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dmeventd_thin: new logic for calling commands

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For more advanced support we need to ensure better logic for calling
external much more advanced script for maintanance of thin-pool.

So this new code ensures:

When thin-pool data or metadata is bigger then 50%,
then with each 5% increment, action is called.
This is independent from autoextend_threshold.
This action always happens when thin-pool is over threshold,
(so no action when it's exactly i.e. 60%).
The only exception is 100% full thin-pool - which invokes 'last'
action.

Since thin-pool occupancy may change also downward, code needs
to also handle possibly reduction of occupancy  of thin-pool.
So when usage drop from 90% to 50%, thin-pool will start to call
again action when it will pass 55% threshold.

This give external commands lot of option i.e. to call 'fstrim'
before actual resize is needed.
This commit is contained in:
Zdenek Kabelac 2017-01-20 23:07:05 +01:00
parent 8b95551ade
commit 8c4f3633ac
1 changed files with 24 additions and 20 deletions
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44
daemons/dmeventd/plugins/thin/dmeventd_thin.c
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@ -243,21 +243,27 @@ void process_event(struct dm_task *dmt,
state->fails = 0;
}
/*
* Trigger action when threshold boundary is exceeded.
* Report 80% threshold warning when it's used above 80%.
* Only 100% is exception as it cannot be surpased so policy
* action is called for: >50%, >55% ... >95%, 100%
*/
state->metadata_percent = dm_make_percent(tps->used_metadata_blocks, tps->total_metadata_blocks);
if (state->metadata_percent <= WARNING_THRESH)
state->metadata_warn_once = 0; /* Dropped bellow threshold, reset warn once */
else if (!state->metadata_warn_once++) /* Warn once when raised above threshold */
log_warn("WARNING: Thin pool %s metadata is now %.2f%% full.",
device, dm_percent_to_float(state->metadata_percent));
if (state->metadata_percent >= state->metadata_percent_check) {
/*
* Usage has raised more than CHECK_STEP since the last
* time. Run actions.
*/
state->metadata_percent_check = (state->metadata_percent / CHECK_STEP) * CHECK_STEP + CHECK_STEP;
needs_policy = 1;
}
if (state->metadata_percent > CHECK_MINIMUM) {
/* Run action when usage raised more than CHECK_STEP since the last time */
if (state->metadata_percent > state->metadata_percent_check)
needs_policy = 1;
state->metadata_percent_check = (state->metadata_percent / CHECK_STEP + 1) * CHECK_STEP;
if (state->metadata_percent_check == DM_PERCENT_100)
state->metadata_percent_check--; /* Can't get bigger then 100% */
} else
state->metadata_percent_check = CHECK_MINIMUM;
state->data_percent = dm_make_percent(tps->used_data_blocks, tps->total_data_blocks);
if (state->data_percent <= WARNING_THRESH)
@ -265,15 +271,15 @@ void process_event(struct dm_task *dmt,
else if (!state->data_warn_once++)
log_warn("WARNING: Thin pool %s data is now %.2f%% full.",
device, dm_percent_to_float(state->data_percent));
if (state->data_percent >= state->data_percent_check) {
/*
* Usage has raised more than CHECK_STEP since
* the last time. Run actions.
*/
state->data_percent_check = (state->data_percent / CHECK_STEP) * CHECK_STEP + CHECK_STEP;
needs_policy = 1;
}
if (state->data_percent > CHECK_MINIMUM) {
/* Run action when usage raised more than CHECK_STEP since the last time */
if (state->data_percent > state->data_percent_check)
needs_policy = 1;
state->data_percent_check = (state->data_percent / CHECK_STEP + 1) * CHECK_STEP;
if (state->data_percent_check == DM_PERCENT_100)
state->data_percent_check--; /* Can't get bigger then 100% */
} else
state->data_percent_check = CHECK_MINIMUM;
/* Reduce number of _use_policy() calls by power-of-2 factor till frequency of MAX_FAILS is reached.
* Avoids too high number of error retries, yet shows some status messages in log regularly.
@ -372,8 +378,6 @@ int register_device(const char *device,
_init_thread_signals(state);
}
state->metadata_percent_check = CHECK_MINIMUM;
state->data_percent_check = CHECK_MINIMUM;
state->pid = -1;
*user = state;