X-Git-Url: https://git.liburcu.org/?a=blobdiff_plain;f=libringbuffer%2Ffrontend_types.h;h=84593260c4f7b7ef941708d9fd0347881165efe1;hb=b5a3dfa5923801ddeea22ce70758d1e61200eac2;hp=f89d803cefacb59542b6e1f095e2ac8c0aa93950;hpb=4931a13e87ddbbabe4911e622e78c85b2197ecbf;p=ust.git diff --git a/libringbuffer/frontend_types.h b/libringbuffer/frontend_types.h index f89d803..8459326 100644 --- a/libringbuffer/frontend_types.h +++ b/libringbuffer/frontend_types.h @@ -16,9 +16,17 @@ * Dual LGPL v2.1/GPL v2 license. */ -#include "config.h" +#include + +#include +#include + +#include "ust/core.h" + +#include +#include #include "backend_types.h" -#include "../lib_prio_heap/lttng_prio_heap.h" /* For per-CPU read-side iterator */ +#include "shm_internal.h" /* * A switch is done during tracing or as a final flush after tracing (so it @@ -26,24 +34,9 @@ */ enum switch_mode { SWITCH_ACTIVE, SWITCH_FLUSH }; -/* channel-level read-side iterator */ -struct channel_iter { - /* Prio heap of buffers. Lowest timestamps at the top. */ - struct lttng_ptr_heap heap; /* Heap of struct lib_ring_buffer ptrs */ - struct list_head empty_head; /* Empty buffers linked-list head */ - int read_open; /* Opened for reading ? */ - u64 last_qs; /* Last quiescent state timestamp */ - u64 last_timestamp; /* Last timestamp (for WARN_ON) */ - int last_cpu; /* Last timestamp cpu */ - /* - * read() file operation state. - */ - unsigned long len_left; -}; - /* channel: collection of per-cpu ring buffers. */ struct channel { - atomic_t record_disabled; + int record_disabled; unsigned long commit_count_mask; /* * Commit count mask, removing * the MSBs corresponding to @@ -51,94 +44,72 @@ struct channel { * subbuffer index. */ - struct channel_backend backend; /* Associated backend */ - unsigned long switch_timer_interval; /* Buffer flush (jiffies) */ unsigned long read_timer_interval; /* Reader wakeup (jiffies) */ - struct notifier_block cpu_hp_notifier; /* CPU hotplug notifier */ - struct notifier_block tick_nohz_notifier; /* CPU nohz notifier */ - struct notifier_block hp_iter_notifier; /* hotplug iterator notifier */ - int cpu_hp_enable:1; /* Enable CPU hotplug notif. */ - int hp_iter_enable:1; /* Enable hp iter notif. */ - wait_queue_head_t read_wait; /* reader wait queue */ - wait_queue_head_t hp_wait; /* CPU hotplug wait queue */ + //wait_queue_head_t read_wait; /* reader wait queue */ int finalized; /* Has channel been finalized */ - struct channel_iter iter; /* Channel read-side iterator */ - struct kref ref; /* Reference count */ -}; + /* + * Associated backend contains a variable-length array. Needs to + * be last member. + */ + struct channel_backend backend; /* Associated backend */ +} ____cacheline_aligned; /* Per-subbuffer commit counters used on the hot path */ struct commit_counters_hot { union v_atomic cc; /* Commit counter */ union v_atomic seq; /* Consecutive commits */ -}; +} ____cacheline_aligned; /* Per-subbuffer commit counters used only on cold paths */ struct commit_counters_cold { union v_atomic cc_sb; /* Incremented _once_ at sb switch */ -}; - -/* Per-buffer read iterator */ -struct lib_ring_buffer_iter { - u64 timestamp; /* Current record timestamp */ - size_t header_len; /* Current record header length */ - size_t payload_len; /* Current record payload length */ - - struct list_head empty_node; /* Linked list of empty buffers */ - unsigned long consumed, read_offset, data_size; - enum { - ITER_GET_SUBBUF = 0, - ITER_TEST_RECORD, - ITER_NEXT_RECORD, - ITER_PUT_SUBBUF, - } state; - int allocated:1; - int read_open:1; /* Opened for reading ? */ -}; +} ____cacheline_aligned; /* ring buffer state */ -struct lib_ring_buffer { +struct lttng_ust_lib_ring_buffer { /* First 32 bytes cache-hot cacheline */ union v_atomic offset; /* Current offset in the buffer */ - struct commit_counters_hot *commit_hot; + DECLARE_SHMP(struct commit_counters_hot, commit_hot); /* Commit count per sub-buffer */ - atomic_long_t consumed; /* + long consumed; /* * Current offset in the buffer * standard atomic access (shared) */ - atomic_t record_disabled; + int record_disabled; /* End of first 32 bytes cacheline */ union v_atomic last_tsc; /* * Last timestamp written in the buffer. */ - struct lib_ring_buffer_backend backend; /* Associated backend */ + struct lttng_ust_lib_ring_buffer_backend backend; /* Associated backend */ - struct commit_counters_cold *commit_cold; + DECLARE_SHMP(struct commit_counters_cold, commit_cold); /* Commit count per sub-buffer */ - atomic_long_t active_readers; /* + long active_readers; /* * Active readers count * standard atomic access (shared) */ + long active_shadow_readers; /* Dropped records */ union v_atomic records_lost_full; /* Buffer full */ union v_atomic records_lost_wrap; /* Nested wrap-around */ union v_atomic records_lost_big; /* Events too big */ union v_atomic records_count; /* Number of records written */ union v_atomic records_overrun; /* Number of overwritten records */ - wait_queue_head_t read_wait; /* reader buffer-level wait queue */ + //wait_queue_head_t read_wait; /* reader buffer-level wait queue */ int finalized; /* buffer has been finalized */ - struct timer_list switch_timer; /* timer for periodical switch */ - struct timer_list read_timer; /* timer for read poll */ - raw_spinlock_t raw_tick_nohz_spinlock; /* nohz entry lock/trylock */ - struct lib_ring_buffer_iter iter; /* read-side iterator */ + //struct timer_list switch_timer; /* timer for periodical switch */ + //struct timer_list read_timer; /* timer for read poll */ unsigned long get_subbuf_consumed; /* Read-side consumed */ unsigned long prod_snapshot; /* Producer count snapshot */ unsigned long cons_snapshot; /* Consumer count snapshot */ int get_subbuf:1; /* Sub-buffer being held by reader */ int switch_timer_enabled:1; /* Protected by ring_buffer_nohz_lock */ int read_timer_enabled:1; /* Protected by ring_buffer_nohz_lock */ -}; + /* shmp pointer to self */ + DECLARE_SHMP(struct lttng_ust_lib_ring_buffer, self); +} ____cacheline_aligned; static inline void *channel_get_private(struct channel *chan) @@ -148,23 +119,23 @@ void *channel_get_private(struct channel *chan) /* * Issue warnings and disable channels upon internal error. - * Can receive struct lib_ring_buffer or struct lib_ring_buffer_backend + * Can receive struct lttng_ust_lib_ring_buffer or struct lttng_ust_lib_ring_buffer_backend * parameters. */ #define CHAN_WARN_ON(c, cond) \ ({ \ struct channel *__chan; \ - int _____ret = unlikely(cond); \ + int _____ret = caa_unlikely(cond); \ if (_____ret) { \ if (__same_type(*(c), struct channel_backend)) \ - __chan = container_of((void *) (c), \ + __chan = caa_container_of((void *) (c), \ struct channel, \ backend); \ else if (__same_type(*(c), struct channel)) \ __chan = (void *) (c); \ else \ BUG_ON(1); \ - atomic_inc(&__chan->record_disabled); \ + uatomic_inc(&__chan->record_disabled); \ WARN_ON(1); \ } \ _____ret; \