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Per-execution-context freelists

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Global free cacheline list is divided into a set of freelists, one
per execution context. When attempting to map addres to cache, first
the freelist for current execution context is considered (fast path).
If current execution context freelist is empty (fast path failure),
mapping function attempts to get freelist from other execution context
list (slow path).

The purpose of this change is improve concurrency in freelist access.
It is part of fine granularity metadata lock implementation.

Signed-off-by: Adam Rutkowski <adam.j.rutkowski@intel.com>
This commit is contained in:
Adam Rutkowski
2019-08-26 14:54:19 -04:00
parent f892bb962d
commit 13cf871a13
21 changed files with 545 additions and 204 deletions
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11
src/engine/engine_common.c
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@@ -7,6 +7,7 @@
#include "../ocf_priv.h"
#include "../ocf_cache_priv.h"
#include "../ocf_queue_priv.h"
#include "../ocf_freelist.h"
#include "engine_common.h"
#define OCF_ENGINE_DEBUG_IO_NAME "common"
#include "engine_debug.h"
@@ -250,19 +251,11 @@ static void ocf_engine_map_cache_line(struct ocf_request *req,
ocf_part_id_t part_id = req->part_id;
ocf_cleaning_t clean_policy_type;
if (cache->device->freelist_part->curr_size == 0) {
if (!ocf_freelist_get_cache_line(cache->freelist, cache_line)) {
req->info.mapping_error = 1;
return;
}
*cache_line = cache->device->freelist_part->head;
/* add_to_collision_list changes .next_col and other fields for entry
* so updated last_cache_line_give must be updated before calling it.
*/
ocf_metadata_remove_from_free_list(cache, *cache_line);
ocf_metadata_add_to_partition(cache, part_id, *cache_line);
/* Add the block to the corresponding collision list */