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2015-08-31perf record: Add ability to name registers to recordStephane Eranian
This patch modifies the -I/--int-regs option to enablepassing the name of the registers to sample on interrupt. Registers can be specified by their symbolic names. For instance on x86, --intr-regs=ax,si. The motivation is to reduce the size of the perf.data file and the overhead of sampling by only collecting the registers useful to a specific analysis. For instance, for value profiling, sampling only the registers used to passed arguements to functions. With no parameter, the --intr-regs still records all possible registers based on the architecture. To name registers, it is necessary to use the long form of the option, i.e., --intr-regs: $ perf record --intr-regs=si,di,r8,r9 ..... To record any possible registers: $ perf record -I ..... $ perf report --intr-regs ... To display the register, one can use perf report -D To list the available registers: $ perf record --intr-regs=\? available registers: AX BX CX DX SI DI BP SP IP FLAGS CS SS R8 R9 R10 R11 R12 R13 R14 R15 Signed-off-by: Stephane Eranian <eranian@google.com> Tested-by: Arnaldo Carvalho de Melo <acme@redhat.com> Cc: Adrian Hunter <adrian.hunter@intel.com> Cc: Andi Kleen <ak@linux.intel.com> Cc: David Ahern <dsahern@gmail.com> Cc: Jiri Olsa <jolsa@redhat.com> Cc: Kan Liang <kan.liang@intel.com> Cc: Namhyung Kim <namhyung@kernel.org> Cc: Peter Zijlstra <peterz@infradead.org> Link: http://lkml.kernel.org/r/1441039273-16260-4-git-send-email-eranian@google.com Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
2015-07-29perf tools: Introduce callgraph_set for callgraph optionKan Liang
Introduce callgraph_set to indicate whether the callgraph option was set by user. Signed-off-by: Kan Liang <kan.liang@intel.com> Cc: Andi Kleen <ak@linux.intel.com> Cc: Jiri Olsa <jolsa@kernel.org> Cc: Namhyung Kim <namhyung@kernel.org> Link: http://lkml.kernel.org/r/1438162936-59698-4-git-send-email-kan.liang@intel.com Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
2015-07-23perf record: Add option --switch-events to select PERF_RECORD_SWITCH eventsAdrian Hunter
Add an option to select PERF_RECORD_SWITCH events. Signed-off-by: Adrian Hunter <adrian.hunter@intel.com> Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org> Tested-by: Arnaldo Carvalho de Melo <acme@redhat.com> Tested-by: Jiri Olsa <jolsa@redhat.com> Cc: Andi Kleen <ak@linux.intel.com> Cc: Mathieu Poirier <mathieu.poirier@linaro.org> Cc: Pawel Moll <pawel.moll@arm.com> Cc: Stephane Eranian <eranian@google.com> Link: http://lkml.kernel.org/r/1437471846-26995-4-git-send-email-adrian.hunter@intel.com Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
2015-07-06perf record: Let user have timestamps with per-thread recordingAdrian Hunter
If the option -T is used with option --per-thread, then time is still not sampled. Fix that by using OPT_BOOLEAN_SET to distinguish when the user used the -T option as opposed to the default case when timestamps are enabled but only for per-cpu recording. Signed-off-by: Adrian Hunter <adrian.hunter@intel.com> Cc: David Ahern <dsahern@gmail.com> Cc: Jiri Olsa <jolsa@redhat.com> Cc: Namhyung Kim <namhyung@kernel.org> Link: http://lkml.kernel.org/r/1436183461-1918-1-git-send-email-adrian.hunter@intel.com Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
2015-06-19perf tools: Configurable per thread proc map processing time outKan Liang
The time out to limit the individual proc map processing was hard code to 500ms. This patch introduce a new option --proc-map-timeout to make the time limit configurable. Signed-off-by: Kan Liang <kan.liang@intel.com> Cc: Andi Kleen <andi@firstfloor.org> Cc: David Ahern <dsahern@gmail.com> Cc: Ying Huang <ying.huang@intel.com> Link: http://lkml.kernel.org/r/1434549071-25611-2-git-send-email-kan.liang@intel.com Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
2015-05-05perf tools: Add AUX area tracing Snapshot ModeAdrian Hunter
Add support for making snapshots of AUX area tracing data. Signed-off-by: Adrian Hunter <adrian.hunter@intel.com> Acked-by: Jiri Olsa <jolsa@kernel.org> Cc: David Ahern <dsahern@gmail.com> Cc: Frederic Weisbecker <fweisbec@gmail.com> Cc: Namhyung Kim <namhyung@gmail.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Stephane Eranian <eranian@google.com> Link: http://lkml.kernel.org/r/1430404667-10593-9-git-send-email-adrian.hunter@intel.com Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
2015-04-29perf auxtrace: Add support for AUX area recordingAdrian Hunter
Add support for reading from the AUX area tracing mmap and synthesizing AUX area tracing events. This patch introduces an abstraction for recording AUX area data. Recording is initialized by auxtrace_record__init() which is a weak function to be implemented by the architecture to provide recording callbacks. Recording is mainly handled by auxtrace_mmap__read() and perf_event__synthesize_auxtrace() but there are callbacks for miscellaneous needs including validating and processing user options, populating private data in auxtrace_info_event, and freeing the structure when finished. Signed-off-by: Adrian Hunter <adrian.hunter@intel.com> Acked-by: Jiri Olsa <jolsa@kernel.org> Cc: David Ahern <dsahern@gmail.com> Cc: Frederic Weisbecker <fweisbec@gmail.com> Cc: Namhyung Kim <namhyung@gmail.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Stephane Eranian <eranian@google.com> Link: http://lkml.kernel.org/r/1428594864-29309-5-git-send-email-adrian.hunter@intel.com Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
2015-04-08perf record: Add clockid parameterPeter Zijlstra
Teach perf-record about the new perf_event_attr::{use_clockid, clockid} fields. Add a simple parameter to set the clock (if any) to be used for the events to be recorded into the data file. Since we store the entire perf_event_attr in the EVENT_DESC section we also already store the used clockid in the data file. Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Acked-by: David Ahern <dsahern@gmail.com> Cc: "H. Peter Anvin" <hpa@zytor.com> Cc: Adrian Hunter <adrian.hunter@intel.com> Cc: Andrew Morton <akpm@linux-foundation.org> Cc: Jiri Olsa <jolsa@redhat.com> Cc: John Stultz <john.stultz@linaro.org> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Stephane Eranian <eranian@google.com> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Yunlong Song <yunlong.song@huawei.com> Link: http://lkml.kernel.org/r/20150407154851.GR23123@twins.programming.kicks-ass.net [ Conditionally define CLOCK_BOOTTIME, at least rhel6 doesn't have it - dsahern Ditto for CLOCK_MONOTONIC_RAW, sles11sp2 doesn't have it - yunlong.song ] Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
2015-03-26perf: Bump max number of cpus to 1024David Ahern
SPARC based systems currently support up to 1024 cpus (e.g. T5-8). Allow perf to work on those systems. Signed-off-by: David Ahern <david.ahern@oracle.com> Link: http://lkml.kernel.org/r/1427213438-127216-1-git-send-email-david.ahern@oracle.com Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
2015-02-25perf record: Support recording running/enabled timeAndi Kleen
Add an option to perf record to record running/enabled time for read events, similar to what stat does. This is useful to understand multiplexing problems. Right now the report support is not great, but at least report -D already supports it. Signed-off-by: Andi Kleen <ak@linux.intel.com> Acked-by: Jiri Olsa <jolsa@redhat.com> Cc: Namhyung Kim <namhyung@kernel.org> Link: http://lkml.kernel.org/r/1424819620-16043-1-git-send-email-andi@firstfloor.org [ Fixed the Documentation entry to match the OPT_BOOLEAN one ] Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
2014-11-16perf tools: Add core support for sampling intr machine state regsStephane Eranian
Add the infrastructure to setup, collect and report the interrupt machine state regs which can be captured by the kernel. Signed-off-by: Stephane Eranian <eranian@google.com> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Cc: cebbert.lkml@gmail.com Cc: Adrian Hunter <adrian.hunter@intel.com> Cc: Andi Kleen <ak@linux.intel.com> Cc: Arnaldo Carvalho de Melo <acme@kernel.org> Cc: David Ahern <dsahern@gmail.com> Cc: Don Zickus <dzickus@redhat.com> Cc: Jean Pihet <jean.pihet@linaro.org> Cc: Jiri Olsa <jolsa@kernel.org> Cc: Jiri Olsa <jolsa@redhat.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Namhyung Kim <namhyung@kernel.org> Cc: Paul Mackerras <paulus@samba.org> Cc: Stephane Eranian <eranian@google.com> Cc: Waiman Long <Waiman.Long@hp.com> Cc: Wang Nan <wangnan0@huawei.com> Link: http://lkml.kernel.org/r/1411559322-16548-4-git-send-email-eranian@google.com Signed-off-by: Ingo Molnar <mingo@kernel.org>
2014-10-29perf tools: Export usage string and option table of perf recordNamhyung Kim
Those are shared with other builtin commands like kvm, script. So make it accessable from them. This is a preparation of later change that limiting possible options. Signed-off-by: Namhyung Kim <namhyung@kernel.org> Acked-by: Hemant Kumar <hemant@linux.vnet.ibm.com> Cc: Alexander Yarygin <yarygin@linux.vnet.ibm.com> Cc: David Ahern <dsahern@gmail.com> Cc: Hemant Kumar <hemant@linux.vnet.ibm.com> Cc: Ingo Molnar <mingo@kernel.org> Cc: Jiri Olsa <jolsa@redhat.com> Cc: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com> Cc: Peter Zijlstra <peterz@infradead.org> Link: http://lkml.kernel.org/r/1413990949-13953-3-git-send-email-namhyung@kernel.org Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
2014-09-26perf tools: Move callchain config from record_opts to callchain_paramNamhyung Kim
So that all callchain config parameters can be read/written to a single place. It's a preparation to consolidate handling of all callchain options. Reviewed-by: David Ahern <dsahern@gmail.com> Signed-off-by: Namhyung Kim <namhyung@kernel.org> Acked-by: Jiri Olsa <jolsa@redhat.com> Cc: David Ahern <dsahern@gmail.com> Cc: Ingo Molnar <mingo@kernel.org> Cc: Jiri Olsa <jolsa@redhat.com> Cc: Milian Wolff <mail@milianw.de> Cc: Namhyung Kim <namhyung.kim@lge.com> Cc: Paul Mackerras <paulus@samba.org> Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Link: http://lkml.kernel.org/r/1411434104-5307-3-git-send-email-namhyung@kernel.org Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
2014-05-05perf tools: Move ACCESS_ONCE from perf.h headerJiri Olsa
Into tools/include/linux/compiler.h header. Acked-by: Arnaldo Carvalho de Melo <acme@redhat.com> Acked-by: Peter Zijlstra <peterz@infradead.org> Cc: Arnaldo Carvalho de Melo <acme@kernel.org> Cc: Corey Ashford <cjashfor@linux.vnet.ibm.com> Cc: Borislav Petkov <bp@suse.de> Cc: David Ahern <dsahern@gmail.com> Cc: Frederic Weisbecker <fweisbec@gmail.com> Cc: Ingo Molnar <mingo@kernel.org> Cc: Namhyung Kim <namhyung@kernel.org> Cc: Paul Mackerras <paulus@samba.org> Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Link: http://lkml.kernel.org/n/tip-9sk90owm370kuq3f0ssjjui2@git.kernel.org Signed-off-by: Jiri Olsa <jolsa@kernel.org>
2014-05-05perf tools: Move sys_perf_event_open function from perf.hJiri Olsa
Into perf-sys.h header, as requested by Peter: http://lkml.kernel.org/r/20140502115201.GI30445@twins.programming.kicks-ass.net Adding HAVE_ATTR_TEST define to turn off/on the attribute test code in the sys_perf_event_open function. Requested-by: Peter Zijlstra <a.p.zijlstra@chello.nl> Acked-by: Arnaldo Carvalho de Melo <acme@redhat.com> Acked-by: Peter Zijlstra <peterz@infradead.org> Cc: Arnaldo Carvalho de Melo <acme@kernel.org> Cc: Borislav Petkov <bp@suse.de> Cc: Corey Ashford <cjashfor@linux.vnet.ibm.com> Cc: David Ahern <dsahern@gmail.com> Cc: Frederic Weisbecker <fweisbec@gmail.com> Cc: Ingo Molnar <mingo@kernel.org> Cc: Namhyung Kim <namhyung@kernel.org> Cc: Paul Mackerras <paulus@samba.org> Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Link: http://lkml.kernel.org/r/1399293219-8732-10-git-send-email-jolsa@kernel.org Signed-off-by: Jiri Olsa <jolsa@kernel.org>
2014-05-05perf tools: Move syscall and arch specific defines from perf.hJiri Olsa
Into new perf-sys.h header. The main reason is to separate system specific perf data from perf tool stuff, so it could be used in small test programs, as requested Peter: http://lkml.kernel.org/r/20140502115201.GI30445@twins.programming.kicks-ass.net This separation makes the perf.h header more clear. Requested-by: Peter Zijlstra <a.p.zijlstra@chello.nl> Acked-by: Arnaldo Carvalho de Melo <acme@redhat.com> Acked-by: Peter Zijlstra <peterz@infradead.org> Cc: Arnaldo Carvalho de Melo <acme@kernel.org> Cc: Borislav Petkov <bp@suse.de> Cc: Corey Ashford <cjashfor@linux.vnet.ibm.com> Cc: David Ahern <dsahern@gmail.com> Cc: Frederic Weisbecker <fweisbec@gmail.com> Cc: Ingo Molnar <mingo@kernel.org> Cc: Namhyung Kim <namhyung@kernel.org> Cc: Paul Mackerras <paulus@samba.org> Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Link: http://lkml.kernel.org/r/1399293219-8732-9-git-send-email-jolsa@kernel.org Signed-off-by: Jiri Olsa <jolsa@kernel.org>
2014-05-05perf tools: Move perf_call_graph_mode enum from perf.hJiri Olsa
Into util/callchain.h header where all callchain related structures should be. Acked-by: Arnaldo Carvalho de Melo <acme@redhat.com> Acked-by: Peter Zijlstra <peterz@infradead.org> Cc: Arnaldo Carvalho de Melo <acme@kernel.org> Cc: Borislav Petkov <bp@suse.de> Cc: Corey Ashford <cjashfor@linux.vnet.ibm.com> Cc: David Ahern <dsahern@gmail.com> Cc: Frederic Weisbecker <fweisbec@gmail.com> Cc: Ingo Molnar <mingo@kernel.org> Cc: Namhyung Kim <namhyung@kernel.org> Cc: Paul Mackerras <paulus@samba.org> Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Link: http://lkml.kernel.org/r/1399293219-8732-8-git-send-email-jolsa@kernel.org Signed-off-by: Jiri Olsa <jolsa@kernel.org>
2014-05-05perf tools: Move sample data structures from perf.hJiri Olsa
Into util/event.h header where all sample data structures are defined. Acked-by: Arnaldo Carvalho de Melo <acme@redhat.com> Acked-by: Peter Zijlstra <peterz@infradead.org> Cc: Arnaldo Carvalho de Melo <acme@kernel.org> Cc: Borislav Petkov <bp@suse.de> Cc: Corey Ashford <cjashfor@linux.vnet.ibm.com> Cc: David Ahern <dsahern@gmail.com> Cc: Frederic Weisbecker <fweisbec@gmail.com> Cc: Ingo Molnar <mingo@kernel.org> Cc: Namhyung Kim <namhyung@kernel.org> Cc: Paul Mackerras <paulus@samba.org> Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Link: http://lkml.kernel.org/r/1399293219-8732-7-git-send-email-jolsa@kernel.org Signed-off-by: Jiri Olsa <jolsa@kernel.org>
2014-05-05perf tools: Remove PR_TASK_PERF_EVENTS_* from perf.hJiri Olsa
It's defined in include/uapi/linux/prctl.h header. Also it was never used in perf tool. Acked-by: Arnaldo Carvalho de Melo <acme@redhat.com> Acked-by: Peter Zijlstra <peterz@infradead.org> Cc: Arnaldo Carvalho de Melo <acme@kernel.org> Cc: Borislav Petkov <bp@suse.de> Cc: Corey Ashford <cjashfor@linux.vnet.ibm.com> Cc: David Ahern <dsahern@gmail.com> Cc: Frederic Weisbecker <fweisbec@gmail.com> Cc: Ingo Molnar <mingo@kernel.org> Cc: Namhyung Kim <namhyung@kernel.org> Cc: Paul Mackerras <paulus@samba.org> Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Link: http://lkml.kernel.org/r/1399293219-8732-6-git-send-email-jolsa@kernel.org Signed-off-by: Jiri Olsa <jolsa@kernel.org>
2014-05-05perf tools: Remove asmlinkage define from perf.hJiri Olsa
As it's no longer used. Acked-by: Arnaldo Carvalho de Melo <acme@redhat.com> Acked-by: Peter Zijlstra <peterz@infradead.org> Cc: Arnaldo Carvalho de Melo <acme@kernel.org> Cc: Borislav Petkov <bp@suse.de> Cc: Corey Ashford <cjashfor@linux.vnet.ibm.com> Cc: David Ahern <dsahern@gmail.com> Cc: Frederic Weisbecker <fweisbec@gmail.com> Cc: Ingo Molnar <mingo@kernel.org> Cc: Namhyung Kim <namhyung@kernel.org> Cc: Paul Mackerras <paulus@samba.org> Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Link: http://lkml.kernel.org/r/1399293219-8732-5-git-send-email-jolsa@kernel.org Signed-off-by: Jiri Olsa <jolsa@kernel.org>
2014-05-05perf tools: Remove min define from perf.hJiri Olsa
It's defined in tools/perf/util/include/linux/kernel.h header. Acked-by: Arnaldo Carvalho de Melo <acme@redhat.com> Acked-by: Peter Zijlstra <peterz@infradead.org> Cc: Arnaldo Carvalho de Melo <acme@kernel.org> Cc: Borislav Petkov <bp@suse.de> Cc: Corey Ashford <cjashfor@linux.vnet.ibm.com> Cc: David Ahern <dsahern@gmail.com> Cc: Frederic Weisbecker <fweisbec@gmail.com> Cc: Ingo Molnar <mingo@kernel.org> Cc: Namhyung Kim <namhyung@kernel.org> Cc: Paul Mackerras <paulus@samba.org> Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Link: http://lkml.kernel.org/r/1399293219-8732-4-git-send-email-jolsa@kernel.org Signed-off-by: Jiri Olsa <jolsa@kernel.org>
2014-05-05perf tools: Remove unlikely define from perf.hJiri Olsa
It's defined in tools/include/linux/compiler.h header. Acked-by: Arnaldo Carvalho de Melo <acme@redhat.com> Acked-by: Peter Zijlstra <peterz@infradead.org> Cc: Arnaldo Carvalho de Melo <acme@kernel.org> Cc: Borislav Petkov <bp@suse.de> Cc: Corey Ashford <cjashfor@linux.vnet.ibm.com> Cc: David Ahern <dsahern@gmail.com> Cc: Frederic Weisbecker <fweisbec@gmail.com> Cc: Ingo Molnar <mingo@kernel.org> Cc: Namhyung Kim <namhyung@kernel.org> Cc: Paul Mackerras <paulus@samba.org> Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Link: http://lkml.kernel.org/r/1399293219-8732-3-git-send-email-jolsa@kernel.org Signed-off-by: Jiri Olsa <jolsa@kernel.org>
2014-05-05perf tools: Remove MAX_COUNTERS define from perf.hJiri Olsa
As it's no longer used. Acked-by: Arnaldo Carvalho de Melo <acme@redhat.com> Acked-by: Peter Zijlstra <peterz@infradead.org> Cc: Arnaldo Carvalho de Melo <acme@kernel.org> Cc: Borislav Petkov <bp@suse.de> Cc: Corey Ashford <cjashfor@linux.vnet.ibm.com> Cc: David Ahern <dsahern@gmail.com> Cc: Frederic Weisbecker <fweisbec@gmail.com> Cc: Ingo Molnar <mingo@kernel.org> Cc: Namhyung Kim <namhyung@kernel.org> Cc: Paul Mackerras <paulus@samba.org> Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Link: http://lkml.kernel.org/r/1399293219-8732-2-git-send-email-jolsa@kernel.org Signed-off-by: Jiri Olsa <jolsa@kernel.org>
2014-05-01tools: Consolidate types.hBorislav Petkov
Combine all definitions into a common tools/include/linux/types.h and kill the wild growth elsewhere. Move DECLARE_BITMAP to its proper bitmap.h header. Signed-off-by: Borislav Petkov <bp@suse.de> Acked-by: Rusty Russell <rusty@rustcorp.com.au> Link: http://lkml.kernel.org/n/tip-azczs7qcv6h9xek9od10hiv2@git.kernel.org Signed-off-by: Jiri Olsa <jolsa@kernel.org>
2014-04-28perf tests: Add thread maps lookup automated testsJiri Olsa
Adding automated test for memory maps lookup within multiple machines threads. The test creates 4 threads and separated memory maps. It checks that we could use thread__find_addr_map function with thread object based on TID to find memory maps. Acked-by: Namhyung Kim <namhyung@kernel.org> Cc: Adrian Hunter <adrian.hunter@intel.com> Cc: Arnaldo Carvalho de Melo <acme@kernel.org> Cc: Corey Ashford <cjashfor@linux.vnet.ibm.com> Cc: David Ahern <dsahern@gmail.com> Cc: Don Zickus <dzickus@redhat.com> Cc: Frederic Weisbecker <fweisbec@gmail.com> Cc: Ingo Molnar <mingo@kernel.org> Cc: Mike Galbraith <efault@gmx.de> Cc: Namhyung Kim <namhyung@kernel.org> Cc: Paul Mackerras <paulus@samba.org> Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: Stephane Eranian <eranian@google.com> Link: http://lkml.kernel.org/r/1397490723-1992-2-git-send-email-jolsa@redhat.com Signed-off-by: Jiri Olsa <jolsa@kernel.org>
2014-04-06Merge git://git.kernel.org/pub/scm/linux/kernel/git/cmetcalf/linux-tileLinus Torvalds
Pull arch/tile updates from Chris Metcalf: "These fix a few stray build issues seen in linux-next, and also add the minimal required support for perf to tilegx" * git://git.kernel.org/pub/scm/linux/kernel/git/cmetcalf/linux-tile: arch/tile: remove unused variable 'devcap' tile: Fix vDSO compilation issue with allyesconfig perf tools: Allow building for tile tile/perf: Support perf_events on tilegx and tilepro tile: Enable NMIs on return from handle_nmi() without errors tile: Add support for handling PMC hardware tile: don't use __get_cpu_var() with structure-typed arguments tile: avoid overflow in ns2cycles
2014-03-14perf bench: Add futex-hash microbenchmarkDavidlohr Bueso
Introduce futexes to perf-bench and add a program that stresses and measures the kernel's implementation of the hash table. This is a multi-threaded program that simply measures the amount of failed futex wait calls - we only want to deal with the hashing overhead, so a negative return of futex_wait_setup() is enough to do the trick. An example run: $ perf bench futex hash -t 32 Run summary [PID 10989]: 32 threads, each operating on 1024 [private] futexes for 10 secs. [thread 0] futexes: 0x19d9b10 ... 0x19dab0c [ 418713 ops/sec ] [thread 1] futexes: 0x19daca0 ... 0x19dbc9c [ 469913 ops/sec ] [thread 2] futexes: 0x19dbe30 ... 0x19dce2c [ 479744 ops/sec ] ... [thread 31] futexes: 0x19fbb80 ... 0x19fcb7c [ 464179 ops/sec ] Averaged 454310 operations/sec (+- 0.84%), total secs = 10 Signed-off-by: Davidlohr Bueso <davidlohr@hp.com> Acked-by: Darren Hart <dvhart@linux.intel.com> Cc: Aswin Chandramouleeswaran <aswin@hp.com> Cc: Darren Hart <dvhart@linux.intel.com> Cc: Ingo Molnar <mingo@redhat.com> Cc: Jason Low <jason.low2@hp.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Scott J Norton <scott.norton@hp.com> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Waiman Long <Waiman.Long@hp.com> Link: http://lkml.kernel.org/r/1387081917-9102-2-git-send-email-davidlohr@hp.com Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
2014-03-07perf tools: Allow building for tileZhigang Lu
Tested by building perf: - Cross-compiled for tile on x86_64 - Built natively on tile Signed-off-by: Zhigang Lu <zlu@tilera.com> Signed-off-by: Chris Metcalf <cmetcalf@tilera.com>
2014-02-18perf record: Add readable output for callchain debugJiri Olsa
Adding people readable output for callchain debug, to get following '-v' output: $ perf record -v -g ls callchain: type DWARF callchain: stack dump size 4096 ... Signed-off-by: Jiri Olsa <jolsa@redhat.com> Cc: Adrian Hunter <adrian.hunter@intel.com> Cc: Andi Kleen <andi@firstfloor.org> Cc: Corey Ashford <cjashfor@linux.vnet.ibm.com> Cc: David Ahern <dsahern@gmail.com> Cc: Ingo Molnar <mingo@elte.hu> Cc: Namhyung Kim <namhyung@kernel.org> Cc: Paul Mackerras <paulus@samba.org> Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Link: http://lkml.kernel.org/r/1391427883-13443-3-git-send-email-jolsa@redhat.com Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
2014-02-18perf tools: Add call-graph option support into .perfconfigJiri Olsa
Adding call-graph option support into .perfconfig file, so it's now possible use call-graph option like: [top] call-graph = fp [record] call-graph = dwarf,8192 Above options ONLY setup the unwind method. To enable perf record/top to actually use it the command line option -g/-G must be specified. The --call-graph option overloads .perfconfig setup. Assuming above configuration: $ perf record -g ls - enables dwarf unwind with user stack size dump 8192 bytes $ perf top -G - enables frame pointer unwind $ perf record --call-graph=fp ls - enables frame pointer unwind $ perf top --call-graph=dwarf,4096 ls - enables dwarf unwind with user stack size dump 4096 bytes Signed-off-by: Jiri Olsa <jolsa@redhat.com> Cc: Adrian Hunter <adrian.hunter@intel.com> Cc: Andi Kleen <andi@firstfloor.org> Cc: Corey Ashford <cjashfor@linux.vnet.ibm.com> Cc: David Ahern <dsahern@gmail.com> Cc: Ingo Molnar <mingo@elte.hu> Cc: Namhyung Kim <namhyung@kernel.org> Cc: Paul Mackerras <paulus@samba.org> Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Link: http://lkml.kernel.org/r/1391427883-13443-2-git-send-email-jolsa@redhat.com Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
2014-01-29perf tools: Fix AAAAARGH64 memory barriersPeter Zijlstra
Someone got the load and store barriers mixed up for AAAAARGH64. Turn them the right side up. Reported-by: Will Deacon <will.deacon@arm.com> Signed-off-by: Peter Zijlstra <peterz@infradead.org> Fixes: a94d342b9cb0 ("tools/perf: Add required memory barriers") Cc: Ingo Molnar <mingo@kernel.org> Cc: Will Deacon <will.deacon@arm.com> Link: http://lkml.kernel.org/r/20140124154002.GF31570@twins.programming.kicks-ass.net Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
2014-01-20perf tools: Add support for the xtensa architectureBaruch Siach
Tested using kernel tracepoints on a QEMU simulated environment. Kernel support for perf depends on the patch "xtensa: enable HAVE_PERF_EVENTS", which is scheduled for v3.14. Hardware performance counters are not supported under xtensa yet. Acked-by: Ingo Molnar <mingo@kernel.org> Acked-by: Max Filippov <jcmvbkbc@gmail.com> Cc: Ingo Molnar <mingo@redhat.com> Cc: Paul Mackerras <paulus@samba.org> Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: linux-xtensa@linux-xtensa.org Link: http://lkml.kernel.org/r/aafcdb22f04e2d3188d2938528939481be56b649.1389608855.git.baruch@tkos.co.il Signed-off-by: Baruch Siach <baruch@tkos.co.il> Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
2014-01-14perf record: Rename --no-delay to --no-bufferingArnaldo Carvalho de Melo
That is how the option summary describes it and so that we can free --delay to replace --initial-delay and then be consistent with stat's --delay equivalent option. Suggested-by: Ingo Molnar <mingo@kernel.org> Cc: Adrian Hunter <adrian.hunter@intel.com> Cc: David Ahern <dsahern@gmail.com> Cc: Frederic Weisbecker <fweisbec@gmail.com> Cc: Jiri Olsa <jolsa@redhat.com> Cc: Mike Galbraith <efault@gmx.de> Cc: Namhyung Kim <namhyung@kernel.org> Cc: Paul Mackerras <paulus@samba.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Stephane Eranian <eranian@google.com> Link: http://lkml.kernel.org/n/tip-f8hd2010uhjl2zzb34hepbmi@git.kernel.org Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
2014-01-13perf record: Add --initial-delay optionAndi Kleen
perf stat has a --delay option to delay measuring the workload. This is useful to skip measuring the startup phase of the program, which is often very different from the main workload. The same is useful for perf record when sampling. --no-delay was already taken, so add a --initial-delay to perf record too. -D was already taken for record, so there is only a long option. v2: Don't disable group members (Namhyung Kim) v3: port to latest perf/core rename to --initial-delay to avoid conflict with --no-delay Signed-off-by: Andi Kleen <ak@linux.intel.com> Acked-by: Namhyung Kim <namhyung@kernel.org> Cc: Jiri Olsa <jolsa@redhat.com> Cc: Namhyung Kim <namhyung@kernel.org> Link: http://lkml.kernel.org/r/1389476307-2124-1-git-send-email-andi@firstfloor.org Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
2013-12-19perf tools: Rename 'perf_record_opts' to 'record_optsArnaldo Carvalho de Melo
Reduce typing, functions use class__method convention, so unlikely to clash with other libraries. This actually was discussed in the "Link:" referenced message below. Cc: Adrian Hunter <adrian.hunter@intel.com> Cc: David Ahern <dsahern@gmail.com> Cc: Frederic Weisbecker <fweisbec@gmail.com> Cc: Jiri Olsa <jolsa@redhat.com> Cc: Mike Galbraith <efault@gmx.de> Cc: Namhyung Kim <namhyung@kernel.org> Cc: Paul Mackerras <paulus@samba.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Stephane Eranian <eranian@google.com> Link: http://lkml.kernel.org/r/20131112113427.GA4053@ghostprotocols.net Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
2013-11-27perf record: Default -t option to no inheritanceAdrian Hunter
The change to per-cpu mmaps causes the -p, -t and -u options now to have inheritance enabled by default. Change that back to no inheritance but for the -t option only. Requested-by: Peter Zijlstra <peterz@infradead.org> Signed-off-by: Adrian Hunter <adrian.hunter@intel.com> Cc: David Ahern <dsahern@gmail.com> Cc: Frederic Weisbecker <fweisbec@gmail.com> Cc: Ingo Molnar <mingo@redhat.com> Cc: Jiri Olsa <jolsa@redhat.com> Cc: Mike Galbraith <efault@gmx.de> Cc: Namhyung Kim <namhyung@gmail.com> Cc: Paul Mackerras <paulus@samba.org> Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: Stephane Eranian <eranian@google.com> Link: http://lkml.kernel.org/r/1384768557-23331-5-git-send-email-adrian.hunter@intel.com Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
2013-11-12perf target: Shorten perf_target__ to target__Arnaldo Carvalho de Melo
Getting unwieldly long, for this app domain should be descriptive enough and the use of __ to separate the class from the method names should help with avoiding clashes with other code bases. Reported-by: David Ahern <dsahern@gmail.com> Suggested-by: Ingo Molnar <mingo@kernel.org> Cc: Adrian Hunter <adrian.hunter@intel.com> Cc: David Ahern <dsahern@gmail.com> Cc: Frederic Weisbecker <fweisbec@gmail.com> Cc: Jiri Olsa <jolsa@redhat.com> Cc: Mike Galbraith <efault@gmx.de> Cc: Namhyung Kim <namhyung@kernel.org> Cc: Paul Mackerras <paulus@samba.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Stephane Eranian <eranian@google.com> Link: http://lkml.kernel.org/r/20131112113427.GA4053@ghostprotocols.net Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
2013-11-06tools/perf: Add required memory barriersPeter Zijlstra
To match patch bf378d341e48 ("perf: Fix perf ring buffer memory ordering") change userspace to also adhere to the ordering outlined. Signed-off-by: Peter Zijlstra <peterz@infradead.org> Cc: Michael Neuling <mikey@neuling.org> Cc: "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> Cc: james.hogan@imgtec.com Cc: Vince Weaver <vince@deater.net> Cc: Victor Kaplansky <VICTORK@il.ibm.com> Cc: Oleg Nesterov <oleg@redhat.com> Cc: Anton Blanchard <anton@samba.org> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> Cc: Frederic Weisbecker <fweisbec@gmail.com> Cc: Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca> Cc: Michael Ellerman <michael@ellerman.id.au> Link: http://lkml.kernel.org/r/20131030104246.GH16117@laptop.programming.kicks-ass.net Signed-off-by: Ingo Molnar <mingo@kernel.org>
2013-10-21perf tools: Add data object to handle perf data fileJiri Olsa
This patch is adding 'struct perf_data_file' object as a placeholder for all attributes regarding perf.data file handling. Changing perf_session__new to take it as an argument. The rest of the functionality will be added later to keep this change simple enough, because all the places using perf_session are changed now. Signed-off-by: Jiri Olsa <jolsa@redhat.com> Acked-by: Namhyung Kim <namhyung@kernel.org> Cc: Adrian Hunter <adrian.hunter@intel.com> Cc: Andi Kleen <andi@firstfloor.org> Cc: Corey Ashford <cjashfor@linux.vnet.ibm.com> Cc: David Ahern <dsahern@gmail.com> Cc: Frederic Weisbecker <fweisbec@gmail.com> Cc: Ingo Molnar <mingo@elte.hu> Cc: Namhyung Kim <namhyung@kernel.org> Cc: Paul Mackerras <paulus@samba.org> Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Link: http://lkml.kernel.org/r/1381847254-28809-2-git-send-email-jolsa@redhat.com Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
2013-10-04tools/perf: Add support for record transaction flagsAndi Kleen
Add support for recording and displaying the transaction flags. They are essentially a new sort key. Also display them in a nice way to the user. Signed-off-by: Andi Kleen <ak@linux.intel.com> Acked-by: Jiri Olsa <jolsa@redhat.com> Signed-off-by: Peter Zijlstra <peterz@infradead.org> Link: http://lkml.kernel.org/r/1379688044-14173-6-git-send-email-andi@firstfloor.org Signed-off-by: Ingo Molnar <mingo@kernel.org>
2013-10-04tools/perf: Support sorting by in_tx or abort branch flagsAndi Kleen
Extend the perf branch sorting code to support sorting by in_tx or abort_tx qualifiers. Also print out those qualifiers. This also fixes up some of the existing sort key documentation. We do not support no_tx here, because it's simply not showing the in_tx flag. Signed-off-by: Andi Kleen <ak@linux.intel.com> Acked-by: Jiri Olsa <jolsa@redhat.com> Signed-off-by: Peter Zijlstra <peterz@infradead.org> Link: http://lkml.kernel.org/r/1379688044-14173-4-git-send-email-andi@firstfloor.org Signed-off-by: Ingo Molnar <mingo@kernel.org>
2013-08-12perf kvm: Option to print events that exceed a durationDavid Ahern
This is useful to spot high latency blips. It is normal for HLT reasons to have long exit times, so strip those from the duration check. v2: changed threshold to duration per acme's request Signed-off-by: David Ahern <dsahern@gmail.com> Cc: Frederic Weisbecker <fweisbec@gmail.com> Cc: Ingo Molnar <mingo@kernel.org> Cc: Jiri Olsa <jolsa@redhat.com> Cc: Namhyung Kim <namhyung@kernel.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Runzhen Wang <runzhen@linux.vnet.ibm.com> Cc: Xiao Guangrong <xiaoguangrong@linux.vnet.ibm.com> Link: http://lkml.kernel.org/r/1375926999-75129-1-git-send-email-dsahern@gmail.com Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
2013-04-01perf tools: Add support for weight v7 (modified)Andi Kleen
perf record has a new option -W that enables weightened sampling. Add sorting support in top/report for the average weight per sample and the total weight sum. This allows to both compare relative cost per event and the total cost over the measurement period. Add the necessary glue to perf report, record and the library. v2: Merge with new hist refactoring. v3: Fix manpage. Remove value check. Rename global_weight to weight and weight to local_weight. v4: Readd sort keys to manpage v5: Move weight to end v6: Move weight to template v7: Rename weight key. Original patch from Andi modified by Stephane Eranian <eranian@google.com> to include ONLY the weight supporting code and apply to pristine 3.8.0-rc4. Signed-off-by: Andi Kleen <ak@linux.intel.com> Cc: Ingo Molnar <mingo@elte.hu> Cc: Jiri Olsa <jolsa@redhat.com> Cc: Namhyung Kim <namhyung.kim@lge.com> Cc: Peter Zijlstra <peterz@infradead.org> Link: http://lkml.kernel.org/r/1359040242-8269-6-git-send-email-eranian@google.com [ committer note: changed to cope with fc5871ed and the hists_link perf test entry ] Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
2013-03-03Merge tag 'metag-v3.9-rc1-v4' of ↵Linus Torvalds
git://git.kernel.org/pub/scm/linux/kernel/git/jhogan/metag Pull new ImgTec Meta architecture from James Hogan: "This adds core architecture support for Imagination's Meta processor cores, followed by some later miscellaneous arch/metag cleanups and fixes which I kept separate to ease review: - Support for basic Meta 1 (ATP) and Meta 2 (HTP) core architecture - A few fixes all over, particularly for symbol prefixes - A few privilege protection fixes - Several cleanups (setup.c includes, split out a lot of metag_ksyms.c) - Fix some missing exports - Convert hugetlb to use vm_unmapped_area() - Copy device tree to non-init memory - Provide dma_get_sgtable()" * tag 'metag-v3.9-rc1-v4' of git://git.kernel.org/pub/scm/linux/kernel/git/jhogan/metag: (61 commits) metag: Provide dma_get_sgtable() metag: prom.h: remove declaration of metag_dt_memblock_reserve() metag: copy devicetree to non-init memory metag: cleanup metag_ksyms.c includes metag: move mm/init.c exports out of metag_ksyms.c metag: move usercopy.c exports out of metag_ksyms.c metag: move setup.c exports out of metag_ksyms.c metag: move kick.c exports out of metag_ksyms.c metag: move traps.c exports out of metag_ksyms.c metag: move irq enable out of irqflags.h on SMP genksyms: fix metag symbol prefix on crc symbols metag: hugetlb: convert to vm_unmapped_area() metag: export clear_page and copy_page metag: export metag_code_cache_flush_all metag: protect more non-MMU memory regions metag: make TXPRIVEXT bits explicit metag: kernel/setup.c: sort includes perf: Enable building perf tools for Meta metag: add boot time LNKGET/LNKSET check metag: add __init to metag_cache_probe() ...
2013-03-02perf: Enable building perf tools for MetaJames Hogan
Define rmb(), cpu_relax(), and CPUINFO_PROC for Meta so that the perf tools can be built for Meta. Signed-off-by: James Hogan <james.hogan@imgtec.com> Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: Paul Mackerras <paulus@samba.org> Cc: Ingo Molnar <mingo@redhat.com> Cc: Arnaldo Carvalho de Melo <acme@ghostprotocols.net>
2013-03-02Merge tag 'arc-v3.9-rc1-late' of ↵Linus Torvalds
git://git.kernel.org/pub/scm/linux/kernel/git/vgupta/arc Pull new ARC architecture from Vineet Gupta: "Initial ARC Linux port with some fixes on top for 3.9-rc1: I would like to introduce the Linux port to ARC Processors (from Synopsys) for 3.9-rc1. The patch-set has been discussed on the public lists since Nov and has received a fair bit of review, specially from Arnd, tglx, Al and other subsystem maintainers for DeviceTree, kgdb... The arch bits are in arch/arc, some asm-generic changes (acked by Arnd), a minor change to PARISC (acked by Helge). The series is a touch bigger for a new port for 2 main reasons: 1. It enables a basic kernel in first sub-series and adds ptrace/kgdb/.. later 2. Some of the fallout of review (DeviceTree support, multi-platform- image support) were added on top of orig series, primarily to record the revision history. This updated pull request additionally contains - fixes due to our GNU tools catching up with the new syscall/ptrace ABI - some (minor) cross-arch Kconfig updates." * tag 'arc-v3.9-rc1-late' of git://git.kernel.org/pub/scm/linux/kernel/git/vgupta/arc: (82 commits) ARC: split elf.h into uapi and export it for userspace ARC: Fixup the current ABI version ARC: gdbserver using regset interface possibly broken ARC: Kconfig cleanup tracking cross-arch Kconfig pruning in merge window ARC: make a copy of flat DT ARC: [plat-arcfpga] DT arc-uart bindings change: "baud" => "current-speed" ARC: Ensure CONFIG_VIRT_TO_BUS is not enabled ARC: Fix pt_orig_r8 access ARC: [3.9] Fallout of hlist iterator update ARC: 64bit RTSC timestamp hardware issue ARC: Don't fiddle with non-existent caches ARC: Add self to MAINTAINERS ARC: Provide a default serial.h for uart drivers needing BASE_BAUD ARC: [plat-arcfpga] defconfig for fully loaded ARC Linux ARC: [Review] Multi-platform image #8: platform registers SMP callbacks ARC: [Review] Multi-platform image #7: SMP common code to use callbacks ARC: [Review] Multi-platform image #6: cpu-to-dma-addr optional ARC: [Review] Multi-platform image #5: NR_IRQS defined by ARC core ARC: [Review] Multi-platform image #4: Isolate platform headers ARC: [Review] Multi-platform image #3: switch to board callback ...
2013-02-15perf, ARC: Enable building perf tools for ARCVineet Gupta
Although with uClibc there's more we need to do Signed-off-by: Vineet Gupta <vgupta@synopsys.com> Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: Paul Mackerras <paulus@samba.org> Cc: Ingo Molnar <mingo@redhat.com> Cc: Arnaldo Carvalho de Melo <acme@ghostprotocols.net>
2013-02-06perf evlist: Make event_copy local to mmapsDavid Ahern
I am getting segfaults *after* the time sorting of perf samples where the event type is off the charts: (gdb) bt \#0 0x0807b1b2 in hists__inc_nr_events (hists=0x80a99c4, type=1163281902) at util/hist.c:1225 \#1 0x08070795 in perf_session_deliver_event (session=0x80a9b90, event=0xf7a6aff8, sample=0xffffc318, tool=0xffffc520, file_offset=0) at util/session.c:884 \#2 0x0806f9b9 in flush_sample_queue (s=0x80a9b90, tool=0xffffc520) at util/session.c:555 \#3 0x0806fc53 in process_finished_round (tool=0xffffc520, event=0x0, session=0x80a9b90) at util/session.c:645 This is bizarre because the event has already been processed once -- before it was added to the samples queue -- and the event was found to be sane at that time. There seem to be 2 causes: 1. perf_evlist__mmap_read updates the read location even though there are outstanding references to events sitting in the mmap buffers via the ordered samples queue. 2. There is a single evlist->event_copy for all evlist entries. event_copy is used to handle an event wrapping at the mmap buffer boundary. This patch addresses the second problem - making event_copy local to each perf_mmap. With this change my highly repeatable use case no longer fails. The first problem is much more complicated and will be the subject of a future patch. Signed-off-by: David Ahern <dsahern@gmail.com> Cc: Frederic Weisbecker <fweisbec@gmail.com> Cc: Ingo Molnar <mingo@kernel.org> Cc: Jiri Olsa <jolsa@redhat.com> Cc: Namhyung Kim <namhyung@kernel.org> Cc: Peter Zijlstra <peterz@infradead.org> Link: http://lkml.kernel.org/r/1360098762-61827-1-git-send-email-dsahern@gmail.com Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
2013-01-24perf tools: Move get_term_dimensions from top to util.cDavid Ahern
It is used by util/help.c so it should be a lib function and included in libperf.a. Code move only. Signed-off-by: David Ahern <dsahern@gmail.com> Link: http://lkml.kernel.org/r/1358185681-90926-1-git-send-email-dsahern@gmail.com Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
2013-01-24perf evsel: Do missing feature fallbacks in just one placeArnaldo Carvalho de Melo
Instead of doing it in stat, top, record or any other tool that opens event descriptors. Cc: David Ahern <dsahern@gmail.com> Cc: Frederic Weisbecker <fweisbec@gmail.com> Cc: Jiri Olsa <jolsa@redhat.com> Cc: Mike Galbraith <efault@gmx.de> Cc: Namhyung Kim <namhyung@gmail.com> Cc: Paul Mackerras <paulus@samba.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Stephane Eranian <eranian@google.com> Link: http://lkml.kernel.org/n/tip-vr8hzph83d5t2mdlkf565h84@git.kernel.org Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
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