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    SubjectRe: [PATCH] block: strip out locking optimization in put_io_context()
    From
    2012/2/9 Tejun Heo <tj@kernel.org>:
    > Hello, Shaohua.
    >
    > On Wed, Feb 08, 2012 at 04:29:53PM +0800, Shaohua Li wrote:
    >> > the test adds mem=4G in a 2 sockets 16 CPU machine.
    >> > just make several copy of kernel source in tmpfs (so there is swap
    >> > depending on your
    >> > memory size) and run kernel build in the kernel source in the meaning time.
    >> > there is only one swap device which is a rotating disk.
    >> >
    >> > I'll test both patches soon.
    >>
    >> Tried all the options, the regression still exists. Any new idea?
    >> I'll spend some time on it if I can get anything
    >
    > Can you please try the following one?  Thanks a lot!
    doesn't work.
    I also double confirmed b2efa05265d62 causes the regression
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