From: "Steven Rostedt (Google)" <rostedt@xxxxxxxxxxx> Now all the read APIs support memory mapped ring buffer. For those that use splice and pipe, if the tcpu is memory mapped, it will then fall back to copying directly from the memory map. Also added a tracfes_mapping_is_supported() API to test if the kernel and library support memory mapping. And updated the tests to use memory mapped ring buffers when possible. Steven Rostedt (Google) (7): libtracefs: Have mapping work with the other tracefs_cpu* functions libtracefs: Have tracefs_mmap_read() include subbuf meta data libtracefs: Have nonblock tracefs_cpu reads set errno EAGAIN libtracefs: Fix tracefs_mmap() kbuf usage libtracefs: Call mmap ioctl if a refresh happens libtracefs: Add tracefs_mapped_is_supported() API libtracefs utest: Add tests to use mapping if supported Documentation/libtracefs-cpu-map.txt | 38 ++++++++++++--- Documentation/libtracefs.txt | 1 + include/tracefs.h | 1 + src/tracefs-events.c | 8 +--- src/tracefs-mmap.c | 28 +++++++++-- src/tracefs-record.c | 72 +++++++++++++++++++++++++++- utest/tracefs-utest.c | 69 ++++++++++++++++++-------- 7 files changed, 176 insertions(+), 41 deletions(-) -- 2.43.0
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