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    SubjectRe: [PATCH 19/23] io-controller: map async requests to appropriate cgroup
    Vivek Goyal wrote:
    > o So far we were assuming that a bio/rq belongs to the task who is submitting
    > it. It did not hold good in case of async writes. This patch makes use of
    > blkio_cgroup pataches to attribute the aysnc writes to right group instead
    > of task submitting the bio.
    > o For sync requests, we continue to assume that io belongs to the task
    > submitting it. Only in case of async requests, we make use of io tracking
    > patches to track the owner cgroup.
    > o So far cfq always caches the async queue pointer. With async requests now
    > not necessarily being tied to submitting task io context, caching the
    > pointer will not help for async queues. This patch introduces a new config
    > option CONFIG_TRACK_ASYNC_CONTEXT. If this option is not set, cfq retains
    > old behavior where async queue pointer is cached in task context. If it
    > is set, async queue pointer is not cached and we take help of bio
    > tracking patches to determine group bio belongs to and then map it to
    > async queue of that group.
    > Signed-off-by: Nauman Rafique <>
    > Signed-off-by: Gui Jianfeng <>
    > Signed-off-by: Vivek Goyal <>

    Acked-by: Rik van Riel <>

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      Last update: 2009-08-31 19:43    [W:0.020 / U:227.768 seconds]
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