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* perf symbols: Allow lookups by symbol name tooArnaldo Carvalho de Melo2009-12-125-41/+163
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Configurable via symbol_conf.sort_by_name, so that the cost of an extra rb_node on all 'struct symbol' instances is not paid by tools that only want to decode addresses. How to use it: symbol_conf.sort_by_name = true; symbol_init(&symbol_conf); struct map *map = map_groups__find_by_name(kmaps, MAP__VARIABLE, "[kernel.kallsyms]"); if (map == NULL) { pr_err("couldn't find map!\n"); kernel_maps__fprintf(stdout); } else { struct symbol *sym = map__find_symbol_by_name(map, sym_filter, NULL); if (sym == NULL) pr_err("couldn't find symbol %s!\n", sym_filter); else pr_info("symbol %s: %#Lx-%#Lx \n", sym_filter, sym->start, sym->end); } Looking over the vmlinux/kallsyms is common enough that I'll add a variable to the upcoming struct perf_session to avoid the need to use map_groups__find_by_name to get the main vmlinux/kallsyms map. The above example looks on the 'variable' symtab, but it is just like that for the functions one. Also the sort operation is done when we first use map__find_symbol_by_name, in a lazy way. Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com> Cc: Frédéric Weisbecker <fweisbec@gmail.com> Cc: Masami Hiramatsu <mhiramat@redhat.com> Cc: Mike Galbraith <efault@gmx.de> Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: Paul Mackerras <paulus@samba.org> LKML-Reference: <1260564622-12392-1-git-send-email-acme@infradead.org> Signed-off-by: Ingo Molnar <mingo@elte.hu>
* perf symbols: Add missing "Variables" entry to map_type__nameArnaldo Carvalho de Melo2009-12-121-0/+1
| | | | | | | | | | Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com> Cc: Frédéric Weisbecker <fweisbec@gmail.com> Cc: Mike Galbraith <efault@gmx.de> Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: Paul Mackerras <paulus@samba.org> LKML-Reference: <1260552208-6824-1-git-send-email-acme@infradead.org> Signed-off-by: Ingo Molnar <mingo@elte.hu>
* perf symbols: Add support for 'variable' symtabsArnaldo Carvalho de Melo2009-12-122-16/+53
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Example: { u64 addr = strtoull(sym_filter, NULL, 16); struct map *map = map_groups__find(kmaps, MAP__VARIABLE, addr); if (map == NULL) pr_err("couldn't find map!\n"); else { struct symbol *sym = map__find_symbol(map, addr, NULL); if (sym == NULL) pr_err("couldn't find addr!\n"); else pr_info("addr %#Lx is in %s global var\n", addr, sym->name); } exit(0); } Added just after symbol__init() call in 'perf top', then: { u64 addr = strtoull(sym_filter, NULL, 16); struct map *map = map_groups__find(kmaps, MAP__VARIABLE, addr); if (map == NULL) pr_err("couldn't find map!\n"); else { struct symbol *sym = map__find_symbol(map, addr, NULL); if (sym == NULL) pr_err("couldn't find addr!\n"); else pr_info("addr %#Lx is in %s global var\n", addr, sym->name); } exit(0); } [root@doppio linux-2.6-tip]# grep ' [dD] ' /proc/kallsyms | grep ' sched' ffffffff817827d8 d sched_nr_latency ffffffff81782ce0 d sched_domains_mutex ffffffff8178c070 d schedstr.22423 ffffffff817909a0 d sched_register_mutex ffffffff81823490 d sched_feat_names ffffffff81823558 d scheduler_running ffffffff818235b8 d sched_clock_running ffffffff818235bc D sched_clock_stable ffffffff81824f00 d sched_switch_trace [root@doppio linux-2.6-tip]# perf top -s 0xffffffff817827d9 addr 0xffffffff817827d9 is in sched_nr_latency global var [root@doppio linux-2.6-tip]# perf top -s ffffffff81782ce0 addr 0xffffffff81782ce0 is in sched_domains_mutex global var [root@doppio linux-2.6-tip]# [root@doppio linux-2.6-tip]# perf top -s ffffffff81782ce0 --vmlinux OFF The file OFF cannot be used, trying to use /proc/kallsyms...addr 0xffffffff81782ce0 is in sched_domains_mutex global var [root@doppio linux-2.6-tip]# perf top -s ffffffff818235bc --vmlinux OFF The file OFF cannot be used, trying to use /proc/kallsyms...addr 0xffffffff818235bc is in sched_clock_stable global var [root@doppio linux-2.6-tip]# So it works with both /proc/kallsyms and with ELF symtabs, either the one on the vmlinux explicitely passed via --vmlinux or in one in the vmlinux_path that matches the buildid for the running kernel or the one found in the buildid header section in a perf.data file. Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com> Cc: Frédéric Weisbecker <fweisbec@gmail.com> Cc: Mike Galbraith <efault@gmx.de> Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: Paul Mackerras <paulus@samba.org> LKML-Reference: <1260550239-5372-4-git-send-email-acme@infradead.org> Signed-off-by: Ingo Molnar <mingo@elte.hu>
* perf symbols: Introduce ELF counterparts to symbol_type__is_aArnaldo Carvalho de Melo2009-12-121-2/+22
| | | | | | | | | | | | For selecting the right types of symbols in ELF symtabs. Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com> Cc: Frédéric Weisbecker <fweisbec@gmail.com> Cc: Mike Galbraith <efault@gmx.de> Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: Paul Mackerras <paulus@samba.org> LKML-Reference: <1260550239-5372-3-git-send-email-acme@infradead.org> Signed-off-by: Ingo Molnar <mingo@elte.hu>
* perf symbols: Introduce symbol_type__is_aArnaldo Carvalho de Melo2009-12-122-6/+13
| | | | | | | | | | | | | | For selecting the right types of symbols in /proc/kallsyms, will be followed by elf_symbol_type__is_a, for the same purpose on ELF symtabs. Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com> Cc: Frédéric Weisbecker <fweisbec@gmail.com> Cc: Mike Galbraith <efault@gmx.de> Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: Paul Mackerras <paulus@samba.org> LKML-Reference: <1260550239-5372-2-git-send-email-acme@infradead.org> Signed-off-by: Ingo Molnar <mingo@elte.hu>
* perf symbols: Rename kthreads to kmaps, using another abstraction for itArnaldo Carvalho de Melo2009-12-126-85/+106
| | | | | | | | | | | | | | | | | | | | | | | | | | Using a struct thread instance just to hold the kernel space maps (vmlinux + modules) is overkill and confuses people trying to understand the perf symbols abstractions. The kernel maps are really present in all threads, i.e. the kernel is a library, not a separate thread. So introduce the 'map_groups' abstraction and use it for the kernel maps, now in the kmaps global variable. It, in turn, will move, together with the threads list to the perf_file abstraction, so that we can support multiple perf_file instances, needed by perf diff. Brainstormed-with: Eduardo Habkost <ehabkost@redhat.com> Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com> Cc: Eduardo Habkost <ehabkost@redhat.com> Cc: Frédéric Weisbecker <fweisbec@gmail.com> Cc: Mike Galbraith <efault@gmx.de> Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: Paul Mackerras <paulus@samba.org> LKML-Reference: <1260550239-5372-1-git-send-email-acme@infradead.org> Signed-off-by: Ingo Molnar <mingo@elte.hu>
* perf tools: Allow building for ARMJamie Iles2009-12-111-0/+12
| | | | | | | | | | | | | | | | | Add definitions of rmb() and cpu_relax() and include the ARM unistd.h header. The __kuser_memory_barrier helper in the helper page is used to provide the correct memory barrier depending on the CPU type. [ The rmb() will work on v6 and v7, segfault on v5. Dynamic detection to add v5 support will be added later. ] Signed-off-by: Jamie Iles <jamie.iles@picochip.com> Cc: Russell King <linux@arm.linux.org.uk> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Mikael Pettersson <mikpe@it.uu.se> LKML-Reference: <1260534009-5394-1-git-send-email-jamie.iles@picochip.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
* perf tools: Allow cross compilingJamie Iles2009-12-111-2/+4
| | | | | | | | | | | | | | For embedded platforms, we want to be able to build the perf tools on a build machine to run on a different arch. This patch allows $CROSS_COMPILE to set the cross compiler. Additionally, if NO_LIBPERL is set, then don't use perl include paths as they will be for the host arch. Signed-off-by: Jamie Iles <jamie.iles@picochip.com> Cc: Peter Zijlstra <peterz@infradead.org> LKML-Reference: <1260523260-15694-2-git-send-email-jamie.iles@picochip.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
* perf kmem: Fix unused argument build warningIngo Molnar2009-12-101-2/+2
| | | | | | | | | | | | | | Fix: builtin-kmem.c: In function 'parse_caller_opt': builtin-kmem.c:690: error: unused parameter 'arg' builtin-kmem.c: In function 'parse_alloc_opt': builtin-kmem.c:697: error: unused parameter 'arg' Cc: Li Zefan <lizf@cn.fujitsu.com> Cc: Pekka Enberg <penberg@cs.helsinki.fi> LKML-Reference: <4B20A195.8030106@cn.fujitsu.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
* perf symbols: perf_header__read_build_ids() offset'n'size should be u64Arnaldo Carvalho de Melo2009-12-102-3/+3
| | | | | | | | | | | | | | | | | | | | | | | | As off_t is a long, so breaking things on 32-bit land. Now buildids work on 32-bit land. [root@ana ~]# uname -a Linux ana.ghostprotocols.net 2.6.31.6-162.fc12.i686 #1 SMP Fri Dec 4 01:09:09 EST 2009 i686 i686 i386 GNU/Linux [root@ana ~]# perf buildid-list | tail -5 136ee6792ba2ae57870ecd87369f4ae3194d5b27 /lib/libreadline.so.6.0 d202dcb1ad48d140065783657d37ae3f2d9ab83f /usr/bin/gdb 0a56c0c00dcc2e9e581ae9997f31957c9c4671df /usr/lib/libdwarf.so.0.0 5f9e6ac95241cbb3227608e0ff2a2e0cbbe72439 /home/acme/bin/perf 925d19eccc2ddb1c9d74dd178a011426f1b124a8 /bin/sleep [root@ana ~]# Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com> Cc: Frédéric Weisbecker <fweisbec@gmail.com> Cc: Mike Galbraith <efault@gmx.de> Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: Paul Mackerras <paulus@samba.org> LKML-Reference: <1260396578-19116-2-git-send-email-acme@infradead.org> Signed-off-by: Ingo Molnar <mingo@elte.hu>
* perf symbols: dsos__read_build_ids() should read both user and kernel buildidsArnaldo Carvalho de Melo2009-12-101-2/+3
| | | | | | | | | | Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com> Cc: Frédéric Weisbecker <fweisbec@gmail.com> Cc: Mike Galbraith <efault@gmx.de> Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: Paul Mackerras <paulus@samba.org> LKML-Reference: <1260396578-19116-1-git-send-email-acme@infradead.org> Signed-off-by: Ingo Molnar <mingo@elte.hu>
* perf tools: Align long options which have no short formsLi Zefan2009-12-101-0/+3
| | | | | | | | | | | | | | | | | | | | | Before: $ ./perf kmem ... -l, --line <num> show n lines --raw-ip show raw ip instead of symbol After: $ ./perf kmem ... -l, --line <num> show n lines --raw-ip show raw ip instead of symbol Signed-off-by: Li Zefan <lizf@cn.fujitsu.com> Cc: Pekka Enberg <penberg@cs.helsinki.fi> LKML-Reference: <4B20A1A9.3040104@cn.fujitsu.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
* perf kmem: Show usage if no option is specifiedLi Zefan2009-12-102-28/+37
| | | | | | | | | | | As Ingo suggested, make "perf kmem" show help information. "perf kmem stat [--caller] [--alloc] .." will show memory statistics. Signed-off-by: Li Zefan <lizf@cn.fujitsu.com> Acked-by: Pekka Enberg <penberg@cs.helsinki.fi> LKML-Reference: <4B20A195.8030106@cn.fujitsu.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
* perf sched: Add max delay time snapshotFrederic Weisbecker2009-12-101-6/+10
| | | | | | | | | | | | | | | | When we have a maximum latency reported for a task, we need a convenient way to find the matching location to the raw traces or to perf sched map that shows where the task has been eventually scheduled in. This gives a pointer to retrieve the events that occured during this max latency. Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com> Reviewed-by: Xiao Guangrong <xiaoguangrong@cn.fujitsu.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Arnaldo Carvalho de Melo <acme@redhat.com> Cc: Paul Mackerras <paulus@samba.org> LKML-Reference: <1260391208-6808-1-git-send-regression-fweisbec@gmail.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
* perf tools: Correct size given to memsetJulia Lawall2009-12-102-2/+2
| | | | | | | | | | | | | | | | | | | | | | | | | | Memset should be given the size of the structure, not the size of the pointer. The semantic patch that makes this change is as follows: (http://coccinelle.lip6.fr/) // <smpl> @@ type T; T *x; expression E; @@ memset(x, E, sizeof( + * x)) // </smpl> Signed-off-by: Julia Lawall <julia@diku.dk> Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: Paul Mackerras <paulus@samba.org> LKML-Reference: <Pine.LNX.4.64.0912092026000.1870@ask.diku.dk> Signed-off-by: Ingo Molnar <mingo@elte.hu>
* perf sched: Fix for getting task's execution timeXiao Guangrong2009-12-091-28/+27
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | In current code, task's execute time is got by reading '/proc/<pid>/sched' file, it's wrong if the task is created by pthread_create(), because every thread task has same pid. This way also has two demerits: 1: 'perf sched replay' can't work if the kernel is not compiled with the 'CONFIG_SCHED_DEBUG' option 2: perf tool should depend on proc file system So, this patch uses PERF_COUNT_SW_TASK_CLOCK to get task's execution time instead of reading /proc file. Changelog v2 -> v3: use PERF_COUNT_SW_TASK_CLOCK instead of rusage() as Ingo's suggestion Reported-by: Torok Edwin <edwintorok@gmail.com> Signed-off-by: Xiao Guangrong <xiaoguangrong@cn.fujitsu.com> Cc: Xiao Guangrong <ericxiao.gr@gmail.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Frederic Weisbecker <fweisbec@gmail.com> Cc: Paul Mackerras <paulus@samba.org> LKML-Reference: <4B1F7322.80103@cn.fujitsu.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
* perf probe: Update perf-probe documentMasami Hiramatsu2009-12-091-5/+16
| | | | | | | | | | | | | | | | | | | | | | Add --list and --del option descriptions to perf-probe.txt. Signed-off-by: Masami Hiramatsu <mhiramat@redhat.com> Cc: Steven Rostedt <rostedt@goodmis.org> Cc: Jim Keniston <jkenisto@us.ibm.com> Cc: Ananth N Mavinakayanahalli <ananth@in.ibm.com> Cc: Christoph Hellwig <hch@infradead.org> Cc: Frank Ch. Eigler <fche@redhat.com> Cc: Frederic Weisbecker <fweisbec@gmail.com> Cc: Jason Baron <jbaron@redhat.com> Cc: K.Prasad <prasad@linux.vnet.ibm.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Srikar Dronamraju <srikar@linux.vnet.ibm.com> Cc: Arnaldo Carvalho de Melo <acme@redhat.com> Cc: systemtap <systemtap@sources.redhat.com> Cc: DLE <dle-develop@lists.sourceforge.net> Cc: Frederic Weisbecker <fweisbec@gmail.com> LKML-Reference: <20091208220330.10142.73296.stgit@dhcp-100-2-132.bos.redhat.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
* perf probe: Support --del optionMasami Hiramatsu2009-12-093-7/+96
| | | | | | | | | | | | | | | | | | | | | | | | Support perf probe --del <event> option. Currently, perf probe can have only one event for each --del option. If you'd like to delete several probe events, you need to specify --del for each events. Signed-off-by: Masami Hiramatsu <mhiramat@redhat.com> Cc: Steven Rostedt <rostedt@goodmis.org> Cc: Jim Keniston <jkenisto@us.ibm.com> Cc: Ananth N Mavinakayanahalli <ananth@in.ibm.com> Cc: Christoph Hellwig <hch@infradead.org> Cc: Frank Ch. Eigler <fche@redhat.com> Cc: Frederic Weisbecker <fweisbec@gmail.com> Cc: Jason Baron <jbaron@redhat.com> Cc: K.Prasad <prasad@linux.vnet.ibm.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Srikar Dronamraju <srikar@linux.vnet.ibm.com> Cc: Arnaldo Carvalho de Melo <acme@redhat.com> Cc: systemtap <systemtap@sources.redhat.com> Cc: DLE <dle-develop@lists.sourceforge.net> LKML-Reference: <20091208220323.10142.62079.stgit@dhcp-100-2-132.bos.redhat.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
* perf probe: Support vmlinux on cwd by defaultMasami Hiramatsu2009-12-091-4/+6
| | | | | | | | | | | | | | | | | | | | | | | Support vmlinux on current working direcotry by default and also update file-open messages. Now perf probe searches ./vmlinux too. Signed-off-by: Masami Hiramatsu <mhiramat@redhat.com> Cc: Steven Rostedt <rostedt@goodmis.org> Cc: Jim Keniston <jkenisto@us.ibm.com> Cc: Ananth N Mavinakayanahalli <ananth@in.ibm.com> Cc: Christoph Hellwig <hch@infradead.org> Cc: Frank Ch. Eigler <fche@redhat.com> Cc: Frederic Weisbecker <fweisbec@gmail.com> Cc: Jason Baron <jbaron@redhat.com> Cc: K.Prasad <prasad@linux.vnet.ibm.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Srikar Dronamraju <srikar@linux.vnet.ibm.com> Cc: Arnaldo Carvalho de Melo <acme@redhat.com> Cc: systemtap <systemtap@sources.redhat.com> Cc: DLE <dle-develop@lists.sourceforge.net> LKML-Reference: <20091208220309.10142.33040.stgit@dhcp-100-2-132.bos.redhat.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
* perf probe: Remove event suffix number _0Masami Hiramatsu2009-12-091-1/+10
| | | | | | | | | | | | | | | | | | | | | | | | Remove event suffix number _0 if it is the first. The first event has no suffix, and from the second, each event has suffix number counted from _1. This reduces typing cost :-). Signed-off-by: Masami Hiramatsu <mhiramat@redhat.com> Cc: Steven Rostedt <rostedt@goodmis.org> Cc: Jim Keniston <jkenisto@us.ibm.com> Cc: Ananth N Mavinakayanahalli <ananth@in.ibm.com> Cc: Christoph Hellwig <hch@infradead.org> Cc: Frank Ch. Eigler <fche@redhat.com> Cc: Frederic Weisbecker <fweisbec@gmail.com> Cc: Jason Baron <jbaron@redhat.com> Cc: K.Prasad <prasad@linux.vnet.ibm.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Srikar Dronamraju <srikar@linux.vnet.ibm.com> Cc: Arnaldo Carvalho de Melo <acme@redhat.com> Cc: systemtap <systemtap@sources.redhat.com> Cc: DLE <dle-develop@lists.sourceforge.net> LKML-Reference: <20091208220301.10142.50031.stgit@dhcp-100-2-132.bos.redhat.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
* perf probe: Fix add-probe command syntax without --add optionMasami Hiramatsu2009-12-091-7/+26
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Fix add-probe command syntax without --add option. perf-probe supports add-probe command without --add option. But it treats each argument as an event definition. e.g. perf probe func arg1 arg2 is interpreted as perf probe --add func --add arg1 --add arg2 But it may be useless in many cases. This patch fixes this syntax to fold those arguments into one event definition if there is no --add option. With this change, above command is interpreted as below; perf probe --add "func arg1 arg2" Signed-off-by: Masami Hiramatsu <mhiramat@redhat.com> Cc: Steven Rostedt <rostedt@goodmis.org> Cc: Jim Keniston <jkenisto@us.ibm.com> Cc: Ananth N Mavinakayanahalli <ananth@in.ibm.com> Cc: Christoph Hellwig <hch@infradead.org> Cc: Frank Ch. Eigler <fche@redhat.com> Cc: Frederic Weisbecker <fweisbec@gmail.com> Cc: Jason Baron <jbaron@redhat.com> Cc: K.Prasad <prasad@linux.vnet.ibm.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Srikar Dronamraju <srikar@linux.vnet.ibm.com> Cc: Arnaldo Carvalho de Melo <acme@redhat.com> Cc: systemtap <systemtap@sources.redhat.com> Cc: DLE <dle-develop@lists.sourceforge.net> LKML-Reference: <20091208220254.10142.73767.stgit@dhcp-100-2-132.bos.redhat.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
* perf probe: Change probe-added message more user-friendlyMasami Hiramatsu2009-12-091-5/+10
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Change probe-added message more user-friendly expression and show usage of new events. Before: Added new event: p:probe/schedule_0 schedule+10 prev=%ax cpu=%bx After: Added new event: probe:schedule_1 (on schedule+1 with prev cpu) You can now use it on all perf tools, such as: perf record -e probe:schedule_1 -a sleep 1 Signed-off-by: Masami Hiramatsu <mhiramat@redhat.com> Cc: Steven Rostedt <rostedt@goodmis.org> Cc: Jim Keniston <jkenisto@us.ibm.com> Cc: Ananth N Mavinakayanahalli <ananth@in.ibm.com> Cc: Christoph Hellwig <hch@infradead.org> Cc: Frank Ch. Eigler <fche@redhat.com> Cc: Frederic Weisbecker <fweisbec@gmail.com> Cc: Jason Baron <jbaron@redhat.com> Cc: K.Prasad <prasad@linux.vnet.ibm.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Srikar Dronamraju <srikar@linux.vnet.ibm.com> Cc: Arnaldo Carvalho de Melo <acme@redhat.com> Cc: systemtap <systemtap@sources.redhat.com> Cc: DLE <dle-develop@lists.sourceforge.net> LKML-Reference: <20091208220247.10142.91642.stgit@dhcp-100-2-132.bos.redhat.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
* perf probe: Change event list formatMasami Hiramatsu2009-12-091-2/+25
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Change event list format for user readability. perf probe --list shows event list in "[GROUP:EVENT] EVENT-DEFINITION" format, but this format is different from the output of perf-list, and EVENT-DEFINITION is a bit blunt. This patch changes the format to more user friendly one. Before: [probe:schedule_0] schedule+10 prev cpu After: probe:schedule_0 (on schedule+10 with prev cpu) Signed-off-by: Masami Hiramatsu <mhiramat@redhat.com> Cc: Steven Rostedt <rostedt@goodmis.org> Cc: Jim Keniston <jkenisto@us.ibm.com> Cc: Ananth N Mavinakayanahalli <ananth@in.ibm.com> Cc: Christoph Hellwig <hch@infradead.org> Cc: Frank Ch. Eigler <fche@redhat.com> Cc: Frederic Weisbecker <fweisbec@gmail.com> Cc: Jason Baron <jbaron@redhat.com> Cc: K.Prasad <prasad@linux.vnet.ibm.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Srikar Dronamraju <srikar@linux.vnet.ibm.com> Cc: Arnaldo Carvalho de Melo <acme@redhat.com> Cc: systemtap <systemtap@sources.redhat.com> Cc: DLE <dle-develop@lists.sourceforge.net> LKML-Reference: <20091208220240.10142.42916.stgit@dhcp-100-2-132.bos.redhat.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
* perf probe: Use pr_debug for debug messageMasami Hiramatsu2009-12-071-2/+2
| | | | | | | | | | | | | Use pr_debug() for "missing vmlinux" debugging message. Signed-off-by: Masami Hiramatsu <mhiramat@redhat.com> Cc: systemtap <systemtap@sources.redhat.com> Cc: DLE <dle-develop@lists.sourceforge.net> Cc: Frederic Weisbecker <fweisbec@gmail.com> Cc: Arnaldo Carvalho de Melo <acme@redhat.com> Cc: Frederic Weisbecker <fweisbec@gmail.com> LKML-Reference: <20091207170059.19230.51459.stgit@dhcp-100-2-132.bos.redhat.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
* perf probe: Check e_snprintf() format stringMasami Hiramatsu2009-12-071-1/+4
| | | | | | | | | | | | | | Check e_snprintf() format string by gcc, and fix a bug of e_snprintf() caller. Signed-off-by: Masami Hiramatsu <mhiramat@redhat.com> Cc: systemtap <systemtap@sources.redhat.com> Cc: DLE <dle-develop@lists.sourceforge.net> Cc: Frederic Weisbecker <fweisbec@gmail.com> Cc: Arnaldo Carvalho de Melo <acme@redhat.com> Cc: Frederic Weisbecker <fweisbec@gmail.com> LKML-Reference: <20091207170053.19230.7690.stgit@dhcp-100-2-132.bos.redhat.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
* perf probe: Fix event namelist to duplicate stringMasami Hiramatsu2009-12-071-1/+3
| | | | | | | | | | | | | | | | | Fix event namelist to duplicate string. Without duplicating, adding multiple probes causes stack overwrite bug, because it reuses a buffer on stack while the buffer is already added in the namelist. String duplication solves this bug because only contents of the buffer is copied to the namelist. Signed-off-by: Masami Hiramatsu <mhiramat@redhat.com> Cc: systemtap <systemtap@sources.redhat.com> Cc: DLE <dle-develop@lists.sourceforge.net> Cc: Frederic Weisbecker <fweisbec@gmail.com> Cc: Arnaldo Carvalho de Melo <acme@redhat.com> Cc: Frederic Weisbecker <fweisbec@gmail.com> LKML-Reference: <20091207170046.19230.55557.stgit@dhcp-100-2-132.bos.redhat.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
* perf probe: Fix strtailcmp() to compare s1and s2[0]Juha Leppanen2009-12-071-1/+1
| | | | | | | | | | | | | | | Fix strtailcmp() to compare s1[0] and s2[0]. strtailcmp() returns 0 if "a" and "b" or "a" and "ab", it's a wrong behavior. This patch fixes it. Signed-off-by: "Juha Leppanen" <juha_motorsportcom@luukku.com> Acked-by: Masami Hiramatsu <mhiramat@redhat.com> Cc: systemtap <systemtap@sources.redhat.com> Cc: DLE <dle-develop@lists.sourceforge.net> Cc: Juha Leppanen <juha_motorsportcom@luukku.com> Cc: Frederic Weisbecker <fweisbec@gmail.com> LKML-Reference: <20091207170040.19230.37464.stgit@dhcp-100-2-132.bos.redhat.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
* perf tools: Optimize parse_subsystem_tracepoint_event()Ulrich Drepper2009-12-071-12/+3
| | | | | | | | | | | | | | | | | | | Uses of strcat are almost always signs that someone is too lazy to think about the code a bit more carefully. One always has to know about the lengths of the strings involved to avoid buffer overflows. This is one case where the size of the object code for me is reduced by 38 bytes. The code should also be faster, especially if flags is non-NULL. Signed-off-by: Ulrich Drepper <drepper@redhat.com> Cc: a.p.zijlstra@chello.nl Cc: fweisbec@gmail.com Cc: jaswinderrajput@gmail.com Cc: paulus@samba.org LKML-Reference: <200912061825.nB6IPUa1023306@hs20-bc2-1.build.redhat.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
* perf trace/scripting: Don't display 'scripting unsupported' msg unnecessarilyTom Zanussi2009-12-071-9/+55
| | | | | | | | | | | | | | | | The 'scripting unsupported' message should only be displayed when the -s or -g options are used, and not when they aren't, as the current code does. Signed-off-by: Tom Zanussi <tzanussi@gmail.com> Cc: rostedt@goodmis.org Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: Mike Galbraith <efault@gmx.de> Cc: Paul Mackerras <paulus@samba.org> Cc: Arnaldo Carvalho de Melo <acme@redhat.com> Cc: Frederic Weisbecker <fweisbec@gmail.com> LKML-Reference: <1260163919-6679-3-git-send-email-tzanussi@gmail.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
* perf trace/scripting: Fix compile error when libperl not installedTom Zanussi2009-12-072-3/+4
| | | | | | | | | | | | | | | When I added the xs callbacks into perf, I forgot to re-check the no-libperl case. This patch fixes the undefined reference error for that. Reported-by: Arnaldo Carvalho de Melo <acme@ghostprotocols.net> Signed-off-by: Tom Zanussi <tzanussi@gmail.com> Cc: Frederic Weisbecker <fweisbec@gmail.com> Cc: Mike Galbraith <efault@gmx.de> Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: Paul Mackerras <paulus@samba.org> LKML-Reference: <1260153712.6564.4.camel@tropicana> Signed-off-by: Ingo Molnar <mingo@elte.hu>
* perf_event: Eliminate raw->sizeXiao Guangrong2009-12-072-76/+56
| | | | | | | | | | | | | raw->size is not used, this patch just cleans it up. Signed-off-by: Xiao Guangrong <xiaoguangrong@cn.fujitsu.com> Cc: Frederic Weisbecker <fweisbec@gmail.com> Cc: Paul Mackerras <paulus@samba.org> Cc: OGAWA Hirofumi <hirofumi@mail.parknet.co.jp> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Li Zefan <lizf@cn.fujitsu.com> LKML-Reference: <4B1C8CC4.4050007@cn.fujitsu.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
* perf_event: Fix __dsos__write_buildid_table()Xiao Guangrong2009-12-071-1/+1
| | | | | | | | | | | | | | | | | The remain buff size is 'len - pos->long_name_len - 1', not 'len - pos->long_name_len + 1' This bug was introduced by commit 7691b1e ("perf tools: Misc small fixes"). Signed-off-by: Xiao Guangrong <xiaoguangrong@cn.fujitsu.com> Acked-by: OGAWA Hirofumi <hirofumi@mail.parknet.co.jp> Cc: Frederic Weisbecker <fweisbec@gmail.com> Cc: Paul Mackerras <paulus@samba.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Li Zefan <lizf@cn.fujitsu.com> LKML-Reference: <4B1C7F73.80707@cn.fujitsu.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
* perf_event: Fix raw event processingXiao Guangrong2009-12-072-6/+16
| | | | | | | | | | | | | | | | | | | | We use 'data.raw_data' parameter to call process_raw_event(), but data.raw_data buffer not include data size. it can make perf tool crash. This bug was introduced by commit 180f95e29a ("perf: Make common SAMPLE_EVENT parser"). Signed-off-by: Xiao Guangrong <xiaoguangrong@cn.fujitsu.com> Cc: Pekka Enberg <penberg@cs.helsinki.fi> Cc: Eduard - Gabriel Munteanu <eduard.munteanu@linux360.ro> Cc: Frederic Weisbecker <fweisbec@gmail.com> Cc: Paul Mackerras <paulus@samba.org> Cc: OGAWA Hirofumi <hirofumi@mail.parknet.co.jp> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Li Zefan <lizf@cn.fujitsu.com> LKML-Reference: <4B1C7F45.5080105@cn.fujitsu.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
* perf/sched: Fix 'perf sched trace'Xiao Guangrong2009-12-071-7/+7
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | If we use 'perf sched trace', it will call symbol__init() again, and can lead to a perf tool crash: [root@localhost perf]# ./perf sched trace *** glibc detected *** ./perf: free(): invalid next size (normal): 0x094c1898 *** ======= Backtrace: ========= /lib/libc.so.6[0xb7602404] /lib/libc.so.6(cfree+0x96)[0xb76043b6] ./perf[0x80730fe] ./perf[0x8074c97] ./perf[0x805eb59] ./perf[0x80536fd] ./perf[0x804b618] ./perf[0x804bdc3] /lib/libc.so.6(__libc_start_main+0xe5)[0xb75a9735] ./perf[0x804af81] ======= Memory map: ======== 08048000-08158000 r-xp 00000000 fe:00 556831 /home/eric/.... 08158000-08168000 rw-p 0010f000 fe:00 556831 /home/eric/... 08168000-085fe000 rw-p 00000000 00:00 0 094ab000-094cc000 rw-p 00000000 00:00 0 [heap] Signed-off-by: Xiao Guangrong <xiaoguangrong@cn.fujitsu.com> LKML-Reference: <4B1C7EE1.8030906@cn.fujitsu.com> Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: Mike Galbraith <efault@gmx.de> Cc: Paul Mackerras <paulus@samba.org> Cc: Arnaldo Carvalho de Melo <acme@redhat.com> Cc: Frederic Weisbecker <fweisbec@gmail.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
* perf buildid-list: Fix copy'n'paste help messageArnaldo Carvalho de Melo2009-12-061-1/+1
| | | | | | | | | | Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com> Cc: Frédéric Weisbecker <fweisbec@gmail.com> Cc: Mike Galbraith <efault@gmx.de> Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: Paul Mackerras <paulus@samba.org> LKML-Reference: <1260129790-11520-1-git-send-email-acme@infradead.org> Signed-off-by: Ingo Molnar <mingo@elte.hu>
* perf tools: Misc small fixesOGAWA Hirofumi2009-12-063-4/+10
| | | | | | | | | | | | | | | | | | | | | | - util/header.c "len" is aligned to 64. So, it tries to write the out of long_name buffer. So, this use "zero_buf" to write aligned area. - util/trace-event-read.c "size" is not including nul byte. So, this allocates it, and set '\0'. - util/trace-event-parse.c It needs parens to calc correct size. Signed-off-by: OGAWA Hirofumi <hirofumi@mail.parknet.co.jp> Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: Paul Mackerras <paulus@samba.org> Cc: Arnaldo Carvalho de Melo <acme@redhat.com> Cc: Frederic Weisbecker <fweisbec@gmail.com> LKML-Reference: <87d42s8iiu.fsf_-_@devron.myhome.or.jp> Signed-off-by: Ingo Molnar <mingo@elte.hu>
* perf: Make common SAMPLE_EVENT parserOGAWA Hirofumi2009-12-067-146/+155
| | | | | | | | | | | | | | | | | | | | | | Currently, sample event data is parsed for each commands, and it is assuming that the data is not including other data. (E.g. timechart, trace, etc. can't parse the event if it has PERF_SAMPLE_CALLCHAIN) So, even if we record the superset data for multiple commands at a time, commands can't parse. etc. To fix it, this makes common sample event parser, and use it to parse sample event correctly. (PERF_SAMPLE_READ is unsupported for now though, it seems to be not using.) Signed-off-by: OGAWA Hirofumi <hirofumi@mail.parknet.co.jp> Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: Paul Mackerras <paulus@samba.org> Cc: Arnaldo Carvalho de Melo <acme@redhat.com> Cc: Frederic Weisbecker <fweisbec@gmail.com> LKML-Reference: <87hbs48imv.fsf@devron.myhome.or.jp> Signed-off-by: Ingo Molnar <mingo@elte.hu>
* perf timechart: Fix header handlingOGAWA Hirofumi2009-12-061-4/+8
| | | | | | | | | | | | | | | Update "struct trace_entry" to match with current one. And remove "size" field from it. If it has "size", it become cause of alignment mismatch of structure with kernel. Signed-off-by: OGAWA Hirofumi <hirofumi@mail.parknet.co.jp> Acked-by: Arjan van de Ven <arjan@infradead.org> Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: Paul Mackerras <paulus@samba.org> LKML-Reference: <87ljhg8ioe.fsf@devron.myhome.or.jp> Signed-off-by: Ingo Molnar <mingo@elte.hu>
* perf tools: Correct size computation in tracepoint_id_to_path()Julia Lawall2009-12-061-1/+1
| | | | | | | | | | | | | | | | | | | | | | | | | | | | The size argument to zalloc should be the size of desired structure, not the pointer to it. The semantic patch that makes this change is as follows: (http://coccinelle.lip6.fr/) // <smpl> @expression@ expression *x; @@ x = <+... -sizeof(x) +sizeof(*x) ...+>// </smpl> Signed-off-by: Julia Lawall <julia@diku.dk> Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: Mike Galbraith <efault@gmx.de> Cc: Paul Mackerras <paulus@samba.org> Cc: Arnaldo Carvalho de Melo <acme@redhat.com> Cc: Frederic Weisbecker <fweisbec@gmail.com> LKML-Reference: <Pine.LNX.4.64.0912061016120.20858@ask.diku.dk> Signed-off-by: Ingo Molnar <mingo@elte.hu>
* Merge branch 'perf/scripting' into perf/coreIngo Molnar2009-12-0331-15/+2458
|\ | | | | | | | | | | Merge reason: it's ready for v2.6.33. Signed-off-by: Ingo Molnar <mingo@elte.hu>
| * perf trace/scripting: Add Fedora libperl install note to docTom Zanussi2009-11-302-3/+5
| | | | | | | | | | | | | | | | | | | | | | | | | | | | Fedora needs perl-ExtUtils-Embed for Perl scripting, which also brings along libperl-devel; note this info for the convenience of Fedora users. Signed-off-by: Tom Zanussi <tzanussi@gmail.com> Cc: fweisbec@gmail.com Cc: rostedt@goodmis.org Cc: anton@samba.org Cc: hch@infradead.org LKML-Reference: <1259565529-6407-5-git-send-email-tzanussi@gmail.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
| * perf trace/scripting: Fix Perl common_* access functionsTom Zanussi2009-11-304-24/+24
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | The common_* functions (e.g. common_pc(), etc) are exported as common_* but named get_common_*, resulting in unresolved subroutine errors when executing scripts. Make the internal and external names match. Signed-off-by: Tom Zanussi <tzanussi@gmail.com> Cc: fweisbec@gmail.com Cc: rostedt@goodmis.org Cc: anton@samba.org Cc: hch@infradead.org LKML-Reference: <1259565529-6407-4-git-send-email-tzanussi@gmail.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
| * perf trace/scripting: Ignore shadowed variable warning for perf-trace-perl.cTom Zanussi2009-11-301-1/+1
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | The debugging versions of the ENTER and LEAVE internal perl macros, used when embedding perl, define a local block with a my_perl perl variable that shadows a global variable of the same name, which is also the name expected by the embedding API for the embedded interpreter. Since we don't have control over the code generated in this case (it's an externality) and can't get rid of the warning, ignore it. Signed-off-by: Tom Zanussi <tzanussi@gmail.com> Cc: fweisbec@gmail.com Cc: rostedt@goodmis.org Cc: anton@samba.org Cc: hch@infradead.org LKML-Reference: <1259565529-6407-3-git-send-email-tzanussi@gmail.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
| * perf trace/scripting: Silence PERL_EMBED_* backtick errorsTom Zanussi2009-11-301-2/+2
| | | | | | | | | | | | | | | | | | | | | | | | | | | | The backtick shell substitutions for PERL_EMBED_LDOPT/CCOPT make a lot of noise on stderr if Embed.pm isn't installed - this silences them. Signed-off-by: Tom Zanussi <tzanussi@gmail.com> Cc: fweisbec@gmail.com Cc: rostedt@goodmis.org Cc: anton@samba.org Cc: hch@infradead.org LKML-Reference: <1259565529-6407-2-git-send-email-tzanussi@gmail.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
| * perf scripting: Fix buildIngo Molnar2009-11-281-0/+2
| | | | | | | | | | | | | | | | | | | | Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: Mike Galbraith <efault@gmx.de> Cc: Paul Mackerras <paulus@samba.org> Cc: Arnaldo Carvalho de Melo <acme@redhat.com> Cc: Frederic Weisbecker <fweisbec@gmail.com> LKML-Reference: <new-submission> Signed-off-by: Ingo Molnar <mingo@elte.hu>
| * perf trace: Add a scripts/perl/bin for perf trace shell scriptsTom Zanussi2009-11-2810-0/+45
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | To capture the relevant events for a given Perl script and to avoid having to continually remember and type in long command-lines, add a scripts/perl/bin directory containing two simple shell scripts for each Perl script, one for recording and one for processing/display. For example, to record perf data for the rw-by-pid.pl script, run scripts/perl/bin/rw-by-pid-record and to actually run the script and display the output run scripts/perl/bin/rw-by-pid-report. Signed-off-by: Tom Zanussi <tzanussi@gmail.com> Cc: fweisbec@gmail.com Cc: rostedt@goodmis.org Cc: anton@samba.org Cc: hch@infradead.org LKML-Reference: <1259133352-23685-8-git-send-email-tzanussi@gmail.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
| * perf trace: Add Documentation for perf trace Perl supportTom Zanussi2009-11-282-1/+229
| | | | | | | | | | | | | | | | | | | | | | | | | | Adds perf-trace-perl Documentation and a link to it from the perf-trace page. Signed-off-by: Tom Zanussi <tzanussi@gmail.com> Cc: fweisbec@gmail.com Cc: rostedt@goodmis.org Cc: anton@samba.org Cc: hch@infradead.org LKML-Reference: <1259133352-23685-7-git-send-email-tzanussi@gmail.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
| * perf trace: Add interface to access perf data from Perl handlersTom Zanussi2009-11-2813-13/+474
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | The Perl scripting support for perf trace allows most of a trace event's data to be accessed directly as handler arguments, but not all of it e.g. the less common fields aren't passed in. To give scripts access to the other fields and/or any other data or metadata in the main perf executable that might be useful, a way to access the C data in perf from Perl is needed; this patch uses the Perl XS facility to do it for the common_xxx event fields not passed to handler functions. Context.pm exports three functions to Perl scripts that access fields for the current event by calling back into perf: common_pc(), common_flags() and common_lock_depth(). Support for common_flags() field values was added to Core.pm and a script used to sanity check these and other basic scripting features, check-perf-trace.pl, was also added. Signed-off-by: Tom Zanussi <tzanussi@gmail.com> Cc: fweisbec@gmail.com Cc: rostedt@goodmis.org Cc: anton@samba.org Cc: hch@infradead.org LKML-Reference: <1259133352-23685-6-git-send-email-tzanussi@gmail.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
| * perf trace: Add perf trace scripting support modules for PerlTom Zanussi2009-11-289-0/+806
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Add Perf-Trace-Util Perl module and some scripts that use it. Core.pm contains Perl code to define and access flag and symbolic fields. Util.pm contains general-purpose utility functions. Also adds some makefile bits to install them in libexec/perf-core/scripts/perl (or wherever perfexec_instdir points). Signed-off-by: Tom Zanussi <tzanussi@gmail.com> Cc: fweisbec@gmail.com Cc: rostedt@goodmis.org Cc: anton@samba.org Cc: hch@infradead.org LKML-Reference: <1259133352-23685-5-git-send-email-tzanussi@gmail.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
| * perf trace: Add Perl scripting supportTom Zanussi2009-11-286-5/+629
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Implement trace_scripting_ops to make Perl a supported perf trace scripting language. Additionally adds code that allows Perl trace scripts to access the 'flag' and 'symbolic' (__print_flags(), __print_symbolic()) field information parsed from the trace format files. Also adds the Perl implementation of the generate_script() trace_scripting_op, which creates a ready-to-run perf trace Perl script based on existing trace data. Scripts generated by this implementation print out all the fields for each event mentioned in perf.data (and will detect and generate the proper scripting code for 'flag' and 'symbolic' fields), and will additionally generate handlers for the special 'trace_unhandled', 'trace_begin' and 'trace_end' handlers. Script authors can simply remove the printing code to implement their own custom event handling. Signed-off-by: Tom Zanussi <tzanussi@gmail.com> Cc: fweisbec@gmail.com Cc: rostedt@goodmis.org Cc: anton@samba.org Cc: hch@infradead.org LKML-Reference: <1259133352-23685-4-git-send-email-tzanussi@gmail.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
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