On Thu, Oct 29, 2015 at 7:23 AM, Anton Ivanov <anton.iva...@kot-begemot.co.uk> wrote: > I got the first patchset to build, it works very well on a single core > host or with CPU pinning of the UML - the performance gain is > 25%. > > However, I introduced a race somewhere along the way - it crashes UML > reliably if you do not pin CPUs.
How does the crash look like? I see also an issue with that patch, after UML has an uptime of a few minutes a task which does nanosleep() will never wake up. [<000000006001a29d>] __switch_to+0x53/0x82 [<00000000602995d2>] __schedule+0x2f4/0x3f7 [<0000000060299751>] schedule+0x7c/0x95 [<000000006029b871>] do_nanosleep+0x8b/0x134 [<0000000060068a41>] hrtimer_nanosleep+0xb2/0x15a [<0000000060068b90>] SyS_nanosleep+0xa7/0xbf [<000000006001d492>] handle_syscall+0x6a/0x84 [<00000000600304a8>] userspace+0x3d8/0x463 [<000000006001a180>] fork_handler+0x85/0x87 [<ffffffffffffffff>] 0xffffffffffffffff -- Thanks, //richard ------------------------------------------------------------------------------ _______________________________________________ User-mode-linux-devel mailing list User-mode-linux-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/user-mode-linux-devel
