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    SubjectRe: [PATCH 00/12] perf lock: New subcommand "perf lock", for analyzing lock statistics
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    On Fri, 2010-01-22 at 11:42 -0500, Jason Baron wrote:
    > On Fri, Jan 22, 2010 at 10:39:01PM +0900, Hitoshi Mitake wrote:
    > > Adding new subcommand "perf lock" to perf.
    > >
    >
    > looks like a really intresting patch! Does this patch mean that we can
    > potentially remove CONFIG_LOCK_STAT, now that the functionality is
    > available via 'perf'? Another desire for me has been to able to run
    > lockstat on production box. This has not been possible before without
    > incurring the performance penalty of lockdep. however, with 'perf' tools
    > ability to be turned on an off, perhaps there is (or we can build) a
    > mode for lockdep that is lower overhead for this usecase?

    boot with: prove_locking=0

    This patch still needs all the hooks and bits from lockdep, no way you
    want all that in a prodction kernel.



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