- 04 Apr, 2023 30 commits
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Ian Rogers authored
Allow addr2line to be set either on the command line or via the perfconfig file. This doesn't currently work with llvm-addr2line as the addr2line code emits two things: 1) the address to decode, 2) a bogus ',' value. The expectation is the bogus value will generate: ?? ??:0 that terminates the addr2line reading. However, the output from llvm-addr2line is a single line with just the input ',' locking up the addr2line reading that is expecting a second line. Signed-off-by:
Ian Rogers <irogers@google.com> Cc: Adrian Hunter <adrian.hunter@intel.com> Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com> Cc: Andi Kleen <ak@linux.intel.com> Cc: Andres Freund <andres@anarazel.de> Cc: German Gomez <german.gomez@arm.com> Cc: Ingo Molnar <mingo@redhat.com> Cc: James Clark <james.clark@arm.com> Cc: Jiri Olsa <jolsa@kernel.org> Cc: Kan Liang <kan.liang@linux.intel.com> Cc: Mark Rutland <mark.rutland@arm.com> Cc: Namhyung Kim <namhyung@kernel.org> Cc: Nathan Chancellor <nathan@kernel.org> Cc: Nick Desaulniers <ndesaulniers@google.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Sandipan Das <sandipan.das@amd.com> Cc: Tom Rix <trix@redhat.com> Cc: llvm@lists.linux.dev Link: https://lore.kernel.org/r/20230328235543.1082207-2-irogers@google.comSigned-off-by:
Arnaldo Carvalho de Melo <acme@redhat.com>
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Ian Rogers authored
Allow the setting of the objdump command in the perfconfig. Update man page for this new option. Signed-off-by:
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Ian Rogers authored
Make struct annotation_options own the strings objdump_path and disassembler_style, freeing them on exit. Add missing strdup for disassembler_style when read from a config file. Committer notes: Converted free(obj->member) to zfree(&obj->member) in annotation_options__exit() Signed-off-by:
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Ian Rogers authored
The annotation__default_options global variable was used to initialize annotation_options. Switch to the init/exit pattern as later changes will give ownership over strings and this will be necessary to avoid memory leaks. Committer note: Fix the GTK2=1 build, hist_entry__gtk_annotate() needs to receive a 'struct annotation_options' pointer. Signed-off-by:
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Ian Rogers authored
If the default_sort_order isn't correctly strdup-ed warn and return an error. Debug warn if no option is matched. Signed-off-by:
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Ian Rogers authored
Use the debug build indicator as the guide to free the session. This implements a behavior described in a comment, which is consequentially removed. Signed-off-by:
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Adrian Hunter authored
do_realloc_array_as_needed() used memcpy() of zero size with a NULL pointer. Check the size first to avoid sanitize warning. Discovered using EXTRA_CFLAGS="-fsanitize=undefined -fsanitize=address". Reported-by:
kernel test robot <yujie.liu@intel.com> Signed-off-by:
Adrian Hunter <adrian.hunter@intel.com> Acked-by:
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Adrian Hunter authored
Use memcpy() to avoid unaligned access. Discovered using EXTRA_CFLAGS="-fsanitize=undefined -fsanitize=address". Fixes: ce4c8e79 ("perf symbols: Get symbols for .plt.got for x86-64") Reported-by:
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Adrian Hunter authored
Fix use-after-free in get_plt_got_name(). Discovered using EXTRA_CFLAGS="-fsanitize=undefined -fsanitize=address". Fixes: ce4c8e79 ("perf symbols: Get symbols for .plt.got for x86-64") Reported-by:
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Kajol Jain authored
Commit 3c22ba52 ("perf vendor events powerpc: Update POWER9 events") added and updated power9 PMU JSON events. However some of the JSON events which are part of other.json and pipeline.json files, contains UTF-8 characters in their brief description. Having UTF-8 character could breaks the perf build on some distros. Fix this issue by removing the UTF-8 characters from other.json and pipeline.json files. Result without the fix: [command]# file -i pmu-events/arch/powerpc/power9/* pmu-events/arch/powerpc/power9/cache.json: application/json; charset=us-ascii pmu-events/arch/powerpc/power9/floating-point.json: application/json; charset=us-ascii pmu-events/arch/powerpc/power9/frontend.json: application/json; charset=us-ascii pmu-events/arch/powerpc/power9/marked.json: application/json; charset=us-ascii pmu-events/arch/powerpc/power9/memory.json: application/json; charset=us-ascii pmu-events/arch/powerpc/power9/metrics.json: application/json; charset=us-ascii pmu-events/arch/powerpc/power9/nest_metrics.json: application/json; charset=us-ascii pmu-events/arch/powerpc/power9/other.json: application/json; charset=utf-8 pmu-events/arch/powerpc/power9/pipeline.json: application/json; charset=utf-8 pmu-events/arch/powerpc/power9/pmc.json: application/json; charset=us-ascii pmu-events/arch/powerpc/power9/translation.json: application/json; charset=us-ascii [command]# Result with the fix: [command]# file -i pmu-events/arch/powerpc/power9/* pmu-events/arch/powerpc/power9/cache.json: application/json; charset=us-ascii pmu-events/arch/powerpc/power9/floating-point.json: application/json; charset=us-ascii pmu-events/arch/powerpc/power9/frontend.json: application/json; charset=us-ascii pmu-events/arch/powerpc/power9/marked.json: application/json; charset=us-ascii pmu-events/arch/powerpc/power9/memory.json: application/json; charset=us-ascii pmu-events/arch/powerpc/power9/metrics.json: application/json; charset=us-ascii pmu-events/arch/powerpc/power9/nest_metrics.json: application/json; charset=us-ascii pmu-events/arch/powerpc/power9/other.json: application/json; charset=us-ascii pmu-events/arch/powerpc/power9/pipeline.json: application/json; charset=us-ascii pmu-events/arch/powerpc/power9/pmc.json: application/json; charset=us-ascii pmu-events/arch/powerpc/power9/translation.json: application/json; charset=us-ascii [command]# Fixes: 3c22ba52 ("perf vendor events powerpc: Update POWER9 events") Reported-by:
Arnaldo Carvalho de Melo <acme@kernel.com> Signed-off-by:
Kajol Jain <kjain@linux.ibm.com> Acked-by:
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Yang Jihong authored
If no target is specified for 'latency' subcommand, the execution fails because - 1 (invalid value) is written to set_ftrace_pid tracefs file. Make system wide the default target, which is the same as the default behavior of 'trace' subcommand. Before the fix: # perf ftrace latency -T schedule failed to set ftrace pid After the fix: # perf ftrace latency -T schedule ^C# DURATION | COUNT | GRAPH | 0 - 1 us | 0 | | 1 - 2 us | 0 | | 2 - 4 us | 0 | | 4 - 8 us | 2828 | #### | 8 - 16 us | 23953 | ######################################## | 16 - 32 us | 408 | | 32 - 64 us | 318 | | 64 - 128 us | 4 | | 128 - 256 us | 3 | | 256 - 512 us | 0 | | 512 - 1024 us | 1 | | 1 - 2 ms | 4 | | 2 - 4 ms | 0 | | 4 - 8 ms | 0 | | 8 - 16 ms | 0 | | 16 - 32 ms | 0 | | 32 - 64 ms | 0 | | 64 - 128 ms | 0 | | 128 - 256 ms | 4 | | 256 - 512 ms | 2 | | 512 - 1024 ms | 0 | | 1 - ... s | 0 | | Fixes: 53be5028 ("perf ftrace: Add 'latency' subcommand") Signed-off-by:Yang Jihong <yangjihong1@huawei.com> Acked-by:
Namhyung Kim <namhyung@kernel.org> Cc: Adrian Hunter <adrian.hunter@intel.com> Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com> Cc: Ian Rogers <irogers@google.com> Cc: Ingo Molnar <mingo@redhat.com> Cc: Jiri Olsa <jolsa@kernel.org> Cc: Mark Rutland <mark.rutland@arm.com> Cc: Peter Zijlstra <peterz@infradead.org> Link: https://lore.kernel.org/r/20230324032702.109964-1-yangjihong1@huawei.comSigned-off-by:
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Tiezhu Yang authored
This is a follow up patch for the execve bench which is actually fork + execve, it makes sense to add the fork syscall benchmark to compare the execve part precisely. Some archs have no __NR_fork definition which is used only as a check condition to call test_fork(), let us just define it as -1 to avoid build error. Suggested-by:
Tiezhu Yang <yangtiezhu@loongson.cn> Acked-by:
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Thomas Richter authored
Running command perf stat -vv -e cpu_cycles -C0 -- true displays this warning: Attempting to add event pmu 'cpum_cf' with 'cpu_cycles,' that may result in non-fatal errors Make the PMU cpum_cf selectable and avoid this warning. While at it also fix this warning for PMUs pai_crypto and pai_ext. Output before: # ./perf stat -vv -e cpu_cycles -C0 -- true Using CPUID IBM,3931,704,A01,3.7,002f Attempting to add event pmu 'cpum_cf' with 'cpu_cycles,' that may result in non-fatal errors After aliases, add event pmu 'cpum_cf' with 'event,' that may result in non-fatal errors cpu_cycles -> cpum_cf/event=0/ Control descriptor is not initialized ------------------------------------------------------------ perf_event_attr: type 10 size 128 config 0x1001 sample_type IDENTIFIER read_format TOTAL_TIME_ENABLED|TOTAL_TIME_RUNNING disabled 1 inherit 1 exclude_guest 1 ------------------------------------------------------------ sys_perf_event_open: pid -1 cpu 0 group_fd -1 flags 0x8 = 3 cpu_cycles: 0: 290434 2479172 2479172: cpu_cycles: 290434 2479172 2479172 Performance counter stats for 'CPU(s) 0': 290,434 cpu_cycles 0.002465617 seconds time elapsed # Now the warning "Attempting to add event pmu 'cpum_cf' ..." does not show up anymore. Output after: # ./perf stat -vv -e cpu_cycles -C0 -- true Using CPUID IBM,3931,704,A01,3.7,002f After aliases, add event pmu 'cpum_cf' with 'event,' that may result in non-fatal errors cpu_cycles -> cpum_cf/event=0/ Control descriptor is not initialized .... Performance counter stats for 'CPU(s) 0': 357,023 cpu_cycles 0.002454995 seconds time elapsed # Signed-off-by:Thomas Richter <tmricht@linux.ibm.com> Cc: Heiko Carstens <hca@linux.ibm.com> Cc: Sumanth Korikkar <sumanthk@linux.ibm.com> Cc: Sven Schnelle <svens@linux.ibm.com> Cc: Vasily Gorbik <gor@linux.ibm.com> Link: https://lore.kernel.org/r/20230316074946.41110-1-tmricht@linux.ibm.comSigned-off-by:
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Patrice Duroux authored
It's not 2&>1, the correct is 2>&1. Signed-off-by:
Patrice Duroux <patrice.duroux@gmail.com> Cc: linux-kselftest@vger.kernel.org Link: https://lore.kernel.org/r/20230303193058.21274-1-patrice.duroux@gmail.comSigned-off-by:
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Patrice Duroux authored
It's not 2&>1, the correct is 2>&1 Fixes: ade1d030 ("perf offcpu: Update offcpu test for child process") Signed-off-by:
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Ian Rogers authored
By detecting whether nvdimms are installed at runtime the number of events can be reduced if it isn't. These changes come from this PR: https://github.com/intel/perfmon/pull/63Reviewed-by:
Kan Liang <kan.liang@linux.intel.com> Signed-off-by:
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Ian Rogers authored
Add literal so that if nvdimms aren't installed we can record fewer events. The file detection mechanism was suggested by Dan Williams <dan.j.williams@intel.com> in: https://lore.kernel.org/linux-perf-users/641bbe1eced26_1b98bb29440@dwillia2-xfh.jf.intel.com.notmuch/Reviewed-by:
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Ian Rogers authored
Adds BR_MISP_EXEC.INDIRECT event. Reviewed-by:
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Ian Rogers authored
Adds BR_MISP_EXEC.INDIRECT event. Reviewed-by:
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Ian Rogers authored
Updates descriptions and encodings. Adds BR_MISP_EXEC.INDIRECT events. Reviewed-by:
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Ian Rogers authored
Updates descriptions and encodings. Adds BR_MISP_EXEC.INDIRECT events. Reviewed-by:
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Ian Rogers authored
Updates descriptions and encodings. Adds BR_MISP_EXEC.INDIRECT events. Reviewed-by:
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Ian Rogers authored
Updates descriptions and encodings. Adds BR_MISP_EXEC.INDIRECT events. Reviewed-by:
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Ian Rogers authored
Description updates and formatting changes. Reviewed-by:
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Namhyung Kim authored
I got a report of a msan failure like below: $ sudo perf lock con -ab -- sleep 1 ... ==224416==WARNING: MemorySanitizer: use-of-uninitialized-value #0 0x5651160d6c96 in lock_contention_read util/bpf_lock_contention.c:290:8 #1 0x565115f90870 in __cmd_contention builtin-lock.c:1919:3 #2 0x565115f90870 in cmd_lock builtin-lock.c:2385:8 #3 0x565115f03a83 in run_builtin perf.c:330:11 #4 0x565115f03756 in handle_internal_command perf.c:384:8 #5 0x565115f02d53 in run_argv perf.c:428:2 #6 0x565115f02d53 in main perf.c:562:3 #7 0x7f43553bc632 in __libc_start_main #8 0x565115e865a9 in _start It was because the 'key' variable is not initialized. Actually it'd be set by bpf_map_get_next_key() but msan didn't seem to understand it. Let's make msan happy by initializing the variable. Signed-off-by: -
Thomas Richter authored
Commit 7f76b311 ("perf list: Add IBM z16 event description for s390") contains the verbal description for z16 extended counter set. However some entries of the public description contain UTF-8 characters which breaks the build on some distros. Fix this and remove the UTF-8 characters. Fixes: 7f76b311 ("perf list: Add IBM z16 event description for s390") Reported-by:
Heiko Carstens <hca@linux.ibm.com> Signed-off-by:
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Namhyung Kim authored
The earlier commit f0cdde28 ("perf hist: Improve srcfile sort key performance") updated the srcfile logic but missed to change the ->cmp() callback which is called for every sample. It should use the same logic like in the srcline to speed up the processing because it'd return the same information repeatedly for the same address. The real processing will be done in sort__srcfile_collapse(). Fixes: f0cdde28 ("perf hist: Improve srcfile sort key performance") Signed-off-by:
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Thomas Richter authored
The test case "perf test 'Setup struct perf_event_attr'" is failing. On s390 this output is observed: # ./perf test -Fvvvv 17 17: Setup struct perf_event_attr : --- start --- running './tests/attr/test-stat-C0' Using CPUID IBM,8561,703,T01,3.6,002f ..... Event event:base-stat fd = 1 group_fd = -1 flags = 0|8 cpu = * type = 0 size = 128 <<<--- wrong, specified in file base-stat config = 0 sample_period = 0 sample_type = 65536 ... 'PERF_TEST_ATTR=/tmp/tmpgw574wvg ./perf stat -o \ /tmp/tmpgw574wvg/perf.data -e cycles -C 0 kill >/dev/null \ 2>&1 ret '1', expected '1' loading result events Event event-0-0-4 fd = 4 group_fd = -1 cpu = 0 pid = -1 flags = 8 type = 0 size = 136 <<<--- actual size used in system call ..... compare matching [event-0-0-4] to [event:base-stat] [cpu] 0 * [flags] 8 0|8 [type] 0 0 [size] 136 128 ->FAIL match: [event-0-0-4] matches [] expected size=136, got 128 FAILED './tests/attr/test-stat-C0' - match failure This mismatch is caused by commit 09519ec3 ("perf: Add perf_event_attr::config3") which enlarges the structure perf_event_attr by 8 bytes. Fix this by adjusting the expected value of size. Output after: # ./perf test -Fvvvv 17 17: Setup struct perf_event_attr : --- start --- running './tests/attr/test-stat-C0' Using CPUID IBM,8561,703,T01,3.6,002f ... matched compare matching [event-0-0-4] to [event:base-stat] [cpu] 0 * [flags] 8 0|8 [type] 0 0 [size] 136 136 .... ->OK match: [event-0-0-4] matches ['event:base-stat'] matched Fixes: 09519ec3 ("perf: Add perf_event_attr::config3") Signed-off-by: -
Ian Rogers authored
The warning advises on the NO_BPF_SKEL=1 option. Suggested-by:
Stephen Rothwell <sfr@canb.auug.org.au> Signed-off-by:
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Artem Savkov authored
Append information about inlined functions to FP and LBR callchains from DWARF debuginfo when available. Do so by calling append_inlines() from add_callchain_ip(). Testing it: Frame-pointer mode recorded with 'perf record --call-graph=fp --freq=max -- ./a.out' #include <stdio.h> #include <stdint.h> static __attribute__((noinline)) uint32_t func5(uint32_t i) { return i + 10; } static uint32_t func4(uint32_t i) { return func5(i + 5); } static inline uint32_t func3(uint32_t i) { return func4(i + 4); } static __attribute__((noinline)) uint32_t func2(uint32_t i) { return func3(i + 3); } static uint32_t func1(uint32_t i) { return func2(i + 2); } __attribute__((noinline)) uint64_t entry(void) { uint64_t ret = 0; uint32_t i = 0; for (i = 0; i < 1000000; i++) { ret += func1(i); ret -= func2(i); ret += func3(i); ret += func4(i); ret -= func5(i); } return ret; } int main(int argc, char **argv) { printf("%s\n", __func__); return entry(); } ====== Here is the output I get with '--call-graph callee --no-children' ====== # To display the perf.data header info, please use --header/--header-only options. # # # Total Lost Samples: 0 # # Samples: 250 of event 'cycles:u' # Event count (approx.): 26819859 # # Overhead Command Shared Object Symbol # ........ ....... .................... ..................................... # 43.58% a.out a.out [.] func5 | |--28.93%--entry | main | __libc_start_call_main | --14.65%--func4 (inlined) | |--10.45%--entry | main | __libc_start_call_main | --4.20%--func3 (inlined) entry main __libc_start_call_main 38.80% a.out a.out [.] entry | |--23.27%--func4 (inlined) | | | |--20.28%--func3 (inlined) | | func2 | | main | | __libc_start_call_main | | | --2.99%--entry | main | __libc_start_call_main | |--8.17%--func5 | main | __libc_start_call_main | |--3.89%--func1 (inlined) | entry | main | __libc_start_call_main | --3.48%--entry main __libc_start_call_main 13.07% a.out a.out [.] func2 | ---func5 main __libc_start_call_main 1.54% a.out [unknown] [k] 0xffffffff81e011b7 1.16% a.out [unknown] [k] 0xffffffff81e00193 | --0.57%--__mmap64 (inlined) __mmap64 (inlined) 0.34% a.out ld-linux-x86-64.so.2 [.] __tunable_get_val 0.34% a.out ld-linux-x86-64.so.2 [.] strcmp 0.32% a.out libc.so.6 [.] strchr 0.31% a.out ld-linux-x86-64.so.2 [.] _dl_relocate_object 0.22% a.out ld-linux-x86-64.so.2 [.] _dl_init_paths 0.18% a.out ld-linux-x86-64.so.2 [.] get_common_cache_info.constprop.0 0.14% a.out ld-linux-x86-64.so.2 [.] __GI___tunables_init # # (Tip: Show individual samples with: perf script) # ====== It does not seem to be out of order, or at least it is consistent with what I get with dwarf unwinders. Committer notes: Adrian Hunter pointed out that this breaks --branch-history, so don't do it for branches, see the second Link below. Suggested-by:Andrii Nakryiko <andrii.nakryiko@gmail.com> Signed-off-by: <asavkov@redhat.com> Acked-by:
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- 21 Mar, 2023 5 commits
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Rob Herring authored
perf_event_attr has gained a new field, config3, so add support for it extending the existing configN support. Signed-off-by:
Rob Herring <robh@kernel.org> Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com> Cc: James Clark <james.clark@arm.com> Cc: Jiri Olsa <jolsa@kernel.org> Cc: Leo Yan <leo.yan@linaro.org> Cc: Mark Rutland <mark.rutland@arm.com> Cc: Namhyung Kim <namhyung@kernel.org> Cc: Peter Zijlstra <peterz@infradead.org> Link: http://lore.kernel.org/lkml/20220914-arm-perf-tool-spe1-2-v2-v5-2-2cf5210b2f77@kernel.orgSigned-off-by:
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James Clark authored
Generated from the telemetry solution repo[1] with this command: ./generate.py <linux-repo>/tools/perf/ --telemetry-files \ ../../data/pmu/cpu/neoverse/neoverse-n1.json Since this data source now includes the SPE events for N1, it has diverged from A76 which means the folder has to be split. The new data also uses more fine grained grouping, but this will be consistent for all future products. Long PublicDescriptions are now included even for common events because this can include product specific details. For non verbose mode the common BriefDescriptions remain the same. [1]: https://gitlab.arm.com/telemetry-solution/telemetry-solutionSigned-off-by:James Clark <james.clark@arm.com> Acked-by:
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Bernhard M. Wiedemann authored
Without this, pmu-events.c would be generated with variations in ordering depending on non-deterministic filesystem readdir order. I tested that pmu-events.c still has the same number of lines and that perf list output works. This patch was done while working on reproducible builds for openSUSE, but also solves issues in Debian [1] and other distributions. [1] https://tests.reproducible-builds.org/debian/rb-pkg/unstable/i386/linux.htmlSigned-off-by:
Bernhard M. Wiedemann <bwiedemann@suse.de> Cc: Ian Rogers <irogers@google.com> Link: https://lore.kernel.org/r/20230321063032.19804-1-bwiedemann@suse.deSigned-off-by:
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Leo Yan authored
It's good not to release resources for a program when kernel cleans up memory space, this patch explicitly releases histograms entries with hists__delete_entries(). Committer notice: This helps with memory leak checkers, but may delay exiting a tool by doing needless linked list traversals freeing lots of objects. Signed-off-by:
Leo Yan <leo.yan@linaro.org> Acked-by:
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Leo Yan authored
hists__add_entry_ops() doesn't allocate a new histogram entry if it has an existing entry for a KVM event, in this case, find_create_kvm_event() allocates a 'struct kvm_info' but it's not used by any histograms and never freed. To fix the memory leak, this patch first introduces a refcnt and a set of functions for refcnt operations on 'struct kvm_info'. When the data structure is not anymore used (the refcnt hits zero) kvm_info__zput() will free the memory used. Committer: Provide a nop version of kvm_info__zput() to be used when HAVE_KVM_STAT_SUPPORT isn't defined as it is used unconditionally in hists__findnew_entry() and hist_entry__delete(). Signed-off-by:
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- 20 Mar, 2023 5 commits
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German Gomez authored
Add 'simd' sort field to visualize SIMD ops in 'perf report'. Rows are labeled with the SIMD ISA, and the type of predicate (if any): - [p] partial predicate - [e] empty predicate (no elements in the vector being used) Example with Arm SPE and SVE (Scalable Vector Extension): #include <arm_sve.h> double src[1025], dst[1025]; int main(void) { svfloat64_t vc = svdup_f64(1); for(;;) for(int i = 0; i < 1025; i += svcntd()) { svbool_t pg = svwhilelt_b64(i, 1025); svfloat64_t vsrc = svld1(pg, &src[i]); svfloat64_t vdst = svadd_x(pg, vsrc, vc); svst1(pg, &dst[i], vdst); } return 0; } ... compiled using "gcc-11 -march=armv8-a+sve -O3" Profiling on a platform that implements FEAT_SVE and FEAT_SPEv1p1: $ perf record -e arm_spe_0// -- ./a.out $ perf report --itrace=i1i -s overhead,pid,simd,sym Overhead Pid:Command Simd Symbol ........ ................ ....... ...................... 53.76% 10758:program [.] main 46.14% 10758:program [.] SVE [.] main 0.09% 10758:program [p] SVE [.] main The report shows 0.09% of the sampled SVE operations use partial predicates due to src and dst arrays not being multiples of the vector register lengths. Signed-off-by:German Gomez <german.gomez@arm.com> Acked-by:
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German Gomez authored
Add flags from the Scalable Vector Extension (SVE) to the SPE samples which are available from Armv8.3 (FEAT_SPEv1p1). These will be displayed in a new SIMD sort field in a later commit. Signed-off-by:
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German Gomez authored
Extend the decoder of Arm SPE records to support more fields from the operation packet type. Not all fields are being decoded by this commit. Only those needed to support the use-case SVE load/store/other operations. Suggested-by:
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German Gomez authored
Add new field to 'struct perf_sample' to store flags related to SIMD ops. It will be used to store SIMD information from SVE and NEON when profiling using ARM SPE. Signed-off-by:
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Adrian Hunter authored
Intel Flexible Return and Event Delivery (FRED) adds instructions ERETS (return to supervisor) and ERETU (return to user). Intel PT instruction decoder needs to know about these instructions because they are branch instructions. Similar to IRET instructions, when the decoder encounters one of these instructions it will match it to a TIP (target instruction pointer) packet that informs what the branch destination is. The existing "x86 instruction decoder - new instructions" test can be used to test the result e.g. $ perf test -v ins |& grep eret Decoded ok: f2 0f 01 ca erets Decoded ok: f3 0f 01 ca eretu Signed-off-by:
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