The patch titled
Subject: kernel/fork.c: get totalram_pages from memblock to calculate max_threads
has been added to the -mm mm-unstable branch. Its filename is
kernel-forkc-get-totalram_pages-from-memblock-to-calculate-max_threads.patch
This patch will shortly appear at
https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/kernel-forkc-get-totalram_pages-from-memblock-to-calculate-max_threads.patch
This patch will later appear in the mm-unstable branch at
git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
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------------------------------------------------------
From: Wei Yang <richard.weiyang@xxxxxxxxx>
Subject: kernel/fork.c: get totalram_pages from memblock to calculate max_threads
Date: Mon, 1 Jul 2024 01:34:09 +0000
Since we plan to move the accounting into __free_pages_core(),
totalram_pages may not represent the total usable pages on system at this
point when defer_init is enabled.
Instead we can get the total usable pages from memblock directly.
Link: https://lkml.kernel.org/r/20240701013410.17260-1-richard.weiyang@xxxxxxxxx
Signed-off-by: Wei Yang <richard.weiyang@xxxxxxxxx>
Cc: Mike Rapoport (IBM) <rppt@xxxxxxxxxx>
Cc: David Hildenbrand <david@xxxxxxxxxx>
Cc: Oleg Nesterov <oleg@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
kernel/fork.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
--- a/kernel/fork.c~kernel-forkc-get-totalram_pages-from-memblock-to-calculate-max_threads
+++ a/kernel/fork.c
@@ -44,6 +44,7 @@
#include <linux/fs.h>
#include <linux/mm.h>
#include <linux/mm_inline.h>
+#include <linux/memblock.h>
#include <linux/nsproxy.h>
#include <linux/capability.h>
#include <linux/cpu.h>
@@ -999,7 +1000,7 @@ void __init __weak arch_task_cache_init(
static void set_max_threads(unsigned int max_threads_suggested)
{
u64 threads;
- unsigned long nr_pages = totalram_pages();
+ unsigned long nr_pages = PHYS_PFN(memblock_phys_mem_size() - memblock_reserved_size());
/*
* The number of threads shall be limited such that the thread
_
Patches currently in -mm which might be from richard.weiyang@xxxxxxxxx are
kernel-forkc-get-totalram_pages-from-memblock-to-calculate-max_threads.patch
kernel-forkc-put-set_max_threads-task_struct_whitelist-in-__init-section.patch
