问RHEL 5 (Linux内核2.6.18)如何确定默认的fs.file-max设置？

EN

 488 void __init files_init(unsigned long mempages)
 489 { 
 490         int n; 
 491 
 492         filp_cachep = kmem_cache_create("filp", sizeof(struct file), 0,
 493                         SLAB_HWCACHE_ALIGN | SLAB_PANIC, NULL);
 494 
 495         /*
 496          * One file with associated inode and dcache is very roughly 1K.
 497          * Per default don't use more than 10% of our memory for files. 
 498          */ 
 499 
 500         n = (mempages * (PAGE_SIZE / 1024)) / 10;
 501         files_stat.max_files = n; 
 502         if (files_stat.max_files < NR_FILE)
 503                 files_stat.max_files = NR_FILE;
 504         files_defer_init();
 505         lg_lock_init(files_lglock);
 506         percpu_counter_init(&nr_files, 0);
 507 }