X-Git-Url: http://git.liburcu.org/?a=blobdiff_plain;f=libringbuffer%2Ffrontend_types.h;h=d0890408eb9bfa4965fda6f1326d00693530a6d8;hb=6c737d0594cac0d969e1948ea1ed55c15be9cec8;hp=93131616f613050d3a7c0707ce486219ec6fc85f;hpb=a3f61e7f689a5fc60b833a773f462989dc6cc78f;p=lttng-ust.git diff --git a/libringbuffer/frontend_types.h b/libringbuffer/frontend_types.h index 93131616..d0890408 100644 --- a/libringbuffer/frontend_types.h +++ b/libringbuffer/frontend_types.h @@ -1,32 +1,45 @@ -#ifndef _LINUX_RING_BUFFER_FRONTEND_TYPES_H -#define _LINUX_RING_BUFFER_FRONTEND_TYPES_H +#ifndef _LTTNG_RING_BUFFER_FRONTEND_TYPES_H +#define _LTTNG_RING_BUFFER_FRONTEND_TYPES_H /* - * linux/ringbuffer/frontend_types.h - * - * (C) Copyright 2005-2010 - Mathieu Desnoyers + * libringbuffer/frontend_types.h * * Ring Buffer Library Synchronization Header (types). * + * Copyright (C) 2005-2012 Mathieu Desnoyers + * + * This library is free software; you can redistribute it and/or + * modify it under the terms of the GNU Lesser General Public + * License as published by the Free Software Foundation; only + * version 2.1 of the License. + * + * This library is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * Lesser General Public License for more details. + * + * You should have received a copy of the GNU Lesser General Public + * License along with this library; if not, write to the Free Software + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA + * * Author: * Mathieu Desnoyers * * See ring_buffer_frontend.c for more information on wait-free algorithms. - * - * Dual LGPL v2.1/GPL v2 license. */ #include +#include /* for timer_t */ #include #include -#include "lttng/core.h" - -#include #include +#include #include "backend_types.h" #include "shm_internal.h" +#include "shm_types.h" +#include "vatomic.h" /* * A switch is done during tracing or as a final flush after tracing (so it @@ -35,6 +48,7 @@ enum switch_mode { SWITCH_ACTIVE, SWITCH_FLUSH }; /* channel: collection of per-cpu ring buffers. */ +#define RB_CHANNEL_PADDING 32 struct channel { int record_disabled; unsigned long commit_count_mask; /* @@ -44,33 +58,132 @@ struct channel { * subbuffer index. */ - unsigned long switch_timer_interval; /* Buffer flush (jiffies) */ - unsigned long read_timer_interval; /* Reader wakeup (jiffies) */ - //wait_queue_head_t read_wait; /* reader wait queue */ + unsigned long switch_timer_interval; /* Buffer flush (us) */ + timer_t switch_timer; + int switch_timer_enabled; + + unsigned long read_timer_interval; /* Reader wakeup (us) */ + timer_t read_timer; + int read_timer_enabled; + int finalized; /* Has channel been finalized */ size_t priv_data_offset; + unsigned int nr_streams; /* Number of streams */ + struct lttng_ust_shm_handle *handle; + /* Extended options. */ + union { + struct { + int32_t blocking_timeout_ms; + } s; + char padding[RB_CHANNEL_PADDING]; + } u; /* * Associated backend contains a variable-length array. Needs to * be last member. */ struct channel_backend backend; /* Associated backend */ -} ____cacheline_aligned; +} __attribute__((aligned(CAA_CACHE_LINE_SIZE))); /* Per-subbuffer commit counters used on the hot path */ +#define RB_COMMIT_COUNT_HOT_PADDING 16 struct commit_counters_hot { union v_atomic cc; /* Commit counter */ union v_atomic seq; /* Consecutive commits */ -} ____cacheline_aligned; + char padding[RB_COMMIT_COUNT_HOT_PADDING]; +} __attribute__((aligned(CAA_CACHE_LINE_SIZE))); /* Per-subbuffer commit counters used only on cold paths */ +#define RB_COMMIT_COUNT_COLD_PADDING 24 struct commit_counters_cold { union v_atomic cc_sb; /* Incremented _once_ at sb switch */ -} ____cacheline_aligned; + char padding[RB_COMMIT_COUNT_COLD_PADDING]; +} __attribute__((aligned(CAA_CACHE_LINE_SIZE))); /* ring buffer state */ +#define RB_CRASH_DUMP_ABI_LEN 256 +#define RB_RING_BUFFER_PADDING 60 + +#define RB_CRASH_DUMP_ABI_MAGIC_LEN 16 + +/* + * The 128-bit magic number is xor'd in the process data so it does not + * cause a false positive when searching for buffers by scanning memory. + * The actual magic number is: + * 0x17, 0x7B, 0xF1, 0x77, 0xBF, 0x17, 0x7B, 0xF1, + * 0x77, 0xBF, 0x17, 0x7B, 0xF1, 0x77, 0xBF, 0x17, + */ +#define RB_CRASH_DUMP_ABI_MAGIC_XOR \ + { \ + 0x17 ^ 0xFF, 0x7B ^ 0xFF, 0xF1 ^ 0xFF, 0x77 ^ 0xFF, \ + 0xBF ^ 0xFF, 0x17 ^ 0xFF, 0x7B ^ 0xFF, 0xF1 ^ 0xFF, \ + 0x77 ^ 0xFF, 0xBF ^ 0xFF, 0x17 ^ 0xFF, 0x7B ^ 0xFF, \ + 0xF1 ^ 0xFF, 0x77 ^ 0xFF, 0xBF ^ 0xFF, 0x17 ^ 0xFF, \ + } + +#define RB_CRASH_ENDIAN 0x1234 + +#define RB_CRASH_DUMP_ABI_MAJOR 0 +#define RB_CRASH_DUMP_ABI_MINOR 0 + +enum lttng_crash_type { + LTTNG_CRASH_TYPE_UST = 0, + LTTNG_CRASH_TYPE_KERNEL = 1, +}; + +struct lttng_crash_abi { + uint8_t magic[RB_CRASH_DUMP_ABI_MAGIC_LEN]; + uint64_t mmap_length; /* Overall lenght of crash record */ + uint16_t endian; /* + * { 0x12, 0x34 }: big endian + * { 0x34, 0x12 }: little endian + */ + uint16_t major; /* Major number. */ + uint16_t minor; /* Minor number. */ + uint8_t word_size; /* Word size (bytes). */ + uint8_t layout_type; /* enum lttng_crash_type */ + + struct { + uint32_t prod_offset; + uint32_t consumed_offset; + uint32_t commit_hot_array; + uint32_t commit_hot_seq; + uint32_t buf_wsb_array; + uint32_t buf_wsb_id; + uint32_t sb_array; + uint32_t sb_array_shmp_offset; + uint32_t sb_backend_p_offset; + uint32_t content_size; + uint32_t packet_size; + } __attribute__((packed)) offset; + struct { + uint8_t prod_offset; + uint8_t consumed_offset; + uint8_t commit_hot_seq; + uint8_t buf_wsb_id; + uint8_t sb_array_shmp_offset; + uint8_t sb_backend_p_offset; + uint8_t content_size; + uint8_t packet_size; + } __attribute__((packed)) length; + struct { + uint32_t commit_hot_array; + uint32_t buf_wsb_array; + uint32_t sb_array; + } __attribute__((packed)) stride; + + uint64_t buf_size; /* Size of the buffer */ + uint64_t subbuf_size; /* Sub-buffer size */ + uint64_t num_subbuf; /* Number of sub-buffers for writer */ + uint32_t mode; /* Buffer mode: 0: overwrite, 1: discard */ +} __attribute__((packed)); + struct lttng_ust_lib_ring_buffer { - /* First 32 bytes cache-hot cacheline */ - union v_atomic offset; /* Current offset in the buffer */ + /* First 32 bytes are for the buffer crash dump ABI */ + struct lttng_crash_abi crash_abi; + + /* 32 bytes cache-hot cacheline */ + union v_atomic __attribute__((aligned(32))) offset; + /* Current offset in the buffer */ DECLARE_SHMP(struct commit_counters_hot, commit_hot); /* Commit count per sub-buffer */ long consumed; /* @@ -78,20 +191,35 @@ struct lttng_ust_lib_ring_buffer { * standard atomic access (shared) */ int record_disabled; - /* End of first 32 bytes cacheline */ + /* End of cache-hot 32 bytes cacheline */ + union v_atomic last_tsc; /* * Last timestamp written in the buffer. */ - struct lttng_ust_lib_ring_buffer_backend backend; /* Associated backend */ + struct lttng_ust_lib_ring_buffer_backend backend; + /* Associated backend */ DECLARE_SHMP(struct commit_counters_cold, commit_cold); /* Commit count per sub-buffer */ + DECLARE_SHMP(uint64_t, 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. + */ 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 */ @@ -100,17 +228,14 @@ struct lttng_ust_lib_ring_buffer { union v_atomic records_overrun; /* Number of overwritten records */ //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 */ 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 */ /* shmp pointer to self */ DECLARE_SHMP(struct lttng_ust_lib_ring_buffer, self); -} ____cacheline_aligned; + char padding[RB_RING_BUFFER_PADDING]; +} __attribute__((aligned(CAA_CACHE_LINE_SIZE))); static inline void *channel_get_private(struct channel *chan) @@ -118,6 +243,10 @@ void *channel_get_private(struct channel *chan) return ((char *) chan) + chan->priv_data_offset; } +#ifndef __rb_same_type +#define __rb_same_type(a, b) __builtin_types_compatible_p(typeof(a), typeof(b)) +#endif + /* * Issue warnings and disable channels upon internal error. * Can receive struct lttng_ust_lib_ring_buffer or struct lttng_ust_lib_ring_buffer_backend @@ -128,18 +257,18 @@ void *channel_get_private(struct channel *chan) struct channel *__chan; \ int _____ret = caa_unlikely(cond); \ if (_____ret) { \ - if (__same_type(*(c), struct channel_backend)) \ + if (__rb_same_type(*(c), struct channel_backend)) \ __chan = caa_container_of((void *) (c), \ struct channel, \ backend); \ - else if (__same_type(*(c), struct channel)) \ + else if (__rb_same_type(*(c), struct channel)) \ __chan = (void *) (c); \ else \ BUG_ON(1); \ uatomic_inc(&__chan->record_disabled); \ WARN_ON(1); \ } \ - _____ret; \ + _____ret = _____ret; /* For clang "unused result". */ \ }) -#endif /* _LINUX_RING_BUFFER_FRONTEND_TYPES_H */ +#endif /* _LTTNG_RING_BUFFER_FRONTEND_TYPES_H */