fs: Make file-nr output the total allocated file handles

Make file-nr output the total allocated file handles, not per-cpu
cache number, it's more precise, and not in hot path

Signed-off-by: Li RongQing <lirongqing@baidu.com>
Link: https://lore.kernel.org/20250410112117.2851-1-lirongqing@baidu.com
Signed-off-by: Christian Brauner <brauner@kernel.org>

diff --git a/fs/file_table.c b/fs/file_table.c
index c04ed94cdc4b26daa8fa52efa2cc3bdb932e6de1..138114d643077118948b4902cffb933ff7ee901e 100644 (file)
--- a/fs/file_table.c
+++ b/fs/file_table.c
@@ -102,7 +102,7 @@ EXPORT_SYMBOL_GPL(get_max_files);
 static int proc_nr_files(const struct ctl_table *table, int write, void *buffer,
                         size_t *lenp, loff_t *ppos)
 {
-       files_stat.nr_files = get_nr_files();
+       files_stat.nr_files = percpu_counter_sum_positive(&nr_files);
        return proc_doulongvec_minmax(table, write, buffer, lenp, ppos);
 }