Good day, On Thu, 5 Dec 2019 at 06:36, zied guermazi <guermazi_z...@yahoo.com> wrote: > > hi, > I started implementing GDB process record and replay with ARM CoreSight as > described in the rfc published early this year. > Current implementation of coresight tracing in Perf is based on the sysfs > interface, by accessing /sys/bus/event_source/devices/cs_etm ... file. GDB > implementation of bts and ipt is based on the syscall "sys_perf_event_open". > it would be nice to use the similar mechanism for realizing similar > functionalities. therefore I would like to know if linux kernel (with > coresight deivers) is exposing coresight drivers through the syscall > sys_perf_event_open and if this is the case how shall I configure the > perf_event_attr to use it.
The coresight subsystem and drivers work the same way with regards to the sys_perf_event_open() system call. Implementation for both ARM and Intel follow the same perf/AUX buffer interface in order to provide a common front to users. In fact using coresight with perf works pretty much the same way as BTS or PT - documentation on that can be found in the kernel tree [1] and on github [2]. Thanks, Mathieu [1]. https://elixir.bootlin.com/linux/latest/source/Documentation/trace/coresight.rst [2]. https://github.com/Linaro/OpenCSD/blob/master/HOWTO.md > > thanks > Zied Guermazi > > > > _______________________________________________ linaro-toolchain mailing list linaro-toolchain@lists.linaro.org https://lists.linaro.org/mailman/listinfo/linaro-toolchain
