On 27 April 2013 03:43, Akers, Jason B <jason.b.akers@xxxxxxxxx> wrote: > Fio hangs when run on the Android x86 emulator. > > Tracking through, I found that the last call made is shmget() (in init.c - setup_thread_area()). > I believe that the hang is related to the fio syscall implementation for x86. > > os-android.h defines shmget as: syscall(__NR_shmget, __key, __size, __shmflg); > > In arch-x86.h __NR_shmget is defined to 29. This was added on April 11th (a415b2cc). > > Looking deeper, I see that syscall 29 is actually mapped to pause(). (see SYSCALLS.TXT in bionic/libc) I confirmed that sys_pause() was being called by using a kernel breakpoint. This explains why fio hangs. You are right, I added the 64bit syscall number. > Now the question is: What to do about it? * Either junk the __NR_shm* definitions, or move them to x86-64 for future 64bit Android compatibility * The shm* functions need different definitions for x86-32, because there are no shm* syscalls. They appear to be multiplexed over an IPC syscall. As Jens said this has nothing to do with Android per se, only that its libc does not implement shm*() so we have to do it ourselves. -- Aaron -- To unsubscribe from this list: send the line "unsubscribe fio" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
