The patch titled
Subject: mm: vmstat: add some comments on internal storage of byte items
has been added to the -mm tree. Its filename is
mm-vmstat-add-some-comments-on-internal-storage-of-byte-items.patch
This patch should soon appear at
https://ozlabs.org/~akpm/mmots/broken-out/mm-vmstat-add-some-comments-on-internal-storage-of-byte-items.patch
and later at
https://ozlabs.org/~akpm/mmotm/broken-out/mm-vmstat-add-some-comments-on-internal-storage-of-byte-items.patch
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------------------------------------------------------
From: Johannes Weiner <hannes@xxxxxxxxxxx>
Subject: mm: vmstat: add some comments on internal storage of byte items
Byte-accounted items are used for slab object accounting at the cgroup
level, because the objects in a slab page can belong to different cgroups.
At the global level these items always change in multiples of whole slab
pages. The vmstat code exploits this and stores these items as pages
internally, which allows for more compact per-cpu data.
This optimization isn't self-evident from the asserts and the division in
the stat update functions. Provide the reader with some context.
Link: https://lkml.kernel.org/r/20210202184411.118614-1-hannes@xxxxxxxxxxx
Signed-off-by: Johannes Weiner <hannes@xxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
include/linux/vmstat.h | 6 ++++++
mm/vmstat.c | 12 ++++++++++++
2 files changed, 18 insertions(+)
--- a/include/linux/vmstat.h~mm-vmstat-add-some-comments-on-internal-storage-of-byte-items
+++ a/include/linux/vmstat.h
@@ -313,6 +313,12 @@ static inline void __mod_node_page_state
enum node_stat_item item, int delta)
{
if (vmstat_item_in_bytes(item)) {
+ /*
+ * Only cgroups use subpage accounting right now; at
+ * the global level, these items still change in
+ * multiples of whole pages. Store them as pages
+ * internally to keep the per-cpu counters compact.
+ */
VM_WARN_ON_ONCE(delta & (PAGE_SIZE - 1));
delta >>= PAGE_SHIFT;
}
--- a/mm/vmstat.c~mm-vmstat-add-some-comments-on-internal-storage-of-byte-items
+++ a/mm/vmstat.c
@@ -342,6 +342,12 @@ void __mod_node_page_state(struct pglist
long t;
if (vmstat_item_in_bytes(item)) {
+ /*
+ * Only cgroups use subpage accounting right now; at
+ * the global level, these items still change in
+ * multiples of whole pages. Store them as pages
+ * internally to keep the per-cpu counters compact.
+ */
VM_WARN_ON_ONCE(delta & (PAGE_SIZE - 1));
delta >>= PAGE_SHIFT;
}
@@ -551,6 +557,12 @@ static inline void mod_node_state(struct
long o, n, t, z;
if (vmstat_item_in_bytes(item)) {
+ /*
+ * Only cgroups use subpage accounting right now; at
+ * the global level, these items still change in
+ * multiples of whole pages. Store them as pages
+ * internally to keep the per-cpu counters compact.
+ */
VM_WARN_ON_ONCE(delta & (PAGE_SIZE - 1));
delta >>= PAGE_SHIFT;
}
_
Patches currently in -mm which might be from hannes@xxxxxxxxxxx are
revert-mm-memcontrol-avoid-workload-stalls-when-lowering-memoryhigh.patch
mm-vmstat-fix-nohz-wakeups-for-node-stat-changes.patch
mm-vmstat-add-some-comments-on-internal-storage-of-byte-items.patch
