- Apr 21, 2010
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Frederic Weisbecker authored
The ftrace_dump_on_oops kernel parameter, sysctl and sysrq let one dump every cpu buffers when an oops or panic happens. It's nice when you have few cpus but it may take ages if have many, plus you miss the real origin of the problem in all the cpu traces. Sometimes, all you need is to dump the cpu buffer that triggered the opps, most of the time it is our main interest. This patch modifies ftrace_dump_on_oops to handle this choice. The ftrace_dump_on_oops kernel parameter, when it comes alone, has the same behaviour than before. But ftrace_dump_on_oops=orig_cpu will only dump the buffer of the cpu that oops'ed. Similarly, sysctl kernel.ftrace_dump_on_oops=1 and echo 1 > /proc/sys/kernel/ftrace_dump_on_oops keep their previous behaviour. But setting 2 jumps into cpu origin dump mode. v2: Fix double setup v3: Fix spelling issues reported by Randy Dunlap v4: Also update __ftrace_dump in the selftests Signed-off-by:
Frederic Weisbecker <fweisbec@gmail.com> Acked-by:
David S. Miller <davem@davemloft.net> Acked-by:
Steven Rostedt <rostedt@goodmis.org> Cc: Ingo Molnar <mingo@elte.hu> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Li Zefan <lizf@cn.fujitsu.com> Cc: Lai Jiangshan <laijs@cn.fujitsu.com>
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- Feb 17, 2010
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Mike Frysinger authored
Most implementations of arch_syscall_addr() are the same, so create a default version in common code and move the one piece that differs (the syscall table) to asm/syscall.h. New arch ports don't have to waste time copying & pasting this simple function. The s390/sparc versions need to be different, so document why. Signed-off-by:
Mike Frysinger <vapier@gentoo.org> Acked-by:
Paul Mundt <lethal@linux-sh.org> Acked-by:
Heiko Carstens <heiko.carstens@de.ibm.com> Cc: Steven Rostedt <rostedt@goodmis.org> LKML-Reference: <1264498803-17278-1-git-send-email-vapier@gentoo.org> Signed-off-by:
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- Feb 09, 2010
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Daniel Mack authored
In particular, several occurances of funny versions of 'success', 'unknown', 'therefore', 'acknowledge', 'argument', 'achieve', 'address', 'beginning', 'desirable', 'separate' and 'necessary' are fixed. Signed-off-by:
Daniel Mack <daniel@caiaq.de> Cc: Joe Perches <joe@perches.com> Cc: Junio C Hamano <gitster@pobox.com> Signed-off-by:
Jiri Kosina <jkosina@suse.cz>
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- Jan 26, 2010
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Mike Frysinger authored
Update the graph tracer examples to cover the new frame pointer semantics (in terms of passing it along). Move the HAVE_FUNCTION_GRAPH_FP_TEST docs out of the Kconfig, into the right place, and expand on the details. Signed-off-by:
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Yang Hongyang authored
'ftrace' is no longer the name of the function tracer, to activate the function trace 'echo function > current_tracer' is to be used instead of 'echo ftrace > current_tracer'. Update the documentation to reflect the current implementation. Signed-off-by:
Yang Hongyang <yanghy@cn.fujitsu.com> LKML-Reference: <4B5D0BA8.20106@cn.fujitsu.com> Signed-off-by:
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- Jan 19, 2010
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Motohiro KOSAKI authored
Latest kprobetrace can remove probe points selectively, thus the documentation should be updated too. Signed-off-by:
KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com> Signed-off-by:
Masami Hiramatsu <mhiramat@redhat.com> Cc: systemtap <systemtap@sources.redhat.com> Cc: DLE <dle-develop@lists.sourceforge.net> LKML-Reference: <20100119023512.31880.35535.stgit@localhost6.localdomain6> Signed-off-by:
Ingo Molnar <mingo@elte.hu>
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Motohiro KOSAKI authored
Shell interprets $val as shell variable, thus we need quote if we use the echo command. Signed-off-by:
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- Jan 13, 2010
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Masami Hiramatsu authored
Drop function argument access syntax, because the function arguments depend on not only architecture but also compile-options and function API. And now, we have perf-probe for finding register/memory assigned to each argument. Signed-off-by:
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Masami Hiramatsu authored
Update example output in documentation according to current implementation. Signed-off-by:
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- Jan 11, 2010
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Randy Dunlap authored
Fix typos, grammos, spellos, hyphenation. Signed-off-by:
Randy Dunlap <randy.dunlap@oracle.com> Acked-by:
Andrew Morton <akpm@linux-foundation.org> Signed-off-by:
Linus Torvalds <torvalds@linux-foundation.org>
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- Dec 22, 2009
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Randy Dunlap authored
Clean up typos/grammos/spellos in events-kmem.txt. Signed-off-by:
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- Dec 19, 2009
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Randy Dunlap authored
Correct grammos. Spell out words. Add missing words. Consistent use of "mcount()" function name. Signed-off-by:
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Randy Dunlap authored
Fix grammar, spelling, punctuation, hyphenation, section numbering. Tell what PCL means. Signed-off-by:
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Randy Dunlap authored
Fix typos, spellos, hyphenation, line lengths. BTW: are there some userspace tools? There is a reference to some at the wiki page, but there are no tools listed there. Signed-off-by:
Pekka Paalanen <pq@iki.fi> LKML-Reference: <4B2C0D68.6080401@oracle.com> Signed-off-by:
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- Nov 04, 2009
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Masami Hiramatsu authored
Rename Kprobes-based event tracer to kprobes-based tracing event (kprobe-event), since it is not a tracer but an extensible tracing event interface. This also changes CONFIG_KPROBE_TRACER to CONFIG_KPROBE_EVENT and sets it y by default. Signed-off-by:
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- Oct 24, 2009
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Jiri Olsa authored
Trivial patch to fix a documentation example and to fix a comment. Signed-off-by:
Jiri Olsa <jolsa@redhat.com> Signed-off-by:
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- Oct 14, 2009
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Frederic Weisbecker authored
Document the arch needed requirements to get the support for syscalls tracing. v2: HAVE_FTRACE_SYSCALLS have been changed to HAVE_SYSCALL_TRACEPOINTS recently. Update this config name in the documentation then. Signed-off-by:
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- Oct 12, 2009
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Masami Hiramatsu authored
Rename special variables to more self-explainable names as below: - $rv to $retval - $sa to $stack - $aN to $argN - $sN to $stackN Signed-off-by:
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Masami Hiramatsu authored
Remove '$ra' (return address) because it is already shown at the head of each entry. Signed-off-by:
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Masami Hiramatsu authored
Add $ prefix to the special variables(e.g. sa, rv) of kprobe-tracer. This resolves consistency issues between kprobe_events and perf-kprobe. The main goal is to avoid conflicts between local variable names of probed functions, used by perf probe, and special variables used in the kprobe event creation interface (stack values, etc...) and also available from perf probe. ie: we don't want rv (return value) to conflict with a local variable named rv in a probed function. Signed-off-by:
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- Sep 22, 2009
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Mel Gorman authored
Knowing tracepoints exist is not quite the same as knowing what they should be used for. This patch adds a document giving a basic description of the kmem tracepoints and why they might be useful to a performance analyst. Signed-off-by:
Mel Gorman <mel@csn.ul.ie> Cc: Rik van Riel <riel@redhat.com> Reviewed-by:
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Mel Gorman authored
tracing, documentation: add a document describing how to do some performance analysis with tracepoints The documentation for ftrace, events and tracepoints is pretty extensive. Similarly, the perf PCL tools help files --help are there and the code simple enough to figure out what much of the switches mean. However, pulling the discrete bits and pieces together and translating that into "how do I solve a problem" requires a fair amount of imagination. This patch adds a simple document intended to get someone started on the Signed-off-by:
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Mel Gorman authored
This patch adds a simple post-processing script for the page-allocator-related trace events. It can be used to give an indication of who the most allocator-intensive processes are and how often the zone lock was taken during the tracing period. Example output looks like Process Pages Pages Pages Pages PCPU PCPU PCPU Fragment Fragment MigType Fragment Fragment Unknown details allocd allocd freed freed pages drains refills Fallback Causing Changed Severe Moderate under lock direct pagevec drain swapper-0 0 0 2 0 0 0 0 0 0 0 0 0 0 Xorg-3770 10603 5952 3685 6978 5996 194 192 0 0 0 0 0 0 modprobe-21397 51 0 0 86 31 1 0 0 0 0 0 0 0 xchat-5370 228 93 0 0 0 0 3 0 0 0 0 0 0 awesome-4317 32 32 0 0 0 0 32 0 0 0 0 0 0 thinkfan-3863 2 0 1 1 0 0 0 0 0 0 0 0 0 hald-addon-stor-3935 2 0 0 0 0 0 0 0 0 0 0 0 0 akregator-4506 1 1 0 0 0 0 1 0 0 0 0 0 0 xmms-14888 0 0 1 0 0 0 0 0 0 0 0 0 0 khelper-12 1 0 0 0 0 0 0 0 0 0 0 0 0 Optionally, the output can include information on the parent or aggregate based on process name instead of aggregating based on each pid. Example output including parent information and stripped out the PID looks something like; Process Pages Pages Pages Pages PCPU PCPU PCPU Fragment Fragment MigType Fragment Fragment Unknown details allocd allocd freed freed pages drains refills Fallback Causing Changed Severe Moderate under lock direct pagevec drain gdm-3756 :: Xorg-3770 3796 2976 99 3813 3224 104 98 0 0 0 0 0 0 init-1 :: hald-3892 1 0 0 0 0 0 0 0 0 0 0 0 0 git-21447 :: editor-21448 4 0 4 0 0 0 0 0 0 0 0 0 0 This says that Xorg allocated 3796 pages and it's parent process is gdm with a PID of 3756; The postprocessor parses the text output of tracing. While there is a binary format, the expectation is that the binary output can be readily translated into text and post-processed offline. Obviously if the text format changes, the parser will break but the regular expression parser is fairly rudimentary so should be readily adjustable. Signed-off-by:
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- Sep 21, 2009
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Michal Sojka authored
Signed-off-by:
Michal Sojka <sojkam1@fel.cvut.cz> Signed-off-by:
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Uwe Kleine-Koenig authored
Signed-off-by:
Uwe Kleine-Koenig <u.kleine-koenig@pengutronix.de> Signed-off-by:
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- Sep 19, 2009
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Arjan van de Ven authored
This patch converts the existing power tracer into an event tracer, so that power events (C states and frequency changes) can be tracked via "perf". This also removes the perl script that was used to demo the tracer; its functionality is being replaced entirely with timechart. Signed-off-by:
Arjan van de Ven <arjan@linux.intel.com> Acked-by:
Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: Paul Mackerras <paulus@samba.org> Cc: Frederic Weisbecker <fweisbec@gmail.com> LKML-Reference: <20090912130542.6d314860@infradead.org> Signed-off-by:
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- Sep 16, 2009
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Masami Hiramatsu authored
Disable newly created kprobe events by default, not to disturb another user using ftrace. "Disturb" means when someone is using ftrace and another user tries to use perf-tools, (in near future) if he defines new kprobe event via perf-tools, then new events will mess up the frace buffer. Fix this to allow proper and transparent kprobes events concurrent usage between ftrace users and perf users. Signed-off-by:
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Masami Hiramatsu authored
Support specifying a custom subsystem(group) for each kprobe event. This allows users to create new group to control several probes at once, or add events to existing groups as additional tracepoints. New synopsis: p[:[subsys/]event-name] KADDR|KSYM[+offs] [ARGS] Signed-off-by:
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- Sep 15, 2009
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GeunSik Lim authored
We need common default directory of denbugfs for consistency. (debugfs's default directory is /sys/kernel/debug/ by debugfs.) Signed-off-by:
GeunSik Lim <geunsik.lim@samsung.com> Signed-off-by:
Greg Kroah-Hartman <gregkh@suse.de>
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- Sep 14, 2009
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Mike Frysinger authored
While implementing function tracer and function tracer graph support, I found the exact arch implementation details to be a bit lacking (and my x86 foo ain't great). So after pounding out support for the Blackfin arch, start documenting the requirements/details. Signed-off-by:
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- Sep 12, 2009
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Tom Zanussi authored
Documentation for event filters and formats. v2 changes: fix a few problems noticed by Randy Dunlap. Reviewed-by:
Li Zefan <lizf@cn.fujitsu.com> Acked-by:
Tom Zanussi <tzanussi@gmail.com> LKML-Reference: <1252642431.8016.9.camel@tropicana> Signed-off-by:
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- Sep 10, 2009
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Masami Hiramatsu authored
Show event name in tracing/trace output. This also fixes kprobes events format to comply with other tracepoint events formats. Before patching: <...>-1447 [001] 1038282.286875: do_sys_open+0x0/0xd6: ... <...>-1447 [001] 1038282.286878: sys_openat+0xc/0xe <- do_sys_open: ... After patching: <...>-1447 [001] 1038282.286875: myprobe: (do_sys_open+0x0/0xd6) ... <...>-1447 [001] 1038282.286878: myretprobe: (sys_openat+0xc/0xe <- do_sys_open) ... Signed-off-by:
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Masami Hiramatsu authored
Add argument name assignment support and remove "alias" lines from format. This allows user to assign unique name to each argument. For example, $ echo p do_sys_open dfd=a0 filename=a1 flags=a2 mode=a3 > kprobe_events This assigns dfd, filename, flags, and mode to 1st - 4th arguments respectively. Trace buffer shows those names too. <...>-1439 [000] 1200885.933147: do_sys_open+0x0/0xdf: dfd=ffffff9c filename=bfa898ac flags=8000 mode=0 This helps users to know what each value means. Users can filter each events by these names too. Note that you can not filter by argN anymore. Signed-off-by:
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Masami Hiramatsu authored
Add *probe_profile_enable/disable to support kprobes raw events sampling from perf counters, like other ftrace events, when CONFIG_PROFILE_EVENT=y. Signed-off-by:
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Masami Hiramatsu authored
Prohibit user to specify negative offset from symbols. Since kprobe.offset is unsigned int, the offset must be always positive value. Signed-off-by:
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- Sep 04, 2009
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Albin Tonnerre authored
The latency_trace file got removed a while back by commit 886b5b73 and has been replaced by the latency-format option. This patch fixes the documentation by reflecting this change. Changes since v1: - mention that the trace format is configurable through the latency-format option - Fix a couple mistakes related to the timestamps Signed-off-by:
Albin Tonnerre <albin.tonnerre@free-electrons.com> Cc: Steven Rostedt <rostedt@goodmis.org> LKML-Reference: <20090831204007.GE4237@pc-ras4041.res.insa> Signed-off-by:
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- Aug 26, 2009
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Masami Hiramatsu authored
Add profiling interfaces for each kprobes event. This interface provides how many times each probe hit or missed. Signed-off-by:
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Masami Hiramatsu authored
Generate names for each kprobe event based on the probe point. (SYMBOL+offs or MEMADDR). Also remove generic k*probe event types because there is no user of those types. Signed-off-by:
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Masami Hiramatsu authored
Support up to 128 arguments to fetch for each kprobes event. Signed-off-by:
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Masami Hiramatsu authored
Add the documentation to use the kprobe based event tracer. [fweisbec@gmail.com: Split tracer and its Documentation in two patchs] Signed-off-by:
Ananth N Mavinakayanahalli <ananth@in.ibm.com> Cc: Avi Kivity <avi@redhat.com> Cc: Andi Kleen <ak@linux.intel.com> Cc: Christoph Hellwig <hch@infradead.org> Cc: Frank Ch. Eigler <fche@redhat.com> Cc: H. Peter Anvin <hpa@zytor.com> Cc: Ingo Molnar <mingo@elte.hu> Cc: Jason Baron <jbaron@redhat.com> Cc: Jim Keniston <jkenisto@us.ibm.com> Cc: K.Prasad <prasad@linux.vnet.ibm.com> Cc: Lai Jiangshan <laijs@cn.fujitsu.com> Cc: Li Zefan <lizf@cn.fujitsu.com> Cc: Przemysław Pawełczyk <przemyslaw@pawelczyk.it> Cc: Roland McGrath <roland@redhat.com> Cc: Sam Ravnborg <sam@ravnborg.org> Cc: Srikar Dronamraju <srikar@linux.vnet.ibm.com> Cc: Steven Rostedt <rostedt@goodmis.org> Cc: Tom Zanussi <tzanussi@gmail.com> Cc: Vegard Nossum <vegard.nossum@gmail.com> LKML-Reference: <20090813203510.31965.29123.stgit@localhost.localdomain> Signed-off-by:
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