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. Now the question is: What to do about it? For some reason shmget is only exposed for Android ARM targets even though it is part of the kernel (system.map) for x86. I see two options: 1. add shmget to SYSCALLS.TXT for x86 and recompile. Remove the hardcoded __NR_shmget from arch-x86.h and put a #error instead to warn others that a kernel patch is necessary for Android x86. 2. use a "blessed" shared memory allocation method for Android targets (like ashmem / mmap??) Not sure how difficult it would be to make this work with the existing FIO architecture. Any other ideas / thoughts / feedback / suggestions are appreciated. Thanks, Jason Akers -- 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
