Messages in this thread | | | From | Akinobu Mita <> | Subject | [PATCH 0/4] blk-mq: fix race conditions on cpu hotplug handling | Date | Sun, 21 Jun 2015 22:52:27 +0900 |
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This patchset addresses several race conditions on cpu hotplug handling for blk-mq. All problems are reproducible by the following script.
while true; do echo 0 > /sys/devices/system/cpu/cpu1/online echo 1 > /sys/devices/system/cpu/cpu1/online done &
while true; do modprobe -r null_blk modprobe null_blk queue_mode=2 irqmode=1 sleep 0.1 done
Akinobu Mita (4): blk-mq: fix sysfs registration/unregistration race blk-mq: fix q->mq_map access race blk-mq: establish new mapping before cpu starts handling requests blk-mq: fix mq_usage_counter race when switching to percpu mode
block/blk-mq-cpumap.c | 9 ++++---- block/blk-mq-sysfs.c | 21 +++++++++++++++++-- block/blk-mq.c | 56 +++++++++++++++++++++++++++++++++----------------- block/blk-mq.h | 3 ++- include/linux/blk-mq.h | 1 + include/linux/blkdev.h | 6 ++++++ 6 files changed, 70 insertions(+), 26 deletions(-)
-- 1.9.1
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