From d5ddc79bcaab6975e7671805c3578407dc33b764 Mon Sep 17 00:00:00 2001 From: Hideo AOKI Date: Mon, 10 Apr 2006 22:53:01 -0700 Subject: [PATCH] [PATCH] overcommit: use totalreserve_pages for nommu This patch is an enhancement of OVERCOMMIT_GUESS algorithm in __vm_enough_memory() in mm/nommu.c. When the OVERCOMMIT_GUESS algorithm calculates the number of free pages, the algorithm subtracts the number of reserved pages from the result nr_free_pages(). Signed-off-by: Hideo Aoki Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- mm/nommu.c | 18 +++++++++++++++--- 1 file changed, 15 insertions(+), 3 deletions(-) diff --git a/mm/nommu.c b/mm/nommu.c index db45efa..029fada 100644 --- a/mm/nommu.c +++ b/mm/nommu.c @@ -1147,14 +1147,26 @@ int __vm_enough_memory(long pages, int cap_sys_admin) * only call if we're about to fail. */ n = nr_free_pages(); + + /* + * Leave reserved pages. The pages are not for anonymous pages. + */ + if (n <= totalreserve_pages) + goto error; + else + n -= totalreserve_pages; + + /* + * Leave the last 3% for root + */ if (!cap_sys_admin) n -= n / 32; free += n; if (free > pages) return 0; - vm_unacct_memory(pages); - return -ENOMEM; + + goto error; } allowed = totalram_pages * sysctl_overcommit_ratio / 100; @@ -1175,7 +1187,7 @@ int __vm_enough_memory(long pages, int cap_sys_admin) */ if (atomic_read(&vm_committed_space) < (long)allowed) return 0; - +error: vm_unacct_memory(pages); return -ENOMEM; -- 2.7.4