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Extend CAS interface with Write-only cache mode

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Write-only (WO) cache mode is similar to Write-back (WB), however
read operations do not promote data to cache. Reads are mostly
serviced by the core device, only dirty sectors are fetched from
the cache.

Write-only cache mode is behaving similarly to Write-back with
respect to flushing dirty data. For example it is required to
explicitly enable/disable flushing when changing cache mode
from WO to something other than WB.

Signed-off-by: Adam Rutkowski <adam.j.rutkowski@intel.com>
This commit is contained in:
Adam Rutkowski
2019-06-07 15:10:11 -04:00
parent a9eb0ee705
commit ffa1f4b067
7 changed files with 31 additions and 18 deletions
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5
casadm/statistics_model.c
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@@ -911,9 +911,8 @@ int cache_stats_conf(int ctrl_fd, const struct kcas_cache_info *cache_info,
return FAILURE;
print_kv_pair(outfile, "Inactive Core Devices", "%d", inactive_cores);
print_kv_pair(outfile, "Write Policy", "%s%s",
(flush_progress && cache_info->info.cache_mode != ocf_cache_mode_wb)
? "wb->" : "", cache_mode_to_name(cache_info->info.cache_mode));
print_kv_pair(outfile, "Write Policy", "%s",
cache_mode_to_name(cache_info->info.cache_mode));
print_kv_pair(outfile, "Eviction Policy", "%s",
eviction_policy_to_name(cache_info->info.eviction_policy));
print_kv_pair(outfile, "Cleaning Policy", "%s",