- 21 Jul, 2022 2 commits
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Namhyung Kim authored
It should be lock_text_end instead of _start. Fixes: 0d2997f7 ("perf lock: Look up callchain for the contended locks") Signed-off-by:
Namhyung Kim <namhyung@kernel.org> Cc: Boqun Feng <boqun.feng@gmail.com> Cc: Davidlohr Bueso <dave@stgolabs.net> Cc: Ian Rogers <irogers@google.com> Cc: Ingo Molnar <mingo@kernel.org> Cc: Jiri Olsa <jolsa@kernel.org> Cc: Namhyung Kim <namhyung@kernel.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Waiman Long <longman@redhat.com> Cc: Will Deacon <will@kernel.org> Link: https://lore.kernel.org/r/20220721043644.153718-2-namhyung@kernel.orgSigned-off-by:
Arnaldo Carvalho de Melo <acme@redhat.com>
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Arnaldo Carvalho de Melo authored
Synch with upstream, to pick up recent developments. Signed-off-by:
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- 20 Jul, 2022 38 commits
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Arnaldo Carvalho de Melo authored
Noticed after switching to python3 by default on some older fedora releases: 35 38.20 fedora:27 : FAIL clang version 5.0.2 (tags/RELEASE_502/final) clang-5.0: error: argument unused during compilation: '-specs=/usr/lib/rpm/redhat/redhat-hardened-cc1' [-Werror,-Wunused-command-line-argument] clang-5.0: error: argument unused during compilation: '-specs=/usr/lib/rpm/redhat/redhat-hardened-cc1' [-Werror,-Wunused-command-line-argument] error: command 'clang' failed with exit status 1 Signed-off-by: -
Linus Torvalds authored
When the pipe is closed, we mark the associated watchqueue defunct by calling watch_queue_clear(). However, while that is protected by the watchqueue lock, new watchqueue entries aren't actually added under that lock at all: they use the pipe->rd_wait.lock instead, and looking up that pipe happens without any locking. The watchqueue code uses the RCU read-side section to make sure that the wqueue entry itself hasn't disappeared, but that does not protect the pipe_info in any way. So make sure to actually hold the wqueue lock when posting watch events, properly serializing against the pipe being torn down. Reported-by:
Noam Rathaus <noamr@ssd-disclosure.com> Cc: Greg KH <gregkh@linuxfoundation.org> Cc: David Howells <dhowells@redhat.com> Signed-off-by:
Linus Torvalds <torvalds@linux-foundation.org>
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Eric Snowberg authored
The lockdown LSM is primarily used in conjunction with UEFI Secure Boot. This LSM may also be used on machines without UEFI. It can also be enabled when UEFI Secure Boot is disabled. One of lockdown's features is to prevent kexec from loading untrusted kernels. Lockdown can be enabled through a bootparam or after the kernel has booted through securityfs. If IMA appraisal is used with the "ima_appraise=log" boot param, lockdown can be defeated with kexec on any machine when Secure Boot is disabled or unavailable. IMA prevents setting "ima_appraise=log" from the boot param when Secure Boot is enabled, but this does not cover cases where lockdown is used without Secure Boot. To defeat lockdown, boot without Secure Boot and add ima_appraise=log to the kernel command line; then: $ echo "integrity" > /sys/kernel/security/lockdown $ echo "appraise func=KEXEC_KERNEL_CHECK appraise_type=imasig" > \ /sys/kernel/security/ima/policy $ kexec -ls unsigned-kernel Add a call to verify ima appraisal is set to "enforce" whenever lockdown is enabled. This fixes CVE-2022-21505. Cc: stable@vger.kernel.org Fixes: 29d3c1c8 ("kexec: Allow kexec_file() with appropriate IMA policy when locked down") Signed-off-by:Eric Snowberg <eric.snowberg@oracle.com> Acked-by:
Mimi Zohar <zohar@linux.ibm.com> Reviewed-by:
John Haxby <john.haxby@oracle.com> Signed-off-by:
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Arnaldo Carvalho de Melo authored
One in perf's CFLAGS and the other in the distro python binding scripts. So if use the usual technique of first -D_FORTIFY_SOURCE then -D it. Noticed with: opensuse tumbleweed: gcc version 12.1.1 20220629 [revision 7811663964aa7e31c3939b859bbfa2e16919639f] (SUSE Linux) Signed-off-by: -
Thomas Richter authored
Perf test case 83: perf stat CSV output linter might fail on s390. The reason for this is the output of the command ./perf stat -x, -A -a --no-merge true which depends on a .config file setting. When CONFIG_SCHED_TOPOLOGY is set, the output of above perf command is CPU0,1.50,msec,cpu-clock,1502781,100.00,1.052,CPUs utilized When CONFIG_SCHED_TOPOLOGY is *NOT* set the output of above perf command is 0.95,msec,cpu-clock,949800,100.00,1.060,CPUs utilized Fix the test case to accept both output formats. Output before: # perf test 83 83: perf stat CSV output linter : FAILED! # Output after: # ./perf test 83 83: perf stat CSV output linter : Ok # Fixes: ec906102 ("perf test: Fix "perf stat CSV output linter" test on s390") Signed-off-by:
Thomas Richter <tmricht@linux.ibm.com> Acked-by:
Ian Rogers <irogers@google.com> Acked-by:
Sumanth Korikkar <sumanthk@linux.ibm.com> Cc: Heiko Carstens <hca@linux.ibm.com> Cc: Sven Schnelle <svens@linux.ibm.com> Cc: Vasily Gorbik <gor@linux.ibm.com> Link: https://lore.kernel.org/r/20220720123419.220953-1-tmricht@linux.ibm.comSigned-off-by:
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Jason Wang authored
The double `the' is duplicated in the comment, remove one. Signed-off-by:
Jason Wang <wangborong@cdjrlc.com> Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com> Cc: James Clark <james.clark@arm.com> Cc: Jiri Olsa <jolsa@kernel.org> Cc: John Garry <john.garry@huawei.com> Cc: Leo Yan <leo.yan@linaro.org> Cc: Mark Rutland <mark.rutland@arm.com> Cc: Mathieu Poirier <mathieu.poirier@linaro.org> Cc: Mike Leach <mike.leach@linaro.org> Cc: Namhyung Kim <namhyung@kernel.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Suzuki Poulouse <suzuki.poulose@arm.com> Cc: Will Deacon <will@kernel.org> Cc: coresight@lists.linaro.org Cc: linux-arm-kernel@lists.infradead.org Link: http://lore.kernel.org/lkml/20220716044040.43123-1-wangborong@cdjrlc.comSigned-off-by:
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Jason Wang authored
The double `the' is duplicated in the comment, remove one. Signed-off-by:
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Arnaldo Carvalho de Melo authored
On gcc 12 we started seeing this: In file included from /usr/lib/perl5/5.36.0/x86_64-linux-thread-multi/CORE/perl.h:2999, from util/scripting-engines/trace-event-perl.c:35: /usr/lib/perl5/5.36.0/x86_64-linux-thread-multi/CORE/inline.h: In function 'Perl_is_utf8_valid_partial_char_flags': /usr/lib/perl5/5.36.0/x86_64-linux-thread-multi/CORE/handy.h:125:23: error: cast from function call of type 'STRLEN' {aka 'long unsigned int'} to non-matching type '_Bool' [-Werror=bad-function-cast] 125 | #define cBOOL(cbool) ((bool) (cbool)) | ^ /usr/lib/perl5/5.36.0/x86_64-linux-thread-multi/CORE/inline.h:2363:12: note: in expansion of macro 'cBOOL' 2363 | return cBOOL(is_utf8_char_helper_(s0, e, flags)); | ^~~~~ In file included from /usr/lib/perl5/5.36.0/x86_64-linux-thread-multi/CORE/perl.h:7242: /usr/lib/perl5/5.36.0/x86_64-linux-thread-multi/CORE/inline.h: In function 'Perl_cop_file_avn': /usr/lib/perl5/5.36.0/x86_64-linux-thread-multi/CORE/inline.h:3489:5: error: ISO C90 forbids mixed declarations and code [-Werror=declaration-after-statement] 3489 | const char *file = CopFILE(cop); | ^~~~~ In file included from /usr/lib/perl5/5.36.0/x86_64-linux-thread-multi/CORE/perl.h:7243: /usr/lib/perl5/5.36.0/x86_64-linux-thread-multi/CORE/sv_inline.h: In function 'Perl_newSV_type': /usr/lib/perl5/5.36.0/x86_64-linux-thread-multi/CORE/sv_inline.h:376:5: error: enumeration value 'SVt_LAST' not handled in switch [-Werror=switch-enum] 376 | switch (type) { | ^~~~~~ So disable those warnings to keep building with perl devel headers. Noticed, among other distros, on opensuse tumbleweed: gcc version 12.1.1 20220629 [revision 7811663964aa7e31c3939b859bbfa2e16919639f] (SUSE Linux) Signed-off-by: -
Ian Rogers authored
Fix the following DeprecationWarning: tools/perf/util/setup.py:31: DeprecationWarning: The distutils package is deprecated and slated for removal in Python 3.12. Use setuptools or check PEP 632 for potential alternatives Note: the setuptools module may need installing, for example: $ sudo apt install python-setuptools Reviewer comments: James said: Tested it with python 2.7 and 3.8 by running "make install-python_ext PYTHON=..." Committer notes: Tested with: $ make -k BUILD_BPF_SKEL=1 PYTHON=python3 O=/tmp/build/perf -C tools/perf install-bin ; perf test python $ make -k BUILD_BPF_SKEL=1 O=/tmp/build/perf -C tools/perf install-bin ; perf test python Reviewed-by:
James Clark <james.clark@arm.com> Signed-off-by:
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Ian Rogers authored
If HAVE_GTK2_SUPPORT isn't defined then --gtk can't succeed, don't support it as a command line option in this case. v2. Is a rebase. Patch appears to have been missed in: https://lore.kernel.org/lkml/Ygu40djM1MqAfkcF@kernel.org/Signed-off-by:
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Adrian Hunter authored
Now it is possible to decode a host Intel PT trace including guest machine user space, add documentation for the steps needed to do it. Signed-off-by:
Adrian Hunter <adrian.hunter@intel.com> Acked-by:
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Adrian Hunter authored
When decoding with guest sideband information, for VMX non-root (NR) i.e. guest events, replace the host (hypervisor) pid/tid with guest values, and provide also the new machine_pid and vcpu values. Signed-off-by:
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Adrian Hunter authored
When decoding with guest sideband information, for VMX non-root (NR) i.e. guest errors, replace the host (hypervisor) pid/tid with guest values, and provide also the new machine_pid and vcpu values. Signed-off-by:
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Adrian Hunter authored
Prior to decoding, determine what guest thread, if any, is running. Signed-off-by:
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Adrian Hunter authored
The sync_switch facility attempts to better synchronize context switches with the Intel PT trace, however it is not designed for guest machine context switches, so disable it when guest sideband is detected. Signed-off-by:
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Adrian Hunter authored
Use guest context switch events to keep track of which guest thread is running on a particular guest machine and VCPU. Signed-off-by:
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Adrian Hunter authored
To aid debugging, add some more logging to intel_pt_walk_next_insn(). Signed-off-by:
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Adrian Hunter authored
Remove guest_machine_pid because it is not needed. Signed-off-by:
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Adrian Hunter authored
Add a helper function to determine if an event is a guest event. Signed-off-by:
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Adrian Hunter authored
If a kernel mmap event was recorded inside a guest and injected into a host perf.data file, then it will match a host mmap_name not a guest mmap_name, see machine__set_mmap_name(). So try matching a host mmap_name in that case. Signed-off-by:
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Adrian Hunter authored
Prepare machine__set_current_tid() for use with guest machines that do not currently have a machine->env->nr_cpus_avail value by making use of realloc_array_as_needed(). Signed-off-by:
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Adrian Hunter authored
Inject events from a perf.data file recorded in a virtual machine into a perf.data file recorded on the host at the same time. Only side band events (e.g. mmap, comm, fork, exit etc) and build IDs are injected. Additionally, the guest kcore_dir is copied as kcore_dir__ appended to the machine PID. This is non-trivial because: o It is not possible to process 2 sessions simultaneously so instead events are first written to a temporary file. o To avoid conflict, guest sample IDs are replaced with new unused sample IDs. o Guest event's CPU is changed to be the host CPU because it is more useful for reporting and analysis. o Sample ID is mapped to machine PID which is recorded with VCPU in the id index. This is important to allow guest events to be related to the guest machine and VCPU. o Timestamps must be converted. o Events are inserted to obey finished-round ordering. The anticipated use-case is: - start recording sideband events in a guest machine - start recording an AUX area trace on the host which can trace also the guest (e.g. Intel PT) - run test case on the guest - stop recording on the host - stop recording on the guest - copy the guest perf.data file to the host - inject the guest perf.data file sideband events into the host perf.data file using perf inject - the resulting perf.data file can now be used Subsequent patches provide Intel PT support for this. Signed-off-by:
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Adrian Hunter authored
Add helper reallocarray_as_needed() to reallocate an array to a larger size and initialize the extra entries to an arbitrary value. Signed-off-by:
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Adrian Hunter authored
When registering a guest machine using machine_pid from the id index, check perf.data for a matching kcore_dir subdirectory and set the kallsyms file name accordingly. If set, use it to find the machine's kernel symbols and object code (from kcore). Signed-off-by:
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Adrian Hunter authored
Copies of /proc/kallsyms, /proc/modules and an extract of /proc/kcore can be stored in the perf.data output directory under the subdirectory named kcore_dir. Guest machines will have their files also under subdirectories beginning kcore_dir__ followed by the machine pid. Make has_kcore_dir() return true also if there is a guest machine kcore_dir. Signed-off-by:
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Adrian Hunter authored
Copies of /proc/kallsyms, /proc/modules and an extract of /proc/kcore can be stored in the perf.data output directory under the subdirectory named kcore_dir. Guest machines will have their files also under subdirectories beginning kcore_dir__ followed by the machine pid. Remove these also when removing kcore_dir. Signed-off-by:
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Adrian Hunter authored
Add machine_pid and vcpu to the intel-pt-events.py script. Signed-off-by:
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Adrian Hunter authored
Add machine_pid and vcpu to python sample events and context switch events. Signed-off-by:
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Adrian Hunter authored
Add machine_pid and vcpu to struct perf_record_auxtrace_error. The existing fmt member is used to identify the new format. The new members make it possible to easily differentiate errors from guest machines. Signed-off-by:
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Adrian Hunter authored
Add machine_pid and vcpu to struct perf_dlfilter_sample. The 'size' can be used to determine if the values are present, however machine_pid is zero if unused in any case. vcpu should be ignored if machine_pid is zero. Signed-off-by:
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Adrian Hunter authored
Add fields machine_pid and vcpu. These are displayed only if machine_pid is non-zero. Signed-off-by:
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Adrian Hunter authored
If machine_pid is set, use it to find the guest machine. Signed-off-by:
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Adrian Hunter authored
When parsing a sample with a sample ID, copy machine_pid and vcpu from perf_sample_id to perf_sample. Note, machine_pid will be zero when unused, so only a non-zero value represents a guest machine. vcpu should be ignored if machine_pid is zero. Note also, machine_pid is used with events that have come from injecting a guest perf.data file, however guest events recorded on the host (i.e. using perf kvm) have the (QEMU) hypervisor process pid to identify them - refer machines__find_for_cpumode(). Signed-off-by:
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Adrian Hunter authored
It is possible to know which guest machine was running at a point in time based on the PID of the currently running host thread. That is, perf identifies guest machines by the PID of the hypervisor. To determine the guest CPU, put it on the hypervisor (QEMU) thread for that VCPU. This is done when processing the id_index which provides the necessary information. Signed-off-by:
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Adrian Hunter authored
Now that id_index has machine_pid, use it to create guest machines. Create the guest machines with an idle thread because guest events for "swapper" will be possible. Signed-off-by:
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Adrian Hunter authored
When injecting events from a guest perf.data file, the events will have separate sample ID numbers. These ID numbers can then be used to determine which machine an event belongs to. To facilitate that, add machine_pid and vcpu to id_index records. For backward compatibility, these are added at the end of the record, and the length of the record is used to determine if they are present or not. Note, this is needed because the events from a guest perf.data file contain the pid/tid of the process running at that time inside the VM not the pid/tid of the (QEMU) hypervisor thread. So a way is needed to relate guest events back to the guest machine and VCPU, and using sample ID numbers for that is relatively simple and convenient. Signed-off-by:
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Adrian Hunter authored
realname() returns NULL if the file is not in the file system, but we can still remove it from the build ID cache in that case, so continue and attempt the purge with the name provided. Signed-off-by:
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Adrian Hunter authored
When the guestmount option is used, a guest machine's file system mount point is recorded in machine->root_dir. perf already iterates guest machines when adding files to the build ID cache, but does not take machine->root_dir into account. Use machine->root_dir to find files for guest build IDs, and add them to the build ID cache using the "proper" name i.e. relative to the guest root directory not the host root directory. Signed-off-by:
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