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kernel/fork.c: get totalram_pages from memblock to calculate max_threads

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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@gmail.com
Signed-off-by: Wei Yang <richard.weiyang@gmail.com>
Cc: Mike Rapoport (IBM) <rppt@kernel.org>
Cc: David Hildenbrand <david@redhat.com>
Cc: Oleg Nesterov <oleg@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Wei Yang 2024-07-01 01:34:09 +00:00 committed by Andrew Morton
parent 3a3b7fec39
commit 66b4aaf733
1 changed files with 2 additions and 1 deletions
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kernel/fork.c
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@ -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(void) { }
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