diff options
Diffstat (limited to 'database')
| -rw-r--r-- | database/Makefile.am | 8 | ||||
| -rw-r--r-- | database/Makefile.in | 703 | ||||
| -rw-r--r-- | database/engine/Makefile.am | 4 | ||||
| -rw-r--r-- | database/engine/Makefile.in | 519 | ||||
| -rw-r--r-- | database/engine/pagecache.c | 22 | ||||
| -rw-r--r-- | database/engine/pagecache.h | 8 | ||||
| -rw-r--r-- | database/engine/rrdengine.c | 56 | ||||
| -rw-r--r-- | database/engine/rrdengine.h | 3 | ||||
| -rw-r--r-- | database/engine/rrdengineapi.c | 37 | ||||
| -rw-r--r-- | database/engine/rrdengineapi.h | 4 | ||||
| -rw-r--r-- | database/engine/rrdenginelib.c | 22 | ||||
| -rw-r--r-- | database/rrd.h | 1 | ||||
| -rw-r--r-- | database/rrdhost.c | 2 | ||||
| -rw-r--r-- | database/rrdset.c | 38 |
14 files changed, 1361 insertions, 66 deletions
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+ install-data-am install-dvi install-dvi-am install-exec \ + install-exec-am install-html install-html-am install-info \ + install-info-am install-man install-pdf install-pdf-am \ + install-ps install-ps-am install-strip installcheck \ + installcheck-am installdirs maintainer-clean \ + maintainer-clean-generic mostlyclean mostlyclean-generic pdf \ + pdf-am ps ps-am tags-am uninstall uninstall-am + +.PRECIOUS: Makefile + + +# Tell versions [3.59,3.63) of GNU make to not export all variables. +# Otherwise a system limit (for SysV at least) may be exceeded. +.NOEXPORT: diff --git a/database/engine/pagecache.c b/database/engine/pagecache.c index a419ba981..449138b4d 100644 --- a/database/engine/pagecache.c +++ b/database/engine/pagecache.c @@ -214,7 +214,7 @@ static void pg_cache_release_pages(struct rrdengine_instance *ctx, unsigned numb * This function returns the maximum number of pages allowed in the page cache. * The caller must hold the page cache lock. */ -static inline unsigned long pg_cache_hard_limit(struct rrdengine_instance *ctx) +unsigned long pg_cache_hard_limit(struct rrdengine_instance *ctx) { /* it's twice the number of producers since we pin 2 pages per producer */ return ctx->max_cache_pages + 2 * (unsigned long)ctx->stats.metric_API_producers; @@ -225,7 +225,7 @@ static inline unsigned long pg_cache_hard_limit(struct rrdengine_instance *ctx) * number of pages below that number. * The caller must hold the page cache lock. */ -static inline unsigned long pg_cache_soft_limit(struct rrdengine_instance *ctx) +unsigned long pg_cache_soft_limit(struct rrdengine_instance *ctx) { /* it's twice the number of producers since we pin 2 pages per producer */ return ctx->cache_pages_low_watermark + 2 * (unsigned long)ctx->stats.metric_API_producers; @@ -1029,14 +1029,14 @@ static void init_replaceQ(struct rrdengine_instance *ctx) assert(0 == uv_rwlock_init(&pg_cache->replaceQ.lock)); } -static void init_commited_page_index(struct rrdengine_instance *ctx) +static void init_committed_page_index(struct rrdengine_instance *ctx) { struct page_cache *pg_cache = &ctx->pg_cache; - pg_cache->commited_page_index.JudyL_array = (Pvoid_t) NULL; - assert(0 == uv_rwlock_init(&pg_cache->commited_page_index.lock)); - pg_cache->commited_page_index.latest_corr_id = 0; - pg_cache->commited_page_index.nr_commited_pages = 0; + pg_cache->committed_page_index.JudyL_array = (Pvoid_t) NULL; + assert(0 == uv_rwlock_init(&pg_cache->committed_page_index.lock)); + pg_cache->committed_page_index.latest_corr_id = 0; + pg_cache->committed_page_index.nr_committed_pages = 0; } void init_page_cache(struct rrdengine_instance *ctx) @@ -1049,7 +1049,7 @@ void init_page_cache(struct rrdengine_instance *ctx) init_metrics_index(ctx); init_replaceQ(ctx); - init_commited_page_index(ctx); + init_committed_page_index(ctx); } void free_page_cache(struct rrdengine_instance *ctx) @@ -1062,9 +1062,9 @@ void free_page_cache(struct rrdengine_instance *ctx) struct rrdeng_page_descr *descr; struct page_cache_descr *pg_cache_descr; - /* Free commited page index */ - ret_Judy = JudyLFreeArray(&pg_cache->commited_page_index.JudyL_array, PJE0); - assert(NULL == pg_cache->commited_page_index.JudyL_array); + /* Free committed page index */ + ret_Judy = JudyLFreeArray(&pg_cache->committed_page_index.JudyL_array, PJE0); + assert(NULL == pg_cache->committed_page_index.JudyL_array); bytes_freed += ret_Judy; for (page_index = pg_cache->metrics_index.last_page_index ; diff --git a/database/engine/pagecache.h b/database/engine/pagecache.h index ab1a5c1ad..7d8fa2a1d 100644 --- a/database/engine/pagecache.h +++ b/database/engine/pagecache.h @@ -110,7 +110,7 @@ struct pg_cache_metrics_index { }; /* gathers dirty pages to be written on disk */ -struct pg_cache_commited_page_index { +struct pg_cache_committed_page_index { uv_rwlock_t lock; Pvoid_t JudyL_array; @@ -122,7 +122,7 @@ struct pg_cache_commited_page_index { */ Word_t latest_corr_id; - unsigned nr_commited_pages; + unsigned nr_committed_pages; }; /* @@ -140,7 +140,7 @@ struct page_cache { /* TODO: add statistics */ uv_rwlock_t pg_cache_rwlock; /* page cache lock */ struct pg_cache_metrics_index metrics_index; - struct pg_cache_commited_page_index commited_page_index; + struct pg_cache_committed_page_index committed_page_index; struct pg_cache_replaceQ replaceQ; unsigned page_descriptors; @@ -182,6 +182,8 @@ extern void init_page_cache(struct rrdengine_instance *ctx); extern void free_page_cache(struct rrdengine_instance *ctx); extern void pg_cache_add_new_metric_time(struct pg_cache_page_index *page_index, struct rrdeng_page_descr *descr); extern void pg_cache_update_metric_times(struct pg_cache_page_index *page_index); +extern unsigned long pg_cache_hard_limit(struct rrdengine_instance *ctx); +extern unsigned long pg_cache_soft_limit(struct rrdengine_instance *ctx); static inline void pg_cache_atomic_get_pg_info(struct rrdeng_page_descr *descr, usec_t *end_timep, uint32_t *page_lengthp) diff --git a/database/engine/rrdengine.c b/database/engine/rrdengine.c index 896d71f16..b6b6548ec 100644 --- a/database/engine/rrdengine.c +++ b/database/engine/rrdengine.c @@ -5,9 +5,8 @@ rrdeng_stats_t global_io_errors = 0; rrdeng_stats_t global_fs_errors = 0; -rrdeng_stats_t global_pg_cache_warnings = 0; -rrdeng_stats_t global_pg_cache_errors = 0; rrdeng_stats_t rrdeng_reserved_file_descriptors = 0; +rrdeng_stats_t global_flushing_errors = 0; void sanity_check(void) { @@ -253,6 +252,7 @@ void flush_pages_cb(uv_fs_t* req) { struct rrdengine_worker_config* wc = req->loop->data; struct rrdengine_instance *ctx = wc->ctx; + struct page_cache *pg_cache = &ctx->pg_cache; struct extent_io_descriptor *xt_io_descr; struct rrdeng_page_descr *descr; struct page_cache_descr *pg_cache_descr; @@ -290,6 +290,10 @@ void flush_pages_cb(uv_fs_t* req) uv_fs_req_cleanup(req); free(xt_io_descr->buf); freez(xt_io_descr); + + uv_rwlock_wrlock(&pg_cache->committed_page_index.lock); + pg_cache->committed_page_index.nr_committed_pages -= count; + uv_rwlock_wrunlock(&pg_cache->committed_page_index.lock); } /* @@ -323,14 +327,14 @@ static int do_flush_pages(struct rrdengine_worker_config* wc, int force, struct if (force) { debug(D_RRDENGINE, "Asynchronous flushing of extent has been forced by page pressure."); } - uv_rwlock_wrlock(&pg_cache->commited_page_index.lock); + uv_rwlock_wrlock(&pg_cache->committed_page_index.lock); for (Index = 0, count = 0, uncompressed_payload_length = 0, - PValue = JudyLFirst(pg_cache->commited_page_index.JudyL_array, &Index, PJE0), + PValue = JudyLFirst(pg_cache->committed_page_index.JudyL_array, &Index, PJE0), descr = unlikely(NULL == PValue) ? NULL : *PValue ; descr != NULL && count != MAX_PAGES_PER_EXTENT ; - PValue = JudyLNext(pg_cache->commited_page_index.JudyL_array, &Index, PJE0), + PValue = JudyLNext(pg_cache->committed_page_index.JudyL_array, &Index, PJE0), descr = unlikely(NULL == PValue) ? NULL : *PValue) { uint8_t page_write_pending; @@ -350,12 +354,11 @@ static int do_flush_pages(struct rrdengine_worker_config* wc, int force, struct rrdeng_page_descr_mutex_unlock(ctx, descr); if (page_write_pending) { - ret = JudyLDel(&pg_cache->commited_page_index.JudyL_array, Index, PJE0); + ret = JudyLDel(&pg_cache->committed_page_index.JudyL_array, Index, PJE0); assert(1 == ret); - --pg_cache->commited_page_index.nr_commited_pages; } } - uv_rwlock_wrunlock(&pg_cache->commited_page_index.lock); + uv_rwlock_wrunlock(&pg_cache->committed_page_index.lock); if (!count) { debug(D_RRDENGINE, "%s: no pages eligible for flushing.", __func__); @@ -648,6 +651,9 @@ void async_cb(uv_async_t *handle) debug(D_RRDENGINE, "%s called, active=%d.", __func__, uv_is_active((uv_handle_t *)handle)); } +/* Flushes dirty pages when timer expires */ +#define TIMER_PERIOD_MS (1000) + void timer_cb(uv_timer_t* handle) { struct rrdengine_worker_config* wc = handle->data; @@ -657,12 +663,31 @@ void timer_cb(uv_timer_t* handle) rrdeng_test_quota(wc); debug(D_RRDENGINE, "%s: timeout reached.", __func__); if (likely(!wc->now_deleting.data)) { - unsigned total_bytes, bytes_written; - /* There is free space so we can write to disk */ + struct rrdengine_instance *ctx = wc->ctx; + struct page_cache *pg_cache = &ctx->pg_cache; + unsigned long total_bytes, bytes_written, nr_committed_pages, bytes_to_write = 0, producers, low_watermark, + high_watermark; + + uv_rwlock_wrlock(&pg_cache->committed_page_index.lock); + nr_committed_pages = pg_cache->committed_page_index.nr_committed_pages; + uv_rwlock_wrunlock(&pg_cache->committed_page_index.lock); + producers = ctx->stats.metric_API_producers; + /* are flushable pages more than 25% of the maximum page cache size */ + high_watermark = (ctx->max_cache_pages * 25LLU) / 100; + low_watermark = (ctx->max_cache_pages * 5LLU) / 100; /* 5%, must be smaller than high_watermark */ + + if (nr_committed_pages > producers && + /* committed to be written pages are more than the produced number */ + nr_committed_pages - producers > high_watermark) { + /* Flushing speed must increase to stop page cache from filling with dirty pages */ + bytes_to_write = (nr_committed_pages - producers - low_watermark) * RRDENG_BLOCK_SIZE; + } + bytes_to_write = MAX(DATAFILE_IDEAL_IO_SIZE, bytes_to_write); + debug(D_RRDENGINE, "Flushing pages to disk."); for (total_bytes = bytes_written = do_flush_pages(wc, 0, NULL) ; - bytes_written && (total_bytes < DATAFILE_IDEAL_IO_SIZE) ; + bytes_written && (total_bytes < bytes_to_write) ; total_bytes += bytes_written) { bytes_written = do_flush_pages(wc, 0, NULL); } @@ -675,9 +700,6 @@ void timer_cb(uv_timer_t* handle) #endif } -/* Flushes dirty pages when timer expires */ -#define TIMER_PERIOD_MS (1000) - #define MAX_CMD_BATCH_SIZE (256) void rrdeng_worker(void* arg) @@ -771,8 +793,8 @@ void rrdeng_worker(void* arg) /* First I/O should be enough to call completion */ bytes_written = do_flush_pages(wc, 1, cmd.completion); if (bytes_written) { - while (do_flush_pages(wc, 1, NULL)) { - ; /* Force flushing of all commited pages. */ + while (do_flush_pages(wc, 1, NULL) && likely(!wc->now_deleting.data)) { + ; /* Force flushing of all committed pages if there is free space. */ } } break; @@ -789,7 +811,7 @@ void rrdeng_worker(void* arg) } info("Shutting down RRD engine event loop."); while (do_flush_pages(wc, 1, NULL)) { - ; /* Force flushing of all commited pages. */ + ; /* Force flushing of all committed pages. */ } wal_flush_transaction_buffer(wc); uv_run(loop, UV_RUN_DEFAULT); diff --git a/database/engine/rrdengine.h b/database/engine/rrdengine.h index 6f6a6f8ff..78a35a0bf 100644 --- a/database/engine/rrdengine.h +++ b/database/engine/rrdengine.h @@ -148,6 +148,7 @@ struct rrdengine_statistics { rrdeng_stats_t page_cache_descriptors; rrdeng_stats_t io_errors; rrdeng_stats_t fs_errors; + rrdeng_stats_t flushing_errors; }; /* I/O errors global counter */ @@ -156,6 +157,8 @@ extern rrdeng_stats_t global_io_errors; extern rrdeng_stats_t global_fs_errors; /* number of File-Descriptors that have been reserved by dbengine */ extern rrdeng_stats_t rrdeng_reserved_file_descriptors; +/* inability to flush global counter */ +extern rrdeng_stats_t global_flushing_errors; struct rrdengine_instance { struct rrdengine_worker_config worker_config; diff --git a/database/engine/rrdengineapi.c b/database/engine/rrdengineapi.c index 5fa23d8fd..baf4a9973 100644 --- a/database/engine/rrdengineapi.c +++ b/database/engine/rrdengineapi.c @@ -173,9 +173,9 @@ void rrdeng_store_metric_next(RRDDIM *rd, usec_t point_in_time, storage_number n handle->descr = descr; - uv_rwlock_wrlock(&pg_cache->commited_page_index.lock); - handle->page_correlation_id = pg_cache->commited_page_index.latest_corr_id++; - uv_rwlock_wrunlock(&pg_cache->commited_page_index.lock); + uv_rwlock_wrlock(&pg_cache->committed_page_index.lock); + handle->page_correlation_id = pg_cache->committed_page_index.latest_corr_id++; + uv_rwlock_wrunlock(&pg_cache->committed_page_index.lock); if (0 == rd->rrdset->rrddim_page_alignment) { /* this is the leading dimension that defines chart alignment */ @@ -614,18 +614,31 @@ void rrdeng_commit_page(struct rrdengine_instance *ctx, struct rrdeng_page_descr { struct page_cache *pg_cache = &ctx->pg_cache; Pvoid_t *PValue; + unsigned nr_committed_pages; if (unlikely(NULL == descr)) { - debug(D_RRDENGINE, "%s: page descriptor is NULL, page has already been force-commited.", __func__); + debug(D_RRDENGINE, "%s: page descriptor is NULL, page has already been force-committed.", __func__); return; } assert(descr->page_length); - uv_rwlock_wrlock(&pg_cache->commited_page_index.lock); - PValue = JudyLIns(&pg_cache->commited_page_index.JudyL_array, page_correlation_id, PJE0); + uv_rwlock_wrlock(&pg_cache->committed_page_index.lock); + PValue = JudyLIns(&pg_cache->committed_page_index.JudyL_array, page_correlation_id, PJE0); *PValue = descr; - ++pg_cache->commited_page_index.nr_commited_pages; - uv_rwlock_wrunlock(&pg_cache->commited_page_index.lock); + nr_committed_pages = ++pg_cache->committed_page_index.nr_committed_pages; + uv_rwlock_wrunlock(&pg_cache->committed_page_index.lock); + + if (nr_committed_pages >= (pg_cache_hard_limit(ctx) - (unsigned long)ctx->stats.metric_API_producers) / 2) { + /* 50% of pages have not been committed yet */ + if (0 == (unsigned long)ctx->stats.flushing_errors) { + /* only print the first time */ + error("Failed to flush quickly enough in dbengine instance \"%s\"" + ". Metric data will not be stored in the database" + ", please reduce disk load or use a faster disk.", ctx->dbfiles_path); + } + rrd_stat_atomic_add(&ctx->stats.flushing_errors, 1); + rrd_stat_atomic_add(&global_flushing_errors, 1); + } pg_cache_put(ctx, descr); } @@ -674,7 +687,7 @@ void *rrdeng_get_page(struct rrdengine_instance *ctx, uuid_t *id, usec_t point_i * You must not change the indices of the statistics or user code will break. * You must not exceed RRDENG_NR_STATS or it will crash. */ -void rrdeng_get_33_statistics(struct rrdengine_instance *ctx, unsigned long long *array) +void rrdeng_get_35_statistics(struct rrdengine_instance *ctx, unsigned long long *array) { struct page_cache *pg_cache = &ctx->pg_cache; @@ -682,7 +695,7 @@ void rrdeng_get_33_statistics(struct rrdengine_instance *ctx, unsigned long long array[1] = (uint64_t)ctx->stats.metric_API_consumers; array[2] = (uint64_t)pg_cache->page_descriptors; array[3] = (uint64_t)pg_cache->populated_pages; - array[4] = (uint64_t)pg_cache->commited_page_index.nr_commited_pages; + array[4] = (uint64_t)pg_cache->committed_page_index.nr_committed_pages; array[5] = (uint64_t)ctx->stats.pg_cache_insertions; array[6] = (uint64_t)ctx->stats.pg_cache_deletions; array[7] = (uint64_t)ctx->stats.pg_cache_hits; @@ -711,7 +724,9 @@ void rrdeng_get_33_statistics(struct rrdengine_instance *ctx, unsigned long long array[30] = (uint64_t)global_io_errors; array[31] = (uint64_t)global_fs_errors; array[32] = (uint64_t)rrdeng_reserved_file_descriptors; - assert(RRDENG_NR_STATS == 33); + array[33] = (uint64_t)ctx->stats.flushing_errors; + array[34] = (uint64_t)global_flushing_errors; + assert(RRDENG_NR_STATS == 35); } /* Releases reference to page */ diff --git a/database/engine/rrdengineapi.h b/database/engine/rrdengineapi.h index c876705e4..1ef0569d5 100644 --- a/database/engine/rrdengineapi.h +++ b/database/engine/rrdengineapi.h @@ -8,7 +8,7 @@ #define RRDENG_MIN_PAGE_CACHE_SIZE_MB (8) #define RRDENG_MIN_DISK_SPACE_MB (256) -#define RRDENG_NR_STATS (33) +#define RRDENG_NR_STATS (35) #define RRDENG_FD_BUDGET_PER_INSTANCE (50) @@ -41,7 +41,7 @@ extern int rrdeng_load_metric_is_finished(struct rrddim_query_handle *rrdimm_han extern void rrdeng_load_metric_finalize(struct rrddim_query_handle *rrdimm_handle); extern time_t rrdeng_metric_latest_time(RRDDIM *rd); extern time_t rrdeng_metric_oldest_time(RRDDIM *rd); -extern void rrdeng_get_33_statistics(struct rrdengine_instance *ctx, unsigned long long *array); +extern void rrdeng_get_35_statistics(struct rrdengine_instance *ctx, unsigned long long *array); /* must call once before using anything */ extern int rrdeng_init(struct rrdengine_instance **ctxp, char *dbfiles_path, unsigned page_cache_mb, diff --git a/database/engine/rrdenginelib.c b/database/engine/rrdenginelib.c index 1a04dc2a4..0606dd938 100644 --- a/database/engine/rrdenginelib.c +++ b/database/engine/rrdenginelib.c @@ -131,7 +131,7 @@ char *get_rrdeng_statistics(struct rrdengine_instance *ctx, char *str, size_t si "page_cache_total_pages: %ld\n" "page_cache_descriptors: %ld\n" "page_cache_populated_pages: %ld\n" - "page_cache_commited_pages: %ld\n" + "page_cache_committed_pages: %ld\n" "page_cache_insertions: %ld\n" "page_cache_deletions: %ld\n" "page_cache_hits: %ld\n" @@ -153,13 +153,20 @@ char *get_rrdeng_statistics(struct rrdengine_instance *ctx, char *str, size_t si "datafile_creations: %ld\n" "datafile_deletions: %ld\n" "journalfile_creations: %ld\n" - "journalfile_deletions: %ld\n", + "journalfile_deletions: %ld\n" + "io_errors: %ld\n" + "fs_errors: %ld\n" + "global_io_errors: %ld\n" + "global_fs_errors: %ld\n" + "rrdeng_reserved_file_descriptors: %ld\n" + "flushing_errors: %ld\n" + "global_flushing_errors: %ld\n", (long)ctx->stats.metric_API_producers, (long)ctx->stats.metric_API_consumers, (long)pg_cache->page_descriptors, (long)ctx->stats.page_cache_descriptors, (long)pg_cache->populated_pages, - (long)pg_cache->commited_page_index.nr_commited_pages, + (long)pg_cache->committed_page_index.nr_committed_pages, (long)ctx->stats.pg_cache_insertions, (long)ctx->stats.pg_cache_deletions, (long)ctx->stats.pg_cache_hits, @@ -181,7 +188,14 @@ char *get_rrdeng_statistics(struct rrdengine_instance *ctx, char *str, size_t si (long)ctx->stats.datafile_creations, (long)ctx->stats.datafile_deletions, (long)ctx->stats.journalfile_creations, - (long)ctx->stats.journalfile_deletions + (long)ctx->stats.journalfile_deletions, + (long)ctx->stats.io_errors, + (long)ctx->stats.fs_errors, + (long)global_io_errors, + (long)global_fs_errors, + (long)rrdeng_reserved_file_descriptors, + (long)ctx->stats.flushing_errors, + (long)global_flushing_errors ); return str; } diff --git a/database/rrd.h b/database/rrd.h index e335f0dd0..8efe2adb0 100644 --- a/database/rrd.h +++ b/database/rrd.h @@ -739,6 +739,7 @@ struct rrdhost { #ifdef ENABLE_HTTPS struct netdata_ssl ssl; //Structure used to encrypt the connection + struct netdata_ssl stream_ssl; //Structure used to encrypt the stream #endif struct rrdhost *next; diff --git a/database/rrdhost.c b/database/rrdhost.c index 9075787b0..bf540a209 100644 --- a/database/rrdhost.c +++ b/database/rrdhost.c @@ -150,6 +150,8 @@ RRDHOST *rrdhost_create(const char *hostname, #ifdef ENABLE_HTTPS host->ssl.conn = NULL; host->ssl.flags = NETDATA_SSL_START; + host->stream_ssl.conn = NULL; + host->stream_ssl.flags = NETDATA_SSL_START; #endif netdata_mutex_init(&host->rrdpush_sender_buffer_mutex); diff --git a/database/rrdset.c b/database/rrdset.c index e96d707be..0f5297030 100644 --- a/database/rrdset.c +++ b/database/rrdset.c @@ -1447,9 +1447,11 @@ void rrdset_done(RRDSET *st) { continue; } - // if the new is smaller than the old (an overflow, or reset), set the old equal to the new - // to reset the calculation (it will give zero as the calculation for this second) - if(unlikely(rd->last_collected_value > rd->collected_value)) { + // If the new is smaller than the old (an overflow, or reset), set the old equal to the new + // to reset the calculation (it will give zero as the calculation for this second). + // It is imperative to set the comparison to uint64_t since type collected_number is signed and + // produces wrong results as far as incremental counters are concerned. + if(unlikely((uint64_t)rd->last_collected_value > (uint64_t)rd->collected_value)) { debug(D_RRD_STATS, "%s.%s: RESET or OVERFLOW. Last collected value = " COLLECTED_NUMBER_FORMAT ", current = " COLLECTED_NUMBER_FORMAT , st->name, rd->name , rd->last_collected_value @@ -1463,17 +1465,29 @@ void rrdset_done(RRDSET *st) { uint64_t max = (uint64_t)rd->collected_value_max; uint64_t cap = 0; - if(max > 0x00000000FFFFFFFFULL) cap = 0xFFFFFFFFFFFFFFFFULL; - else if(max > 0x000000000000FFFFULL) cap = 0x00000000FFFFFFFFULL; - else if(max > 0x00000000000000FFULL) cap = 0x000000000000FFFFULL; - else cap = 0x00000000000000FFULL; + // Signed values are handled by exploiting two's complement which will produce positive deltas + if (max > 0x00000000FFFFFFFFULL) + cap = 0xFFFFFFFFFFFFFFFFULL; // handles signed and unsigned 64-bit counters + else + cap = 0x00000000FFFFFFFFULL; // handles signed and unsigned 32-bit counters uint64_t delta = cap - last + new; - - rd->calculated_value += - (calculated_number) delta - * (calculated_number) rd->multiplier - / (calculated_number) rd->divisor; + uint64_t max_acceptable_rate = (cap / 100) * MAX_INCREMENTAL_PERCENT_RATE; + + // If the delta is less than the maximum acceptable rate and the previous value was near the cap + // then this is an overflow. There can be false positives such that a reset is detected as an + // overflow. + // TODO: remember recent history of rates and compare with current rate to reduce this chance. + if (delta < max_acceptable_rate) { + rd->calculated_value += + (calculated_number) delta + * (calculated_number) rd->multiplier + / (calculated_number) rd->divisor; + } else { + // This is a reset. Any overflow with a rate greater than MAX_INCREMENTAL_PERCENT_RATE will also + // be detected as a reset instead. + rd->calculated_value += (calculated_number)0; + } } else { rd->calculated_value += |