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| author | Hideo AOKI <haoki@redhat.com> | 2006-04-10 22:53:01 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@g5.osdl.org> | 2006-04-11 06:18:32 -0700 |
| commit | d5ddc79bcaab6975e7671805c3578407dc33b764 (patch) | |
| tree | de29b6d1c43fa6f5a1aca52ad6c2cc6027edc1fc /mm/nommu.c | |
| parent | 6d9f78396583244258080f3369889644c06c37c8 (diff) | |
| download | lwn-d5ddc79bcaab6975e7671805c3578407dc33b764.tar.gz lwn-d5ddc79bcaab6975e7671805c3578407dc33b764.zip | |
[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 <haoki@redhat.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'mm/nommu.c')
| -rw-r--r-- | mm/nommu.c | 18 |
1 files changed, 15 insertions, 3 deletions
diff --git a/mm/nommu.c b/mm/nommu.c index db45efac17cc..029fadac0fb5 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; |