Re: [PATCH v2 2/3] mm: page_counter: rearrange struct page_counter fields
From: Michal Hocko <mhocko@suse.com>
Date: 2022-08-25 06:47:35
Also in:
cgroups, linux-mm, lkml, oe-lkp
On Thu 25-08-22 00:05:05, Shakeel Butt wrote:
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. Signed-off-by: Shakeel Butt <redacted> Reported-by: kernel test robot <redacted> Reviewed-by: Feng Tang <redacted> Acked-by: Soheil Hassas Yeganeh <redacted> Acked-by: Roman Gushchin <roman.gushchin@linux.dev>
Acked-by: Michal Hocko <mhocko@suse.com> One nit below
quoted hunk ↗ jump to hunk
--- Changes since v1: - Updated the commit message - Make struct page_counter cache align. include/linux/page_counter.h | 35 +++++++++++++++++++++++------------ 1 file changed, 23 insertions(+), 12 deletions(-)diff --git a/include/linux/page_counter.h b/include/linux/page_counter.h index 679591301994..78a1c934e416 100644 --- 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;
These two are also touched in the charging path so we could squeeze them into the same cache line as usage. 0-day machinery was quite good at hitting noticeable regression anytime we have changed layout so let's see what they come up with after this patch ;) -- Michal Hocko SUSE Labs