> Tracing the aio_read() through the UML kernel finally gets me here:
> 
> #0  sys_pread64 (fd=3, buf=0xbf7c8f20 "", count=1024, pos=0)
>   at fs/read_write.c:354
> #1  0x08062ff8 in execute_syscall_skas (r=0x12374864)
>   at arch/um/kernel/skas/syscall_kern.c:29

Finally?  That's the very beginning of the system call (or the very end).

The UML block device doesn't know about AIO.  All it does is get blocks from
a disk.

Are you sure you're getting kernel AIO and not the libc emulation of it?

                                Jeff


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