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authorDavide Libenzi <davidel@xmailserver.org>2009-01-29 14:25:26 -0800
committerGreg Kroah-Hartman <gregkh@suse.de>2009-02-02 09:53:26 -0800
commit273140886a6985eb08245334210550b340daa1c3 (patch)
treece40355a5bc0e331d85e7af5c7441d077ddb72bb /include
parentf113ce73199be055550c6ed242f499be208d0b30 (diff)
epoll: drop max_user_instances and rely only on max_user_watches
commit 9df04e1f25effde823a600e755b51475d438f56b upstream. Linus suggested to put limits where the money is, and max_user_watches already does that w/out the need of max_user_instances. That has the advantage to mitigate the potential DoS while allowing pretty generous default behavior. Allowing top 4% of low memory (per user) to be allocated in epoll watches, we have: LOMEM MAX_WATCHES (per user) 512MB ~178000 1GB ~356000 2GB ~712000 A box with 512MB of lomem, will meet some challenge in hitting 180K watches, socket buffers math teaches us. No more max_user_instances limits then. Signed-off-by: Davide Libenzi <davidel@xmailserver.org> Cc: Willy Tarreau <w@1wt.eu> Cc: Michael Kerrisk <mtk.manpages@googlemail.com> Cc: Bron Gondwana <brong@fastmail.fm> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'include')
-rw-r--r--include/linux/sched.h1
1 files changed, 0 insertions, 1 deletions
diff --git a/include/linux/sched.h b/include/linux/sched.h
index 55e30d114477..3883c32697a8 100644
--- a/include/linux/sched.h
+++ b/include/linux/sched.h
@@ -631,7 +631,6 @@ struct user_struct {
atomic_t inotify_devs; /* How many inotify devs does this user have opened? */
#endif
#ifdef CONFIG_EPOLL
- atomic_t epoll_devs; /* The number of epoll descriptors currently open */
atomic_t epoll_watches; /* The number of file descriptors currently watched */
#endif
#ifdef CONFIG_POSIX_MQUEUE