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e34cbd3074
We can hook this up to the block layer, to help throttle buffered
writes.
wbt registers a few trace points that can be used to track what is
happening in the system:
wbt_lat: 259:0: latency 2446318
wbt_stat: 259:0: rmean=2446318, rmin=2446318, rmax=2446318, rsamples=1,
wmean=518866, wmin=15522, wmax=5330353, wsamples=57
wbt_step: 259:0: step down: step=1, window=72727272, background=8, normal=16, max=32
This shows a sync issue event (wbt_lat) that exceeded it's time. wbt_stat
dumps the current read/write stats for that window, and wbt_step shows a
step down event where we now scale back writes. Each trace includes the
device, 259:0 in this case.
Signed-off-by: Jens Axboe <axboe@fb.com>
27 lines
1 KiB
Makefile
27 lines
1 KiB
Makefile
#
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# Makefile for the kernel block layer
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#
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obj-$(CONFIG_BLOCK) := bio.o elevator.o blk-core.o blk-tag.o blk-sysfs.o \
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blk-flush.o blk-settings.o blk-ioc.o blk-map.o \
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blk-exec.o blk-merge.o blk-softirq.o blk-timeout.o \
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blk-lib.o blk-mq.o blk-mq-tag.o blk-stat.o \
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blk-mq-sysfs.o blk-mq-cpumap.o ioctl.o \
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genhd.o scsi_ioctl.o partition-generic.o ioprio.o \
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badblocks.o partitions/
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obj-$(CONFIG_BOUNCE) += bounce.o
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obj-$(CONFIG_BLK_DEV_BSG) += bsg.o
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obj-$(CONFIG_BLK_DEV_BSGLIB) += bsg-lib.o
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obj-$(CONFIG_BLK_CGROUP) += blk-cgroup.o
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obj-$(CONFIG_BLK_DEV_THROTTLING) += blk-throttle.o
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obj-$(CONFIG_IOSCHED_NOOP) += noop-iosched.o
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obj-$(CONFIG_IOSCHED_DEADLINE) += deadline-iosched.o
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obj-$(CONFIG_IOSCHED_CFQ) += cfq-iosched.o
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obj-$(CONFIG_BLOCK_COMPAT) += compat_ioctl.o
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obj-$(CONFIG_BLK_CMDLINE_PARSER) += cmdline-parser.o
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obj-$(CONFIG_BLK_DEV_INTEGRITY) += bio-integrity.o blk-integrity.o t10-pi.o
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obj-$(CONFIG_BLK_MQ_PCI) += blk-mq-pci.o
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obj-$(CONFIG_BLK_DEV_ZONED) += blk-zoned.o
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obj-$(CONFIG_BLK_WBT) += blk-wbt.o
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