diff options
Diffstat (limited to 'include/sys/ddt_impl.h')
| -rw-r--r-- | include/sys/ddt_impl.h | 52 |
1 files changed, 48 insertions, 4 deletions
diff --git a/include/sys/ddt_impl.h b/include/sys/ddt_impl.h index 6f11cd90c..4d3c0cae0 100644 --- a/include/sys/ddt_impl.h +++ b/include/sys/ddt_impl.h @@ -35,8 +35,11 @@ extern "C" { #endif /* DDT version numbers */ -#define DDT_VERSION_LEGACY (0) -#define DDT_VERSION_FDT (1) +#define DDT_VERSION_LEGACY (0) +#define DDT_VERSION_FDT (1) + +/* Dummy version to signal that configure is still necessary */ +#define DDT_VERSION_UNCONFIGURED (UINT64_MAX) /* Names of interesting objects in the DDT root dir */ #define DDT_DIR_VERSION "version" @@ -187,8 +190,11 @@ extern void ddt_log_commit(ddt_t *ddt, ddt_log_update_t *dlu); extern boolean_t ddt_log_take_first(ddt_t *ddt, ddt_log_t *ddl, ddt_lightweight_entry_t *ddlwe); -extern boolean_t ddt_log_take_key(ddt_t *ddt, ddt_log_t *ddl, - const ddt_key_t *ddk, ddt_lightweight_entry_t *ddlwe); + +extern boolean_t ddt_log_find_key(ddt_t *ddt, const ddt_key_t *ddk, + ddt_lightweight_entry_t *ddlwe); +extern boolean_t ddt_log_remove_key(ddt_t *ddt, ddt_log_t *ddl, + const ddt_key_t *ddk); extern void ddt_log_checkpoint(ddt_t *ddt, ddt_lightweight_entry_t *ddlwe, dmu_tx_t *tx); @@ -212,6 +218,44 @@ extern void ddt_log_fini(void); */ /* + * We use a histogram to convert a percentage request into a + * cutoff value where entries older than the cutoff get pruned. + * + * The histogram bins represent hours in power-of-two increments. + * 16 bins covers up to four years. + */ +#define HIST_BINS 16 + +typedef struct ddt_age_histo { + uint64_t dah_entries; + uint64_t dah_age_histo[HIST_BINS]; +} ddt_age_histo_t; + +void ddt_prune_walk(spa_t *spa, uint64_t cutoff, ddt_age_histo_t *histogram); + +#if defined(_KERNEL) || !defined(ZFS_DEBUG) +#define ddt_dump_age_histogram(histo, cutoff) ((void)0) +#else +static inline void +ddt_dump_age_histogram(ddt_age_histo_t *histogram, uint64_t cutoff) +{ + if (histogram->dah_entries == 0) + return; + + (void) printf("DDT prune unique class age, %llu hour cutoff\n", + (u_longlong_t)(gethrestime_sec() - cutoff)/3600); + (void) printf("%5s %9s %4s\n", "age", "blocks", "amnt"); + (void) printf("%5s %9s %4s\n", "-----", "---------", "----"); + for (int i = 0; i < HIST_BINS; i++) { + (void) printf("%5d %9llu %4d%%\n", 1<<i, + (u_longlong_t)histogram->dah_age_histo[i], + (int)((histogram->dah_age_histo[i] * 100) / + histogram->dah_entries)); + } +} +#endif + +/* * Enough room to expand DMU_POOL_DDT format for all possible DDT * checksum/class/type combinations. */ |