Hi Arnaldo, On Fri, Jun 07, 2019 at 03:23:25PM -0300, Arnaldo Carvalho de Melo wrote: > Em Fri, Jun 07, 2019 at 02:44:25PM +0800, Leo Yan escreveu: > > On Thu, Jun 06, 2019 at 05:10:56PM -0300, Arnaldo Carvalho de Melo wrote: > > > Em Wed, Jun 05, 2019 at 10:16:33AM -0600, Mathieu Poirier escreveu: > > > > This patch adds the necessay intelligence to properly compute the value > > > > of 'old' and 'head' when operating in snapshot mode. That way we can > > > > get > > > > the latest information in the AUX buffer and be compatible with the > > > > generic AUX ring buffer mechanic. > > > > > > Leo, have you had the chance to test/review this one? Suzuki? > > > > Sure. I applied this patch on the perf/core branch (with latest > > commit 3e4fbf36c1e3 'perf augmented_raw_syscalls: Move reading > > filename to the loop') and passed testing with below steps: > > > > # perf record -e cs_etm/@tmc_etr0/ -S -m,64 --per-thread ./sort & > > [1] 19097 > > Bubble sorting array of 30000 elements > > > > # kill -USR2 19097 > > # kill -USR2 19097 > > # kill -USR2 19097 > > [ perf record: Woken up 4 times to write data ] > > [ perf record: Captured and wrote 0.753 MB perf.data ] > > > > FWIW: > > > > Tested-by: Leo Yan <leo....@linaro.org> > > Thanks a lot, I've added your "Tester notes:" and also your Tested-by:. > > As I don't have hardware (yet) to test these patches, tests by people > who can test on real hardware is always super appreciated.
You are very welcome and it's my pleasure :) > Any suggestions for a SBC that I could buy to be able to do so? Below are several Arm development boards for referrence: - DB410c [1]: This board is the first choice for myself, since this board provides Debian (and Fedora :) support and it supports the mainline kernel pretty well; the CoreSight also is well supported. This board is about 80 USD so the cost is not expensive; on the other hand, please note one cons is the SDRAM is only 1GB, this will be impossible if you build some big projects (e.g. LLVM/Clang and BCC); but it's sufficient for perf related development and verification. - There have other several boards are in my mind: Raspberry Pi3 [2] and Hikey960 [3]. Raspberry Pi3 misses some features in the mainline kernel [4] and it has not enabled CoreSight hardware tracing feature; Hikey960 also have some patches are out of the mainline kenrel. Except you have special requirement (e.g. you want to use the board to build LLVM/Clang/BCC with big DDR size, etc), these two boards can be secondary choices. Please feel free let me know if you have questions for boards. Thanks, Leo Yan [1] https://www.96boards.org/product/dragonboard410c/ [2] https://www.raspberrypi.org/products/raspberry-pi-3-model-b-plus/ [3] https://www.96boards.org/product/hikey960/ [4] https://www.raspberrypi.org/forums/viewtopic.php?t=236568
