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    SubjectRe: [RFC] block/throttle: Add IO throttled information in blkcg.
    Hi Vivek,
    On 05/22/2012 07:11 PM, Vivek Goyal wrote:
    > On Tue, May 22, 2012 at 04:10:36PM +0800, Tao Ma wrote:
    >> From: Tao Ma <>
    >> Currently, if the IO is throttled by io-throttle, the SA has no idea of
    >> the situation and can't report it to the real application user about
    >> that he/she has to do something. So this patch adds a new interface
    >> named blkio.throttle.io_throttled which indicates how many IOs are
    >> currently throttled.
    > If the only purpose is to know whether IOs are being throttled, why
    > not just scan for the rules and see if respective device has any
    > throttling rules or not.
    > Even if you introduce this interface, you will end up scanning for
    > throttled ios against that particular device. And if IO is not happening
    > at that moment or if IO rate is not exceeding the rate limit, there
    > might not be any throttled ios and one might get misled.
    > So for your purpose a better interface sounds like scanning for throttling
    > rules instead of this new interface.
    >> I am not sure whether it is OK to add this information to the generic
    >> blkcg since it is only io-throttle related, but I don't find a way to
    >> only store it into the blkcg io-throttle. And that's the reason this
    >> is only a RFC. Any suggestions? Thanks.
    > Tejun has changed the code in this area and new code will allow you to
    > introduce this file in blk-throttle.c. All that code is sitting in Jens's
    > block tree.
    I am just trying to rebase my patch according to your suggestion, but I
    can't find the change you mentioned above. So could you please tell me
    where I can find the related change so that I can base my work on?

    > Thanks
    > Vivek
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