The patch titled
Subject: ipc: sysv shared memory limited to 8TiB
has been added to the -mm tree. Its filename is
ipc-sysv-shared-memory-limited-to-8tib.patch
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------------------------------------------------------
From: Robin Holt <holt@xxxxxxx>
Subject: ipc: sysv shared memory limited to 8TiB
Trying to run an application which was trying to put data into half of
memory using shmget(), we found that having a shmall value below 8EiB-8TiB
would prevent us from using anything more than 8TiB. By setting
kernel.shmall greater than 8EiB-8TiB would make the job work.
In the newseg() function, ns->shm_tot which, at 8TiB is INT_MAX.
ipc/shm.c:
458 static int newseg(struct ipc_namespace *ns, struct ipc_params *params)
459 {
...
465 int numpages = (size + PAGE_SIZE -1) >> PAGE_SHIFT;
...
474 if (ns->shm_tot + numpages > ns->shm_ctlall)
475 return -ENOSPC;
Signed-off-by: Robin Holt <holt@xxxxxxx>
Reported-by: Alex Thorlton <athorlton@xxxxxxx>
Cc: <stable@xxxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
include/linux/ipc_namespace.h | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff -puN include/linux/ipc_namespace.h~ipc-sysv-shared-memory-limited-to-8tib include/linux/ipc_namespace.h
--- a/include/linux/ipc_namespace.h~ipc-sysv-shared-memory-limited-to-8tib
+++ a/include/linux/ipc_namespace.h
@@ -43,8 +43,8 @@ struct ipc_namespace {
size_t shm_ctlmax;
size_t shm_ctlall;
+ unsigned long shm_tot;
int shm_ctlmni;
- int shm_tot;
/*
* Defines whether IPC_RMID is forced for _all_ shm segments regardless
* of shmctl()
_
Patches currently in -mm which might be from holt@xxxxxxx are
ipc-sysv-shared-memory-limited-to-8tib.patch
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