Changes in v2:
- Add examples to the documentation page (Dave Hansen)
- Clarify documentation regarding the conversion from system-ram to devdax
- Remove any references to a persistent config from the documentation -
those can be added when the feature is added.
- device.c: validate option compatibility
- daxctl-list: display numa_node for device listings
- daxctl-list: display mode for device listings
- make the options more consistent by adding a '-O' short option
for --attempt-offline
Add a new daxctl-reconfigure-device command that lets us reconfigure DAX
devices back and forth between 'system-ram' and 'device-dax' modes. It
also includes facilities to online any newly hot-plugged memory
(default), and attempt to offline memory before converting away from the
system-ram mode (not default, requires a --attempt-offline option).
Currently missing from this series is a way to persistently store which
devices have been 'marked' for use as system-ram. This depends on a
config system overhaul in ndctl, and patches for those will follow
separately and are independent of this work.
Example invocations:
1. Reconfigure dax0.0 to system-ram mode, don’t online the memory
# daxctl reconfigure-device --mode=system-ram --no-online dax0.0
[
{
"chardev":"dax0.0",
"size":16777216000,
"numa_node":2,
"mode":"system-ram"
}
]
2. Reconfigure dax0.0 to devdax mode, attempt to offline the memory
# daxctl reconfigure-device --human --mode=devdax --attempt-offline dax0.0
{
"chardev":"dax0.0",
"size":"15.63 GiB (16.78 GB)",
"numa_node":2,
"mode":"devdax"
}
3. Reconfigure all dax devices on region0 to system-ram mode
# daxctl reconfigure-device --mode=system-ram --region=0 all
[
{
"chardev":"dax0.0",
"size":16777216000,
"numa_node":2,
"mode":"system-ram"
},
{
"chardev":"dax0.1",
"size":16777216000,
"numa_node":3,
"mode":"system-ram"
}
]
These patches can also be found in the 'kmem-pending' branch on github:
https://github.com/pmem/ndctl/tree/kmem-pending
Cc: Dan Williams <[email protected]>
Cc: Dave Hansen <[email protected]>
Cc: Pavel Tatashin <[email protected]>
Vishal Verma (10):
libdaxctl: add interfaces in support of device modes
libdaxctl: cache 'subsystem' in daxctl_ctx
libdaxctl: add interfaces to enable/disable devices
libdaxctl: add interfaces to get/set the online state for a node
daxctl/list: add numa_node for device listings
libdaxctl: add an interface to get the mode for a dax device
daxctl: add a new reconfigure-device command
Documentation/daxctl: add a man page for daxctl-reconfigure-device
contrib/ndctl: fix region-id completions for daxctl
contrib/ndctl: add bash-completion for daxctl-reconfigure-device
Documentation/daxctl/Makefile.am | 3 +-
.../daxctl/daxctl-reconfigure-device.txt | 118 ++++
contrib/ndctl | 34 +-
daxctl/Makefile.am | 2 +
daxctl/builtin.h | 1 +
daxctl/daxctl.c | 1 +
daxctl/device.c | 237 ++++++++
daxctl/lib/Makefile.am | 3 +-
daxctl/lib/libdaxctl-private.h | 21 +
daxctl/lib/libdaxctl.c | 554 +++++++++++++++++-
daxctl/lib/libdaxctl.sym | 14 +
daxctl/libdaxctl.h | 16 +
util/json.c | 22 +
13 files changed, 1015 insertions(+), 11 deletions(-)
create mode 100644 Documentation/daxctl/daxctl-reconfigure-device.txt
create mode 100644 daxctl/device.c
--
2.20.1
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