The patch titled
Subject: mm: don't account memmap on failure
has been added to the -mm mm-hotfixes-unstable branch. Its filename is
mm-dont-account-memmap-on-failure.patch
This patch will shortly appear at
https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/mm-dont-account-memmap-on-failure.patch
This patch will later appear in the mm-hotfixes-unstable branch at
git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
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------------------------------------------------------
From: Pasha Tatashin <pasha.tatashin@xxxxxxxxxx>
Subject: mm: don't account memmap on failure
Date: Thu, 8 Aug 2024 21:34:34 +0000
Patch series "Fixes for memmap accounting", v4.
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.
This patch (of 3):
When we fail to allocate the mmemmap in alloc_vmemmap_page_list(), do not
account any already-allocated pages: we're going to free all them before
we return from the function.
Link: https://lkml.kernel.org/r/20240808213437.682006-1-pasha.tatashin@xxxxxxxxxx
Link: https://lkml.kernel.org/r/20240808213437.682006-2-pasha.tatashin@xxxxxxxxxx
Fixes: 15995a352474 ("mm: report per-page metadata information")
Signed-off-by: Pasha Tatashin <pasha.tatashin@xxxxxxxxxx>
Reviewed-by: Fan Ni <fan.ni@xxxxxxxxxxx>
Reviewed-by: Yosry Ahmed <yosryahmed@xxxxxxxxxx>
Acked-by: David Hildenbrand <david@xxxxxxxxxx>
Cc: Alison Schofield <alison.schofield@xxxxxxxxx>
Cc: Dan Williams <dan.j.williams@xxxxxxxxx>
Cc: David Rientjes <rientjes@xxxxxxxxxx>
Cc: Domenico Cerasuolo <cerasuolodomenico@xxxxxxxxx>
Cc: Joel Granados <j.granados@xxxxxxxxxxx>
Cc: Johannes Weiner <hannes@xxxxxxxxxxx>
Cc: Li Zhijian <lizhijian@xxxxxxxxxxx>
Cc: Matthew Wilcox (Oracle) <willy@xxxxxxxxxxxxx>
Cc: Mike Rapoport <rppt@xxxxxxxxxx>
Cc: Muchun Song <muchun.song@xxxxxxxxx>
Cc: Nhat Pham <nphamcs@xxxxxxxxx>
Cc: Sourav Panda <souravpanda@xxxxxxxxxx>
Cc: Vlastimil Babka <vbabka@xxxxxxx>
Cc: Yi Zhang <yi.zhang@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/hugetlb_vmemmap.c | 5 +----
1 file changed, 1 insertion(+), 4 deletions(-)
--- a/mm/hugetlb_vmemmap.c~mm-dont-account-memmap-on-failure
+++ a/mm/hugetlb_vmemmap.c
@@ -392,13 +392,10 @@ static int alloc_vmemmap_page_list(unsig
for (i = 0; i < nr_pages; i++) {
page = alloc_pages_node(nid, gfp_mask, 0);
- if (!page) {
- mod_node_page_state(NODE_DATA(nid), NR_MEMMAP, i);
+ if (!page)
goto out;
- }
list_add(&page->lru, list);
}
-
mod_node_page_state(NODE_DATA(nid), NR_MEMMAP, nr_pages);
return 0;
_
Patches currently in -mm which might be from pasha.tatashin@xxxxxxxxxx are
mm-dont-account-memmap-on-failure.patch
mm-add-system-wide-stats-items-category.patch
mm-dont-account-memmap-per-node.patch
memcg-increase-the-valid-index-range-for-memcg-stats-v5.patch
vmstat-kernel-stack-usage-histogram.patch
task_stack-uninline-stack_not_used.patch
