Re: [PATCH v4 2/3] kernel/fork.c: get totalram_pages from memblock to calculate max_threads

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On 08.07.24 03:00, Wei Yang wrote:
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 estimated pages from memblock directly.

Signed-off-by: Wei Yang <richard.weiyang@xxxxxxxxx>
CC: Mike Rapoport (IBM) <rppt@xxxxxxxxxx>
CC: David Hildenbrand <david@xxxxxxxxxx>
CC: Oleg Nesterov <oleg@xxxxxxxxxx>
---
  kernel/fork.c | 3 ++-
  1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/kernel/fork.c b/kernel/fork.c
index 99076dbe27d8..e80e889543f3 100644
--- a/kernel/fork.c
+++ b/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(void) { }
  static void set_max_threads(unsigned int max_threads_suggested)
  {
  	u64 threads;
-	unsigned long nr_pages = totalram_pages();
+	unsigned long nr_pages = memblock_estimated_nr_pages();

Stale name

--
Cheers,

David / dhildenb





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