linux-kernel - [PATCH RFC v1 0/2] mm, pcp: add high order page info in /proc/zoneinfo

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Message-ID: <20240115093437.87814-1-vernhao@tencent.com>
Date: Mon, 15 Jan 2024 17:34:34 +0800
From: Vern Hao <haoxing990@...il.com>
To: mgorman@...hsingularity.net
Cc: akpm@...ux-foundation.org,
	linux-mm@...ck.org,
	linux-kernel@...r.kernel.org,
	haoxing990@...il.com,
	Xin Hao <vernhao@...cent.com>
Subject: [PATCH RFC v1 0/2] mm, pcp: add high order page info in /proc/zoneinfo

From: Xin Hao <vernhao@...cent.com>

With /proc/zoneinfo we can simply get the number of pages used each cpu,
but we can't get more detailed information about the distribution of
those pages, such as the count of high order pages, through these
patches, we can know the usage of each order page in detail, which will
be helpful for us to analyze the pcp memory usage of application on the
related cpus.

By the way, on my intel 32 cores machine, i found that the 'struct
per_cpu_pages' size increases 64 bytes, it seems like a bad news,
i did some tests like stress-ng, but it did not see any performance
degradation, and maybe use 'pcp->list' is also a possible way to get
high order pages count, but it will increase the /proc/zoneinfo query
time, so any meaningful suggestions are welcome!

Xin Hao (2):
  mm, pcp: rename pcp->count to pcp->total_count
  mm, pcp: add more detail info about high order page count

 include/linux/mmzone.h |  3 ++-
 mm/page_alloc.c        | 46 +++++++++++++++++++++++-------------------
 mm/show_mem.c          |  6 +++---
 mm/vmstat.c            | 22 ++++++++++++--------
 4 files changed, 44 insertions(+), 33 deletions(-)

-- 
2.31.1