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author | Rodrigo Vivi <rodrigo.vivi@intel.com> | 2019-07-29 08:51:48 -0700 |
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committer | Rodrigo Vivi <rodrigo.vivi@intel.com> | 2019-07-29 08:51:48 -0700 |
commit | ed32f8d42cee118b075e4372a55c7739a11094b2 (patch) | |
tree | 5a806c5168d4177e0536b98b6bda30ec4bdbac43 /Documentation/admin-guide/device-mapper/delay.rst | |
parent | drm/i915: Flush the i915_vm_release before ggtt shutdown (diff) | |
parent | Linus 5.3-rc1 (diff) | |
download | linux-ed32f8d42cee118b075e4372a55c7739a11094b2.tar.gz linux-ed32f8d42cee118b075e4372a55c7739a11094b2.tar.bz2 linux-ed32f8d42cee118b075e4372a55c7739a11094b2.zip |
Merge drm/drm-next into drm-intel-next-queued
Catching up with 5.3-rc*
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
Diffstat (limited to 'Documentation/admin-guide/device-mapper/delay.rst')
-rw-r--r-- | Documentation/admin-guide/device-mapper/delay.rst | 31 |
1 files changed, 31 insertions, 0 deletions
diff --git a/Documentation/admin-guide/device-mapper/delay.rst b/Documentation/admin-guide/device-mapper/delay.rst new file mode 100644 index 000000000000..917ba8c33359 --- /dev/null +++ b/Documentation/admin-guide/device-mapper/delay.rst @@ -0,0 +1,31 @@ +======== +dm-delay +======== + +Device-Mapper's "delay" target delays reads and/or writes +and maps them to different devices. + +Parameters:: + + <device> <offset> <delay> [<write_device> <write_offset> <write_delay> + [<flush_device> <flush_offset> <flush_delay>]] + +With separate write parameters, the first set is only used for reads. +Offsets are specified in sectors. +Delays are specified in milliseconds. + +Example scripts +=============== + +:: + + #!/bin/sh + # Create device delaying rw operation for 500ms + echo "0 `blockdev --getsz $1` delay $1 0 500" | dmsetup create delayed + +:: + + #!/bin/sh + # Create device delaying only write operation for 500ms and + # splitting reads and writes to different devices $1 $2 + echo "0 `blockdev --getsz $1` delay $1 0 0 $2 0 500" | dmsetup create delayed |