The patch titled
Subject: mm: memcontrol: basic memory statistics in cgroup2 memory controller
has been removed from the -mm tree. Its filename was
mm-memcontrol-basic-memory-statistics-in-cgroup2-memory-controller.patch
This patch was dropped because it was merged into mainline or a subsystem tree
------------------------------------------------------
From: Johannes Weiner <hannes@xxxxxxxxxxx>
Subject: mm: memcontrol: basic memory statistics in cgroup2 memory controller
Provide a cgroup2 memory.stat that provides statistics on LRU memory
and fault event counters. More consumers and breakdowns will follow.
Signed-off-by: Johannes Weiner <hannes@xxxxxxxxxxx>
Acked-by: Vladimir Davydov <vdavydov@xxxxxxxxxxxxx>
Cc: Michal Hocko <mhocko@xxxxxxx>
Cc: Tejun Heo <tj@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
Documentation/cgroup-v2.txt | 56 ++++++++++++++++++++++++++++
mm/memcontrol.c | 68 ++++++++++++++++++++++++++++++++++
2 files changed, 124 insertions(+)
diff -puN Documentation/cgroup-v2.txt~mm-memcontrol-basic-memory-statistics-in-cgroup2-memory-controller Documentation/cgroup-v2.txt
--- a/Documentation/cgroup-v2.txt~mm-memcontrol-basic-memory-statistics-in-cgroup2-memory-controller
+++ a/Documentation/cgroup-v2.txt
@@ -819,6 +819,62 @@ PAGE_SIZE multiple when read back.
the cgroup. This may not exactly match the number of
processes killed but should generally be close.
+ memory.stat
+
+ A read-only flat-keyed file which exists on non-root cgroups.
+
+ This breaks down the cgroup's memory footprint into different
+ types of memory, type-specific details, and other information
+ on the state and past events of the memory management system.
+
+ All memory amounts are in bytes.
+
+ The entries are ordered to be human readable, and new entries
+ can show up in the middle. Don't rely on items remaining in a
+ fixed position; use the keys to look up specific values!
+
+ anon
+
+ Amount of memory used in anonymous mappings such as
+ brk(), sbrk(), and mmap(MAP_ANONYMOUS)
+
+ file
+
+ Amount of memory used to cache filesystem data,
+ including tmpfs and shared memory.
+
+ file_mapped
+
+ Amount of cached filesystem data mapped with mmap()
+
+ file_dirty
+
+ Amount of cached filesystem data that was modified but
+ not yet written back to disk
+
+ file_writeback
+
+ Amount of cached filesystem data that was modified and
+ is currently being written back to disk
+
+ 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
+ page reclaim algorithm
+
+ pgfault
+
+ Total number of page faults incurred
+
+ pgmajfault
+
+ Number of major page faults incurred
+
memory.swap.current
A read-only single value file which exists on non-root
diff -puN mm/memcontrol.c~mm-memcontrol-basic-memory-statistics-in-cgroup2-memory-controller mm/memcontrol.c
--- a/mm/memcontrol.c~mm-memcontrol-basic-memory-statistics-in-cgroup2-memory-controller
+++ a/mm/memcontrol.c
@@ -2767,6 +2767,18 @@ static unsigned long tree_stat(struct me
return val;
}
+static unsigned long tree_events(struct mem_cgroup *memcg,
+ enum mem_cgroup_events_index idx)
+{
+ struct mem_cgroup *iter;
+ unsigned long val = 0;
+
+ for_each_mem_cgroup_tree(iter, memcg)
+ val += mem_cgroup_read_events(iter, idx);
+
+ return val;
+}
+
static unsigned long mem_cgroup_usage(struct mem_cgroup *memcg, bool swap)
{
unsigned long val;
@@ -5096,6 +5108,57 @@ static int memory_events_show(struct seq
return 0;
}
+static int memory_stat_show(struct seq_file *m, void *v)
+{
+ struct mem_cgroup *memcg = mem_cgroup_from_css(seq_css(m));
+ int i;
+
+ /*
+ * Provide statistics on the state of the memory subsystem as
+ * well as cumulative event counters that show past behavior.
+ *
+ * This list is ordered following a combination of these gradients:
+ * 1) generic big picture -> specifics and details
+ * 2) reflecting userspace activity -> reflecting kernel heuristics
+ *
+ * Current memory state:
+ */
+
+ seq_printf(m, "anon %llu\n",
+ (u64)tree_stat(memcg, MEM_CGROUP_STAT_RSS) * PAGE_SIZE);
+ seq_printf(m, "file %llu\n",
+ (u64)tree_stat(memcg, MEM_CGROUP_STAT_CACHE) * PAGE_SIZE);
+
+ seq_printf(m, "file_mapped %llu\n",
+ (u64)tree_stat(memcg, MEM_CGROUP_STAT_FILE_MAPPED) *
+ PAGE_SIZE);
+ seq_printf(m, "file_dirty %llu\n",
+ (u64)tree_stat(memcg, MEM_CGROUP_STAT_DIRTY) *
+ PAGE_SIZE);
+ seq_printf(m, "file_writeback %llu\n",
+ (u64)tree_stat(memcg, MEM_CGROUP_STAT_WRITEBACK) *
+ PAGE_SIZE);
+
+ for (i = 0; i < NR_LRU_LISTS; i++) {
+ struct mem_cgroup *mi;
+ unsigned long val = 0;
+
+ for_each_mem_cgroup_tree(mi, memcg)
+ val += mem_cgroup_nr_lru_pages(mi, BIT(i));
+ seq_printf(m, "%s %llu\n",
+ mem_cgroup_lru_names[i], (u64)val * PAGE_SIZE);
+ }
+
+ /* Accumulated memory events */
+
+ seq_printf(m, "pgfault %lu\n",
+ tree_events(memcg, MEM_CGROUP_EVENTS_PGFAULT));
+ seq_printf(m, "pgmajfault %lu\n",
+ tree_events(memcg, MEM_CGROUP_EVENTS_PGMAJFAULT));
+
+ return 0;
+}
+
static struct cftype memory_files[] = {
{
.name = "current",
@@ -5126,6 +5189,11 @@ static struct cftype memory_files[] = {
.file_offset = offsetof(struct mem_cgroup, events_file),
.seq_show = memory_events_show,
},
+ {
+ .name = "stat",
+ .flags = CFTYPE_NOT_ON_ROOT,
+ .seq_show = memory_stat_show,
+ },
{ } /* terminate */
};
_
Patches currently in -mm which might be from hannes@xxxxxxxxxxx are
proc-revert-proc-pid-maps-annotation.patch
mm-oom_killc-dont-skip-pf_exiting-tasks-when-searching-for-a-victim.patch
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