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lvmlockd: reduce io impact for finding sanlock lv free lock offset

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currently, lvcreate for sanlock find the free lock offset
from the beginning of the lvmlock every time.
after created thousands of lvs, it will issue thousands of read
ios for lvcreate to find free lock offset.
remeber the last free lock offset will greatly reduce the impact

Signed-off-by: Zhang Huan <zhanghuan@huayun.com>
This commit is contained in:
Zhang Huan 2017-08-15 10:42:44 -05:00 committed by David Teigland
parent aa75ca6332
commit 43305ae8da
2 changed files with 24 additions and 3 deletions
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1
daemons/lvmlockd/lvmlockd-core.c
View File

@ -3304,7 +3304,6 @@ static int work_init_lv(struct action *act)
lm_type = ls->lm_type;
memcpy(vg_args, ls->vg_args, MAX_ARGS);
free_offset = ls->free_lock_offset;
ls->free_lock_offset = 0;
}
pthread_mutex_unlock(&lockspaces_mutex);

24
daemons/lvmlockd/lvmlockd-sanlock.c
View File

@ -938,7 +938,9 @@ int lm_find_free_lock_sanlock(struct lockspace *ls, uint64_t *free_offset)
struct lm_sanlock *lms = (struct lm_sanlock *)ls->lm_data;
struct sanlk_resourced rd;
uint64_t offset;
uint64_t start_offset;
int rv;
int round = 0;
if (daemon_test) {
*free_offset = (1048576 * LV_LOCK_BEGIN) + (1048576 * (daemon_test_lv_count + 1));
@ -951,9 +953,22 @@ int lm_find_free_lock_sanlock(struct lockspace *ls, uint64_t *free_offset)
rd.rs.num_disks = 1;
strncpy(rd.rs.disks[0].path, lms->ss.host_id_disk.path, SANLK_PATH_LEN-1);
if (ls->free_lock_offset)
offset = ls->free_lock_offset;
else
offset = lms->align_size * LV_LOCK_BEGIN;
start_offset = offset;
while (1) {
if (offset >= start_offset && round) {
/* This indicates the all space are allocated. */
log_debug("S %s init_lv_san read back to start offset %llu",
ls->name, (unsigned long long)offset);
rv = -EMSGSIZE;
return rv;
}
rd.rs.disks[0].offset = offset;
memset(rd.rs.name, 0, SANLK_NAME_LEN);
@ -963,7 +978,14 @@ int lm_find_free_lock_sanlock(struct lockspace *ls, uint64_t *free_offset)
/* This indicates the end of the device is reached. */
log_debug("S %s find_free_lock_san read limit offset %llu",
ls->name, (unsigned long long)offset);
return -EMSGSIZE;
/* remember the NO SPACE offset, if no free area left,
* search from this offset after extend */
*free_offset = offset;
offset = lms->align_size * LV_LOCK_BEGIN;
round = 1;
continue;
}
/*