On Wed, Sep 19, 2012 at 7:00 AM, Raghavendra K T
<raghavendra...@linux.vnet.ibm.com> wrote:
>
> Create a 350 processes reading /sys/kernel/debug/kvm/spinlocks/histo_blocked
> file simultaneously in while loop for more than 3 hours on my box.
You need to open the file a single time, and then after that sinelg
open (either threaded or with fork()) do multiple concurrent copies
something like
for (;;) {
char buf[1024];
lseek(fd, 0, SEEK_SET);
read(fd, buf, sizeof(buf));
}
or similar. But it's important that they all share the same struct file.
It's also likely to make it easier to trigger the race if you have a
kernel with preemption enabled.
And you need to have SLAB debugging enabled to actually *see* the
messages. Otherwise you'll have just (possibly silent) corruption or a
memory leak.
Linus
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