu kB\n"
 #ifdef CONFIG_MEMORY_FAILURE
                "HardwareCorrupted: %5lu kB\n"
+#endif
+#ifdef CONFIG_TRANSPARENT_HUGEPAGE
+               "AnonHugePages:  %8lu kB\n"
 #endif
                ,
                K(i.totalram),
@@ -128,7 +131,12 @@ static int meminfo_proc_show(struct seq_file *m, void *v)
                K(i.freeswap),
                K(global_page_state(NR_FILE_DIRTY)),
                K(global_page_state(NR_WRITEBACK)),
-               K(global_page_state(NR_ANON_PAGES)),
+               K(global_page_state(NR_ANON_PAGES)
+#ifdef CONFIG_TRANSPARENT_HUGEPAGE
+                 + global_page_state(NR_ANON_TRANSPARENT_HUGEPAGES) *
+                 HPAGE_PMD_NR
+#endif
+                 ),
                K(global_page_state(NR_FILE_MAPPED)),
                K(global_page_state(NR_SHMEM)),
                K(global_page_state(NR_SLAB_RECLAIMABLE) +
@@ -150,6 +158,10 @@ static int meminfo_proc_show(struct seq_file *m, void *v)
                vmi.largest_chunk >> 10
 #ifdef CONFIG_MEMORY_FAILURE
                ,atomic_long_read(&mce_bad_pages) << (PAGE_SHIFT - 10)
+#endif
+#ifdef CONFIG_TRANSPARENT_HUGEPAGE
+               ,K(global_page_state(NR_ANON_TRANSPARENT_HUGEPAGES) *
+                  HPAGE_PMD_NR)
 #endif
                );
 

diff --git a/include/linux/mmzone.h b/include/linux/mmzone.h
index dad3612..02ecb01 100644 (file)
--- a/include/linux/mmzone.h
+++ b/include/linux/mmzone.h
@@ -114,6 +114,7 @@ enum zone_stat_item {
        NUMA_LOCAL,             /* allocation from local node */
        NUMA_OTHER,             /* allocation from other node */
 #endif
+       NR_ANON_TRANSPARENT_HUGEPAGES,
        NR_VM_ZONE_STAT_ITEMS };
 
 /*

diff --git a/mm/huge_memory.c b/mm/huge_memory.c
index a313403..7101112 100644 (file)
--- a/mm/huge_memory.c
+++ b/mm/huge_memory.c
@@ -751,6 +751,9 @@ static void __split_huge_page_refcount(struct page *page)
                lru_add_page_tail(zone, page, page_tail);
        }
 
+       __dec_zone_page_state(page, NR_ANON_TRANSPARENT_HUGEPAGES);
+       __mod_zone_page_state(zone, NR_ANON_PAGES, HPAGE_PMD_NR);
+
        ClearPageCompound(page);
        compound_unlock(page);
        spin_unlock_irq(&zone->lru_lock);

diff --git a/mm/rmap.c b/mm/rmap.c
index 92e14dc..3825ae4 100644 (file)
--- a/mm/rmap.c
+++ b/mm/rmap.c
@@ -882,8 +882,13 @@ void do_page_add_anon_rmap(struct page *page,
        struct vm_area_struct *vma, unsigned long address, int exclusive)
 {
        int first = atomic_inc_and_test(&page->_mapcount);
-       if (first)
-               __inc_zone_page_state(page, NR_ANON_PAGES);
+       if (first) {
+               if (!PageTransHuge(page))
+                       __inc_zone_page_state(page, NR_ANON_PAGES);
+               else
+                       __inc_zone_page_state(page,
+                                             NR_ANON_TRANSPARENT_HUGEPAGES);
+       }
        if (unlikely(PageKsm(page)))
                return;
 
@@ -911,7 +916,10 @@ void page_add_new_anon_rmap(struct page *page,
        VM_BUG_ON(address < vma->vm_start || address >= vma->vm_end);
        SetPageSwapBacked(page);
        atomic_set(&page->_mapcount, 0); /* increment count (starts at -1) */
-       __inc_zone_page_state(page, NR_ANON_PAGES);
+       if (!PageTransHuge(page))
+               __inc_zone_page_state(page, NR_ANON_PAGES);
+       else
+               __inc_zone_page_state(page, NR_ANON_TRANSPARENT_HUGEPAGES);
        __page_set_anon_rmap(page, vma, address, 1);
        if (page_evictable(page, vma))
                lru_cache_add_lru(page, LRU_ACTIVE_ANON);
@@ -964,7 +972,11 @@ void page_remove_rmap(struct page *page)
                return;
        if (PageAnon(page)) {
                mem_cgroup_uncharge_page(page);
-               __dec_zone_page_state(page, NR_ANON_PAGES);
+               if (!PageTransHuge(page))
+                       __dec_zone_page_state(page, NR_ANON_PAGES);
+               else
+                       __dec_zone_page_state(page,
+                                             NR_ANON_TRANSPARENT_HUGEPAGES);
        } else {
                __dec_zone_page_state(page, NR_FILE_MAPPED);
                mem_cgroup_update_file_mapped(page, -1);

diff --git a/mm/vmstat.c b/mm/vmstat.c
index 751a65e..0c3b504 100644 (file)
--- a/mm/vmstat.c
+++ b/mm/vmstat.c
@@ -880,6 +880,7 @@ static const char * const vmstat_text[] = {
        "numa_local",
        "numa_other",
 #endif
+       "nr_anon_transparent_hugepages",
        "nr_dirty_threshold",
        "nr_dirty_background_threshold",