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authorVivek Goyal <vgoyal@redhat.com>2011-05-19 15:38:28 -0400
committerJens Axboe <jaxboe@fusionio.com>2011-05-20 20:34:52 +0200
commit5624a4e445e2ec27582984b068d7bf7f127cee10 (patch)
tree0827c83c6e5f5fa83bd0dadc1bc395c0f0657dae /fs/jfs
parent4843c69d496a8d2e4caab6182fe016b9a79136e0 (diff)
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blk-throttle: Make dispatch stats per cpu
Currently we take blkg_stat lock for even updating the stats. So even if a group has no throttling rules (common case for root group), we end up taking blkg_lock, for updating the stats. Make dispatch stats per cpu so that these can be updated without taking blkg lock. If cpu goes offline, these stats simply disappear. No protection has been provided for that yet. Do we really need anything for that? Signed-off-by: Vivek Goyal <vgoyal@redhat.com> Signed-off-by: Jens Axboe <jaxboe@fusionio.com>
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