Hi Seiichi, On 08/03/2012 02:49 PM, Seiichi Ikarashi wrote: > semop() with SEM_UNDO sem_flg can result in ENOMEM even after > succeeding semget() with large nsems. How large is nsems, what is the use case? Which kind of operations are performed? Only simple semop(,,1) calls?
<linux/sem.h> still documents ~8000 as the upper limit, I'm not sure if there are other codepaths that might fail as well. If all are fixed, then the documentation should be updated as well. > This is because > semop() uses kzalloc() via find_alloc_undo() though > semget() uses vmalloc() via ipc_rcu_alloc(). > This patch makes semop() be able to use vmalloc() via ipc_alloc(). > > Signed-off-by: Seiichi Ikarashi <s.ikara...@jp.fujitsu.com> -- Manfred -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/