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| author | Jens Axboe <axboe@fb.com> | 2016-11-09 12:36:15 -0700 |
|---|---|---|
| committer | Jens Axboe <axboe@fb.com> | 2016-11-10 13:53:32 -0700 |
| commit | e34cbd307477ae07c5d8a8d0bd15e65a9ddaba5c (patch) | |
| tree | 2cf40c43afdc01d953eae0098c4f8bb4d760c8d9 /block/Makefile | |
| parent | cf43e6be865a582ba66ee4747ae27a0513f6bba1 (diff) | |
| download | lwn-e34cbd307477ae07c5d8a8d0bd15e65a9ddaba5c.tar.gz lwn-e34cbd307477ae07c5d8a8d0bd15e65a9ddaba5c.zip | |
blk-wbt: add general throttling mechanism
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>
Diffstat (limited to 'block/Makefile')
| -rw-r--r-- | block/Makefile | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/block/Makefile b/block/Makefile index 2528c596f7ec..a827f988c4e6 100644 --- a/block/Makefile +++ b/block/Makefile @@ -24,3 +24,4 @@ obj-$(CONFIG_BLK_CMDLINE_PARSER) += cmdline-parser.o obj-$(CONFIG_BLK_DEV_INTEGRITY) += bio-integrity.o blk-integrity.o t10-pi.o obj-$(CONFIG_BLK_MQ_PCI) += blk-mq-pci.o obj-$(CONFIG_BLK_DEV_ZONED) += blk-zoned.o +obj-$(CONFIG_BLK_WBT) += blk-wbt.o |