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-rw-r--r--database/engine/pagecache.h89
1 files changed, 60 insertions, 29 deletions
diff --git a/database/engine/pagecache.h b/database/engine/pagecache.h
index d1e29aaab..b5670f82a 100644
--- a/database/engine/pagecache.h
+++ b/database/engine/pagecache.h
@@ -5,9 +5,10 @@
#include "rrdengine.h"
-/* Forward declerations */
+/* Forward declarations */
struct rrdengine_instance;
struct extent_info;
+struct rrdeng_page_descr;
#define INVALID_TIME (0)
@@ -18,24 +19,46 @@ struct extent_info;
#define RRD_PAGE_WRITE_PENDING (1LU << 3)
#define RRD_PAGE_POPULATED (1LU << 4)
-struct rrdeng_page_cache_descr {
+struct page_cache_descr {
+ struct rrdeng_page_descr *descr; /* parent descriptor */
void *page;
- uint32_t page_length;
- usec_t start_time;
- usec_t end_time;
- uuid_t *id; /* never changes */
- struct extent_info *extent;
unsigned long flags;
- void *private;
- struct rrdeng_page_cache_descr *prev;
- struct rrdeng_page_cache_descr *next;
+ struct page_cache_descr *prev; /* LRU */
+ struct page_cache_descr *next; /* LRU */
- /* TODO: move waiter logic to concurrency table */
unsigned refcnt;
uv_mutex_t mutex; /* always take it after the page cache lock or after the commit lock */
uv_cond_t cond;
unsigned waiters;
- struct rrdeng_collect_handle *handle; /* API user */
+};
+
+/* Page cache descriptor flags, state = 0 means no descriptor */
+#define PG_CACHE_DESCR_ALLOCATED (1LU << 0)
+#define PG_CACHE_DESCR_DESTROY (1LU << 1)
+#define PG_CACHE_DESCR_LOCKED (1LU << 2)
+#define PG_CACHE_DESCR_SHIFT (3)
+#define PG_CACHE_DESCR_USERS_MASK (((unsigned long)-1) << PG_CACHE_DESCR_SHIFT)
+#define PG_CACHE_DESCR_FLAGS_MASK (((unsigned long)-1) >> (BITS_PER_ULONG - PG_CACHE_DESCR_SHIFT))
+
+/*
+ * Page cache descriptor state bits (works for both 32-bit and 64-bit architectures):
+ *
+ * 63 ... 31 ... 3 | 2 | 1 | 0|
+ * -----------------------------+------------+------------+-----------|
+ * number of descriptor users | DESTROY | LOCKED | ALLOCATED |
+ */
+struct rrdeng_page_descr {
+ uint32_t page_length;
+ usec_t start_time;
+ usec_t end_time;
+ uuid_t *id; /* never changes */
+ struct extent_info *extent;
+
+ /* points to ephemeral page cache descriptor if the page resides in the cache */
+ struct page_cache_descr *pg_cache_descr;
+
+ /* Compare-And-Swap target for page cache descriptor allocation algorithm */
+ volatile unsigned long pg_cache_descr_state;
};
#define PAGE_CACHE_MAX_PRELOAD_PAGES (256)
@@ -61,12 +84,15 @@ struct pg_cache_page_index {
* It's also written by the data deletion workqueue when data collection is disabled for this metric.
*/
usec_t latest_time;
+
+ struct pg_cache_page_index *prev;
};
/* maps UUIDs to page indices */
struct pg_cache_metrics_index {
uv_rwlock_t lock;
Pvoid_t JudyHS_array;
+ struct pg_cache_page_index *last_page_index;
};
/* gathers dirty pages to be written on disk */
@@ -85,12 +111,15 @@ struct pg_cache_commited_page_index {
unsigned nr_commited_pages;
};
-/* gathers populated pages to be evicted */
+/*
+ * Gathers populated pages to be evicted.
+ * Relies on page cache descriptors being there as it uses their memory.
+ */
struct pg_cache_replaceQ {
uv_rwlock_t lock; /* LRU lock */
- struct rrdeng_page_cache_descr *head; /* LRU */
- struct rrdeng_page_cache_descr *tail; /* MRU */
+ struct page_cache_descr *head; /* LRU */
+ struct page_cache_descr *tail; /* MRU */
};
struct page_cache { /* TODO: add statistics */
@@ -104,29 +133,31 @@ struct page_cache { /* TODO: add statistics */
unsigned populated_pages;
};
-extern void pg_cache_wake_up_waiters_unsafe(struct rrdeng_page_cache_descr *descr);
-extern void pg_cache_wait_event_unsafe(struct rrdeng_page_cache_descr *descr);
-extern unsigned long pg_cache_wait_event(struct rrdeng_page_cache_descr *descr);
+extern void pg_cache_wake_up_waiters_unsafe(struct rrdeng_page_descr *descr);
+extern void pg_cache_wait_event_unsafe(struct rrdeng_page_descr *descr);
+extern unsigned long pg_cache_wait_event(struct rrdengine_instance *ctx, struct rrdeng_page_descr *descr);
extern void pg_cache_replaceQ_insert(struct rrdengine_instance *ctx,
- struct rrdeng_page_cache_descr *descr);
+ struct rrdeng_page_descr *descr);
extern void pg_cache_replaceQ_delete(struct rrdengine_instance *ctx,
- struct rrdeng_page_cache_descr *descr);
+ struct rrdeng_page_descr *descr);
extern void pg_cache_replaceQ_set_hot(struct rrdengine_instance *ctx,
- struct rrdeng_page_cache_descr *descr);
-extern struct rrdeng_page_cache_descr *pg_cache_create_descr(void);
-extern void pg_cache_put_unsafe(struct rrdeng_page_cache_descr *descr);
-extern void pg_cache_put(struct rrdeng_page_cache_descr *descr);
+ struct rrdeng_page_descr *descr);
+extern struct rrdeng_page_descr *pg_cache_create_descr(void);
+extern int pg_cache_try_get_unsafe(struct rrdeng_page_descr *descr, int exclusive_access);
+extern void pg_cache_put_unsafe(struct rrdeng_page_descr *descr);
+extern void pg_cache_put(struct rrdengine_instance *ctx, struct rrdeng_page_descr *descr);
extern void pg_cache_insert(struct rrdengine_instance *ctx, struct pg_cache_page_index *index,
- struct rrdeng_page_cache_descr *descr);
-extern void pg_cache_punch_hole(struct rrdengine_instance *ctx, struct rrdeng_page_cache_descr *descr);
+ struct rrdeng_page_descr *descr);
+extern void pg_cache_punch_hole(struct rrdengine_instance *ctx, struct rrdeng_page_descr *descr, uint8_t remove_dirty);
extern struct pg_cache_page_index *
pg_cache_preload(struct rrdengine_instance *ctx, uuid_t *id, usec_t start_time, usec_t end_time);
-extern struct rrdeng_page_cache_descr *
+extern struct rrdeng_page_descr *
pg_cache_lookup(struct rrdengine_instance *ctx, struct pg_cache_page_index *index, uuid_t *id,
usec_t point_in_time);
extern struct pg_cache_page_index *create_page_index(uuid_t *id);
extern void init_page_cache(struct rrdengine_instance *ctx);
-extern void pg_cache_add_new_metric_time(struct pg_cache_page_index *page_index, struct rrdeng_page_cache_descr *descr);
+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);
-#endif /* NETDATA_PAGECACHE_H */ \ No newline at end of file
+#endif /* NETDATA_PAGECACHE_H */
generated by cgit v1.2.3 (git 2.39.1) at 2024-05-19 15:39:58 +0000