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cache: add cache_policy cache_settings

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Add new profilable configurables:

allocation/cache_policy
allocation/cache_settings

and mark allocation/cache_pool_chunk_size as profilable as well.

Obsolete allocation/cache_pool_cachemode and
introduce new allocation/cache_mode instead.

Rename DEFAULT_CACHE_POOL_POLICY to DEFAULT_CACHE_POLICY.
This commit is contained in:
Zdenek Kabelac 2015-07-20 11:44:15 +02:00
parent 664a9f4830
commit 036d90bba6
7 changed files with 33 additions and 7 deletions
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1
WHATS_NEW
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@ -1,5 +1,6 @@
Version 2.02.128 -
===================================
Add cmd profilable allocation/cache_policy,cache_settings,cache_mode.
Require cache_check 0.5.4 for use of --clear-needs-check-flag.
Fix lvmetad udev rules to not override SYSTEMD_WANTS, add the service instead.

2
lib/cache_segtype/cache.c
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@ -79,7 +79,7 @@ static int _cache_pool_text_import(struct lv_segment *seg,
return SEG_LOG_ERROR("Failed to duplicate policy in");
} else {
/* Cannot use 'just' default, so pick one */
seg->policy_name = DEFAULT_CACHE_POOL_POLICY; /* FIXME make configurable */
seg->policy_name = DEFAULT_CACHE_POLICY; /* FIXME make configurable */
/* FIXME maybe here should be always 'mq' */
log_warn("WARNING: cache_policy undefined, using default \"%s\" policy.",
seg->policy_name);

5
lib/config/config.c
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@ -2415,3 +2415,8 @@ int get_default_allocation_cache_pool_chunk_size_CFG(struct cmd_context *cmd, st
{
return DEFAULT_CACHE_POOL_CHUNK_SIZE * 2;
}
const char *get_default_allocation_cache_policy_CFG(struct cmd_context *cmd, struct profile *profile)
{
return DEFAULT_CACHE_POLICY;
}

2
lib/config/config.h
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@ -296,5 +296,7 @@ int get_default_allocation_thin_pool_chunk_size_CFG(struct cmd_context *cmd, str
#define get_default_unconfigured_allocation_thin_pool_chunk_size_CFG NULL
int get_default_allocation_cache_pool_chunk_size_CFG(struct cmd_context *cmd, struct profile *profile);
#define get_default_unconfigured_allocation_cache_pool_chunk_size_CFG NULL
const char *get_default_allocation_cache_policy_CFG(struct cmd_context *cmd, struct profile *profile);
#define get_default_unconfigured_allocation_cache_policy_CFG NULL
#endif

24
lib/config/config_settings.h
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@ -462,15 +462,33 @@ cfg(allocation_mirror_logs_require_separate_pvs_CFG, "mirror_logs_require_separa
cfg(allocation_cache_pool_metadata_require_separate_pvs_CFG, "cache_pool_metadata_require_separate_pvs", allocation_CFG_SECTION, 0, CFG_TYPE_BOOL, DEFAULT_CACHE_POOL_METADATA_REQUIRE_SEPARATE_PVS, vsn(2, 2, 106), NULL, 0, NULL,
"Cache pool metadata and data will always use different PVs.\n")
cfg(allocation_cache_pool_cachemode_CFG, "cache_pool_cachemode", allocation_CFG_SECTION, CFG_DEFAULT_COMMENTED, CFG_TYPE_STRING, DEFAULT_CACHE_POOL_CACHEMODE, vsn(2, 2, 113), NULL, 0, NULL,
"The default cache mode used for new cache pools.\n"
cfg(allocation_cache_pool_cachemode_CFG, "cache_pool_cachemode", allocation_CFG_SECTION, CFG_DEFAULT_COMMENTED, CFG_TYPE_STRING, DEFAULT_CACHE_MODE, vsn(2, 2, 113), NULL, vsn(2, 2, 128),
"This has been replaced by the allocation/cache_mode setting.\n",
"Cache mode.\n")
cfg(allocation_cache_mode_CFG, "cache_mode", allocation_CFG_SECTION, CFG_DEFAULT_COMMENTED, CFG_TYPE_STRING, DEFAULT_CACHE_MODE, vsn(2, 2, 128), NULL, 0, NULL,
"The default cache mode used for new cache.\n"
"Possible options are: writethrough, writeback.\n"
"writethrough - Data blocks are immediately written from\n"
"the cache to disk.\n"
"writeback - Data blocks are written from the cache back\n"
"to disk after some delay to improve performance.\n")
cfg_runtime(allocation_cache_pool_chunk_size_CFG, "cache_pool_chunk_size", allocation_CFG_SECTION, CFG_DEFAULT_UNDEFINED, CFG_TYPE_INT, vsn(2, 2, 106), 0, NULL,
cfg_runtime(allocation_cache_policy_CFG, "cache_policy", allocation_CFG_SECTION, CFG_PROFILABLE | CFG_DEFAULT_COMMENTED, CFG_TYPE_STRING, vsn(2, 2, 127), 0, NULL,
"The default cache policy used for new cache volume.\n"
"Generally available policies are: mq, smq.\n"
"mq - Multiqueue policy with 88 bytes per block\n"
"smq - Stochastic multique with 25 bytes per block (kernel >= 4.2).\n")
cfg_section(allocation_cache_settings_CFG_SECTION, "cache_settings", allocation_CFG_SECTION, CFG_PROFILABLE | CFG_DEFAULT_COMMENTED, vsn(2, 2, 127), 0, NULL,
"Individual settings for policies.\n"
"See the help for individual policies for more info.\n")
cfg_section(policy_settings_CFG_SUBSECTION, "policy_settings", allocation_cache_settings_CFG_SECTION, CFG_NAME_VARIABLE | CFG_SECTION_NO_CHECK | CFG_PROFILABLE | CFG_DEFAULT_COMMENTED, vsn(2, 2, 127), 0, NULL,
"Replace this subsection name with a policy name.\n"
"Multiple subsections for different policies can be created.\n")
cfg_runtime(allocation_cache_pool_chunk_size_CFG, "cache_pool_chunk_size", allocation_CFG_SECTION, CFG_PROFILABLE | CFG_DEFAULT_UNDEFINED, CFG_TYPE_INT, vsn(2, 2, 106), 0, NULL,
"The minimal chunk size (in kiB) for cache pool volumes.\n"
"Using a chunk_size that is too large can result in wasteful\n"
"use of the cache, where small reads and writes can cause\n"

4
lib/config/defaults.h
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@ -117,8 +117,8 @@
#define DEFAULT_CACHE_POOL_CHUNK_SIZE 64 /* KB */
#define DEFAULT_CACHE_POOL_MIN_METADATA_SIZE 2048 /* KB */
#define DEFAULT_CACHE_POOL_MAX_METADATA_SIZE (16 * 1024 * 1024) /* KB */
#define DEFAULT_CACHE_POOL_CACHEMODE "writethrough"
#define DEFAULT_CACHE_POOL_POLICY "mq"
#define DEFAULT_CACHE_POLICY "mq"
#define DEFAULT_CACHE_MODE "writethrough"
#define DEFAULT_UMASK 0077

2
tools/toollib.c
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@ -1408,7 +1408,7 @@ int get_cache_policy_params(struct cmd_context *cmd, const char **name,
struct dm_config_node *cn;
int ok = 0;
*name = arg_str_value(cmd, cachepolicy_ARG, DEFAULT_CACHE_POOL_POLICY);
*name = arg_str_value(cmd, cachepolicy_ARG, DEFAULT_CACHE_POLICY);
dm_list_iterate_items(group, &cmd->arg_value_groups) {
if (!grouped_arg_is_set(group->arg_values, cachesettings_ARG))