enum switch_mode { SWITCH_ACTIVE, SWITCH_FLUSH };
/* channel: collection of per-cpu ring buffers. */
+#define RB_CHANNEL_PADDING 64
struct channel {
int record_disabled;
unsigned long commit_count_mask; /*
* be last member.
*/
struct channel_backend backend; /* Associated backend */
+ char padding[RB_CHANNEL_PADDING];
} __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 */
+ 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 */
+ char padding[RB_COMMIT_COUNT_COLD_PADDING];
} __attribute__((aligned(CAA_CACHE_LINE_SIZE)));
/* ring buffer state */
+#define RB_RING_BUFFER_PADDING 64
struct lttng_ust_lib_ring_buffer {
/* First 32 bytes cache-hot cacheline */
union v_atomic offset; /* Current offset in the buffer */
read_timer_enabled:1; /* Protected by ring_buffer_nohz_lock */
/* shmp pointer to self */
DECLARE_SHMP(struct lttng_ust_lib_ring_buffer, self);
+ char padding[RB_RING_BUFFER_PADDING];
} __attribute__((aligned(CAA_CACHE_LINE_SIZE)));
static inline