73a757e631
When reading the ring buffer for consuming, it is optimized for splice, where a page is taken out of the ring buffer (zero copy) and sent to the reading consumer. When the read is finished with the page, it calls ring_buffer_free_read_page(), which simply frees the page. The next time the reader needs to get a page from the ring buffer, it must call ring_buffer_alloc_read_page() which allocates and initializes a reader page for the ring buffer to be swapped into the ring buffer for a new filled page for the reader. The problem is that there's no reason to actually free the page when it is passed back to the ring buffer. It can hold it off and reuse it for the next iteration. This completely removes the interaction with the page_alloc mechanism. Using the trace-cmd utility to record all events (causing trace-cmd to require reading lots of pages from the ring buffer, and calling ring_buffer_alloc/free_read_page() several times), and also assigning a stack trace trigger to the mm_page_alloc event, we can see how many times the ring_buffer_alloc_read_page() needed to allocate a page for the ring buffer. Before this change: # trace-cmd record -e all -e mem_page_alloc -R stacktrace sleep 1 # trace-cmd report |grep ring_buffer_alloc_read_page | wc -l 9968 After this change: # trace-cmd record -e all -e mem_page_alloc -R stacktrace sleep 1 # trace-cmd report |grep ring_buffer_alloc_read_page | wc -l 4 Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
208 lines
6.8 KiB
C
208 lines
6.8 KiB
C
#ifndef _LINUX_RING_BUFFER_H
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#define _LINUX_RING_BUFFER_H
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#include <linux/kmemcheck.h>
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#include <linux/mm.h>
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#include <linux/seq_file.h>
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#include <linux/poll.h>
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struct ring_buffer;
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struct ring_buffer_iter;
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/*
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* Don't refer to this struct directly, use functions below.
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*/
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struct ring_buffer_event {
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kmemcheck_bitfield_begin(bitfield);
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u32 type_len:5, time_delta:27;
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kmemcheck_bitfield_end(bitfield);
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u32 array[];
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};
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/**
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* enum ring_buffer_type - internal ring buffer types
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*
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* @RINGBUF_TYPE_PADDING: Left over page padding or discarded event
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* If time_delta is 0:
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* array is ignored
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* size is variable depending on how much
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* padding is needed
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* If time_delta is non zero:
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* array[0] holds the actual length
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* size = 4 + length (bytes)
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*
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* @RINGBUF_TYPE_TIME_EXTEND: Extend the time delta
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* array[0] = time delta (28 .. 59)
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* size = 8 bytes
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*
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* @RINGBUF_TYPE_TIME_STAMP: Sync time stamp with external clock
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* array[0] = tv_nsec
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* array[1..2] = tv_sec
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* size = 16 bytes
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*
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* <= @RINGBUF_TYPE_DATA_TYPE_LEN_MAX:
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* Data record
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* If type_len is zero:
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* array[0] holds the actual length
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* array[1..(length+3)/4] holds data
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* size = 4 + length (bytes)
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* else
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* length = type_len << 2
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* array[0..(length+3)/4-1] holds data
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* size = 4 + length (bytes)
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*/
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enum ring_buffer_type {
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RINGBUF_TYPE_DATA_TYPE_LEN_MAX = 28,
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RINGBUF_TYPE_PADDING,
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RINGBUF_TYPE_TIME_EXTEND,
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/* FIXME: RINGBUF_TYPE_TIME_STAMP not implemented */
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RINGBUF_TYPE_TIME_STAMP,
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};
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unsigned ring_buffer_event_length(struct ring_buffer_event *event);
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void *ring_buffer_event_data(struct ring_buffer_event *event);
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/*
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* ring_buffer_discard_commit will remove an event that has not
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* ben committed yet. If this is used, then ring_buffer_unlock_commit
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* must not be called on the discarded event. This function
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* will try to remove the event from the ring buffer completely
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* if another event has not been written after it.
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*
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* Example use:
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*
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* if (some_condition)
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* ring_buffer_discard_commit(buffer, event);
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* else
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* ring_buffer_unlock_commit(buffer, event);
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*/
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void ring_buffer_discard_commit(struct ring_buffer *buffer,
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struct ring_buffer_event *event);
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/*
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* size is in bytes for each per CPU buffer.
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*/
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struct ring_buffer *
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__ring_buffer_alloc(unsigned long size, unsigned flags, struct lock_class_key *key);
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/*
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* Because the ring buffer is generic, if other users of the ring buffer get
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* traced by ftrace, it can produce lockdep warnings. We need to keep each
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* ring buffer's lock class separate.
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*/
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#define ring_buffer_alloc(size, flags) \
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({ \
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static struct lock_class_key __key; \
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__ring_buffer_alloc((size), (flags), &__key); \
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})
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int ring_buffer_wait(struct ring_buffer *buffer, int cpu, bool full);
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int ring_buffer_poll_wait(struct ring_buffer *buffer, int cpu,
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struct file *filp, poll_table *poll_table);
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#define RING_BUFFER_ALL_CPUS -1
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void ring_buffer_free(struct ring_buffer *buffer);
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int ring_buffer_resize(struct ring_buffer *buffer, unsigned long size, int cpu);
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void ring_buffer_change_overwrite(struct ring_buffer *buffer, int val);
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struct ring_buffer_event *ring_buffer_lock_reserve(struct ring_buffer *buffer,
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unsigned long length);
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int ring_buffer_unlock_commit(struct ring_buffer *buffer,
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struct ring_buffer_event *event);
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int ring_buffer_write(struct ring_buffer *buffer,
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unsigned long length, void *data);
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struct ring_buffer_event *
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ring_buffer_peek(struct ring_buffer *buffer, int cpu, u64 *ts,
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unsigned long *lost_events);
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struct ring_buffer_event *
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ring_buffer_consume(struct ring_buffer *buffer, int cpu, u64 *ts,
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unsigned long *lost_events);
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struct ring_buffer_iter *
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ring_buffer_read_prepare(struct ring_buffer *buffer, int cpu);
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void ring_buffer_read_prepare_sync(void);
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void ring_buffer_read_start(struct ring_buffer_iter *iter);
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void ring_buffer_read_finish(struct ring_buffer_iter *iter);
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struct ring_buffer_event *
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ring_buffer_iter_peek(struct ring_buffer_iter *iter, u64 *ts);
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struct ring_buffer_event *
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ring_buffer_read(struct ring_buffer_iter *iter, u64 *ts);
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void ring_buffer_iter_reset(struct ring_buffer_iter *iter);
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int ring_buffer_iter_empty(struct ring_buffer_iter *iter);
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unsigned long ring_buffer_size(struct ring_buffer *buffer, int cpu);
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void ring_buffer_reset_cpu(struct ring_buffer *buffer, int cpu);
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void ring_buffer_reset(struct ring_buffer *buffer);
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#ifdef CONFIG_RING_BUFFER_ALLOW_SWAP
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int ring_buffer_swap_cpu(struct ring_buffer *buffer_a,
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struct ring_buffer *buffer_b, int cpu);
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#else
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static inline int
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ring_buffer_swap_cpu(struct ring_buffer *buffer_a,
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struct ring_buffer *buffer_b, int cpu)
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{
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return -ENODEV;
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}
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#endif
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bool ring_buffer_empty(struct ring_buffer *buffer);
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bool ring_buffer_empty_cpu(struct ring_buffer *buffer, int cpu);
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void ring_buffer_record_disable(struct ring_buffer *buffer);
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void ring_buffer_record_enable(struct ring_buffer *buffer);
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void ring_buffer_record_off(struct ring_buffer *buffer);
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void ring_buffer_record_on(struct ring_buffer *buffer);
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int ring_buffer_record_is_on(struct ring_buffer *buffer);
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void ring_buffer_record_disable_cpu(struct ring_buffer *buffer, int cpu);
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void ring_buffer_record_enable_cpu(struct ring_buffer *buffer, int cpu);
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u64 ring_buffer_oldest_event_ts(struct ring_buffer *buffer, int cpu);
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unsigned long ring_buffer_bytes_cpu(struct ring_buffer *buffer, int cpu);
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unsigned long ring_buffer_entries(struct ring_buffer *buffer);
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unsigned long ring_buffer_overruns(struct ring_buffer *buffer);
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unsigned long ring_buffer_entries_cpu(struct ring_buffer *buffer, int cpu);
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unsigned long ring_buffer_overrun_cpu(struct ring_buffer *buffer, int cpu);
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unsigned long ring_buffer_commit_overrun_cpu(struct ring_buffer *buffer, int cpu);
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unsigned long ring_buffer_dropped_events_cpu(struct ring_buffer *buffer, int cpu);
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unsigned long ring_buffer_read_events_cpu(struct ring_buffer *buffer, int cpu);
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u64 ring_buffer_time_stamp(struct ring_buffer *buffer, int cpu);
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void ring_buffer_normalize_time_stamp(struct ring_buffer *buffer,
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int cpu, u64 *ts);
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void ring_buffer_set_clock(struct ring_buffer *buffer,
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u64 (*clock)(void));
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size_t ring_buffer_page_len(void *page);
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void *ring_buffer_alloc_read_page(struct ring_buffer *buffer, int cpu);
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void ring_buffer_free_read_page(struct ring_buffer *buffer, int cpu, void *data);
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int ring_buffer_read_page(struct ring_buffer *buffer, void **data_page,
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size_t len, int cpu, int full);
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struct trace_seq;
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int ring_buffer_print_entry_header(struct trace_seq *s);
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int ring_buffer_print_page_header(struct trace_seq *s);
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enum ring_buffer_flags {
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RB_FL_OVERWRITE = 1 << 0,
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};
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#ifdef CONFIG_RING_BUFFER
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int trace_rb_cpu_prepare(unsigned int cpu, struct hlist_node *node);
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#else
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#define trace_rb_cpu_prepare NULL
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#endif
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#endif /* _LINUX_RING_BUFFER_H */
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