mm: page_counter: rearrange struct page_counter fields

With memcg v2 enabled, memcg->memory.usage is a very hot member for the
workloads doing memcg charging on multiple CPUs concurrently.
Particularly the network intensive workloads.  In addition, there is a
false cache sharing between memory.usage and memory.high on the charge
path.  This patch moves the usage into a separate cacheline and move all
the read most fields into separate cacheline.

To evaluate the impact of this optimization, on a 72 CPUs machine, we ran
the following workload in a three level of cgroup hierarchy.

 $ netserver -6
 # 36 instances of netperf with following params
 $ netperf -6 -H ::1 -l 60 -t TCP_SENDFILE -- -m 10K

Results (average throughput of netperf):
Without (6.0-rc1)	10482.7 Mbps
With patch		12413.7 Mbps (18.4% improvement)

With the patch, the throughput improved by 18.4%.

One side-effect of this patch is the increase in the size of struct
mem_cgroup.  For example with this patch on 64 bit build, the size of
struct mem_cgroup increased from 4032 bytes to 4416 bytes.  However for
the performance improvement, this additional size is worth it.  In
addition there are opportunities to reduce the size of struct mem_cgroup
like deprecation of kmem and tcpmem page counters and better packing.

Link: https://lkml.kernel.org/r/20220825000506.239406-3-shakeelb@google.com
Signed-off-by: Shakeel Butt <shakeelb@google.com>
Reported-by: kernel test robot <oliver.sang@intel.com>
Reviewed-by: Feng Tang <feng.tang@intel.com>
Acked-by: Soheil Hassas Yeganeh <soheil@google.com>
Acked-by: Roman Gushchin <roman.gushchin@linux.dev>
Acked-by: Michal Hocko <mhocko@suse.com>
Cc: Eric Dumazet <edumazet@google.com>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: "Michal Koutný" <mkoutny@suse.com>
Cc: Muchun Song <songmuchun@bytedance.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

diff --git a/include/linux/page_counter.h b/include/linux/page_counter.h
index 6795913..78a1c93 100644 (file)
--- a/include/linux/page_counter.h
+++ b/include/linux/page_counter.h
@@ -3,15 +3,26 @@
 #define _LINUX_PAGE_COUNTER_H
 
 #include <linux/atomic.h>
+#include <linux/cache.h>
 #include <linux/kernel.h>
 #include <asm/page.h>
 
+#if defined(CONFIG_SMP)
+struct pc_padding {
+       char x[0];
+} ____cacheline_internodealigned_in_smp;
+#define PC_PADDING(name)       struct pc_padding name
+#else
+#define PC_PADDING(name)
+#endif
+
 struct page_counter {
+       /*
+        * Make sure 'usage' does not share cacheline with any other field. The
+        * memcg->memory.usage is a hot member of struct mem_cgroup.
+        */
        atomic_long_t usage;
-       unsigned long min;
-       unsigned long low;
-       unsigned long high;
-       unsigned long max;
+       PC_PADDING(_pad1_);
 
        /* effective memory.min and memory.min usage tracking */
        unsigned long emin;
@@ -23,18 +34,18 @@ struct page_counter {
        atomic_long_t low_usage;
        atomic_long_t children_low_usage;
 
-       /* legacy */
        unsigned long watermark;
        unsigned long failcnt;
 
-       /*
-        * 'parent' is placed here to be far from 'usage' to reduce
-        * cache false sharing, as 'usage' is written mostly while
-        * parent is frequently read for cgroup's hierarchical
-        * counting nature.
-        */
+       /* Keep all the read most fields in a separete cacheline. */
+       PC_PADDING(_pad2_);
+
+       unsigned long min;
+       unsigned long low;
+       unsigned long high;
+       unsigned long max;
        struct page_counter *parent;
-};
+} ____cacheline_internodealigned_in_smp;
 
 #if BITS_PER_LONG == 32
 #define PAGE_COUNTER_MAX LONG_MAX