Changes in Build

fdf08e4b5a33e840b6c2a988cd4392b4443ca51b - perf unwind-libunwind: Make libunwind register reading cross platform

Thu, 14 May 2026 01:31:48 +0200

perf unwind-libunwind: Make libunwind register reading cross platformMove the libunwind register to perf register mapping functions inarch/../util/unwind-libunwind.c into a new libunwind-archdirectory. Rename the functions to__get_perf_regnum_for_unw_regnum_. Add untested ppc32 and s390functions. Add a get_perf_regnum_for_unw_regnum function that takes anELF machine as well as a register number and chooses the appropriatearchitecture implementation.Split the x86 and powerpc 32 and 64-bit implementations apart so thata single libunwind-.h header is included.Move the e_machine into the unwind_info struct to make it easier topass.Signed-off-by: Ian Rogers Cc: Adrian Hunter Cc: Albert Ou Cc: Alexander Shishkin Cc: Alexandre Ghiti Cc: Andrew Jones Cc: Athira Rajeev Cc: Dapeng Mi Cc: Dmitrii Dolgov <9erthalion6@gmail.com>Cc: Florian Fainelli Cc: Howard Chu Cc: Ingo Molnar Cc: James Clark Cc: Jiri Olsa Cc: John Garry Cc: Leo Yan Cc: Li Guan Cc: Namhyung Kim Cc: Palmer Dabbelt Cc: Paul Walmsley Cc: Peter Zijlstra Cc: Shimin Guo Cc: Thomas Richter Cc: Tomas Glozar Cc: Will Deacon [ Map UNW_PPC32_NIP to PERF_REG_POWERPC_NIP like done for 64-bit, pointed out by a local sashiko ]Signed-off-by: Arnaldo Carvalho de Melo List of files: /linux/tools/perf/arch/powerpc/util/Build

e5e66adfe45a6480d96b4e40edc05883915f44b2 - perf regs: Remove __weak attributive arch_sdt_arg_parse_op() function

Tue, 03 Feb 2026 03:43:56 +0100

perf regs: Remove __weak attributive arch_sdt_arg_parse_op() functionIn line with the previous patch, the __weak arch_sdt_arg_parse_op()function is removed.Architectural-specific implementations in the arch/ directory are nowconverted into sub-functions within the util/perf-regs-arch/ directory.The perf_sdt_arg_parse_op() function will call these sub-functions basedon the EM_HOST.This change enables cross-architecture calls to arch_sdt_arg_parse_op().No functional changes are intended.Suggested-by: Ian Rogers Reviewed-by: Ian Rogers Signed-off-by: Dapeng Mi Cc: Adrian Hunter Cc: Albert Ou Cc: Alexander Shishkin Cc: Alexandre Ghiti Cc: Guo Ren Cc: Ingo Molnar Cc: James Clark Cc: John Garry Cc: Mike Leach Cc: Namhyung Kim Cc: Palmer Dabbelt Cc: Paul Walmsley Cc: Peter Zijlstra Cc: Thomas Falcon Cc: Will Deacon Cc: Xudong Hao Cc: Zide Chen [ Fixed up somme fuzz with powerpc and x86 Build files wrt removing perf_regs.o ]Signed-off-by: Arnaldo Carvalho de Melo List of files: /linux/tools/perf/arch/powerpc/util/Build

ceea279f93760767c0e654341829334a1c881a08 - perf kvm stat: Remove use of the arch directory

Tue, 03 Feb 2026 19:26:36 +0100

perf kvm stat: Remove use of the arch directory`perf kvm stat` supports record and report options.By using the arch directory a report for a different machine type cannotbe supported.Move the kvm-stat code out of the arch directory and intoutil/kvm-stat-arch following the pattern of perf-regs and dwarf-regs.Avoid duplicate symbols by renaming functions to have the architecturename within them.For global variables, wrap them in an architecture specific function.Selecting the architecture to use with `perf kvm stat` is selected byEM_HOST, ie no different than before the change.Later the ELF machine can be determined from the session or a headerfeature (ie EM_HOST at the time of the record).The build and #define HAVE_KVM_STAT_SUPPORT is now redundant so removeacross Makefiles and in the build.Opportunistically constify architectural structs and arrays.Signed-off-by: Ian Rogers Cc: Aditya Bodkhe Cc: Adrian Hunter Cc: Albert Ou Cc: Alexander Shishkin Cc: Alexandre Ghiti Cc: Andi Kleen Cc: Andrew Jones Cc: Anubhav Shelat Cc: Anup Patel Cc: Athira Rajeev Cc: Blake Jones Cc: Chun-Tse Shao Cc: Dapeng Mi Cc: Dmitriy Vyukov Cc: Howard Chu Cc: Ingo Molnar Cc: James Clark Cc: Jiri Olsa Cc: John Garry Cc: Leo Yan Cc: Namhyung Kim Cc: Palmer Dabbelt Cc: Paul Walmsley Cc: Peter Zijlstra Cc: Quan Zhou Cc: Shimin Guo Cc: Swapnil Sapkal Cc: Thomas Falcon Cc: Will Deacon Cc: Yunseong Kim Signed-off-by: Arnaldo Carvalho de Melo List of files: /linux/tools/perf/arch/powerpc/util/Build

e62fae9d9e85d38cdda1ee08a424e1b5b8246620 - perf unwind-libdw: Fix a cross-arch unwinding bug

Sat, 17 Jan 2026 06:28:30 +0100

perf unwind-libdw: Fix a cross-arch unwinding bugThe set_initial_registers field of Dwfl_Thread_Callbacks needs to be setaccording to the arch of the stack samples being analyzed, not the archthat perf itself is built for.Currently perf fails to unwind stack samples collected from archsdifferent from that of the host perf is running on.This patch moves the arch-specific implementations of set_initial_registersfrom tools/perf/arch to tools/perf/utli/unwind-libdw-arch, similar to theway the perf-regs-arch folder contains arch-specific functions related toregisters, and chooses the implementation based on the arch of the databeing processed.Reviewed-by: Ian Rogers Signed-off-by: Shimin Guo Acked-by: Namhyung Kim Cc: Aditya Bodkhe Cc: Adrian Hunter Cc: Albert Ou Cc: Alexandre Ghiti Cc: Andi Kleen Cc: Athira Rajeev Cc: Chun-Tse Shao Cc: Dmitriy Vyukov Cc: Dr. David Alan Gilbert Cc: Guo Ren Cc: Haibo Xu Cc: Howard Chu Cc: Ingo Molnar Cc: James Clark Cc: Jiri Olsa Cc: John Garry Cc: Krzysztof Łopatowski Cc: Leo Yan Cc: Mark Wielaard Cc: Palmer Dabbelt Cc: Paul Walmsley Cc: Peter Zijlstra Cc: Sergei Trofimovich Cc: Stephen Brennan Cc: Thomas Falcon Cc: Will Deacon Signed-off-by: Ian Rogers Signed-off-by: Arnaldo Carvalho de Melo List of files: /linux/tools/perf/arch/powerpc/util/Build

754187ad73b73bcb44f106a8e5fc88789beff1bd - perf build: Remove NO_AUXTRACE build option

Mon, 10 Nov 2025 02:31:51 +0100

perf build: Remove NO_AUXTRACE build optionThe NO_AUXTRACE build option was used when the __get_cpuid featuretest failed or if it was provided on the command line. The option nolonger avoids a dependency on a library and so having the option isjust adding complexity to the code base. Remove the optionCONFIG_AUXTRACE from Build files and HAVE_AUXTRACE_SUPPORT by assumingit is always defined.Signed-off-by: Ian Rogers Reviewed-by: James Clark Signed-off-by: Namhyung Kim List of files: /linux/tools/perf/arch/powerpc/util/Build

1dbfaf94cf66ec4b19945aa4c76901e4af292a48 - perf powerpc: Add basic CONFIG_AUXTRACE support for VPA pmu on powerpc

Tue, 16 Sep 2025 07:25:31 +0200

perf powerpc: Add basic CONFIG_AUXTRACE support for VPA pmu on powerpcThe powerpc PMU collecting Dispatch Trace Log (DTL) entries makes use ofAUX support in perf infrastructure.The PMU driver has the functionality to collect trace entries in the auxbuffer.On the tools side, this data is made available as PERF_RECORD_AUXTRACErecords.This record is generated by "perf record" command.To enable the creation of PERF_RECORD_AUXTRACE, add functions toinitialize auxtrace records ie "auxtrace_record__init()".Fill in fields for other callbacks like info_priv_size, info_fill, free,recording options etc.Define auxtrace_type as PERF_AUXTRACE_VPA_DTL. Add header file todefine vpa dtl pmu specific details.Reviewed-by: Adrian Hunter Signed-off-by: Athira Rajeev Tested-by: Tejas Manhas Tested-by: Venkat Rao Bagalkote Cc: Aboorva Devarajan Cc: Aditya Bodkhe Cc: Hari Bathini Cc: Ian Rogers Cc: Jiri Olsa Cc: Madhavan Srinivasan Cc: Namhyung Kim Cc: Shrikanth Hegde Signed-off-by: Arnaldo Carvalho de Melo List of files: /linux/tools/perf/arch/powerpc/util/Build

6e19839a80b8713b836722ba9d99a3ab12cfb651 - perf sort: Use perf_env to set arch sort keys and header

Thu, 24 Jul 2025 18:33:02 +0200

perf sort: Use perf_env to set arch sort keys and headerPreviously arch_support_sort_key and arch_perf_header_entry used aweak symbol to compile as appropriate for x86 and powerpc. Alimitation to this is that the handling of a data file could vary incross-platform development. Change to using the perf_env of thecurrent session to determine the architecture kind and set the sortkey and header entries as appropriate.Signed-off-by: Ian Rogers Link: https://lore.kernel.org/r/20250724163302.596743-23-irogers@google.comSigned-off-by: Namhyung Kim List of files: /linux/tools/perf/arch/powerpc/util/Build

285b523c2da2e71f529e477a64b09f2e719f9d6f - perf dwarf-regs: Move powerpc dwarf-regs out of arch

Sat, 09 Nov 2024 00:45:58 +0100

perf dwarf-regs: Move powerpc dwarf-regs out of archMove arch/powerpc/util/dwarf-regs.c to util/dwarf-regs-powerpc.c andcompile in unconditionally. get_arch_regstr is redundant when EM_NONEis treated as EM_HOST so remove and update dwarf-regs.c conditions.Make get_powerpc_regs unconditionally available whwn libdw is.Reviewed-by: Masami Hiramatsu (Google) Signed-off-by: Ian Rogers Cc: Anup Patel Cc: Yang Jihong Cc: Palmer Dabbelt Cc: David S. Miller Cc: Albert Ou Cc: Shenlin Liang Cc: Nick Terrell Cc: Guilherme Amadio Cc: Steinar H. Gunderson Cc: Changbin Du Cc: Alexander Lobakin Cc: Przemek Kitszel Cc: Huacai Chen Cc: Guo Ren Cc: Masahiro Yamada Cc: Will Deacon Cc: James Clark Cc: Mike Leach Cc: Chen Pei Cc: Leo Yan Cc: Oliver Upton Cc: Aditya Gupta Cc: Kajol Jain Cc: Athira Rajeev Cc: linux-arm-kernel@lists.infradead.orgCc: linux-riscv@lists.infradead.orgCc: Bibo Mao Cc: John Garry Cc: Atish Patra Cc: Dima Kogan Cc: Paul Walmsley Cc: Dr. David Alan Gilbert Cc: linux-csky@vger.kernel.orgLink: https://lore.kernel.org/r/20241108234606.429459-14-irogers@google.comSigned-off-by: Namhyung Kim List of files: /linux/tools/perf/arch/powerpc/util/Build

5455d89bf3da85176606ff861f4178f6bea648ba - perf build: Rename CONFIG_DWARF to CONFIG_LIBDW

Thu, 17 Oct 2024 02:13:54 +0200

perf build: Rename CONFIG_DWARF to CONFIG_LIBDWIn Makefile.config for unwinding the name dwarf implies eitherlibunwind or libdw. Make it clearer that CONFIG_DWARF is really justdefined when libdw is present by renaming to CONFIG_LIBDW.Signed-off-by: Ian Rogers Acked-by: Namhyung Kim Tested-by: Leo Yan Cc: Anup Patel Cc: Yang Jihong Cc: Palmer Dabbelt Cc: David S. Miller Cc: Albert Ou Cc: Shenlin Liang Cc: Nick Terrell Cc: Guilherme Amadio Cc: Steinar H. Gunderson Cc: Changbin Du Cc: Alexander Lobakin Cc: Przemek Kitszel Cc: Huacai Chen Cc: Guo Ren Cc: Masahiro Yamada Cc: Masami Hiramatsu (Google) Cc: Will Deacon Cc: James Clark Cc: Mike Leach Cc: Chen Pei Cc: Leo Yan Cc: Oliver Upton Cc: Aditya Gupta Cc: Kajol Jain Cc: Athira Rajeev Cc: linux-arm-kernel@lists.infradead.orgCc: linux-riscv@lists.infradead.orgCc: Bibo Mao Cc: John Garry Cc: Atish Patra Cc: Dima Kogan Cc: Paul Walmsley Cc: Dr. David Alan Gilbert Cc: linux-csky@vger.kernel.orgLink: https://lore.kernel.org/r/20241017001354.56973-12-irogers@google.comSigned-off-by: Namhyung Kim List of files: /linux/tools/perf/arch/powerpc/util/Build

e467705a9fb37f51595aa6deaca085ccb4005454 - perf util: Make util its own library

Tue, 25 Jun 2024 23:41:15 +0200

perf util: Make util its own libraryMake the util directory into its own library. This is done to avoidcompiling code twice, once for the perf tool and once for the perfpython module. For convenience: arch/common.c scripts/perl/Perf-Trace-Util/Context.c scripts/python/Perf-Trace-Util/Context.care made part of this library.Signed-off-by: Ian Rogers Reviewed-by: James Clark Cc: Suzuki K Poulose Cc: Kees Cook Cc: Palmer Dabbelt Cc: Albert Ou Cc: Nick Terrell Cc: Gary Guo Cc: Alex Gaynor Cc: Boqun Feng Cc: Wedson Almeida Filho Cc: Ze Gao Cc: Alice Ryhl Cc: Andrei Vagin Cc: Yicong Yang Cc: Jonathan Cameron Cc: Guo Ren Cc: Miguel Ojeda Cc: Will Deacon Cc: Mike Leach Cc: Leo Yan Cc: Oliver Upton Cc: John Garry Cc: Benno Lossin Cc: Björn Roy Baron Cc: Andreas Hindborg Cc: Paul Walmsley Signed-off-by: Namhyung Kim Link: https://lore.kernel.org/r/20240625214117.953777-7-irogers@google.com List of files: /linux/tools/perf/arch/powerpc/util/Build

abbdd79b786e036e60f01b7907977943ebe7a74d - perf mem: Clean up perf_mem_events__name()

Tue, 23 Jan 2024 19:50:32 +0100

perf mem: Clean up perf_mem_events__name()Introduce a generic perf_mem_events__name(). Remove the ARCH-specificone.The mem_load events may have a different format. Add ldlat and aux_eventin the struct perf_mem_event to indicate the format and the extra auxevent.Add perf_mem_events_intel_aux[] to support the extra mem_load_aux event.Rename perf_mem_events__name to perf_pmu__mem_events_name.Reviewed-by: Ian Rogers Tested-by: Ravi Bangoria Tested-by: Leo Yan Signed-off-by: Kan Liang Cc: james.clark@arm.comCc: will@kernel.orgCc: mike.leach@linaro.orgCc: renyu.zj@linux.alibaba.comCc: yuhaixin.yhx@linux.alibaba.comCc: tmricht@linux.ibm.comCc: atrajeev@linux.vnet.ibm.comCc: linux-arm-kernel@lists.infradead.orgCc: john.g.garry@oracle.comLink: https://lore.kernel.org/r/20240123185036.3461837-4-kan.liang@linux.intel.comSigned-off-by: Namhyung Kim List of files: /linux/tools/perf/arch/powerpc/util/Build

378ef0f5d9d7f4652d7a40e0711e8b845ada1cbd - perf build: Use libtraceevent from the system

Mon, 05 Dec 2022 23:59:39 +0100

perf build: Use libtraceevent from the systemRemove the LIBTRACEEVENT_DYNAMIC and LIBTRACEFS_DYNAMIC make commandline variables.If libtraceevent isn't installed or NO_LIBTRACEEVENT=1 is passed to thebuild, don't compile in libtraceevent and libtracefs support.This also disables CONFIG_TRACE that controls "perf trace".CONFIG_LIBTRACEEVENT is used to control enablement in Build/Makefiles,HAVE_LIBTRACEEVENT is used in C code.Without HAVE_LIBTRACEEVENT tracepoints are disabled and as such thecommands kmem, kwork, lock, sched and timechart are removed. Themajority of commands continue to work including "perf test".Committer notes:Fixed up a tools/perf/util/Build reject and added: #include to tools/perf/util/scripting-engines/trace-event-perl.c.Committer testing: $ rpm -qi libtraceevent-devel Name : libtraceevent-devel Version : 1.5.3 Release : 2.fc36 Architecture: x86_64 Install Date: Mon 25 Jul 2022 03:20:19 PM -03 Group : Unspecified Size : 27728 License : LGPLv2+ and GPLv2+ Signature : RSA/SHA256, Fri 15 Apr 2022 02:11:58 PM -03, Key ID 999f7cbf38ab71f4 Source RPM : libtraceevent-1.5.3-2.fc36.src.rpm Build Date : Fri 15 Apr 2022 10:57:01 AM -03 Build Host : buildvm-x86-05.iad2.fedoraproject.org Packager : Fedora Project Vendor : Fedora Project URL : https://git.kernel.org/pub/scm/libs/libtrace/libtraceevent.git/ Bug URL : https://bugz.fedoraproject.org/libtraceevent Summary : Development headers of libtraceevent Description : Development headers of libtraceevent-libs $Default build: $ ldd ~/bin/perf | grep tracee libtraceevent.so.1 => /lib64/libtraceevent.so.1 (0x00007f1dcaf8f000) $ # perf trace -e sched:* --max-events 10 0.000 migration/0/17 sched:sched_migrate_task(comm: "", pid: 1603763 (perf), prio: 120, dest_cpu: 1) 0.005 migration/0/17 sched:sched_wake_idle_without_ipi(cpu: 1) 0.011 migration/0/17 sched:sched_switch(prev_comm: "", prev_pid: 17 (migration/0), prev_state: 1, next_comm: "", next_prio: 120) 1.173 :0/0 sched:sched_wakeup(comm: "", pid: 3138 (gnome-terminal-), prio: 120) 1.180 :0/0 sched:sched_switch(prev_comm: "", prev_prio: 120, next_comm: "", next_pid: 3138 (gnome-terminal-), next_prio: 120) 0.156 migration/1/21 sched:sched_migrate_task(comm: "", pid: 1603763 (perf), prio: 120, orig_cpu: 1, dest_cpu: 2) 0.160 migration/1/21 sched:sched_wake_idle_without_ipi(cpu: 2) 0.166 migration/1/21 sched:sched_switch(prev_comm: "", prev_pid: 21 (migration/1), prev_state: 1, next_comm: "", next_prio: 120) 1.183 :0/0 sched:sched_wakeup(comm: "", pid: 1602985 (kworker/u16:0-f), prio: 120, target_cpu: 1) 1.186 :0/0 sched:sched_switch(prev_comm: "", prev_prio: 120, next_comm: "", next_pid: 1602985 (kworker/u16:0-f), next_prio: 120) #Had to tweak tools/perf/util/setup.py to make sure the python bindingshared object links with libtraceevent if -DHAVE_LIBTRACEEVENT ispresent in CFLAGS.Building with NO_LIBTRACEEVENT=1 uncovered some more build failures:- Make building of data-convert-bt.c to CONFIG_LIBTRACEEVENT=y- perf-$(CONFIG_LIBTRACEEVENT) += scripts/- bpf_kwork.o needs also to be dependent on CONFIG_LIBTRACEEVENT=y- The python binding needed some fixups and util/trace-event.c can't be built and linked with the python binding shared object, so remove it in tools/perf/util/setup.py and exclude it from the list of dependencies in the python/perf.so Makefile.perf target.Building without libtraceevent-devel installed uncovered more buildfailures:- The python binding tools/perf/util/python.c was assuming that traceevent/parse-events.h was always available, which was the case when we defaulted to using the in-kernel tools/lib/traceevent/ files, now we need to enclose it under ifdef HAVE_LIBTRACEEVENT, just like the other parts of it that deal with tracepoints.- We have to ifdef the rules in the Build files with CONFIG_LIBTRACEEVENT=y to build builtin-trace.c and tools/perf/trace/beauty/ as we only ifdef setting CONFIG_TRACE=y when setting NO_LIBTRACEEVENT=1 in the make command line, not when we don't detect libtraceevent-devel installed in the system. Simplification here to avoid these two ways of disabling builtin-trace.c and not having CONFIG_TRACE=y when libtraceevent-devel isn't installed is the clean way.From Athira:tools/perf/arch/powerpc/util/Build-perf-y += kvm-stat.o+perf-$(CONFIG_LIBTRACEEVENT) += kvm-stat.oThen, ditto for arm64 and s390, detected by container cross build tests.- s/390 uses test__checkevent_tracepoint() that is now only available if HAVE_LIBTRACEEVENT is defined, enclose the callsite with ifder HAVE_LIBTRACEEVENT.Also from Athira:With this change, I could successfully compile in these environment:- Without libtraceevent-devel installed- With libtraceevent-devel installed- With “make NO_LIBTRACEEVENT=1”Then, finally rename CONFIG_TRACEEVENT to CONFIG_LIBTRACEEVENT forconsistency with other libraries detected in tools/perf/.Signed-off-by: Ian Rogers Tested-by: Arnaldo Carvalho de Melo Tested-by: Athira Rajeev Cc: Alexander Shishkin Cc: Jiri Olsa Cc: Mark Rutland Cc: Namhyung Kim Cc: Nick Desaulniers Cc: Peter Zijlstra Cc: Stephane Eranian Cc: bpf@vger.kernel.orgLink: http://lore.kernel.org/lkml/20221205225940.3079667-3-irogers@google.comSigned-off-by: Arnaldo Carvalho de Melo List of files: /linux/tools/perf/arch/powerpc/util/Build

a5d20d42a2f2dc2b2f9e9361912062732414090d - perf symbol: Remove archsymbolsfixup_end()

Sat, 16 Apr 2022 02:40:48 +0200

perf symbol: Remove arch__symbols__fixup_end()Now the generic code can handle kallsyms fixup properly so no need tokeep the arch-functions anymore.Fixes: 3cf6a32f3f2a4594 ("perf symbols: Fix symbol size calculation condition")Signed-off-by: Namhyung Kim Acked-by: Ian Rogers Cc: Heiko Carstens Cc: Ingo Molnar Cc: Jiri Olsa Cc: John Garry Cc: Leo Yan Cc: Mark Rutland Cc: Masami Hiramatsu Cc: Mathieu Poirier Cc: Michael Ellerman Cc: Michael Petlan Cc: Peter Zijlstra Cc: Song Liu Cc: Will Deacon Cc: linux-s390@vger.kernel.orgCc: linuxppc-dev@lists.ozlabs.orgLink: https://lore.kernel.org/r/20220416004048.1514900-4-namhyung@kernel.orgSigned-off-by: Arnaldo Carvalho de Melo List of files: /linux/tools/perf/arch/powerpc/util/Build

ff0bd0a33f257cc01c0b777c1423205e49049777 - perf powerpc: Add support for PERF_SAMPLE_WEIGHT_STRUCT

Mon, 22 Mar 2021 15:57:25 +0100

perf powerpc: Add support for PERF_SAMPLE_WEIGHT_STRUCTAdd arch specific arch_evsel__set_sample_weight() to set the newsample type for powerpc.Add arch specific arch_perf_parse_sample_weight() to store thesample->weight values depending on the sample type applied.if the new sample type (PERF_SAMPLE_WEIGHT_STRUCT) is applied,store only the lower 32 bits to sample->weight. If sample typeis 'PERF_SAMPLE_WEIGHT', store the full 64-bit to sample->weight.Signed-off-by: Athira Rajeev Reviewed-by: Madhavan Srinivasan Acked-by: Jiri Olsa Cc: Kajol Jain Cc: Kan Liang Cc: Michael Ellerman Cc: Peter Zijlstra Cc: Ravi Bangoria Link: https://lore.kernel.org/r/1616425047-1666-4-git-send-email-atrajeev@linux.vnet.ibm.comSigned-off-by: Arnaldo Carvalho de Melo List of files: /linux/tools/perf/arch/powerpc/util/Build

557c3eadb7712741ec2d8c6a274dc8ec2edf4026 - perf powerpc: Fix gap between kernel end and module start

Tue, 29 Dec 2020 03:14:14 +0100

perf powerpc: Fix gap between kernel end and module startRunning "perf mem report" in TUI mode fails with ENOMEM message inpowerpc: failed to process sampleRunning with debug and verbose options points that issue is whileallocating memory for sample histograms.The error path is: symbol__inc_addr_samples() -> __symbol__inc_addr_samples() -> annotated_source__histogram()symbol__inc_addr_samples() calls annotated_source__alloc_histograms ()to allocate memory for sample histograms using calloc(). Here calloc()fails since the size of symbol is huge. The size of a symbol iscalculated as difference between its start and end address.Example histogram allocation that fails is: sym->name is _end sym->start is 0xc0000000027a0000 sym->end is 0xc008000003890000 symbol__size(sym) is 0x80000010f0000In the above case, the difference between sym->start(0xc0000000027a0000) and sym->end (0xc008000003890000) is huge.This is same problem as in s390 and arm64 which are fixed in commits: b9c0a64901d5 ("perf annotate: Fix s390 gap between kernel end and module start") 78886f3ed37e ("perf symbols: Fix arm64 gap between kernel start and module end")When this symbol was read first, its start and end address was set toaddress which matches with data from /proc/kallsyms.After symbol__new(): symbol__new: _end 0xc0000000027a0000-0xc0000000027a0000 From /proc/kallsyms: ... c000000002799370 b backtrace_flag c000000002799378 B radix_tree_node_cachep c000000002799380 B __bss_stop c0000000027a0000 B _end c008000003890000 t icmp_checkentry [ip_tables] c008000003890038 t ipt_alloc_initial_table [ip_tables] c008000003890468 T ipt_do_table [ip_tables] c008000003890de8 T ipt_unregister_table_pre_exit [ip_tables] ...Perf calls function symbols__fixup_end() which sets the end of symbol to0xc008000003890000, which is the next address and this is the startaddress of first module (icmp_checkentry in above) which will make thehuge symbol size of 0x80000010f0000.After symbols__fixup_end: symbols__fixup_end: sym->name: _end sym->start: 0xc0000000027a0000 sym->end: 0xc008000003890000On powerpc, kernel text segment is located at 0xc000000000000000 whereasthe modules are located at very high memory addresses,0xc00800000xxxxxxx. Since the gap between end of kernel text segment andbeginning of first module's address is high, histogram allocation usingcalloc fails.Fix this by detecting the kernel's last symbol and limiting the range oflast kernel symbol to pagesize.Signed-off-by: Athira RajeevAcked-by: Jiri Olsa Tested-By: Kajol Jain Cc: Madhavan Srinivasan Cc: Michael Ellerman Link: https://lore.kernel.org/r/1609208054-1566-1-git-send-email-atrajeev@linux.vnet.ibm.comSigned-off-by: Arnaldo Carvalho de Melo List of files: /linux/tools/perf/arch/powerpc/util/Build

39548e50e689edb76761a89e25ced7854795133d - perf powerpc: Don't ignore sym-handling.c file

Sat, 09 May 2020 13:21:13 +0200

perf powerpc: Don't ignore sym-handling.c fileCommit 7eec00a74720 ("perf symbols: Consolidate symbol fixup issue")removed powerpc specific sym-handling.c file from Build. This wasn'tcaught by build CI because all functions in this file are declaredas __weak in common code. Fix it.Fixes: 7eec00a74720 ("perf symbols: Consolidate symbol fixup issue")Reported-by: Sandipan Das Signed-off-by: Ravi Bangoria Reviewed-by: Leo Yan Reviewed-by: Naveen N. Rao Acked-by: Sandipan Das Cc: Jiri Olsa Link: http://lore.kernel.org/lkml/20200509112113.174745-1-ravi.bangoria@linux.ibm.comSigned-off-by: Arnaldo Carvalho de Melo List of files: /linux/tools/perf/arch/powerpc/util/Build

7eec00a74720d35b6d89505350e5b08ecef376c0 - perf symbols: Consolidate symbol fixup issue

Fri, 06 Mar 2020 02:57:58 +0100

perf symbols: Consolidate symbol fixup issueAfter copying Arm64's perf archive with object files and perf.data fileto x86 laptop, the x86's perf kernel symbol resolution fails. Itoutputs 'unknown' for all symbols parsing.This issue is root caused by the function elf__needs_adjust_symbols(),x86 perf tool uses one weak version, Arm64 (and powerpc) has rewrittentheir own version. elf__needs_adjust_symbols() decides if need to parsesymbols with the relative offset address; but x86 building uses the weakfunction which misses to check for the elf type 'ET_DYN', so that itcannot parse symbols in Arm DSOs due to the wrong result fromelf__needs_adjust_symbols().The DSO parsing should not depend on any specific architecture perfbuilding; e.g. x86 perf tool can parse Arm and Arm64 DSOs, vice versa.And confirmed by Naveen N. Rao that powerpc64 kernels are not beingbuilt as ET_DYN anymore and change to ET_EXEC.This patch removes the arch specific functions for Arm64 and powerpc andchanges elf__needs_adjust_symbols() as a common function.In the common elf__needs_adjust_symbols(), it checks an extra condition'ET_DYN' for elf header type. With this fixing, the Arm64 DSO can beparsed properly with x86's perf tool.Before: # perf script main 3258 1 branches: 0 [unknown] ([unknown]) => ffff800010c4665c [unknown] ([kernel.kallsyms]) main 3258 1 branches: ffff800010c46670 [unknown] ([kernel.kallsyms]) => ffff800010c4eaec [unknown] ([kernel.kallsyms]) main 3258 1 branches: ffff800010c4eaec [unknown] ([kernel.kallsyms]) => ffff800010c4eb00 [unknown] ([kernel.kallsyms]) main 3258 1 branches: ffff800010c4eb08 [unknown] ([kernel.kallsyms]) => ffff800010c4e780 [unknown] ([kernel.kallsyms]) main 3258 1 branches: ffff800010c4e7a0 [unknown] ([kernel.kallsyms]) => ffff800010c4eeac [unknown] ([kernel.kallsyms]) main 3258 1 branches: ffff800010c4eebc [unknown] ([kernel.kallsyms]) => ffff800010c4ed80 [unknown] ([kernel.kallsyms])After: # perf script main 3258 1 branches: 0 [unknown] ([unknown]) => ffff800010c4665c coresight_timeout+0x54 ([kernel.kallsyms]) main 3258 1 branches: ffff800010c46670 coresight_timeout+0x68 ([kernel.kallsyms]) => ffff800010c4eaec etm4_enable_hw+0x3cc ([kernel.kallsyms]) main 3258 1 branches: ffff800010c4eaec etm4_enable_hw+0x3cc ([kernel.kallsyms]) => ffff800010c4eb00 etm4_enable_hw+0x3e0 ([kernel.kallsyms]) main 3258 1 branches: ffff800010c4eb08 etm4_enable_hw+0x3e8 ([kernel.kallsyms]) => ffff800010c4e780 etm4_enable_hw+0x60 ([kernel.kallsyms]) main 3258 1 branches: ffff800010c4e7a0 etm4_enable_hw+0x80 ([kernel.kallsyms]) => ffff800010c4eeac etm4_enable+0x2d4 ([kernel.kallsyms]) main 3258 1 branches: ffff800010c4eebc etm4_enable+0x2e4 ([kernel.kallsyms]) => ffff800010c4ed80 etm4_enable+0x1a8 ([kernel.kallsyms])v3: Changed to check for ET_DYN across all architectures.v2: Fixed Arm64 and powerpc native building.Reported-by: Mike Leach Signed-off-by: Leo Yan Reviewed-by: Naveen N. Rao Acked-by: Jiri Olsa Cc: Alexander Shishkin Cc: Allison Randal Cc: Enrico Weigelt Cc: Greg Kroah-Hartman Cc: Hendrik Brueckner Cc: John Garry Cc: Kate Stewart Cc: Mark Rutland Cc: Mathieu Poirier Cc: Namhyung Kim Cc: Peter Zijlstra Cc: Thomas Gleixner Cc: Thomas Richter Link: http://lore.kernel.org/lkml/20200306015759.10084-1-leo.yan@linaro.orgSigned-off-by: Arnaldo Carvalho de Melo List of files: /linux/tools/perf/arch/powerpc/util/Build

5ff328836dfde0cef9f28c8b8791a90a36d7a183 - perf tools: Rename build libperf to perf

Wed, 13 Feb 2019 13:32:39 +0100

perf tools: Rename build libperf to perfRename build libperf to perf, because it's used to build perf.The libperf build object name will be used for libperf library.Signed-off-by: Jiri Olsa Cc: Alexander Shishkin Cc: Namhyung Kim Cc: Peter Zijlstra Link: http://lkml.kernel.org/r/20190213123246.4015-4-jolsa@kernel.orgSigned-off-by: Arnaldo Carvalho de Melo List of files: /linux/tools/perf/arch/powerpc/util/Build

f0fabf9c897327abd39018aefb5029aff8c7e133 - perf mem/c2c: Fix perf_mem_events to support powerpc

Tue, 29 Jan 2019 14:24:12 +0100

perf mem/c2c: Fix perf_mem_events to support powerpcPowerPC hardware does not have a builtin latency filter (--ldlat) forthe "mem-load" event and perf_mem_events by default includes"/ldlat=30/" which is causing a failure on PowerPC. Refactor the code tosupport "perf mem/c2c" on PowerPC.This patch depends on kernel side changes done my Madhavan:https://lists.ozlabs.org/pipermail/linuxppc-dev/2018-December/182596.htmlSigned-off-by: Ravi Bangoria Acked-by: Jiri Olsa Cc: Dick Fowles Cc: Don Zickus Cc: Joe Mario Cc: Madhavan Srinivasan Cc: Michael Ellerman Cc: Namhyung Kim Cc: linuxppc-dev@lists.ozlabs.orgLink: http://lkml.kernel.org/r/20190129132412.771-1-ravi.bangoria@linux.ibm.comSigned-off-by: Arnaldo Carvalho de Melo List of files: /linux/tools/perf/arch/powerpc/util/Build

a7f0fda085870312ab694b19a1304ece161a1217 - perf unwind: Support for powerpc

Thu, 01 Jun 2017 12:24:41 +0200

perf unwind: Support for powerpcPorting PPC to libdw only needs an architecture-specific hook to movethe register state from perf to libdw.The ARM and x86 architectures already use libdw, and it is useful tohave as much common code for the unwinder as possible. Mark Wielaardhas contributed a frame-based unwinder to libdw, so that unwinding workseven for binaries that do not have CFI information. In addition,libunwind is always preferred to libdw by the build machinery so thiscannot introduce regressions on machines that have both libunwind andlibdw installed.Signed-off-by: Paolo Bonzini Acked-by: Jiri Olsa Acked-by: Milian Wolff Acked-by: Ravi Bangoria Cc: Naveen N. Rao Cc: linuxppc-dev@lists.ozlabs.orgLink: http://lkml.kernel.org/r/1496312681-20133-1-git-send-email-pbonzini@redhat.comSigned-off-by: Arnaldo Carvalho de Melo List of files: /linux/tools/perf/arch/powerpc/util/Build