On 02/13/18 04:15 AM, yangyongyong wrote: > Hi all, > Recently I upgrade libunwind from 1.2 to 1.3 (until commit > 26718da1713a5698070e702e68db1f995baeae07) mostly because commit > 5a491cb2d889f03952182d611d2ac6e15c3c5845: > "arm64: Support for restore of ARM64 Neon callee-saved registers during > unwind" > > v1.3 works well except the performance regression of unw_get_proc_info. > I sampled the time consumed by unw_get_proc_info with > clock_gettime(CLOCK_MONOTONIC, ...) > Here is the results (Tests are performed on aarch64/linux with gcc 5.4, us > means microsecond): > v1.3: > > It seems v1.3 costs 10 times more. And things are getting even worse on qemu. > I do not have any clue for this problem, please some one enlights me.
This was just discussed on the list, maybe the same issue: http://lists.nongnu.org/archive/html/libunwind-devel/2018-01/msg00001.html Wasn't fully resolved though, there is still an open task https://github.com/libunwind/libunwind/issues/63 > > By the way, v1.3 can not be built on Android NDK r16b > (https://urldefense.proofpoint.com/v2/url?u=https-3A__dl.google.com_android_repository_android-2Dndk-2Dr16b-2Dlinux-2Dx86-5F64.zip&d=DwIFAg&c=5VD0RTtNlTh3ycd41b3MUw&r=vou6lT5jmE_fWQWZZgNrsMWu4RT87QAB9V07tPHlP5U&m=0XbMT1rFlolANBmO2Mtg-ayptQyu48agi9TKFupfZlg&s=f84LSoJQf3Q12nfD5H-8M2WWFiFRAuBh-26JrLEHFwM&e= > ) with configure : "configure --host=aarch64-linux-android > --prefix=xxx_install_yyy --enable-debug". Following are some potential > problems: > > 1. test-coredump-unwind includes execinfo.h which does not exist on > android. > > 2. HAVE_STRUCT_ELF_PRSTATUS is not defined during configuration. > > 3. struct elf_prstatus is defined in linux/elfcore.h which is not > included. I would love to merge a patch if you have one to fix these issues. I do not have an android setup. _______________________________________________ Libunwind-devel mailing list Libunwindfirstname.lastname@example.org https://lists.nongnu.org/mailman/listinfo/libunwind-devel