On 02/06/2015 09:55 PM, Linus Torvalds wrote:
On Fri, Feb 6, 2015 at 6:49 AM, Raghavendra K T
<raghavendra.kt@xxxxxxxxxxxxxxxxxx> wrote:
Paravirt spinlock clears slowpath flag after doing unlock.
[ fix edited out ]
So I'm not going to be applying this for 3.19, because it's much too
late and the patch is too scary. Plus the bug probably effectively
never shows up in real life (it is probably easy to trigger the
speculative *read* but probably never the actual speculative write
after dropping the lock last).
Understood and agreed.
This will need a lot of testing by the paravirt people - both
performance and correctness. So *maybe* for 3.20, but maybe for even
later, and then marked for stable, of course.
Are there any good paravirt stress-tests that people could run for
extended times?
I have been running several benchmarks (kern, sys, hack, ebizzy etc in
in 1x,2x scenarios. I run them for performance test as well.
(In the current patch I did not get kvm hang in normal run, But
overcommit reproduced it).
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