forked from Minki/linux
51255a8af7
Implemented mmap data buffer that is used as the memory to operate on when compressing data in case of serial trace streaming. Signed-off-by: Alexey Budankov <alexey.budankov@linux.intel.com> Reviewed-by: Jiri Olsa <jolsa@kernel.org> Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com> Cc: Andi Kleen <ak@linux.intel.com> Cc: Namhyung Kim <namhyung@kernel.org> Cc: Peter Zijlstra <peterz@infradead.org> Link: http://lkml.kernel.org/r/49b31321-0f70-392b-9a4f-649d3affe090@linux.intel.com Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
122 lines
3.3 KiB
C
122 lines
3.3 KiB
C
#ifndef __PERF_MMAP_H
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#define __PERF_MMAP_H 1
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#include <linux/compiler.h>
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#include <linux/refcount.h>
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#include <linux/types.h>
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#include <linux/ring_buffer.h>
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#include <stdbool.h>
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#ifdef HAVE_AIO_SUPPORT
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#include <aio.h>
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#endif
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#include "auxtrace.h"
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#include "event.h"
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struct aiocb;
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/**
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* struct perf_mmap - perf's ring buffer mmap details
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*
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* @refcnt - e.g. code using PERF_EVENT_IOC_SET_OUTPUT to share this
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*/
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struct perf_mmap {
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void *base;
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int mask;
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int fd;
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int cpu;
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refcount_t refcnt;
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u64 prev;
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u64 start;
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u64 end;
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bool overwrite;
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struct auxtrace_mmap auxtrace_mmap;
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char event_copy[PERF_SAMPLE_MAX_SIZE] __aligned(8);
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#ifdef HAVE_AIO_SUPPORT
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struct {
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void **data;
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struct aiocb *cblocks;
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struct aiocb **aiocb;
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int nr_cblocks;
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} aio;
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#endif
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cpu_set_t affinity_mask;
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u64 flush;
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void *data;
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int comp_level;
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};
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/*
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* State machine of bkw_mmap_state:
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*
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* .________________(forbid)_____________.
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* | V
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* NOTREADY --(0)--> RUNNING --(1)--> DATA_PENDING --(2)--> EMPTY
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* ^ ^ | ^ |
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* | |__(forbid)____/ |___(forbid)___/|
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* | |
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* \_________________(3)_______________/
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*
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* NOTREADY : Backward ring buffers are not ready
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* RUNNING : Backward ring buffers are recording
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* DATA_PENDING : We are required to collect data from backward ring buffers
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* EMPTY : We have collected data from backward ring buffers.
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*
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* (0): Setup backward ring buffer
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* (1): Pause ring buffers for reading
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* (2): Read from ring buffers
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* (3): Resume ring buffers for recording
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*/
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enum bkw_mmap_state {
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BKW_MMAP_NOTREADY,
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BKW_MMAP_RUNNING,
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BKW_MMAP_DATA_PENDING,
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BKW_MMAP_EMPTY,
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};
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struct mmap_params {
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int prot, mask, nr_cblocks, affinity, flush, comp_level;
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struct auxtrace_mmap_params auxtrace_mp;
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};
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int perf_mmap__mmap(struct perf_mmap *map, struct mmap_params *mp, int fd, int cpu);
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void perf_mmap__munmap(struct perf_mmap *map);
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void perf_mmap__get(struct perf_mmap *map);
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void perf_mmap__put(struct perf_mmap *map);
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void perf_mmap__consume(struct perf_mmap *map);
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static inline u64 perf_mmap__read_head(struct perf_mmap *mm)
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{
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return ring_buffer_read_head(mm->base);
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}
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static inline void perf_mmap__write_tail(struct perf_mmap *md, u64 tail)
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{
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ring_buffer_write_tail(md->base, tail);
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}
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union perf_event *perf_mmap__read_forward(struct perf_mmap *map);
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union perf_event *perf_mmap__read_event(struct perf_mmap *map);
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int perf_mmap__push(struct perf_mmap *md, void *to,
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int push(struct perf_mmap *map, void *to, void *buf, size_t size));
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#ifdef HAVE_AIO_SUPPORT
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int perf_mmap__aio_push(struct perf_mmap *md, void *to, int idx,
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int push(void *to, struct aiocb *cblock, void *buf, size_t size, off_t off),
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off_t *off);
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#else
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static inline int perf_mmap__aio_push(struct perf_mmap *md __maybe_unused, void *to __maybe_unused, int idx __maybe_unused,
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int push(void *to, struct aiocb *cblock, void *buf, size_t size, off_t off) __maybe_unused,
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off_t *off __maybe_unused)
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{
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return 0;
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}
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#endif
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size_t perf_mmap__mmap_len(struct perf_mmap *map);
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int perf_mmap__read_init(struct perf_mmap *md);
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void perf_mmap__read_done(struct perf_mmap *map);
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#endif /*__PERF_MMAP_H */
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