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Adrian Hunter b4b046ff9e perf intel-pt: Add a config for max loops without consuming a packet 
The Intel PT decoder limits the number of unconditional branches (e.g.
jmps) decoded without consuming any trace packets. Generally, a loop
needs a conditional branch which generates a TNT packet, whereas a "ret"
instruction will generate a TIP or TNT packet. So exceeding the limit is
assumed to be a never-ending loop, which can happen if there has been a
decoding error putting the decoder at the wrong place in the code.

Up until now, the limit of 10000 has been enough but some analytic
purposes have been reported to exceed that.

Increase the limit to 100000, and make it configurable via perf config
intel-pt.max-loops. Also amend the "Never-ending loop" message to
mention the configuration entry.

Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
Reviewed-by: Andi Kleen <ak@linux.intel.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Link: http://lore.kernel.org/lkml/20210701175132.3977-1-adrian.hunter@intel.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
 		2021-07-07 11:40:56 -03:00
..
Build.txt perf tools: Add doc about how to build perf with Asan and UBSan 2019-03-19 16:52:04 -03:00
Makefile perf doc: allow ASCIIDOC_EXTRA to be an argument 2020-04-18 09:05:00 -03:00
android.txt perf tools: Update android build documentation 2016-07-04 20:27:27 -03:00
asciidoc.conf perf docs: Allow man page date to be specified 2019-09-27 09:26:14 -03:00
asciidoctor-extensions.rb perf Documentation: Support for asciidoctor 2018-04-26 13:47:10 -03:00
build-xed.txt perf script: Add --insn-trace for instruction decoding 2018-10-24 15:29:50 -03:00
callchain-overhead-calculation.txt perf tools: Document --children option in more detail 2015-04-29 10:38:06 -03:00
db-export.txt perf db-export: Add brief documentation 2019-06-05 09:47:57 -03:00
examples.txt perf tools: Replace lkml.org links with lore 2021-02-11 12:54:27 -03:00
intel-bts.txt perf tools: Add Intel BTS support 2015-08-21 11:34:10 -03:00
intel-hybrid.txt perf Documentation: Document intel-hybrid support 2021-04-29 10:31:00 -03:00
intel-pt.txt perf intel-pt: Update intel-pt.txt file with new location of the documentation 2020-03-11 11:00:33 -03:00
itrace.txt perf auxtrace: Add Z itrace option for timeless decoding 2021-05-12 12:43:10 -03:00
jit-interface.txt perf symbols: Add description of JIT interface 2012-08-13 14:55:02 -03:00
jitdump-specification.txt perf docs: Correct and clarify jitdump spec 2019-09-30 17:29:51 -03:00
manpage-1.72.xsl
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manpage-base.xsl
…
manpage-bold-literal.xsl
…
manpage-normal.xsl
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manpage-suppress-sp.xsl
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perf-annotate.txt perf annotate: Add itrace options support 2021-06-16 15:07:42 -03:00
perf-archive.txt perf archive: Remove duplicated 'runs' in man page 2013-12-09 15:21:45 -03:00
perf-bench.txt perf bench: Add basic syscall benchmark 2020-07-28 08:50:48 -03:00
perf-buildid-cache.txt perf tools: Fix various typos in comments 2021-03-23 17:13:43 -03:00
perf-buildid-list.txt perf report: Accept fifos as input file 2011-12-23 17:01:03 -02:00
perf-c2c.txt perf c2c: Update documentation for metrics reorganization 2020-10-15 12:02:12 -03:00
perf-config.txt perf intel-pt: Add a config for max loops without consuming a packet 2021-07-07 11:40:56 -03:00
perf-daemon.txt perf daemon: Add examples to man page 2021-02-11 10:19:52 -03:00
perf-data.txt perf data: Add JSON export 2021-04-29 10:30:58 -03:00
perf-diff.txt perf diff: Support hot streams comparison 2020-10-14 13:34:48 -03:00
perf-dlfilter.txt perf dlfilter: Add object_code() to perf_dlfilter_fns 2021-07-01 16:14:38 -03:00
perf-evlist.txt perf tools: Fix documentation of verbose options 2021-03-06 16:54:26 -03:00
perf-ftrace.txt perf tools: Fix documentation of verbose options 2021-03-06 16:54:26 -03:00
perf-help.txt
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perf-inject.txt perf inject: Add --vm-time-correlation option 2021-05-12 12:43:10 -03:00
perf-intel-pt.txt perf scripting python: intel-pt-events.py: Add --insn-trace and --src-trace 2021-06-01 10:05:20 -03:00
perf-iostat.txt perf stat: Enable iostat mode for x86 platforms 2021-04-20 08:40:20 -03:00
perf-kallsyms.txt perf tools: Fix documentation of verbose options 2021-03-06 16:54:26 -03:00
perf-kmem.txt perf kmem: Document a missing option & an argument 2018-02-16 14:55:42 -03:00
perf-kvm.txt perf kvm: Clarify the 'perf kvm' -i and -o command line options 2019-12-02 15:38:59 -03:00
perf-list.txt perf tools: Add support for exclusive groups/events 2020-10-14 12:24:28 -03:00
perf-lock.txt perf lock: Document missing options 2017-11-16 14:50:04 -03:00
perf-mem.txt perf mem: Support data page size 2021-01-20 14:34:20 -03:00
perf-probe.txt perf probe: Add permission and sysctl notice to man page 2021-06-04 10:24:38 -03:00
perf-record.txt perf Documentation: Document intel-hybrid support 2021-04-29 10:31:00 -03:00
perf-report.txt perf report: Add --skip-empty option to suppress 0 event stat 2021-04-29 10:30:59 -03:00
perf-sched.txt perf sched timehist: Add support for filtering on CPU 2020-01-06 11:46:09 -03:00
perf-script-perl.txt perf tools: Correct title markers for asciidoctor 2018-03-07 10:26:32 -03:00
perf-script-python.txt perf scripting python: Update documentation for srcline etc 2021-06-01 10:04:57 -03:00
perf-script.txt perf script: Add option to pass arguments to dlfilters 2021-07-01 16:14:37 -03:00
perf-stat.txt perf Documentation: Document intel-hybrid support 2021-04-29 10:31:00 -03:00
perf-test.txt perf test: Add -F/--dont-fork option 2016-06-30 18:27:45 -03:00
perf-timechart.txt perf timechart: Document missing --force option 2017-11-16 14:50:06 -03:00
perf-top.txt perf top: Add cgroup support for perf top (-G) 2021-06-24 15:33:35 -03:00
perf-trace.txt perf tools: Fix documentation of verbose options 2021-03-06 16:54:26 -03:00
perf-version.txt perf version: Add man page 2018-04-02 13:52:23 -03:00
perf.data-directory-format.txt perf record: Put a copy of kcore into the perf.data directory 2019-11-06 15:43:05 -03:00
perf.data-file-format.txt perf header: Support HYBRID_CPU_PMU_CAPS feature 2021-05-17 10:58:10 -03:00
perf.txt perf docs: Add man pages to see also 2021-03-02 09:37:38 -03:00
perfconfig.example perf config: Show default report configuration in example and docs 2016-09-01 09:44:13 -03:00
security.txt perf docs: Introduce security.txt file to document related issues 2020-05-28 10:03:26 -03:00
tips.txt perf tools: Fix typos / broken sentences 2019-07-02 16:08:16 -03:00
topdown.txt perf tools: Update topdown documentation to permit rdpmc calls 2021-04-22 16:09:39 -03:00