linux-kernel - [PATCH v2 0/3] Fixes for memmap accounting

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Message-ID: <20240807211929.3433304-1-pasha.tatashin@soleen.com>
Date: Wed,  7 Aug 2024 21:19:26 +0000
From: Pasha Tatashin <pasha.tatashin@...een.com>
To: akpm@...ux-foundation.org,
	linux-kernel@...r.kernel.org,
	linux-mm@...ck.org,
	cerasuolodomenico@...il.com,
	hannes@...xchg.org,
	j.granados@...sung.com,
	lizhijian@...itsu.com,
	muchun.song@...ux.dev,
	nphamcs@...il.com,
	pasha.tatashin@...een.com,
	rientjes@...gle.com,
	rppt@...nel.org,
	souravpanda@...gle.com,
	vbabka@...e.cz,
	willy@...radead.org
Subject: [PATCH v2 0/3] Fixes for memmap accounting

Memmap accounting provides us with observability of how much memory is
used for per-page metadata: i.e. "struct page"'s and "struct page_ext".
It also provides with information of how much was allocated using
boot allocator (i.e. not part of MemTotal), and how much was allocated
using buddy allocated (i.e. part of MemTotal).

This small series fixes a few problems that were discovered with the
original patch.

v1: https://lore.kernel.org/all/20240806221454.1971755-1-pasha.tatashin@soleen.com
Changes:
	- Added patch "mm: don't account memmap on failure"
	- Changed from using nid in hot-remove functions to non-pernode
	  system-wide accounting for memmap data.

Pasha Tatashin (3):
  mm: update the memmap stat before page is freed
  mm: don't account memmap on failure
  mm: don't account memmap per node

 include/linux/mmzone.h        |  2 --
 include/linux/vm_event_item.h |  2 ++
 include/linux/vmstat.h        |  7 ++++--
 mm/hugetlb_vmemmap.c          | 13 ++++------
 mm/mm_init.c                  |  3 +--
 mm/page_alloc.c               |  1 -
 mm/page_ext.c                 | 15 ++++--------
 mm/sparse-vmemmap.c           | 11 ++++-----
 mm/sparse.c                   |  5 ++--
 mm/vmstat.c                   | 45 ++++++++++++++++-------------------
 10 files changed, 45 insertions(+), 59 deletions(-)

-- 
2.46.0.76.ge559c4bf1a-goog