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authorChris Down <chris@chrisdown.name>2019-03-05 15:48:09 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2019-03-05 21:07:19 -0800
commit1ff9e6e1798c7670ea6a7680a1ad5582df2fa914 (patch)
tree6050ceb4029e34bd694454533bb81d02b5afa9c9
parent2bb0f34fe3c1f04196cbcf8aa86b0a9371f6938d (diff)
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mm: memcontrol: expose THP events on a per-memcg basis
Currently THP allocation events data is fairly opaque, since you can only get it system-wide. This patch makes it easier to reason about transparent hugepage behaviour on a per-memcg basis. For anonymous THP-backed pages, we already have MEMCG_RSS_HUGE in v1, which is used for v1's rss_huge [sic]. This is reused here as it's fairly involved to untangle NR_ANON_THPS right now to make it per-memcg, since right now some of this is delegated to rmap before we have any memcg actually assigned to the page. It's a good idea to rework that, but let's leave untangling THP allocation for a future patch. [akpm@linux-foundation.org: fix build] [chris@chrisdown.name: fix memcontrol build when THP is disabled] Link: http://lkml.kernel.org/r/20190131160802.GA5777@chrisdown.name Link: http://lkml.kernel.org/r/20190129205852.GA7310@chrisdown.name Signed-off-by: Chris Down <chris@chrisdown.name> Acked-by: Johannes Weiner <hannes@cmpxchg.org> Cc: Tejun Heo <tj@kernel.org> Cc: Roman Gushchin <guro@fb.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
-rw-r--r--Documentation/admin-guide/cgroup-v2.rst16
-rw-r--r--mm/huge_memory.c2
-rw-r--r--mm/khugepaged.c2
-rw-r--r--mm/memcontrol.c16
4 files changed, 36 insertions, 0 deletions
diff --git a/Documentation/admin-guide/cgroup-v2.rst b/Documentation/admin-guide/cgroup-v2.rst
index 7bf3f129c68b..53d3288c328b 100644
--- a/Documentation/admin-guide/cgroup-v2.rst
+++ b/Documentation/admin-guide/cgroup-v2.rst
@@ -1189,6 +1189,10 @@ PAGE_SIZE multiple when read back.
Amount of cached filesystem data that was modified and
is currently being written back to disk
+ anon_thp
+ Amount of memory used in anonymous mappings 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
@@ -1248,6 +1252,18 @@ PAGE_SIZE multiple when read back.
Amount of reclaimed lazyfree pages
+ thp_fault_alloc
+
+ Number of transparent hugepages which were allocated to satisfy
+ a page fault, including COW faults. This counter is not present
+ when CONFIG_TRANSPARENT_HUGEPAGE is not set.
+
+ thp_collapse_alloc
+
+ Number of transparent hugepages which were allocated to allow
+ collapsing an existing range of pages. This counter is not
+ present when CONFIG_TRANSPARENT_HUGEPAGE is not set.
+
memory.swap.current
A read-only single value file which exists on non-root
cgroups.
diff --git a/mm/huge_memory.c b/mm/huge_memory.c
index af07527cd971..d4847026d4b1 100644
--- a/mm/huge_memory.c
+++ b/mm/huge_memory.c
@@ -617,6 +617,7 @@ static vm_fault_t __do_huge_pmd_anonymous_page(struct vm_fault *vmf,
mm_inc_nr_ptes(vma->vm_mm);
spin_unlock(vmf->ptl);
count_vm_event(THP_FAULT_ALLOC);
+ count_memcg_events(memcg, THP_FAULT_ALLOC, 1);
}
return 0;
@@ -1338,6 +1339,7 @@ alloc:
}
count_vm_event(THP_FAULT_ALLOC);
+ count_memcg_events(memcg, THP_FAULT_ALLOC, 1);
if (!page)
clear_huge_page(new_page, vmf->address, HPAGE_PMD_NR);
diff --git a/mm/khugepaged.c b/mm/khugepaged.c
index 4f017339ddb2..449044378782 100644
--- a/mm/khugepaged.c
+++ b/mm/khugepaged.c
@@ -1074,6 +1074,7 @@ static void collapse_huge_page(struct mm_struct *mm,
BUG_ON(!pmd_none(*pmd));
page_add_new_anon_rmap(new_page, vma, address, true);
mem_cgroup_commit_charge(new_page, memcg, false, true);
+ count_memcg_events(memcg, THP_COLLAPSE_ALLOC, 1);
lru_cache_add_active_or_unevictable(new_page, vma);
pgtable_trans_huge_deposit(mm, pmd, pgtable);
set_pmd_at(mm, address, pmd, _pmd);
@@ -1502,6 +1503,7 @@ xa_unlocked:
page_ref_add(new_page, HPAGE_PMD_NR - 1);
set_page_dirty(new_page);
mem_cgroup_commit_charge(new_page, memcg, false, true);
+ count_memcg_events(memcg, THP_COLLAPSE_ALLOC, 1);
lru_cache_add_anon(new_page);
/*
diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index 1eca627566ff..30bda8d7fb5c 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -39,6 +39,7 @@
#include <linux/shmem_fs.h>
#include <linux/hugetlb.h>
#include <linux/pagemap.h>
+#include <linux/vm_event_item.h>
#include <linux/smp.h>
#include <linux/page-flags.h>
#include <linux/backing-dev.h>
@@ -5571,6 +5572,15 @@ static int memory_stat_show(struct seq_file *m, void *v)
seq_printf(m, "file_writeback %llu\n",
(u64)acc.stat[NR_WRITEBACK] * PAGE_SIZE);
+ /*
+ * TODO: We should eventually replace our own MEMCG_RSS_HUGE counter
+ * with the NR_ANON_THP vm counter, but right now it's a pain in the
+ * arse because it requires migrating the work out of rmap to a place
+ * where the page->mem_cgroup is set up and stable.
+ */
+ seq_printf(m, "anon_thp %llu\n",
+ (u64)acc.stat[MEMCG_RSS_HUGE] * PAGE_SIZE);
+
for (i = 0; i < NR_LRU_LISTS; i++)
seq_printf(m, "%s %llu\n", mem_cgroup_lru_names[i],
(u64)acc.lru_pages[i] * PAGE_SIZE);
@@ -5602,6 +5612,12 @@ static int memory_stat_show(struct seq_file *m, void *v)
seq_printf(m, "pglazyfree %lu\n", acc.events[PGLAZYFREE]);
seq_printf(m, "pglazyfreed %lu\n", acc.events[PGLAZYFREED]);
+#ifdef CONFIG_TRANSPARENT_HUGEPAGE
+ seq_printf(m, "thp_fault_alloc %lu\n", acc.events[THP_FAULT_ALLOC]);
+ seq_printf(m, "thp_collapse_alloc %lu\n",
+ acc.events[THP_COLLAPSE_ALLOC]);
+#endif /* CONFIG_TRANSPARENT_HUGEPAGE */
+
return 0;
}