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authorDavide Libenzi <davidel@xmailserver.org>2009-01-29 14:25:26 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2009-01-29 18:04:45 -0800
commit9df04e1f25effde823a600e755b51475d438f56b (patch)
tree57a207adf5e4bfb010000724dc1482e421933be4 /include
parent3095eb87bb36ae880608fe3fc46cfd59ced1f319 (diff)
epoll: drop max_user_instances and rely only on max_user_watches
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> Cc: <stable@kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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 02e16d20730..5a7c7638873 100644
--- a/include/linux/sched.h
+++ b/include/linux/sched.h
@@ -630,7 +630,6 @@ 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