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2009-08-09perf tools: Fix call-chain cumul hit based sub-total (fractal mode)Frederic Weisbecker
The callchain fractal mode builds each new total hits in a new branch of profiling by using the parent's hits of the current branch plus the hits of the children. This is wrong, the total hits of a branch should be made of the sum of every children hits, we must ignore the parent hits in this scope. This patch also fixes another mistake with the hit counting. Now the rates are correct. Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com> Cc: Frederic Weisbecker <fweisbec@gmail.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Arnaldo Carvalho de Melo <acme@redhat.com> Cc: Mike Galbraith <efault@gmx.de> Cc: Pekka Enberg <penberg@cs.helsinki.fi> Signed-off-by: Ingo Molnar <mingo@elte.hu>
2009-08-09perf top: Update man pageMike Galbraith
perf_counter tools: update perf top manual page to reflect current implementation. Signed-off-by: Mike Galbraith <efault@gmx.de> Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Signed-off-by: Ingo Molnar <mingo@elte.hu>
2009-08-09perf top: Improve interactive key handlingMike Galbraith
Pressing any key which is not currently mapped to functionality, based on startup command line options, displays currently mapped keys, and prompts for input. Pressing any unmapped key at the prompt returns the user to display mode with variables unchanged. eg, pressing ? <SPACE> <ESC> etc displays currently available keys, the value of the variable associated with that key, and prompts. Pressing same again aborts input. Signed-off-by: Mike Galbraith <efault@gmx.de> Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Signed-off-by: Ingo Molnar <mingo@elte.hu>
2009-08-09perf_counter tools: Allow perf top top users to switch between weighted and ↵Mike Galbraith
individual counter display Add [w]eighted hotkey. Pressing [w] toggles between displaying weighted total of all counters, and the counter selected via [E]vent select key. ------------------------------------------------------------------------------ PerfTop: 90395 irqs/sec kernel:16.1% [cache-misses/cache-references/instructions], (all, 4 CPUs) ------------------------------------------------------------------------------ weight samples pcnt RIP kernel function ______ _______ _____ ________________ _______________ 1275408.6 10881 - 5.3% - ffffffff81146f70 : copy_page_c 553683.4 43569 - 21.3% - ffffffff81146f20 : clear_page_c 74075.0 6768 - 3.3% - ffffffff81147190 : copy_user_generic_string 40602.9 7538 - 3.7% - ffffffff81284ba2 : _spin_lock 26882.1 965 - 0.5% - ffffffff8109d280 : file_ra_state_init [w] ------------------------------------------------------------------------------ PerfTop: 91221 irqs/sec kernel:14.5% [10000Hz cache-misses], (all, 4 CPUs) ------------------------------------------------------------------------------ weight samples pcnt RIP kernel function ______ _______ _____ ________________ _______________ 47320.00 - 22.3% - ffffffff81146f20 : clear_page_c 14261.00 - 6.7% - ffffffff810992f5 : __rmqueue 11046.00 - 5.2% - ffffffff81146f70 : copy_page_c 7842.00 - 3.7% - ffffffff81284ba2 : _spin_lock 7234.00 - 3.4% - ffffffff810aa1d6 : unmap_vmas Signed-off-by: Mike Galbraith <efault@gmx.de> Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl> Signed-off-by: Ingo Molnar <mingo@elte.hu>
2009-08-09perf_counter tools: Fix/resurrect perf top annotation in a simple ↵Mike Galbraith
interactive form perf top used to have annotation support, but it has bitrotted and removed. This patch restores that: it allows the user to select any symbol in kernel space for source level annotation on the fly, switch between event counters and alter display variables. When symbol details are being displayed, stopping annotation reverts to normal. known keys: [d] select display delay. [e] select display entries (lines). [E] select annotation event counter. [f] select normal display count filter. [F] select annotation display count filter (percentage). [qQ] quit. [s] select annotation symbol and start annotation. [S] stop annotation, revert to normal display. [z] toggle event count zeroing. Sample: ------------------------------------------------------------------------------ PerfTop: 16719 irqs/sec kernel:78.7% [cache-misses/cache-references/instructions/cycles], (all, 4 CPUs) ------------------------------------------------------------------------------ Showing cache-misses for e1000_clean_rx_irq Events Pcnt (>=3%) 0 0.0% /* adjust length to remove Ethernet CRC */ 0 0.0% if (!(adapter->flags2 & FLAG2_CRC_STRIPPING)) 0 0.0% length -= 4; 436 5.0% f039: 41 f6 84 24 5c 29 00 testb $0x1,0x295c(%r12) 0 0.0% f089: 8b 4d 84 mov -0x7c(%rbp),%ecx 0 0.0% f08c: 48 83 ef 02 sub $0x2,%rdi 0 0.0% f090: 48 83 ee 02 sub $0x2,%rsi 811 9.3% f094: f3 a4 rep movsb %ds:(%rsi),%es:(%rdi) 0 0.0% 0 0.0% while (rx_desc->status & E1000_RXD_STAT_DD) { 0 0.0% f114: 41 f6 47 0c 01 testb $0x1,0xc(%r15) 7226 82.6% f119: 0f 85 24 fe ff ff jne ef43 <e1000_clean_rx_irq+0x84> Available events: 0 cache-misses 1 cache-references 2 instructions 3 cycles Enter details event counter: 2 ------------------------------------------------------------------------------ PerfTop: 15035 irqs/sec kernel:79.0% [cache-misses/cache-references/instructions/cycles], (all, 4 CPUs) ------------------------------------------------------------------------------ Showing instructions for e1000_clean_rx_irq Events Pcnt (>=3%) 0 0.0% int *work_done, int work_to_do) 0 0.0% { 175 0.9% eebf: 55 push %rbp 1898 9.8% eec0: 48 89 e5 mov %rsp,%rbp 0 0.0% 0 0.0% i = rx_ring->next_to_clean; 140 0.7% ef0a: 0f b7 41 1a movzwl 0x1a(%rcx),%eax 670 3.4% ef0e: 89 45 ac mov %eax,-0x54(%rbp) 0 0.0% { 0 0.0% memcpy(skb->data + offset, from, len); 91 0.5% f07b: 49 8b b6 e8 00 00 00 mov 0xe8(%r14),%rsi 1153 5.9% f082: 48 8b b8 e8 00 00 00 mov 0xe8(%rax),%rdi 42 0.2% f089: 8b 4d 84 mov -0x7c(%rbp),%ecx 14 0.1% f08c: 48 83 ef 02 sub $0x2,%rdi 0 0.0% f090: 48 83 ee 02 sub $0x2,%rsi 1618 8.3% f094: f3 a4 rep movsb %ds:(%rsi),%es:(%rdi) 0 0.0% 0 0.0% /* return some buffers to hardware, one at a time is too slow */ 0 0.0% if (cleaned_count >= E1000_RX_BUFFER_WRITE) { 867 4.5% f0e7: 83 7d b0 0f cmpl $0xf,-0x50(%rbp) 0 0.0% 0 0.0% while (rx_desc->status & E1000_RXD_STAT_DD) { 37 0.2% f114: 41 f6 47 0c 01 testb $0x1,0xc(%r15) 4047 20.8% f119: 0f 85 24 fe ff ff jne ef43 <e1000_clean_rx_irq+0x84> Signed-off-by: Mike Galbraith <efault@gmx.de> Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: Paul Mackerras <paulus@samba.org> Signed-off-by: Ingo Molnar <mingo@elte.hu>
2009-08-09perf_counter: Fix/complete ftrace event records samplingFrederic Weisbecker
This patch implements the kernel side support for ftrace event record sampling. A new counter sampling attribute is added: PERF_SAMPLE_TP_RECORD which requests ftrace events record sampling. In this case if a PERF_TYPE_TRACEPOINT counter is active and a tracepoint fires, we emit the tracepoint binary record to the perfcounter event buffer, as a sample. Result, after setting PERF_SAMPLE_TP_RECORD attribute from perf record: perf record -f -F 1 -a -e workqueue:workqueue_execution perf report -D 0x21e18 [0x48]: event: 9 . . ... raw event: size 72 bytes . 0000: 09 00 00 00 01 00 48 00 d0 c7 00 81 ff ff ff ff ......H........ . 0010: 0a 00 00 00 0a 00 00 00 21 00 00 00 00 00 00 00 ........!...... . 0020: 2b 00 01 02 0a 00 00 00 0a 00 00 00 65 76 65 6e +...........eve . 0030: 74 73 2f 31 00 00 00 00 00 00 00 00 0a 00 00 00 ts/1........... . 0040: e0 b1 31 81 ff ff ff ff ....... . 0x21e18 [0x48]: PERF_EVENT_SAMPLE (IP, 1): 10: 0xffffffff8100c7d0 period: 33 The raw ftrace binary record starts at offset 0020. Translation: struct trace_entry { type = 0x2b = 43; flags = 1; preempt_count = 2; pid = 0xa = 10; tgid = 0xa = 10; } thread_comm = "events/1" thread_pid = 0xa = 10; func = 0xffffffff8131b1e0 = flush_to_ldisc() What will come next? - Userspace support ('perf trace'), 'flight data recorder' mode for perf trace, etc. - The unconditional copy from the profiling callback brings some costs however if someone wants no such sampling to occur, and needs to be fixed in the future. For that we need to have an instant access to the perf counter attribute. This is a matter of a flag to add in the struct ftrace_event. - Take care of the events recursivity! Don't ever try to record a lock event for example, it seems some locking is used in the profiling fast path and lead to a tracing recursivity. That will be fixed using raw spinlock or recursivity protection. - [...] - Profit! :-) Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com> Cc: Li Zefan <lizf@cn.fujitsu.com> Cc: Tom Zanussi <tzanussi@gmail.com> Cc: Arnaldo Carvalho de Melo <acme@redhat.com> Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: Mike Galbraith <efault@gmx.de> Cc: Steven Rostedt <rostedt@goodmis.org> Cc: Paul Mackerras <paulus@samba.org> Cc: Pekka Enberg <penberg@cs.helsinki.fi> Cc: Gabriel Munteanu <eduard.munteanu@linux360.ro> Cc: Lai Jiangshan <laijs@cn.fujitsu.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
2009-08-06perf: Auto-detect libelfPeter Zijlstra
Adds autodetection for libelf as well, and simplifies the libbfd code. Furthermore, fail make with an error when libelf is not found and warn about the lack of libbfd. Also provide an option to build a 32bit version even though you might be running a 64bit kernel. Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl> Signed-off-by: Ingo Molnar <mingo@elte.hu>
2009-08-06perf symbol: Fix symbol parsing in certain cases: use the build-id as a symlinkArnaldo Carvalho de Melo
In some cases distros have binaries and debuginfo in weird places: [root@doppio tuna]# ls -la /usr/lib64/{xulrunner-1.9.1/xulrunner-stub,firefox-3.5.2/firefox} -rwxr-xr-x 1 root root 90024 2009-08-03 19:45 /usr/lib64/firefox-3.5.2/firefox -rwxr-xr-x 1 root root 90024 2009-08-03 18:23 /usr/lib64/xulrunner-1.9.1/xulrunner-stub [root@doppio tuna]# sha1sum /usr/lib64/{xulrunner-1.9.1/xulrunner-stub,firefox-3.5.2/firefox} 19a858077d263d5de22c9c5da250d3e4396ae739 /usr/lib64/xulrunner-1.9.1/xulrunner-stub 19a858077d263d5de22c9c5da250d3e4396ae739 /usr/lib64/firefox-3.5.2/firefox [root@doppio tuna]# rpm -qf /usr/lib64/{xulrunner-1.9.1/xulrunner-stub,firefox-3.5.2/firefox} xulrunner-1.9.1.2-1.fc11.x86_64 firefox-3.5.2-2.fc11.x86_64 [root@doppio tuna]# ls -la /usr/lib/debug/{usr/lib64/xulrunner-1.9.1/xulrunner-stub,usr/lib64/firefox-3.5.2/firefox}.debug ls: cannot access /usr/lib/debug/usr/lib64/firefox-3.5.2/firefox.debug: No such file or directory -rwxr-xr-x 1 root root 403608 2009-08-03 18:22 /usr/lib/debug/usr/lib64/xulrunner-1.9.1/xulrunner-stub.debug Seemingly we don't have a .symtab when we actually can find it if we use the .note.gnu.build-id ELF section put in place by some distros. Use it and find the symbols we need. Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com> Acked-by: Peter Zijlstra <peterz@infradead.org> LKML-Reference: <new-submission> Signed-off-by: Ingo Molnar <mingo@elte.hu>
2009-08-05perf report: Add missing command line options to man pageArnaldo Carvalho de Melo
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com> Cc: Peter Zijlstra <peterz@infradead.org> LKML-Reference: <20090805130453.GC10688@ghostprotocols.net> Signed-off-by: Ingo Molnar <mingo@elte.hu>
2009-08-05perf: Auto-detect libbfdPeter Zijlstra
Since the C++ demangling isn't needed for everybody and bfd/iberty aren't widely/easily available on all machines, make it optional. It also allows you to forcefully disable demangling by using NO_DEMANGLE=1 and otherwise tries to detect libbfd/libiberty combinations that result in a compiling demangler. Reported-by: Jens Axboe <jens.axboe@oracle.com> Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: Arnaldo Carvalho de Melo <acme@redhat.com> Cc: Kyle McMartin <kyle@mcmartin.ca> LKML-Reference: <20090801082048.GX12579@kernel.dk> Signed-off-by: Ingo Molnar <mingo@elte.hu>
2009-08-05perf report: Make --sort comm,dso,symbol the defaultPekka Enberg
If you're doing performance testing, you're interested in the symbols anyway so lets make "--sort comm,dso,symbol" the default sort option. Signed-off-by: Pekka Enberg <penberg@cs.helsinki.fi> Acked-by: Peter Zijlstra <peterz@infradead.org> Cc: acme@redhat.com LKML-Reference: <1249467921-10450-1-git-send-email-penberg@cs.helsinki.fi> Signed-off-by: Ingo Molnar <mingo@elte.hu>
2009-08-04perf: Fix read buffer overflowRoel Kluin
Check whether index is within bounds before testing the element. Signed-off-by: Roel Kluin <roel.kluin@gmail.com> Cc: a.p.zijlstra@chello.nl Cc: Andrew Morton <akpm@linux-foundation.org> LKML-Reference: <4A757BCF.40101@gmail.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
2009-08-02perf top: Add mwait_idle_with_hints to skip_symbols[]Arnaldo Carvalho de Melo
We skip the display of idle routine related symbols because they are typically rather erratic and confusing: they depend on the IRQ rate or sometimes they dominate the profile if they are polling based. Add mwait_idle_with_hints too, this is one of the idle routines on x86. Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
2009-08-02perf tools: Fix faulty checkStoyan Gaydarov
This patch fixes a spelling error that has resulted from copy and pasting. The location of the error was found using a semantic patch but the semantic patch was not trying to find these errors. After looking things over it seemed logical that this change was needed. Please review it and then include the patch if it is in fact the correct change. Signed-off-by: Stoyan Gaydarov <sgayda2@uiuc.edu> Signed-off-by: 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: <1248949529-20891-1-git-send-email-sgayda2@uiuc.edu> Signed-off-by: Ingo Molnar <mingo@elte.hu>
2009-08-02perf report: Update for the new FORK/EXIT eventsPeter Zijlstra
Since FORK is now also issued for threads, detect those by comparing the parent and child PID. Teach it about EXIT events and ignore them. Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: Paul Mackerras <paulus@samba.org> Signed-off-by: Ingo Molnar <mingo@elte.hu>
2009-08-01perf_counter tools: Fix link errors with older toolchainsIngo Molnar
On older distros (F8 for example) the perf build could fail with such missing symbols: LINK perf /usr/lib/gcc/x86_64-redhat-linux/4.3.2/../../../../lib64/libbfd.a(bfd.o): In function `bfd_demangle': (.text+0x2b3): undefined reference to `cplus_demangle' /usr/lib/gcc/x86_64-redhat-linux/4.3.2/../../../../lib64/libbfd.a(bfd.o): In function `bfd_demangle': Link in -liberty too. 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>
2009-07-22Merge branch 'perf-counters-for-linus' of ↵Linus Torvalds
git://git.kernel.org/pub/scm/linux/kernel/git/peterz/linux-2.6-perf * 'perf-counters-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/peterz/linux-2.6-perf: (31 commits) perf_counter tools: Give perf top inherit option perf_counter tools: Fix vmlinux symbol generation breakage perf_counter: Detect debugfs location perf_counter: Add tracepoint support to perf list, perf stat perf symbol: C++ demangling perf: avoid structure size confusion by using a fixed size perf_counter: Fix throttle/unthrottle event logging perf_counter: Improve perf stat and perf record option parsing perf_counter: PERF_SAMPLE_ID and inherited counters perf_counter: Plug more stack leaks perf: Fix stack data leak perf_counter: Remove unused variables perf_counter: Make call graph option consistent perf_counter: Add perf record option to log addresses perf_counter: Log vfork as a fork event perf_counter: Synthesize VDSO mmap event perf_counter: Make sure we dont leak kernel memory to userspace perf_counter tools: Fix index boundary check perf_counter: Fix the tracepoint channel to perfcounters perf_counter, x86: Extend perf_counter Pentium M support ...
2009-07-22perf_counter tools: Give perf top inherit optionMike Galbraith
Currently, perf top -p only tracks the pid provided, which isn't very useful for watching forky loads, so give it an inherit option. Signed-off-by: Mike Galbraith <efault@gmx.de> Cc: Ingo Molnar <mingo@elte.hu> Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl> LKML-Reference: <1248165036.9795.10.camel@marge.simson.net>
2009-07-22perf_counter tools: Fix vmlinux symbol generation breakageMike Galbraith
vmlinux meets the criteria for symbol adjustment, which breaks vmlinux generated symbols. Fix this by exempting vmlinux. This is a bit fragile in that someone could change the kernel dso's name, but currently that name is also hardwired. Signed-off-by: Mike Galbraith <efault@gmx.de> Cc: Ingo Molnar <mingo@elte.hu> Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl> LKML-Reference: <1248091298.18702.18.camel@marge.simson.net>
2009-07-22perf_counter: Detect debugfs locationJason Baron
If "/sys/kernel/debug" is not a debugfs mount point, search for the debugfs filesystem in /proc/mounts, but also allows the user to specify '--debugfs-dir=blah' or set the environment variable: 'PERF_DEBUGFS_DIR' Signed-off-by: Jason Baron <jbaron@redhat.com> [ also made it probe "/debug" by default ] Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl> LKML-Reference: <20090721181629.GA3094@redhat.com>
2009-07-22perf_counter: Add tracepoint support to perf list, perf statJason Baron
Add support to 'perf list' and 'perf stat' for kernel tracepoints. The implementation creates a 'for_each_subsystem' and 'for_each_event' for easy iteration over the tracepoints. Signed-off-by: Jason Baron <jbaron@redhat.com> Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl> LKML-Reference: <426129bf9fcc8ee63bb094cf736e7316a7dcd77a.1248190728.git.jbaron@redhat.com>
2009-07-22perf symbol: C++ demanglingArnaldo Carvalho de Melo
[acme@doppio ~]$ perf report -s comm,dso,symbol -C firefox -d /usr/lib64/xulrunner-1.9.1/libxul.so | grep :: | head 2.21% [.] nsDeque::Push(void*) 1.78% [.] GraphWalker::DoWalk(nsDeque&) 1.30% [.] GCGraphBuilder::AddNode(void*, nsCycleCollectionParticipant*) 1.27% [.] XPCWrappedNative::CallMethod(XPCCallContext&, XPCWrappedNative::CallMode) 1.18% [.] imgContainer::DrawFrameTo(gfxIImageFrame*, gfxIImageFrame*, nsRect&) 1.13% [.] nsDeque::PopFront() 1.11% [.] nsGlobalWindow::RunTimeout(nsTimeout*) 0.97% [.] nsXPConnect::Traverse(void*, nsCycleCollectionTraversalCallback&) 0.95% [.] nsJSEventListener::cycleCollection::Traverse(void*, nsCycleCollectionTraversalCallback&) 0.95% [.] nsCOMPtr_base::~nsCOMPtr_base() [acme@doppio ~]$ Cc: Pekka Enberg <penberg@cs.helsinki.fi> Cc: Vegard Nossum <vegard.nossum@gmail.com> Cc: Paul Mackerras <paulus@samba.org> Cc: Frédéric Weisbecker <fweisbec@gmail.com> Suggested-by: Clark Williams <williams@redhat.com> Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com> Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl> LKML-Reference: <20090720171412.GB10410@ghostprotocols.net>
2009-07-22perf: avoid structure size confusion by using a fixed sizeArjan van de Ven
for some reason, this structure gets compiled as 36 bytes in some files (the ones that alloacte it) but 40 bytes in others (the ones that use it). The cause is an off_t type that gets a different size in different compilation units for some yet-to-be-explained reason. But the effect is disasterous; the size/offset members of the struct are at different offsets, and result in mostly complete garbage. The parser in perf is so robust that this all gets hidden, and after skipping an certain amount of samples, it recovers.... so this bug is not normally noticed. .... except when you want every sample to be exact. Fix this by just using an explicitly sized type. Signed-off-by: Arjan van de Ven <arjan@linux.intel.com> Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl> LKML-Reference: <4A655917.9080504@linux.intel.com>
2009-07-22perf_counter: Improve perf stat and perf record option parsingAnton Blanchard
perf stat and perf record currently look for all options on the command line. This can lead to some confusion: # perf stat ls -l Error: unknown switch `l' While we can work around this by adding '--' before the command, the git option parsing code can stop at the first non option: # perf stat ls -l Performance counter stats for 'ls -l': .... Signed-off-by: Anton Blanchard <anton@samba.org> Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl> LKML-Reference: <20090722130412.GD9029@kryten>
2009-07-22perf_counter: PERF_SAMPLE_ID and inherited countersPeter Zijlstra
Anton noted that for inherited counters the counter-id as provided by PERF_SAMPLE_ID isn't mappable to the id found through PERF_RECORD_ID because each inherited counter gets its own id. His suggestion was to always return the parent counter id, since that is the primary counter id as exposed. However, these inherited counters have a unique identifier so that events like PERF_EVENT_PERIOD and PERF_EVENT_THROTTLE can be specific about which counter gets modified, which is important when trying to normalize the sample streams. This patch removes PERF_EVENT_PERIOD in favour of PERF_SAMPLE_PERIOD, which is more useful anyway, since changing periods became a lot more common than initially thought -- rendering PERF_EVENT_PERIOD the less useful solution (also, PERF_SAMPLE_PERIOD reports the more accurate value, since it reports the value used to trigger the overflow, whereas PERF_EVENT_PERIOD simply reports the requested period changed, which might only take effect on the next cycle). This still leaves us PERF_EVENT_THROTTLE to consider, but since that _should_ be a rare occurrence, and linking it to a primary id is the most useful bit to diagnose the problem, we introduce a PERF_SAMPLE_STREAM_ID, for those few cases where the full reconstruction is important. [Does change the ABI a little, but I see no other way out] Suggested-by: Anton Blanchard <anton@samba.org> Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl> LKML-Reference: <1248095846.15751.8781.camel@twins>
2009-07-22Merge commit 'tip/perfcounters/core' into perf-counters-for-linusPeter Zijlstra
2009-07-18perf_counter: Make call graph option consistentAnton Blanchard
perf record uses -g for logging call graph data but perf report uses -c to print call graph data. Be consistent and use -g everywhere for call graph data. Also update the help text to reflect the current default - fractal,0.5 Signed-off-by: Anton Blanchard <anton@samba.org> Acked-by: Frederic Weisbecker <fweisbec@gmail.com> Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl> LKML-Reference: <20090716104817.803604373@samba.org> Signed-off-by: Ingo Molnar <mingo@elte.hu>
2009-07-18perf_counter: Add perf record option to log addressesAnton Blanchard
Add the -d or --data option to log event addresses (eg page faults). Signed-off-by: Anton Blanchard <anton@samba.org> Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl> LKML-Reference: <20090716104817.697698033@samba.org> Signed-off-by: Ingo Molnar <mingo@elte.hu>
2009-07-18perf_counter: Synthesize VDSO mmap eventAnton Blanchard
perf record synthesizes mmap events for the running process. Right now it just catches file mappings, but we can check for the vdso symbol and add that too. Signed-off-by: Anton Blanchard <anton@samba.org> Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl> LKML-Reference: <20090716104817.517264409@samba.org> Signed-off-by: Ingo Molnar <mingo@elte.hu>
2009-07-13perf_counter tools: Fix index boundary checkRoel Kluin
Keep index within event_type_descriptors[] Signed-off-by: Roel Kluin <roel.kluin@gmail.com> Cc: Andrew Morton <akpm@linux-foundation.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: <4A5A7F0B.4070106@gmail.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
2009-07-11perf report: Introduce -n/--show-nr-samplesArnaldo Carvalho de Melo
[acme@doppio pahole]$ perf report -ns comm,dso,symbol -d /lib64/libc-2.10.1.so -C pahole | head -17 21.94% 32101 [.] _int_malloc 20.10% 29402 [.] __GI_strcmp 16.77% 24533 [.] __tsearch 12.61% 18450 [.] malloc_consolidate 6.42% 9394 [.] _int_free 6.28% 9191 [.] __tfind 4.56% 6678 [.] __GI___libc_free 4.46% 6520 [.] _IO_vfprintf_internal 2.59% 3786 [.] __malloc 1.17% 1716 [.] __GI_memcpy [acme@doppio pahole]$ Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com> LKML-Reference: <1247325517-12272-5-git-send-email-acme@redhat.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
2009-07-11perf_counter tools: PLT info is stripped in -debuginfo packagesArnaldo Carvalho de Melo
So we need to get the richer .symtab from the debuginfo packages but the PLT info from the original DSO where we have just the leaner .dynsym symtab. Example: | [acme@doppio pahole]$ perf report --sort comm,dso,symbol > before | [acme@doppio pahole]$ perf report --sort comm,dso,symbol > after | [acme@doppio pahole]$ diff -U1 before after | --- before 2009-07-11 11:04:22.688595741 -0300 | +++ after 2009-07-11 11:04:33.380595676 -0300 | @@ -80,3 +80,2 @@ | 0.07% pahole ./build/pahole [.] pahole_stealer | - 0.06% pahole /usr/lib64/libdw-0.141.so [.] 0x00000000007140 | 0.06% pahole /usr/lib64/libdw-0.141.so [.] __libdw_getabbrev | @@ -91,2 +90,3 @@ | 0.06% pahole [kernel] [k] free_hot_cold_page | + 0.06% pahole /usr/lib64/libdw-0.141.so [.] tfind@plt | 0.05% pahole ./build/libdwarves.so.1.0.0 [.] ftype__add_parameter | @@ -242,2 +242,3 @@ | 0.01% pahole [kernel] [k] account_group_user_time | + 0.01% pahole /usr/lib64/libdw-0.141.so [.] strlen@plt | 0.01% pahole ./build/pahole [.] strcmp@plt | [acme@doppio pahole]$ Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com> LKML-Reference: <1247325517-12272-4-git-send-email-acme@redhat.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
2009-07-11perf report: Make the output more compactArnaldo Carvalho de Melo
When we filter by column content we may end up with a column that has the same value for all the lines. So remove that column and tell its unique value on the top, as a comment. Example: [acme@doppio pahole]$ perf report --sort comm,dso,symbol -d ./build/libdwarves.so.1.0.0 -C pahole | head -15 # dso: ./build/libdwarves.so.1.0.0 # comm: pahole # Samples: 58409 # # Overhead Symbol # ........ ...... # 20.93% [.] tag__recode_dwarf_type 14.94% [.] namespace__recode_dwarf_types 10.38% [.] cu__table_add_tag 6.69% [.] __die__process_tag 5.05% [.] die__process_function 4.70% [.] list__for_all_tags 3.68% [.] tag__init 3.48% [.] die__create_new_parameter [acme@doppio pahole]$ Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com> LKML-Reference: <1247325517-12272-3-git-send-email-acme@redhat.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
2009-07-11strlist: Introduce strlist__entry and strlist__nr_entries methodsArnaldo Carvalho de Melo
The strlist__entry method allows accessing strlists like an array, will be used in the 'perf report' to access the first entry. We now keep the nr_entries so that we can check if we have just one entry, will be used in 'perf report' to improve the output by showing just at the top when we have just, say, one DSO. While at it use nr_entries to optimize strlist__is_empty by not using the far more costly rb_first based implementation. Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com> LKML-Reference: <1247325517-12272-2-git-send-email-acme@redhat.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
2009-07-11perf report: Tidy up reporting of symbols not foundArnaldo Carvalho de Melo
Always printing the level info about if it is in the kernel, hypervisor or userspace as that is in the hist_entry. Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com> LKML-Reference: <1247325517-12272-1-git-send-email-acme@redhat.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
2009-07-11perf report: Adjust column width to the values sampledArnaldo Carvalho de Melo
Auto-adjust column width of perf report output to the longest occuring string length. Example: [acme@doppio pahole]$ perf report --sort comm,dso,symbol | head -13 12.79% pahole /usr/lib64/libdw-0.141.so [.] __libdw_find_attr 8.90% pahole /lib64/libc-2.10.1.so [.] _int_malloc 8.68% pahole /usr/lib64/libdw-0.141.so [.] __libdw_form_val_len 8.15% pahole /lib64/libc-2.10.1.so [.] __GI_strcmp 6.80% pahole /lib64/libc-2.10.1.so [.] __tsearch 5.54% pahole ./build/libdwarves.so.1.0.0 [.] tag__recode_dwarf_type [acme@doppio pahole]$ [acme@doppio pahole]$ perf report --sort comm,dso,symbol -d /lib64/libc-2.10.1.so | head -10 21.92% pahole /lib64/libc-2.10.1.so [.] _int_malloc 20.08% pahole /lib64/libc-2.10.1.so [.] __GI_strcmp 16.75% pahole /lib64/libc-2.10.1.so [.] __tsearch [acme@doppio pahole]$ Also add these extra options to control the new behaviour: -w, --field-width Force each column width to the provided list, for large terminal readability. -t, --field-separator: Use a special separator character and don't pad with spaces, replacing all occurances of this separator in symbol names (and other output) with a '.' character, that thus it's the only non valid separator. Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.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: <20090711014728.GH3452@ghostprotocols.net> Signed-off-by: Ingo Molnar <mingo@elte.hu>
2009-07-10Merge branch 'perfcounters-fixes-for-linus' of ↵Linus Torvalds
git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip * 'perfcounters-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip: (50 commits) perf report: Add "Fractal" mode output - support callchains with relative overhead rate perf_counter tools: callchains: Manage the cumul hits on the fly perf report: Change default callchain parameters perf report: Use a modifiable string for default callchain options perf report: Warn on callchain output request from non-callchain file x86: atomic64: Inline atomic64_read() again x86: atomic64: Clean up atomic64_sub_and_test() and atomic64_add_negative() x86: atomic64: Improve atomic64_xchg() x86: atomic64: Export APIs to modules x86: atomic64: Improve atomic64_read() x86: atomic64: Code atomic(64)_read and atomic(64)_set in C not CPP x86: atomic64: Fix unclean type use in atomic64_xchg() x86: atomic64: Make atomic_read() type-safe x86: atomic64: Reduce size of functions x86: atomic64: Improve atomic64_add_return() x86: atomic64: Improve cmpxchg8b() x86: atomic64: Improve atomic64_read() x86: atomic64: Move the 32-bit atomic64_t implementation to a .c file x86: atomic64: The atomic64_t data type should be 8 bytes aligned on 32-bit too perf report: Annotate variable initialization ...
2009-07-10perf_counter: Add P6 PMU supportVince Weaver
Add basic P6 PMU support. The P6 uses the EVNTSEL0 EN bit to enable/disable both its counters. We use this for the global enable/disable, and clear all config bits (except EN) to disable individual counters. Actual ia32 hardware doesn't support lfence, so use a locked op without side-effect to implement a full barrier. perf stat and perf record seem to function correctly. [a.p.zijlstra@chello.nl: cleanups and complete the enable/disable code] Signed-off-by: Vince Weaver <vince@deater.net> Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl> LKML-Reference: <Pine.LNX.4.64.0907081718450.2715@pianoman.cluster.toy> Signed-off-by: Ingo Molnar <mingo@elte.hu>
2009-07-10perf_counter tools: Rename cache events to remove $Anton Blanchard
The cache events contain '$' which will hit shell variable expansion. To avoid confusion change this to 'cache', ie L1-d$-loads becomes L1-dcache-loads. Signed-off-by: Anton Blanchard <anton@samba.org> Cc: Roland Dreier <rdreier@cisco.com> Cc: Jaswinder Singh Rajput <jaswinder@kernel.org> Cc: Peter Zijlstra <peterz@infradead.org> LKML-Reference: <20090706120131.GB4391@kryten> Signed-off-by: Ingo Molnar <mingo@elte.hu>
2009-07-05perf report: Add "Fractal" mode output - support callchains with relative ↵Frederic Weisbecker
overhead rate The current callchain displays the overhead rates as absolute: relative to the total overhead. This patch provides relative overhead percentage, in which each branch of the callchain tree is a independant instrumentated object. This provides a 'fractal' view of the call-chain profile: each sub-graph looks like a profile in itself - relative to its parent. You can produce such output by using the "fractal" mode that you can abbreviate via f, fr, fra, frac, etc... ./perf report -s sym -c fractal Example: 8.46% [k] copy_user_generic_string | |--52.01%-- generic_file_aio_read | do_sync_read | vfs_read | | | |--97.20%-- sys_pread64 | | system_call_fastpath | | pread64 | | | --2.81%-- sys_read | system_call_fastpath | __read | |--39.85%-- generic_file_buffered_write | __generic_file_aio_write_nolock | generic_file_aio_write | do_sync_write | reiserfs_file_write | vfs_write | | | |--97.05%-- sys_pwrite64 | | system_call_fastpath | | __pwrite64 | | | --2.95%-- sys_write | system_call_fastpath | __write_nocancel [...] Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com> Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: Mike Galbraith <efault@gmx.de> Cc: Paul Mackerras <paulus@samba.org> Cc: Anton Blanchard <anton@samba.org> Cc: Jens Axboe <jens.axboe@oracle.com> Cc: Arnaldo Carvalho de Melo <acme@redhat.com> LKML-Reference: <1246772361-9960-5-git-send-email-fweisbec@gmail.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
2009-07-05perf_counter tools: callchains: Manage the cumul hits on the flyFrederic Weisbecker
The cumul hits are the number of hits of every childs of a node plus the hits of the current nodes, required for percentage computing of a branch. Theses numbers are calculated during the sorting of the branches of the callchain tree using a depth first postfix traversal, so that cumulative hits are propagated in the right order. But if we plan to implement percentages relative to the parent and not absolute percentages (relative to the whole overhead), we need to know the cumulative hits of the parent before computing the children because the relative minimum acceptable number of entries (ie: minimum rate against the cumulative hits from the parent) is the basis to filter the children against a given rate. Then we need to handle the cumul hits on the fly to prepare the implementation of relative overhead rates. Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com> Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: Mike Galbraith <efault@gmx.de> Cc: Paul Mackerras <paulus@samba.org> Cc: Anton Blanchard <anton@samba.org> Cc: Jens Axboe <jens.axboe@oracle.com> Cc: Arnaldo Carvalho de Melo <acme@redhat.com> LKML-Reference: <1246772361-9960-4-git-send-email-fweisbec@gmail.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
2009-07-05perf report: Change default callchain parametersFrederic Weisbecker
The default callchain parameters are set to use the flat mode and never filter any overhead threshold of backtrace. But flat mode is boring compared to graph mode. Also the number of callchains may be very high if none is filtered. Let's change this to set the graph view and a minimum overhead of 0.5% as default parameters. Reported-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com> Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: Mike Galbraith <efault@gmx.de> Cc: Paul Mackerras <paulus@samba.org> Cc: Anton Blanchard <anton@samba.org> Cc: Jens Axboe <jens.axboe@oracle.com> Cc: Arnaldo Carvalho de Melo <acme@redhat.com> LKML-Reference: <1246772361-9960-3-git-send-email-fweisbec@gmail.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
2009-07-05perf report: Use a modifiable string for default callchain optionsFrederic Weisbecker
If the user doesn't provide options to tune his callchain output (ie: if he uses -c without arguments) then the default value passed in the OPT_CALLBACK_DEFAULT() macro is used. But it's parsed later by strtok() which will replace comma separators to a zero. This may segfault as we are using a read-only string. Use a modifiable one instead, and also fix the "100%" default minimum threshold value by turning it into a 0 (output every callchains) as it was intended in the origin. Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com> Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: Mike Galbraith <efault@gmx.de> Cc: Paul Mackerras <paulus@samba.org> Cc: Anton Blanchard <anton@samba.org> Cc: Jens Axboe <jens.axboe@oracle.com> Cc: Arnaldo Carvalho de Melo <acme@redhat.com> LKML-Reference: <1246772361-9960-2-git-send-email-fweisbec@gmail.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
2009-07-05perf report: Warn on callchain output request from non-callchain fileFrederic Weisbecker
perf report segfaults while trying to handle callchains from a non callchain data file. Instead of a segfault, print a useful message to the user. Reported-by: Jens Axboe <jens.axboe@oracle.com> Reported-by: Arnaldo Carvalho de Melo <acme@redhat.com> Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com> Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: Mike Galbraith <efault@gmx.de> Cc: Paul Mackerras <paulus@samba.org> Cc: Anton Blanchard <anton@samba.org> Cc: Jens Axboe <jens.axboe@oracle.com> Cc: Arnaldo Carvalho de Melo <acme@redhat.com> LKML-Reference: <1246772361-9960-1-git-send-email-fweisbec@gmail.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
2009-07-04Merge branch 'for-linus' of ↵Linus Torvalds
git://git.kernel.org/pub/scm/linux/kernel/git/kyle/parisc-2.6 * 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/kyle/parisc-2.6: (27 commits) parisc: use generic atomic64 on 32-bit parisc: superio: fix build breakage parisc: Fix PCI resource allocation on non-PAT SBA machines parisc: perf: wire up sys_perf_counter_open parisc: add task_pt_regs macro parisc: wire sys_perf_counter_open to sys_ni_syscall parisc: inventory.c, fix bloated stack frame parisc: processor.c, fix bloated stack frame parisc: fix compile warning in mm/init.c parisc: remove dead code from sys_parisc32.c parisc: wire up rt_tgsigqueueinfo parisc: ensure broadcast tlb purge runs single threaded parisc: fix "delay!" timer handling parisc: fix mismatched parenthesis in memcpy.c parisc: Fix gcc 4.4 warning in lba_pci.c parisc: add parameter to read_cr16() parisc: decode_exc.c should include kernel.h parisc: remove obsolete hw_interrupt_type parisc: fix irq compile bugs in arch/parisc/kernel/irq.c parisc: advertise PCI devs after "assign_resources" ... Manually fixed up trivial conflicts in tools/perf/perf.h due to addition of SH vs HPPA perf-counter support.
2009-07-03perf report: Annotate variable initializationIngo Molnar
Certain versions of GCC dont see the initialization that is done here: builtin-report.c: In function ‘__cmd_report’: builtin-report.c:1038: warning: ‘syms’ may be used uninitialized in this function So annotate it with a NULL initialization. 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>
2009-07-03perf_counter tools: Adjust symbols in ET_EXEC files tooArnaldo Carvalho de Melo
Ingo Molnar wrote: > i just bisected a 'perf report' bug that would cause us to not > resolve all user-space symbols in a 'git gc' run to: > > f5812a7a336fb952d819e4427b9a2dce02368e82 is first bad commit > commit f5812a7a336fb952d819e4427b9a2dce02368e82 > Author: Arnaldo Carvalho de Melo <acme@redhat.com> > Date: Tue Jun 30 11:43:17 2009 -0300 > > perf_counter tools: Adjust only prelinked symbol's addresses Rename ->prelinked to ->adjust_symbols and making what was done only for prelinked libraries also to ET_EXEC binaries, such as /usr/bin/git: [acme@doppio pahole]$ readelf -h /usr/bin/git | grep Type Type: EXEC (Executable file) [acme@doppio pahole]$ And after installing the 'git-debuginfo' package, I get correct results: [acme@doppio linux-2.6-tip]$ perf report --sort comm,dso,symbol -d /usr/bin/git | head -20 # # (1139614 samples) # # Overhead Command Shared Object Symbol # ........ ................ ......................... ...... # 34.98% git /usr/bin/git [.] send_sideband 33.39% git /usr/bin/git [.] enter_repo 6.81% git /usr/bin/git [.] diff_opt_parse 4.95% git /usr/bin/git [.] is_repository_shallow 3.24% git /usr/bin/git [.] odb_mkstemp 1.39% git /usr/bin/git [.] output 1.34% git /usr/bin/git [.] xmmap 1.25% git /usr/bin/git [.] receive_pack_config 1.16% git /usr/bin/git [.] git_pathdup 0.90% git /usr/bin/git [.] read_object_with_reference 0.86% git /usr/bin/git [.] show_patch_diff 0.85% git /usr/bin/git 0x00000000095e2e 0.69% git /usr/bin/git [.] display [acme@doppio linux-2.6-tip]$ I'll check what are the last cases where we can't resolve symbols, like this 0x00000000095e2e later. And I guess this will fix the problems Mike were seeing too: [acme@doppio linux-2.6-tip]$ readelf -h ../build/perf/vmlinux | grep Type Type: EXEC (Executable file) [acme@doppio linux-2.6-tip]$ Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: Mike Galbraith <efault@gmx.de> Cc: Paul Mackerras <paulus@samba.org> Cc: Frederic Weisbecker <fweisbec@gmail.com> LKML-Reference: <new-submission> Signed-off-by: Ingo Molnar <mingo@elte.hu>
2009-07-03parisc: perf: wire up sys_perf_counter_openKyle McMartin
Signed-off-by: Kyle McMartin <kyle@mcmartin.ca>
2009-07-02perf_counter tools: Display percents of hits in callchain with overhead colorsFrederic Weisbecker
This adds the use of colors to signal at a glance the important overhead thresholds in callchains hit rates. Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com> Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: Mike Galbraith <efault@gmx.de> Cc: Paul Mackerras <paulus@samba.org> Cc: Anton Blanchard <anton@samba.org> Cc: Arnaldo Carvalho de Melo <acme@redhat.com> LKML-Reference: <1246558475-10624-3-git-send-email-fweisbec@gmail.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
2009-07-02perf_counter tools: Provide helper to print percents colorFrederic Weisbecker
Among perf annotate, perf report and perf top, we can find the common colored printing of percents according to the following rules: High overhead = > 5%, colored in red Mid overhead = > 0.5%, colored in green Low overhead = < 0.5%, default color Factorize these multiple checks in a single function named percent_color_fprintf() and also provide a get_percent_color() for sites which print percentages and other things at the same time. Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com> Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: Mike Galbraith <efault@gmx.de> Cc: Paul Mackerras <paulus@samba.org> Cc: Anton Blanchard <anton@samba.org> Cc: Arnaldo Carvalho de Melo <acme@redhat.com> LKML-Reference: <1246558475-10624-2-git-send-email-fweisbec@gmail.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
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