mm: memcontrol: add file_thp, shmem_thp to memory.stat

As huge page usage in the page cache and for shmem files proliferates in
our production environment, the performance monitoring team has asked for
per-cgroup stats on those pages.

We already track and export anon_thp per cgroup.  We already track file
THP and shmem THP per node, so making them per-cgroup is only a matter of
switching from node to lruvec counters.  All callsites are in places where
the pages are charged and locked, so page->memcg is stable.

[hannes@cmpxchg.org: add documentation]
Link: https://lkml.kernel.org/r/20201026174029.GC548555@cmpxchg.org
Link: https://lkml.kernel.org/r/20201022151844.489337-1-hannes@cmpxchg.org
Signed-off-by: Johannes Weiner <hannes@cmpxchg.org>
Reviewed-by: Rik van Riel <riel@surriel.com>
Reviewed-by: Shakeel Butt <shakeelb@google.com>
Acked-by: David Rientjes <rientjes@google.com>
Acked-by: Michal Hocko <mhocko@suse.com>
Acked-by: Song Liu <songliubraving@fb.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/Documentation/admin-guide/cgroup-v2.rst b/Documentation/admin-guide/cgroup-v2.rst
index 608d7c2..515bb13 100644 (file)
--- a/Documentation/admin-guide/cgroup-v2.rst
+++ b/Documentation/admin-guide/cgroup-v2.rst
@@ -1300,6 +1300,14 @@ PAGE_SIZE multiple when read back.
                Amount of memory used in anonymous mappings backed by
                transparent hugepages
 
+         file_thp
+               Amount of cached filesystem data backed by transparent
+               hugepages
+
+         shmem_thp
+               Amount of shm, tmpfs, shared anonymous mmap()s backed by
+               transparent hugepages
+
          inactive_anon, active_anon, inactive_file, active_file, unevictable
                Amount of memory, swap-backed and filesystem-backed,
                on the internal memory management lists used by the

diff --git a/mm/filemap.c b/mm/filemap.c
index 343ba85..39bb881 100644 (file)
--- a/mm/filemap.c
+++ b/mm/filemap.c
@@ -204,9 +204,9 @@ static void unaccount_page_cache_page(struct address_space *mapping,
        if (PageSwapBacked(page)) {
                __mod_lruvec_page_state(page, NR_SHMEM, -nr);
                if (PageTransHuge(page))
-                       __dec_node_page_state(page, NR_SHMEM_THPS);
+                       __dec_lruvec_page_state(page, NR_SHMEM_THPS);
        } else if (PageTransHuge(page)) {
-               __dec_node_page_state(page, NR_FILE_THPS);
+               __dec_lruvec_page_state(page, NR_FILE_THPS);
                filemap_nr_thps_dec(mapping);
        }
 

diff --git a/mm/huge_memory.c b/mm/huge_memory.c
index ec2bb93..42b18d4 100644 (file)
--- a/mm/huge_memory.c
+++ b/mm/huge_memory.c
@@ -2710,9 +2710,9 @@ int split_huge_page_to_list(struct page *page, struct list_head *list)
                spin_unlock(&ds_queue->split_queue_lock);
                if (mapping) {
                        if (PageSwapBacked(head))
-                               __dec_node_page_state(head, NR_SHMEM_THPS);
+                               __dec_lruvec_page_state(head, NR_SHMEM_THPS);
                        else
-                               __dec_node_page_state(head, NR_FILE_THPS);
+                               __dec_lruvec_page_state(head, NR_FILE_THPS);
                }
 
                __split_huge_page(page, list, end, flags);

diff --git a/mm/khugepaged.c b/mm/khugepaged.c
index 4e3dff1..7572925 100644 (file)
--- a/mm/khugepaged.c
+++ b/mm/khugepaged.c
@@ -1845,9 +1845,9 @@ out_unlock:
        }
 
        if (is_shmem)
-               __inc_node_page_state(new_page, NR_SHMEM_THPS);
+               __inc_lruvec_page_state(new_page, NR_SHMEM_THPS);
        else {
-               __inc_node_page_state(new_page, NR_FILE_THPS);
+               __inc_lruvec_page_state(new_page, NR_FILE_THPS);
                filemap_nr_thps_inc(mapping);
        }
 

diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index 29459a6..c365451 100644 (file)
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -1512,6 +1512,8 @@ static struct memory_stat memory_stats[] = {
         * constant(e.g. powerpc).
         */
        { "anon_thp", 0, NR_ANON_THPS },
+       { "file_thp", 0, NR_FILE_THPS },
+       { "shmem_thp", 0, NR_SHMEM_THPS },
 #endif
        { "inactive_anon", PAGE_SIZE, NR_INACTIVE_ANON },
        { "active_anon", PAGE_SIZE, NR_ACTIVE_ANON },
@@ -1542,7 +1544,9 @@ static int __init memory_stats_init(void)
 
        for (i = 0; i < ARRAY_SIZE(memory_stats); i++) {
 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
-               if (memory_stats[i].idx == NR_ANON_THPS)
+               if (memory_stats[i].idx == NR_ANON_THPS ||
+                   memory_stats[i].idx == NR_FILE_THPS ||
+                   memory_stats[i].idx == NR_SHMEM_THPS)
                        memory_stats[i].ratio = HPAGE_PMD_SIZE;
 #endif
                VM_BUG_ON(!memory_stats[i].ratio);

diff --git a/mm/shmem.c b/mm/shmem.c
index b7361fc..67ff829 100644 (file)
--- a/mm/shmem.c
+++ b/mm/shmem.c
@@ -713,7 +713,7 @@ next:
                }
                if (PageTransHuge(page)) {
                        count_vm_event(THP_FILE_ALLOC);
-                       __inc_node_page_state(page, NR_SHMEM_THPS);
+                       __inc_lruvec_page_state(page, NR_SHMEM_THPS);
                }
                mapping->nrpages += nr;
                __mod_lruvec_page_state(page, NR_FILE_PAGES, nr);