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 Before you just go and hit "reply", please: a) Consider who else should be cc'ed b) Prefer to cc a suitable mailing list as well c) Ideally: find the original patch on the mailing list and do a reply-to-all to that, adding suitable additional cc's *** Remember to use Documentation/SubmitChecklist when testing your code *** The -mm tree is included into linux-next and is updated there every 3-4 working days ------------------------------------------------------ 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 -- To unsubscribe from this list: send the line "unsubscribe mm-commits" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html