Re: [PATCH 3.3] memcg: free mem_cgroup by RCU to fix oops

[Hugh Dickins]

On Wed, 7 Mar 2012, Hugh Dickins wrote:
> 
> I'm posting this a little prematurely to get eyes on it, since it's
> more than a two-liner, but 3.3 time is running out.  If it is what's
> needed to fix my oopses, I won't really be sure before Friday morning.
> What's running now on the machine affected is using kfree_rcu(), but I
> did hack it earlier to check that the vfree_rcu() alternative works.

Yes, please do send that patch on to Linus for 3.3.

It did not get as much as the 36 hours of testing I had hoped for, only
25 hours so far.  12 hours while I was out yesterday got wasted by a
wireless driver interrupt spewing approximately one million messages:

iwl3945 0000:08:00.0: MAC is in deep sleep!. CSR_GP_CNTRL = 0xFFFFFFFF

which I've not suffered from before, and hope not again.  Having kdb
in, I did take a look what was going on with the memcg load when it was
interrupted: it appeared to be normal, and I've no reason to suppose that
my kfree_rcu() was in any way responsible for the wireless aberration.

Thanks,
Hugh
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