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mm: memcontrol: convert NR_ANON_THPS account to pages 

Currently we use struct per_cpu_nodestat to cache the vmstat counters,
which leads to inaccurate statistics especially THP vmstat counters.  In
the systems with hundreds of processors it can be GBs of memory.  For
example, for a 96 CPUs system, the threshold is the maximum number of 125.
And the per cpu counters can cache 23.4375 GB in total.

The THP page is already a form of batched addition (it will add 512 worth
of memory in one go) so skipping the batching seems like sensible.
Although every THP stats update overflows the per-cpu counter, resorting
to atomic global updates.  But it can make the statistics more accuracy
for the THP vmstat counters.

So we convert the NR_ANON_THPS account to pages.  This patch is consistent
with 8f182270df ("mm/swap.c: flush lru pvecs on compound page arrival").
Doing this also can make the unit of vmstat counters more unified.
Finally, the unit of the vmstat counters are pages, kB and bytes.  The
B/KB suffix can tell us that the unit is bytes or kB.  The rest which is
without suffix are pages.

Link: https://lkml.kernel.org/r/20201228164110.2838-3-songmuchun@bytedance.com
Signed-off-by: Muchun Song <songmuchun@bytedance.com>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Rafael. J. Wysocki <rafael@kernel.org>
Cc: Alexey Dobriyan <adobriyan@gmail.com>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Vladimir Davydov <vdavydov.dev@gmail.com>
Cc: Hugh Dickins <hughd@google.com>
Cc: Shakeel Butt <shakeelb@google.com>
Cc: Roman Gushchin <guro@fb.com>
Cc: Sami Tolvanen <samitolvanen@google.com>
Cc: Feng Tang <feng.tang@intel.com>
Cc: NeilBrown <neilb@suse.de>
Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com>
Cc: Randy Dunlap <rdunlap@infradead.org>
Cc: Michal Hocko <mhocko@suse.com>
Cc: Pankaj Gupta <pankaj.gupta@cloud.ionos.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Muchun Song 2021-02-24 12:03:23 -08:00 committed by Linus Torvalds
parent b0ba3bff3e
commit 69473e5de8
8 changed files with 44 additions and 28 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

15
drivers/base/node.c
View File

@ -461,8 +461,7 @@ static ssize_t node_read_meminfo(struct device *dev,
nid, K(sunreclaimable)
#ifdef CONFIG_TRANSPARENT_HUGEPAGE
,
nid, K(node_page_state(pgdat, NR_ANON_THPS) *
HPAGE_PMD_NR),
nid, K(node_page_state(pgdat, NR_ANON_THPS)),
nid, K(node_page_state(pgdat, NR_SHMEM_THPS) *
HPAGE_PMD_NR),
nid, K(node_page_state(pgdat, NR_SHMEM_PMDMAPPED) *
@ -519,10 +518,14 @@ static ssize_t node_read_vmstat(struct device *dev,
sum_zone_numa_state(nid, i));
#endif
for (i = 0; i < NR_VM_NODE_STAT_ITEMS; i++)
len += sysfs_emit_at(buf, len, "%s %lu\n",
node_stat_name(i),
node_page_state_pages(pgdat, i));
for (i = 0; i < NR_VM_NODE_STAT_ITEMS; i++) {
unsigned long pages = node_page_state_pages(pgdat, i);
if (vmstat_item_print_in_thp(i))
pages /= HPAGE_PMD_NR;
len += sysfs_emit_at(buf, len, "%s %lu\n", node_stat_name(i),
pages);
}
return len;
}

2
fs/proc/meminfo.c
View File

@ -129,7 +129,7 @@ static int meminfo_proc_show(struct seq_file *m, void *v)
#ifdef CONFIG_TRANSPARENT_HUGEPAGE
show_val_kb(m, "AnonHugePages: ",
global_node_page_state(NR_ANON_THPS) * HPAGE_PMD_NR);
global_node_page_state(NR_ANON_THPS));
show_val_kb(m, "ShmemHugePages: ",
global_node_page_state(NR_SHMEM_THPS) * HPAGE_PMD_NR);
show_val_kb(m, "ShmemPmdMapped: ",

13
include/linux/mmzone.h
View File

@ -209,6 +209,19 @@ enum node_stat_item {
NR_VM_NODE_STAT_ITEMS
};
/*
* Returns true if the item should be printed in THPs (/proc/vmstat
* currently prints number of anon, file and shmem THPs. But the item
* is charged in pages).
*/
static __always_inline bool vmstat_item_print_in_thp(enum node_stat_item item)
{
if (!IS_ENABLED(CONFIG_TRANSPARENT_HUGEPAGE))
return false;
return item == NR_ANON_THPS;
}
/*
* Returns true if the value is measured in bytes (most vmstat values are
* measured in pages). This defines the API part, the internal representation

3
mm/huge_memory.c
View File

@ -2176,7 +2176,8 @@ static void __split_huge_pmd_locked(struct vm_area_struct *vma, pmd_t *pmd,
lock_page_memcg(page);
if (atomic_add_negative(-1, compound_mapcount_ptr(page))) {
/* Last compound_mapcount is gone. */
__dec_lruvec_page_state(page, NR_ANON_THPS);
__mod_lruvec_page_state(page, NR_ANON_THPS,
-HPAGE_PMD_NR);
if (TestClearPageDoubleMap(page)) {
/* No need in mapcount reference anymore */
for (i = 0; i < HPAGE_PMD_NR; i++)

20
mm/memcontrol.c
View File

@ -1533,7 +1533,7 @@ static struct memory_stat memory_stats[] = {
* on some architectures, the macro of HPAGE_PMD_SIZE is not
* constant(e.g. powerpc).
*/
{ "anon_thp", 0, NR_ANON_THPS },
{ "anon_thp", PAGE_SIZE, NR_ANON_THPS },
{ "file_thp", 0, NR_FILE_THPS },
{ "shmem_thp", 0, NR_SHMEM_THPS },
#endif
@ -1566,8 +1566,7 @@ 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 ||
memory_stats[i].idx == NR_FILE_THPS ||
if (memory_stats[i].idx == NR_FILE_THPS ||
memory_stats[i].idx == NR_SHMEM_THPS)
memory_stats[i].ratio = HPAGE_PMD_SIZE;
#endif
@ -4087,10 +4086,6 @@ static int memcg_stat_show(struct seq_file *m, void *v)
if (memcg1_stats[i] == MEMCG_SWAP && !do_memsw_account())
continue;
nr = memcg_page_state_local(memcg, memcg1_stats[i]);
#ifdef CONFIG_TRANSPARENT_HUGEPAGE
if (memcg1_stats[i] == NR_ANON_THPS)
nr *= HPAGE_PMD_NR;
#endif
seq_printf(m, "%s %lu\n", memcg1_stat_names[i], nr * PAGE_SIZE);
}
@ -4121,10 +4116,6 @@ static int memcg_stat_show(struct seq_file *m, void *v)
if (memcg1_stats[i] == MEMCG_SWAP && !do_memsw_account())
continue;
nr = memcg_page_state(memcg, memcg1_stats[i]);
#ifdef CONFIG_TRANSPARENT_HUGEPAGE
if (memcg1_stats[i] == NR_ANON_THPS)
nr *= HPAGE_PMD_NR;
#endif
seq_printf(m, "total_%s %llu\n", memcg1_stat_names[i],
(u64)nr * PAGE_SIZE);
}
@ -5652,10 +5643,11 @@ static int mem_cgroup_move_account(struct page *page,
__mod_lruvec_state(from_vec, NR_ANON_MAPPED, -nr_pages);
__mod_lruvec_state(to_vec, NR_ANON_MAPPED, nr_pages);
if (PageTransHuge(page)) {
__dec_lruvec_state(from_vec, NR_ANON_THPS);
__inc_lruvec_state(to_vec, NR_ANON_THPS);
__mod_lruvec_state(from_vec, NR_ANON_THPS,
-nr_pages);
__mod_lruvec_state(to_vec, NR_ANON_THPS,
nr_pages);
}
}
} else {
__mod_lruvec_state(from_vec, NR_FILE_PAGES, -nr_pages);

2
mm/page_alloc.c
View File

@ -5587,7 +5587,7 @@ void show_free_areas(unsigned int filter, nodemask_t *nodemask)
K(node_page_state(pgdat, NR_SHMEM_THPS) * HPAGE_PMD_NR),
K(node_page_state(pgdat, NR_SHMEM_PMDMAPPED)
* HPAGE_PMD_NR),
K(node_page_state(pgdat, NR_ANON_THPS) * HPAGE_PMD_NR),
K(node_page_state(pgdat, NR_ANON_THPS)),
#endif
K(node_page_state(pgdat, NR_WRITEBACK_TEMP)),
node_page_state(pgdat, NR_KERNEL_STACK_KB),

6
mm/rmap.c
View File

@ -1144,7 +1144,7 @@ void do_page_add_anon_rmap(struct page *page,
* disabled.
*/
if (compound)
__inc_lruvec_page_state(page, NR_ANON_THPS);
__mod_lruvec_page_state(page, NR_ANON_THPS, nr);
__mod_lruvec_page_state(page, NR_ANON_MAPPED, nr);
}
@ -1186,7 +1186,7 @@ void page_add_new_anon_rmap(struct page *page,
if (hpage_pincount_available(page))
atomic_set(compound_pincount_ptr(page), 0);
__inc_lruvec_page_state(page, NR_ANON_THPS);
__mod_lruvec_page_state(page, NR_ANON_THPS, nr);
} else {
/* Anon THP always mapped first with PMD */
VM_BUG_ON_PAGE(PageTransCompound(page), page);
@ -1292,7 +1292,7 @@ static void page_remove_anon_compound_rmap(struct page *page)
if (!IS_ENABLED(CONFIG_TRANSPARENT_HUGEPAGE))
return;
__dec_lruvec_page_state(page, NR_ANON_THPS);
__mod_lruvec_page_state(page, NR_ANON_THPS, -thp_nr_pages(page));
if (TestClearPageDoubleMap(page)) {
/*

11
mm/vmstat.c
View File

@ -1619,8 +1619,12 @@ static void zoneinfo_show_print(struct seq_file *m, pg_data_t *pgdat,
if (is_zone_first_populated(pgdat, zone)) {
seq_printf(m, "\n per-node stats");
for (i = 0; i < NR_VM_NODE_STAT_ITEMS; i++) {
unsigned long pages = node_page_state_pages(pgdat, i);
if (vmstat_item_print_in_thp(i))
pages /= HPAGE_PMD_NR;
seq_printf(m, "\n %-12s %lu", node_stat_name(i),
node_page_state_pages(pgdat, i));
pages);
}
}
seq_printf(m,
@ -1740,8 +1744,11 @@ static void *vmstat_start(struct seq_file *m, loff_t *pos)
v += NR_VM_NUMA_STAT_ITEMS;
#endif
for (i = 0; i < NR_VM_NODE_STAT_ITEMS; i++)
for (i = 0; i < NR_VM_NODE_STAT_ITEMS; i++) {
v[i] = global_node_page_state_pages(i);
if (vmstat_item_print_in_thp(i))
v[i] /= HPAGE_PMD_NR;
}
v += NR_VM_NODE_STAT_ITEMS;
global_dirty_limits(v + NR_DIRTY_BG_THRESHOLD,