github/ocf
2
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

Evict from overflown partitions first

Browse Source 
Overflown partitions now have precedence over others during
eviction, regardless of IO class priorities.

Signed-off-by: Adam Rutkowski <adam.j.rutkowski@intel.com>
This commit is contained in:
Adam Rutkowski 2021-02-02 15:57:37 +01:00
parent 5538a5a95d
commit 746b32c47d
1 changed files with 51 additions and 12 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

63
src/eviction/eviction.c
View File

@ -60,53 +60,92 @@ static inline uint32_t ocf_evict_part_do(ocf_cache_t cache,
target_part, to_evict);
}
static inline uint32_t ocf_evict_do(ocf_cache_t cache,
ocf_queue_t io_queue, const uint32_t evict_cline_no,
struct ocf_user_part *target_part)
static inline uint32_t ocf_evict_partitions(ocf_cache_t cache,
ocf_queue_t io_queue, uint32_t evict_cline_no,
bool overflown_only, uint32_t max_priority)
{
uint32_t to_evict = 0, evicted = 0;
struct ocf_user_part *part;
ocf_part_id_t part_id;
unsigned overflow_size;
/* For each partition from the lowest priority to highest one */
for_each_part(cache, part, part_id) {
if (!ocf_eviction_can_evict(cache))
goto out;
/*
* Check stop and continue conditions
*/
if (target_part->config->priority > part->config->priority) {
if (max_priority > part->config->priority) {
/*
* iterate partition have higher priority, do not evict
* iterate partition have higher priority,
* do not evict
*/
break;
}
if (!part->config->flags.eviction) {
/* It seams that no more partition for eviction */
/* no more partitions available for viction
*/
break;
}
if (evicted >= evict_cline_no) {
/* Evicted requested number of cache line, stop */
goto out;
if (overflown_only) {
overflow_size = ocf_part_overflow_size(cache, part);
if (overflow_size == 0)
continue;
}
to_evict = ocf_evict_calculate(cache, part, evict_cline_no,
true);
to_evict = ocf_evict_calculate(cache, part,
evict_cline_no - evicted, true);
if (to_evict == 0) {
/* No cache lines to evict for this partition */
continue;
}
if (overflown_only)
to_evict = OCF_MIN(to_evict, overflow_size);
evicted += ocf_eviction_need_space(cache, io_queue,
part, to_evict);
if (evicted >= evict_cline_no) {
/* Evicted requested number of cache line, stop
*/
goto out;
}
}
out:
return evicted;
}
static inline uint32_t ocf_evict_do(ocf_cache_t cache,
ocf_queue_t io_queue, uint32_t evict_cline_no,
struct ocf_user_part *target_part)
{
uint32_t evicted;
/* First attempt to evict overflown partitions in order to
* achieve configured maximum size. Ignoring partitions
* priority in this case, as overflown partitions should
* free its cachelines regardless of destination partition
* priority. */
evicted = ocf_evict_partitions(cache, io_queue, evict_cline_no,
true, OCF_IO_CLASS_PRIO_HIGHEST);
if (evicted >= evict_cline_no)
return evicted;
/* Not enough cachelines in overflown partitions. Go through
* partitions with priority <= target partition and attempt
* to evict from those. */
evict_cline_no -= evicted;
evicted += ocf_evict_partitions(cache, io_queue, evict_cline_no,
false, target_part->config->priority);
return evicted;
}
int space_managment_evict_do(struct ocf_cache *cache,
struct ocf_request *req, uint32_t evict_cline_no)
{