X-Git-Url: http://git.liburcu.org/?p=lttng-modules.git;a=blobdiff_plain;f=lib%2Fringbuffer%2Ffrontend_types.h;h=3fd634524f8ab9b59e59eed14f4adb6e169a4d5a;hp=d269c00a685221086448b249724326f6acc5b81f;hb=5b4ea313ddc10d96388a20a42e118c758479a553;hpb=f3bc08c50e1b302bceea699027d889fd6d9af525 diff --git a/lib/ringbuffer/frontend_types.h b/lib/ringbuffer/frontend_types.h index d269c00a..3fd63452 100644 --- a/lib/ringbuffer/frontend_types.h +++ b/lib/ringbuffer/frontend_types.h @@ -1,24 +1,22 @@ -#ifndef _LINUX_RING_BUFFER_FRONTEND_TYPES_H -#define _LINUX_RING_BUFFER_FRONTEND_TYPES_H - -/* - * linux/ringbuffer/frontend_types.h +/* SPDX-License-Identifier: (GPL-2.0-only OR LGPL-2.1-only) * - * (C) Copyright 2005-2010 - Mathieu Desnoyers + * lib/ringbuffer/frontend_types.h * * Ring Buffer Library Synchronization Header (types). * - * Author: - * Mathieu Desnoyers + * Copyright (C) 2010-2012 Mathieu Desnoyers * * See ring_buffer_frontend.c for more information on wait-free algorithms. - * - * Dual LGPL v2.1/GPL v2 license. */ -#include "../../wrapper/ringbuffer/config.h" -#include "../../wrapper/ringbuffer/backend_types.h" -#include "../../wrapper/prio_heap.h" /* For per-CPU read-side iterator */ +#ifndef _LIB_RING_BUFFER_FRONTEND_TYPES_H +#define _LIB_RING_BUFFER_FRONTEND_TYPES_H + +#include +#include +#include +#include /* For per-CPU read-side iterator */ +#include /* * A switch is done during tracing or as a final flush after tracing (so it @@ -29,7 +27,7 @@ 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 ptr_heap heap; /* Heap of struct lib_ring_buffer ptrs */ + 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 */ @@ -55,14 +53,22 @@ struct channel { unsigned long switch_timer_interval; /* Buffer flush (jiffies) */ unsigned long read_timer_interval; /* Reader wakeup (jiffies) */ +#if (LINUX_VERSION_CODE >= KERNEL_VERSION(4,10,0)) + struct lttng_cpuhp_node cpuhp_prepare; + struct lttng_cpuhp_node cpuhp_online; + struct lttng_cpuhp_node cpuhp_iter_online; +#else 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. */ + unsigned int cpu_hp_enable:1; /* Enable CPU hotplug notif. */ + unsigned int hp_iter_enable:1; /* Enable hp iter notif. */ +#endif + struct notifier_block tick_nohz_notifier; /* CPU nohz notifier */ wait_queue_head_t read_wait; /* reader wait queue */ + wait_queue_head_t hp_wait; /* CPU hotplug wait queue */ + int finalized; /* Has channel been finalized */ struct channel_iter iter; /* Channel read-side iterator */ - atomic_long_t read_ref; /* Reader reference count */ + struct kref ref; /* Reference count */ }; /* Per-subbuffer commit counters used on the hot path */ @@ -90,8 +96,8 @@ struct lib_ring_buffer_iter { ITER_NEXT_RECORD, ITER_PUT_SUBBUF, } state; - int allocated:1; - int read_open:1; /* Opened for reading ? */ + unsigned int allocated:1; + unsigned int read_open:1; /* Opened for reading ? */ }; /* ring buffer state */ @@ -114,6 +120,20 @@ struct lib_ring_buffer { struct commit_counters_cold *commit_cold; /* Commit count per sub-buffer */ + u64 *ts_end; /* + * timestamp_end per sub-buffer. + * Time is sampled by the + * switch_*_end() callbacks which + * are the last space reservation + * performed in the sub-buffer + * before it can be fully + * committed and delivered. This + * time value is then read by + * the deliver callback, + * performed by the last commit + * before the buffer becomes + * readable. + */ atomic_long_t active_readers; /* * Active readers count * standard atomic access (shared) @@ -125,6 +145,7 @@ struct lib_ring_buffer { 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 write_wait; /* writer buffer-level wait queue (for metadata only) */ int finalized; /* buffer has been finalized */ struct timer_list switch_timer; /* timer for periodical switch */ struct timer_list read_timer; /* timer for read poll */ @@ -133,11 +154,20 @@ struct lib_ring_buffer { 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 */ + unsigned int get_subbuf:1, /* Sub-buffer being held by reader */ + switch_timer_enabled:1, /* Protected by ring_buffer_nohz_lock */ + read_timer_enabled:1, /* Protected by ring_buffer_nohz_lock */ + quiescent:1; }; +static inline +void *channel_get_private(struct channel *chan) +{ + return chan->backend.priv; +} + +void lib_ring_buffer_lost_event_too_big(struct channel *chan); + /* * Issue warnings and disable channels upon internal error. * Can receive struct lib_ring_buffer or struct lib_ring_buffer_backend @@ -162,4 +192,4 @@ struct lib_ring_buffer { _____ret; \ }) -#endif /* _LINUX_RING_BUFFER_FRONTEND_TYPES_H */ +#endif /* _LIB_RING_BUFFER_FRONTEND_TYPES_H */