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perf auxtrace: Allow buffers to be mapped read / write

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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>
This commit is contained in:
Adrian Hunter 2021-04-30 10:03:03 +03:00 committed by Arnaldo Carvalho de Melo
parent 83d7f5f1ad
commit 6aa3afc9c8
2 changed files with 8 additions and 3 deletions
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5
tools/perf/util/auxtrace.c
View file

@ -1120,8 +1120,9 @@ int auxtrace_queue_data(struct perf_session *session, bool samples, bool events)
auxtrace_queue_data_cb, &qd);
}
void *auxtrace_buffer__get_data(struct auxtrace_buffer *buffer, int fd)
void *auxtrace_buffer__get_data_rw(struct auxtrace_buffer *buffer, int fd, bool rw)
{
int prot = rw ? PROT_READ | PROT_WRITE : PROT_READ;
size_t adj = buffer->data_offset & (page_size - 1);
size_t size = buffer->size + adj;
off_t file_offset = buffer->data_offset - adj;
@ -1130,7 +1131,7 @@ void *auxtrace_buffer__get_data(struct auxtrace_buffer *buffer, int fd)
if (buffer->data)
return buffer->data;
addr = mmap(NULL, size, PROT_READ, MAP_SHARED, fd, file_offset);
addr = mmap(NULL, size, prot, MAP_SHARED, fd, file_offset);
if (addr == MAP_FAILED)
return NULL;

6
tools/perf/util/auxtrace.h
View file

@ -533,7 +533,11 @@ int auxtrace_queue_data(struct perf_session *session, bool samples,
bool events);
struct auxtrace_buffer *auxtrace_buffer__next(struct auxtrace_queue *queue,
struct auxtrace_buffer *buffer);
void *auxtrace_buffer__get_data(struct auxtrace_buffer *buffer, int fd);
void *auxtrace_buffer__get_data_rw(struct auxtrace_buffer *buffer, int fd, bool rw);
static inline void *auxtrace_buffer__get_data(struct auxtrace_buffer *buffer, int fd)
{
return auxtrace_buffer__get_data_rw(buffer, fd, false);
}
void auxtrace_buffer__put_data(struct auxtrace_buffer *buffer);
void auxtrace_buffer__drop_data(struct auxtrace_buffer *buffer);
void auxtrace_buffer__free(struct auxtrace_buffer *buffer);