The latch needs to be coordinated with writes to the namespace and that
makes it not suitable as a dimm-add-event udev rule.
Additionally, the dirty-shutdown-count is something that can live in
sysfs alongside the other health state flags in /sys/.../nmemX/nfit.
Otherwise, calling any of the libndctl apis from a udev script means the
entire udev queue can get blocked behind a ndctl_bus_wait_probe() call.
That's too much overhead for a non-default policy.
In other words, while the latch event remains in userspace as close as
possible to the application that wants to manage dimm-flush-failed
policy as anything other than fatal, dirty-shutdown-count caching should
move to sysfs where it is cheap to implement and compliments the
flush-failed health state flag.
---
Dan Williams (3):
ndctl: Introduce dirty-dimm command
ndctl: Revert "ndctl, intel: Fallback to smart cached shutdown_count"
ndctl: Revert "ndctl: Create ndctl udev rules for dirty shutdown"
.gitignore | 1
Documentation/ndctl/Makefile.am | 1
Documentation/ndctl/ndctl-dirty-dimm.txt | 29 ++++++
Makefile.am | 3 -
builtin.h | 1
configure.ac | 10 --
contrib/80-ndctl.rules | 3 -
ndctl.spec.in | 3 -
ndctl/Makefile.am | 5 -
ndctl/dimm.c | 28 ++++++
ndctl/lib/intel.c | 41 --------
ndctl/lib/libndctl.c | 6 -
ndctl/lib/private.h | 3 -
ndctl/ndctl-udev.c | 150 ------------------------------
ndctl/ndctl.c | 1
15 files changed, 61 insertions(+), 224 deletions(-)
create mode 100644 Documentation/ndctl/ndctl-dirty-dimm.txt
delete mode 100644 contrib/80-ndctl.rules
delete mode 100644 ndctl/ndctl-udev.c
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