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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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2
src/promotion/nhit/nhit.c
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@@ -181,7 +181,7 @@ bool nhit_req_should_promote(ocf_promotion_policy_t policy,
uint64_t core_line;
uint64_t occupied_cachelines =
ocf_metadata_get_cachelines_count(policy->owner) -
policy->owner->device->freelist_part->curr_size;
ocf_freelist_num_free(policy->owner->freelist);
if (occupied_cachelines > env_atomic64_read(&ctx->trigger_threshold))
return true;