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thin: enable usage of kernel low_water_mark

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Now with correctly functioning dmeventd enable usage of
low_water_mark for faster reaction on pool's threshold.

When user select e.g. 80% as a threshold value,
dmeventd doesn't need to wait 10 seconds till monitoring
timer expires, but nearly instantly resizes thin-pool
to fit bellow threshold.
This commit is contained in:
Zdenek Kabelac 2015-10-29 11:58:06 +01:00
parent 099466939e
commit 99237f0908
2 changed files with 14 additions and 1 deletions
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1
WHATS_NEW
View File

@ -1,5 +1,6 @@
Version 2.02.133 - Version 2.02.133 -
====================================== ======================================
Thin pool targets uses low_water_mark from profile.
Dropping 'yet' from error of unsupported thick snapshot of snapshots. Dropping 'yet' from error of unsupported thick snapshot of snapshots.
Do not support unpartitioned DASD devices with CDL formatted with pvcreate. Do not support unpartitioned DASD devices with CDL formatted with pvcreate.
For thins use flush for suspend only when volume size is reduced. For thins use flush for suspend only when volume size is reduced.

14
lib/thin/thin.c
View File

@ -266,6 +266,8 @@ static int _thin_pool_add_target_line(struct dev_manager *dm,
struct lvinfo info; struct lvinfo info;
uint64_t transaction_id = 0; uint64_t transaction_id = 0;
unsigned attr; unsigned attr;
uint64_t low_water_mark;
int threshold;
if (!_thin_target_present(cmd, NULL, &attr)) if (!_thin_target_present(cmd, NULL, &attr))
return_0; return_0;
@ -294,10 +296,20 @@ static int _thin_pool_add_target_line(struct dev_manager *dm,
return 0; return 0;
} }
threshold = find_config_tree_int(seg->lv->vg->cmd,
activation_thin_pool_autoextend_threshold_CFG,
lv_config_profile(seg->lv));
if (threshold < 50)
threshold = 50;
if (threshold < 100)
low_water_mark = (len * threshold + 99) / 100;
else
low_water_mark = len;
if (!dm_tree_node_add_thin_pool_target(node, len, if (!dm_tree_node_add_thin_pool_target(node, len,
seg->transaction_id, seg->transaction_id,
metadata_dlid, pool_dlid, metadata_dlid, pool_dlid,
seg->chunk_size, seg->low_water_mark, seg->chunk_size, low_water_mark,
seg->zero_new_blocks ? 0 : 1)) seg->zero_new_blocks ? 0 : 1))
return_0; return_0;