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Introduce multi-stream sequential cutoff

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Signed-off-by: Robert Baldyga <robert.baldyga@intel.com>
This commit is contained in:
Robert Baldyga
2020-03-20 00:10:21 +01:00
parent 332ad1dfbc
commit 93cd0615d3
8 changed files with 189 additions and 77 deletions
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66
src/engine/cache_engine.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_seq_cutoff.h"
#include "cache_engine.h"
#include "engine_common.h"
#include "engine_rd.h"
@@ -161,68 +162,6 @@ bool ocf_fallback_pt_is_on(ocf_cache_t cache)
cache->fallback_pt_error_threshold);
}
#define SEQ_CUTOFF_FULL_MARGIN \
(OCF_TO_EVICTION_MIN + OCF_PENDING_EVICTION_LIMIT)
static inline bool ocf_seq_cutoff_is_on(ocf_cache_t cache)
{
if (!ocf_cache_is_device_attached(cache))
return false;
return (ocf_freelist_num_free(cache->freelist) <=
SEQ_CUTOFF_FULL_MARGIN);
}
bool ocf_seq_cutoff_check(ocf_core_t core, uint32_t dir, uint64_t addr,
uint64_t bytes)
{
ocf_cache_t cache = ocf_core_get_cache(core);
ocf_seq_cutoff_policy policy = ocf_core_get_seq_cutoff_policy(core);
switch (policy) {
case ocf_seq_cutoff_policy_always:
break;
case ocf_seq_cutoff_policy_full:
if (ocf_seq_cutoff_is_on(cache))
break;
return false;
case ocf_seq_cutoff_policy_never:
return false;
default:
ENV_WARN(true, "Invalid sequential cutoff policy!");
return false;
}
if (dir == core->seq_cutoff.rw &&
core->seq_cutoff.last == addr &&
core->seq_cutoff.bytes + bytes >=
ocf_core_get_seq_cutoff_threshold(core)) {
return true;
}
return false;
}
void ocf_seq_cutoff_update(ocf_core_t core, struct ocf_request *req)
{
/*
* If IO is not consequent or has another direction,
* reset sequential cutoff state.
*/
if (req->byte_position != core->seq_cutoff.last ||
req->rw != core->seq_cutoff.rw) {
core->seq_cutoff.rw = req->rw;
core->seq_cutoff.bytes = 0;
}
/* Update last accessed position and bytes counter */
core->seq_cutoff.last = req->byte_position + req->byte_length;
core->seq_cutoff.bytes += req->byte_length;
}
void ocf_resolve_effective_cache_mode(ocf_cache_t cache,
ocf_core_t core, struct ocf_request *req)
{
@@ -242,8 +181,7 @@ void ocf_resolve_effective_cache_mode(ocf_cache_t cache,
return;
}
if (ocf_seq_cutoff_check(core, req->rw, req->byte_position,
req->byte_length)) {
if (ocf_core_seq_cutoff_check(core, req)) {
req->cache_mode = ocf_req_cache_mode_pt;
req->seq_cutoff = 1;
return;