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Clarify ALRU wake up time documentation

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ALRU does not have a configurable sleep time between active awakenings
of the cleaning thread. Once it starts cleaning, it does not back off
unless staleness time and/or activity threshold constraints force it
to do so. Wake up time parameter only controls sleep time after
an idle wake up.

Updating casadm help and man page accordingly.

Signed-off-by: Adam Rutkowski <adam.j.rutkowski@intel.com>
This commit is contained in:
Adam Rutkowski 2022-09-20 16:21:12 +02:00
parent 39fbe873df
commit f0a398116c
2 changed files with 4 additions and 2 deletions
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2
casadm/cas_main.c
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@ -740,7 +740,7 @@ static struct cas_param cas_cache_params[] = {
#define CLEANING_POLICY_TYPE_DESC "Cleaning policy type. " \ #define CLEANING_POLICY_TYPE_DESC "Cleaning policy type. " \
"Available policy types: {nop|alru|acp}" "Available policy types: {nop|alru|acp}"
#define CLEANING_ALRU_WAKE_UP_DESC "Period of time between awakenings of flushing thread <%d-%d>[s] (default: %d s)" #define CLEANING_ALRU_WAKE_UP_DESC "Cleaning thread sleep time after an idle wake up <%d-%d>[s] (default: %d s)"
#define CLEANING_ALRU_STALENESS_TIME_DESC "Time that has to pass from the last write operation before a dirty cache" \ #define CLEANING_ALRU_STALENESS_TIME_DESC "Time that has to pass from the last write operation before a dirty cache" \
" block can be scheduled to be flushed <%d-%d>[s] (default: %d s)" " block can be scheduled to be flushed <%d-%d>[s] (default: %d s)"
#define CLEANING_ALRU_FLUSH_MAX_BUFFERS_DESC "Number of dirty cache blocks to be flushed in one cleaning cycle" \ #define CLEANING_ALRU_FLUSH_MAX_BUFFERS_DESC "Number of dirty cache blocks to be flushed in one cleaning cycle" \

4
casadm/casadm.8
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@ -286,7 +286,9 @@ Identifier of cache instance <1-16384>.
.TP .TP
.B -w, --wake-up <NUMBER> .B -w, --wake-up <NUMBER>
Period of time between awakenings of flushing thread [s] (default: 20 s). Cleaning thread sleep time after an idle wake up [s] (default: 20 s).
Idle wake up happens when there is no dirty data or the cleaning thread does not start cleaning
due to staleness time and/or activity threshold constraints.
.TP .TP
.B -s, --staleness-time <NUMBER> .B -s, --staleness-time <NUMBER>