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| author | Davidlohr Bueso <davidlohr@hp.com> | 2014-02-25 15:01:45 -0800 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2014-03-06 21:30:12 -0800 |
| commit | 3079c1e6efde8ecb954214154253b67cbb6f3dd4 (patch) | |
| tree | 8d712e91086c96e5a66099d678291f15b1cadcfc /include | |
| parent | 4480120a6cf3c834cc73431d615bb716be586f2f (diff) | |
| download | linux-stable-3079c1e6efde8ecb954214154253b67cbb6f3dd4.tar.gz linux-stable-3079c1e6efde8ecb954214154253b67cbb6f3dd4.tar.bz2 linux-stable-3079c1e6efde8ecb954214154253b67cbb6f3dd4.zip | |
ipc,mqueue: remove limits for the amount of system-wide queues
commit f3713fd9cff733d9df83116422d8e4af6e86b2bb upstream.
Commit 93e6f119c0ce ("ipc/mqueue: cleanup definition names and
locations") added global hardcoded limits to the amount of message
queues that can be created. While these limits are per-namespace,
reality is that it ends up breaking userspace applications.
Historically users have, at least in theory, been able to create up to
INT_MAX queues, and limiting it to just 1024 is way too low and dramatic
for some workloads and use cases. For instance, Madars reports:
"This update imposes bad limits on our multi-process application. As
our app uses approaches that each process opens its own set of queues
(usually something about 3-5 queues per process). In some scenarios
we might run up to 3000 processes or more (which of-course for linux
is not a problem). Thus we might need up to 9000 queues or more. All
processes run under one user."
Other affected users can be found in launchpad bug #1155695:
https://bugs.launchpad.net/ubuntu/+source/manpages/+bug/1155695
Instead of increasing this limit, revert it entirely and fallback to the
original way of dealing queue limits -- where once a user's resource
limit is reached, and all memory is used, new queues cannot be created.
Signed-off-by: Davidlohr Bueso <davidlohr@hp.com>
Reported-by: Madars Vitolins <m@silodev.com>
Acked-by: Doug Ledford <dledford@redhat.com>
Cc: Manfred Spraul <manfred@colorfullife.com>
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@linuxfoundation.org>
Diffstat (limited to 'include')
| -rw-r--r-- | include/linux/ipc_namespace.h | 2 |
1 files changed, 0 insertions, 2 deletions
diff --git a/include/linux/ipc_namespace.h b/include/linux/ipc_namespace.h index f6c82de12541..d6ad91f26038 100644 --- a/include/linux/ipc_namespace.h +++ b/include/linux/ipc_namespace.h @@ -119,9 +119,7 @@ extern int mq_init_ns(struct ipc_namespace *ns); * the new maximum will handle anyone else. I may have to revisit this * in the future. */ -#define MIN_QUEUESMAX 1 #define DFLT_QUEUESMAX 256 -#define HARD_QUEUESMAX 1024 #define MIN_MSGMAX 1 #define DFLT_MSG 10U #define DFLT_MSGMAX 10 |