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perf auxtrace: Allow buffers to be mapped read / write
To support in-place update, allow buffers to be mapped read / write. Signed-off-by: Adrian Hunter <adrian.hunter@intel.com> Reviewed-by: Andi Kleen <ak@linux.intel.com> Cc: Jiri Olsa <jolsa@redhat.com> Link: https://lore.kernel.org/r/20210430070309.17624-7-adrian.hunter@intel.com Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
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2 changed files with 8 additions and 3 deletions
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@ -1120,8 +1120,9 @@ int auxtrace_queue_data(struct perf_session *session, bool samples, bool events)
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auxtrace_queue_data_cb, &qd);
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}
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void *auxtrace_buffer__get_data(struct auxtrace_buffer *buffer, int fd)
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void *auxtrace_buffer__get_data_rw(struct auxtrace_buffer *buffer, int fd, bool rw)
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{
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int prot = rw ? PROT_READ | PROT_WRITE : PROT_READ;
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size_t adj = buffer->data_offset & (page_size - 1);
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size_t size = buffer->size + adj;
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off_t file_offset = buffer->data_offset - adj;
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@ -1130,7 +1131,7 @@ void *auxtrace_buffer__get_data(struct auxtrace_buffer *buffer, int fd)
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if (buffer->data)
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return buffer->data;
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addr = mmap(NULL, size, PROT_READ, MAP_SHARED, fd, file_offset);
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addr = mmap(NULL, size, prot, MAP_SHARED, fd, file_offset);
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if (addr == MAP_FAILED)
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return NULL;
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@ -533,7 +533,11 @@ int auxtrace_queue_data(struct perf_session *session, bool samples,
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bool events);
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struct auxtrace_buffer *auxtrace_buffer__next(struct auxtrace_queue *queue,
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struct auxtrace_buffer *buffer);
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void *auxtrace_buffer__get_data(struct auxtrace_buffer *buffer, int fd);
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void *auxtrace_buffer__get_data_rw(struct auxtrace_buffer *buffer, int fd, bool rw);
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static inline void *auxtrace_buffer__get_data(struct auxtrace_buffer *buffer, int fd)
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{
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return auxtrace_buffer__get_data_rw(buffer, fd, false);
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}
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void auxtrace_buffer__put_data(struct auxtrace_buffer *buffer);
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void auxtrace_buffer__drop_data(struct auxtrace_buffer *buffer);
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void auxtrace_buffer__free(struct auxtrace_buffer *buffer);
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