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cache: enhance lvdisplay for cache volumes

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Better support for lvdisplay.
By default info about running (in kernel) cache status is printed.
To get 'segtype' info, user runs: 'lvdisplay -m',  example:

  --- Logical volume ---
  LV Path                /dev/vg/lvol0
  LV Name                lvol0
  VG Name                vg
  LV UUID                Y4uWuN-TBGk-duer-aPWl-yBWn-iFFR-RU1gg1
  LV Write Access        read/write
  LV Creation host, time linux, 2017-03-01 20:52:39 +0100
  LV Cache pool name     lvol2
  LV Cache origin name   lvol0_corig
  LV Status              available
  # open                 0
  LV Size                12,00 MiB
  Cache used blocks      10,42%
  Cache metadata blocks  0,49%
  Cache dirty blocks     0,00%
  Cache read hits/misses 112 / 34
  Cache wrt hits/misses  133 / 0
  Cache demotions        0
  Cache promotions       20
  Current LE             3
  Segments               1
  Allocation             inherit
  Read ahead sectors     auto
  - currently set to     256
  Block device           253:0

  --- Segments ---
  Logical extents 0 to 2:
    Type		cache
    Chunk size		64,00 KiB
    Metadata format	1
    Mode		writethrough
    Policy		smq
      Setting		migration_threshold=100000
This commit is contained in:
Zdenek Kabelac 2017-03-02 00:15:11 +01:00
parent 4d2b1a0660
commit 52935b5834
3 changed files with 63 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
WHATS_NEW
View File

@ -1,5 +1,6 @@
Version 2.02.169 -
=====================================
Lvdisplay [-m] shows more informations for cached volumes.
Add option for lvcreate/lvconvert --cachemetadataformat auto|1|2.
Support cache segment with configurable metadata format.
Add allocation/cache_metadata_format profilable setttings.

27
lib/cache_segtype/cache.c
View File

@ -36,6 +36,31 @@ static unsigned _feature_mask;
log_error(t " segment %s of logical volume %s.", ## p, \
dm_config_parent_name(sn), seg->lv->name), 0;
static int _cache_out_line(const char *line, void *_f)
{
log_print(" Setting\t\t%s", line);
return 1;
}
static void _cache_display(const struct lv_segment *seg)
{
const struct dm_config_node *n;
const struct lv_segment *pool_seg =
seg_is_cache_pool(seg) ? seg : first_seg(seg->pool_lv);
log_print(" Chunk size\t\t%s",
display_size(seg->lv->vg->cmd, pool_seg->chunk_size));
log_print(" Metadata format\t%u", pool_seg->cache_metadata_format);
log_print(" Mode\t\t%s", get_cache_mode_name(pool_seg));
log_print(" Policy\t\t%s", pool_seg->policy_name);
if ((n = pool_seg->policy_settings->child))
dm_config_write_node(n, _cache_out_line, NULL);
log_print(" ");
}
/*
* When older metadata are loaded without newer settings,
* set then to default settings (the one that could have been
@ -356,6 +381,7 @@ static int _modules_needed(struct dm_pool *mem,
#endif /* DEVMAPPER_SUPPORT */
static struct segtype_handler _cache_pool_ops = {
.display = _cache_display,
.text_import = _cache_pool_text_import,
.text_import_area_count = _cache_pool_text_import_area_count,
.text_export = _cache_pool_text_export,
@ -519,6 +545,7 @@ static int _cache_add_target_line(struct dev_manager *dm,
#endif /* DEVMAPPER_SUPPORT */
static struct segtype_handler _cache_ops = {
.display = _cache_display,
.text_import = _cache_text_import,
.text_import_area_count = _cache_text_import_area_count,
.text_export = _cache_text_export,

35
lib/display/display.c
View File

@ -386,6 +386,7 @@ int lvdisplay_full(struct cmd_context *cmd,
dm_percent_t thin_data_percent, thin_metadata_percent;
int thin_active = 0;
dm_percent_t thin_percent;
struct lv_status_cache *cache_status = NULL;
if (lv_is_historical(lv))
return _lvdisplay_historical_full(cmd, lv);
@ -491,6 +492,19 @@ int lvdisplay_full(struct cmd_context *cmd,
seg = first_seg(lv);
log_print("LV Pool metadata %s", seg->metadata_lv->name);
log_print("LV Pool data %s", seg_lv(seg, 0)->name);
} else if (lv_is_cache_origin(lv)) {
log_print("LV origin of Cache LV %s",
get_only_segment_using_this_lv(lv)->lv->name);
} else if (lv_is_cache(lv)) {
seg = first_seg(lv);
if (inkernel && !lv_cache_status(lv, &cache_status))
return_0;
log_print("LV Cache pool name %s", seg->pool_lv->name);
log_print("LV Cache origin name %s", seg_lv(seg, 0)->name);
} else if (lv_is_cache_pool(lv)) {
seg = first_seg(lv);
log_print("LV Pool metadata %s", seg->metadata_lv->name);
log_print("LV Pool data %s", seg_lv(seg, 0)->name);
}
if (inkernel && info.suspended)
@ -510,6 +524,27 @@ int lvdisplay_full(struct cmd_context *cmd,
display_size(cmd,
snap_seg ? snap_seg->origin->size : lv->size));
if (cache_status) {
log_print("Cache used blocks %.2f%%",
dm_percent_to_float(cache_status->data_usage));
log_print("Cache metadata blocks %.2f%%",
dm_percent_to_float(cache_status->metadata_usage));
log_print("Cache dirty blocks %.2f%%",
dm_percent_to_float(cache_status->dirty_usage));
log_print("Cache read hits/misses " FMTu64 " / " FMTu64,
cache_status->cache->read_hits,
cache_status->cache->read_misses);
log_print("Cache wrt hits/misses " FMTu64 " / " FMTu64,
cache_status->cache->write_hits,
cache_status->cache->write_misses);
log_print("Cache demotions " FMTu64,
cache_status->cache->demotions);
log_print("Cache promotions " FMTu64,
cache_status->cache->promotions);
dm_pool_destroy(cache_status->mem);
}
if (thin_data_active)
log_print("Allocated pool data %.2f%%",
dm_percent_to_float(thin_data_percent));