* Yuanhan Liu <[email protected]> wrote: > On Thu, Jan 31, 2013 at 02:12:28PM +0100, Ingo Molnar wrote: > > > > * Yuanhan Liu <[email protected]> wrote: > > > > > BTW, mind to tell a nice test case for mmap_sem? > > > > this one was write-hitting on mmap_sem pretty hard, last I > > checked: > > > > http://people.redhat.com/mingo/threaded-mmap-stresstest/ > > Thanks! > > Is there any pass condition? I tested a while, at least I > found no oops or any noisy from dmesg output. Is that OK?
Yeah, not crashing and not hanging is the expected behavior.
> Well, sometimes, it will quit peacefully. Sometimes it will
> not. ps -eo 'pid, state,wchan,comm' shows that it is sleeping
> at futex_wait_queue_me().
>
> NOTE: this happens both with or w/o this patch. Thus it may
> not an issue introduced by this patch?
hm, that's unexpected - it's expected to loop infinitely. I have
a newer version (attached) - is that exiting too?
Maybe this triggers spuriously:
if (!info->si_addr)
raise(SIGABRT); /* Allow GDB backtrace */
although then you should see the SIGABRT as an irregular exit
IIRC.
Thanks,
Ingo
threaded-mmap-stresstest.tar.gz
Description: GNU Zip compressed data
