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authorMuchun Song <songmuchun@bytedance.com>2020-10-14 02:52:59 +0300
committerLinus Torvalds <torvalds@linux-foundation.org>2020-10-14 04:38:30 +0300
commit5f9a4f4a709608fc15197368464a6c8ed4e3630a (patch)
tree31760cbaffd861f4e38b84e0bf8c614c5a277bfe /Documentation/admin-guide
parentbd0b230fe14554bfffbae54e19038716f96f5a41 (diff)
downloadlinux-5f9a4f4a709608fc15197368464a6c8ed4e3630a.tar.xz
mm: memcontrol: add the missing numa_stat interface for cgroup v2
In the cgroup v1, we have a numa_stat interface. This is useful for providing visibility into the numa locality information within an memcg since the pages are allowed to be allocated from any physical node. One of the use cases is evaluating application performance by combining this information with the application's CPU allocation. But the cgroup v2 does not. So this patch adds the missing information. Suggested-by: Shakeel Butt <shakeelb@google.com> Signed-off-by: Muchun Song <songmuchun@bytedance.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Reviewed-by: Shakeel Butt <shakeelb@google.com> Cc: Zefan Li <lizefan@huawei.com> Cc: Johannes Weiner <hannes@cmpxchg.org> Cc: Jonathan Corbet <corbet@lwn.net> Cc: Michal Hocko <mhocko@kernel.org> Cc: Vladimir Davydov <vdavydov.dev@gmail.com> Cc: Roman Gushchin <guro@fb.com> Cc: Randy Dunlap <rdunlap@infradead.org> Link: https://lkml.kernel.org/r/20200916100030.71698-2-songmuchun@bytedance.com Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'Documentation/admin-guide')
-rw-r--r--Documentation/admin-guide/cgroup-v2.rst69
1 files changed, 49 insertions, 20 deletions
diff --git a/Documentation/admin-guide/cgroup-v2.rst b/Documentation/admin-guide/cgroup-v2.rst
index baa07b30845e..608d7c279396 100644
--- a/Documentation/admin-guide/cgroup-v2.rst
+++ b/Documentation/admin-guide/cgroup-v2.rst
@@ -1259,6 +1259,10 @@ PAGE_SIZE multiple when read back.
can show up in the middle. Don't rely on items remaining in a
fixed position; use the keys to look up specific values!
+ If the entry has no per-node counter(or not show in the
+ mempry.numa_stat). We use 'npn'(non-per-node) as the tag
+ to indicate that it will not show in the mempry.numa_stat.
+
anon
Amount of memory used in anonymous mappings such as
brk(), sbrk(), and mmap(MAP_ANONYMOUS)
@@ -1270,15 +1274,11 @@ PAGE_SIZE multiple when read back.
kernel_stack
Amount of memory allocated to kernel stacks.
- slab
- Amount of memory used for storing in-kernel data
- structures.
-
- percpu
+ percpu(npn)
Amount of memory used for storing per-cpu kernel
data structures.
- sock
+ sock(npn)
Amount of memory used in network transmission buffers
shmem
@@ -1318,11 +1318,9 @@ PAGE_SIZE multiple when read back.
Part of "slab" that cannot be reclaimed on memory
pressure.
- pgfault
- Total number of page faults incurred
-
- pgmajfault
- Number of major page faults incurred
+ slab(npn)
+ Amount of memory used for storing in-kernel data
+ structures.
workingset_refault_anon
Number of refaults of previously evicted anonymous pages.
@@ -1348,37 +1346,68 @@ PAGE_SIZE multiple when read back.
workingset_nodereclaim
Number of times a shadow node has been reclaimed
- pgrefill
+ pgfault(npn)
+ Total number of page faults incurred
+
+ pgmajfault(npn)
+ Number of major page faults incurred
+
+ pgrefill(npn)
Amount of scanned pages (in an active LRU list)
- pgscan
+ pgscan(npn)
Amount of scanned pages (in an inactive LRU list)
- pgsteal
+ pgsteal(npn)
Amount of reclaimed pages
- pgactivate
+ pgactivate(npn)
Amount of pages moved to the active LRU list
- pgdeactivate
+ pgdeactivate(npn)
Amount of pages moved to the inactive LRU list
- pglazyfree
+ pglazyfree(npn)
Amount of pages postponed to be freed under memory pressure
- pglazyfreed
+ pglazyfreed(npn)
Amount of reclaimed lazyfree pages
- thp_fault_alloc
+ thp_fault_alloc(npn)
Number of transparent hugepages which were allocated to satisfy
a page fault. This counter is not present when CONFIG_TRANSPARENT_HUGEPAGE
is not set.
- thp_collapse_alloc
+ thp_collapse_alloc(npn)
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.numa_stat
+ A read-only nested-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
+ per node on the state of the memory management system.
+
+ This is useful for providing visibility into the NUMA locality
+ information within an memcg since the pages are allowed to be
+ allocated from any physical node. One of the use case is evaluating
+ application performance by combining this information with the
+ application's CPU allocation.
+
+ All memory amounts are in bytes.
+
+ The output format of memory.numa_stat is::
+
+ type N0=<bytes in node 0> N1=<bytes in node 1> ...
+
+ 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!
+
+ The entries can refer to the memory.stat.
+
memory.swap.current
A read-only single value file which exists on non-root
cgroups.