kernel.git/tools/perf/util/evlist.c, branch linux-3.3.y

perf evlist: Return first evsel for non-sample event on old kernel

2012-02-29T21:29:44Z

On old kernels that don't support sample_id_all feature, perf_evlist__id2evsel() returns NULL for non-sampling events. This breaks perf top when multiple events are given on command line. Fix it by using first evsel in the evlist. This will also prevent getting the same (potential) problem in such new tool/ old kernel combo. Suggested-by: Arnaldo Carvalho de Melo Cc: Ingo Molnar Cc: Paul Mackerras Cc: Peter Zijlstra Link: http://lkml.kernel.org/r/1329702447-25045-1-git-send-email-namhyung.kim@lge.com Signed-off-by: Namhyung Kim Signed-off-by: Arnaldo Carvalho de Melo

perf kvm: Do guest-only counting by default

2012-01-06T17:47:37Z

Make use of exclude_guest and exlude_host in perf-kvm to do only guest-only counting by default. Cc: Gleb Natapov Cc: Ingo Molnar Cc: Joerg Roedel Cc: Peter Zijlstra Signed-off-by: Gleb Natapov Signed-off-by: Joerg Roedel [ committer note: Moved perf_{guest,host} & event_attr_init to util.c ] [ so as not to drag more stuff to the python binding] Signed-off-by: Arnaldo Carvalho de Melo

perf: builtin-record: Document and check that mmap_pages must be a power of two.

2011-12-23T18:53:58Z

Now that we automatically point users at it, let's provide them some guidance so that they hopefully don't just get mysterious EINVAL's from the kernel. Cc: Ingo Molnar Cc: Paul Mackerras Cc: Peter Zijlstra Link: http://lkml.kernel.org/r/1324301972-22740-4-git-send-email-nelhage@nelhage.com Signed-off-by: Nelson Elhage [ committer note: Made it work after 50a682c ] Signed-off-by: Arnaldo Carvalho de Melo

perf evlist: Fix errno value reporting on failed mmap

2011-12-20T15:31:15Z

On failure, perf_evlist__mmap_per_{cpu,thread} will try to munmap() every map that doesn't have a NULL base. This will fail with EINVAL if one of them has base == MAP_FAILED, clobbering errno, so that perf_evlist__map will return EINVAL on any failure regardless of the root cause. Fix this by resetting failed maps to a NULL base. Acked-by: Namhyung Kim Cc: Ingo Molnar Cc: Paul Mackerras Cc: Peter Zijlstra Link: http://lkml.kernel.org/r/1324301972-22740-2-git-send-email-nelhage@nelhage.com Signed-off-by: Nelson Elhage Signed-off-by: Arnaldo Carvalho de Melo

perf evlist: Always do automatic allocation of pollfd and mmap structures

2011-11-29T10:05:52Z

At first tools were required to do that, but while writing the python bindings to simplify the API I made them auto-allocate when needed. This just makes record, stat and top use that auto allocation, simplifying them a bit. Cc: David Ahern Cc: Frederic Weisbecker Cc: Mike Galbraith Cc: Paul Mackerras Cc: Peter Zijlstra Cc: Stephane Eranian Link: http://lkml.kernel.org/n/tip-iokhcvkzzijr3keioubx8hlq@git.kernel.org Signed-off-by: Arnaldo Carvalho de Melo

perf tools: Save some loops using perf_evlist__id2evsel

2011-11-28T19:57:40Z

Since we already ask for PERF_SAMPLE_ID and use it to quickly find the associated evsel, add handler func + data to struct perf_evsel to avoid using chains of if(strcmp(event_name)) and also to avoid all the linear list searches via trace_event_find. To demonstrate the technique convert 'perf sched' to it: # perf sched record sleep 5m And then: Performance counter stats for '/tmp/oldperf sched lat': 646.929438 task-clock # 0.999 CPUs utilized 9 context-switches # 0.000 M/sec 0 CPU-migrations # 0.000 M/sec 20,901 page-faults # 0.032 M/sec 1,290,144,450 cycles # 1.994 GHz stalled-cycles-frontend stalled-cycles-backend 1,606,158,439 instructions # 1.24 insns per cycle 339,088,395 branches # 524.151 M/sec 4,550,735 branch-misses # 1.34% of all branches 0.647524759 seconds time elapsed Versus: Performance counter stats for 'perf sched lat': 473.564691 task-clock # 0.999 CPUs utilized 9 context-switches # 0.000 M/sec 0 CPU-migrations # 0.000 M/sec 20,903 page-faults # 0.044 M/sec 944,367,984 cycles # 1.994 GHz stalled-cycles-frontend stalled-cycles-backend 1,442,385,571 instructions # 1.53 insns per cycle 308,383,106 branches # 651.195 M/sec 4,481,784 branch-misses # 1.45% of all branches 0.474215751 seconds time elapsed [root@emilia ~]# Cc: David Ahern Cc: Frederic Weisbecker Cc: Mike Galbraith Cc: Paul Mackerras Cc: Peter Zijlstra Cc: Stephane Eranian Link: http://lkml.kernel.org/n/tip-1kbzpl74lwi6lavpqke2u2p3@git.kernel.org Signed-off-by: Arnaldo Carvalho de Melo

perf evlist: Introduce id_hdr_size method out of perf_session

2011-11-28T12:37:29Z

We will need this when not using perf_session in cases like 'perf top' and strace where no perf.data file is created nor consumed. Cc: David Ahern Cc: Frederic Weisbecker Cc: Mike Galbraith Cc: Paul Mackerras Cc: Peter Zijlstra Cc: Stephane Eranian Link: http://lkml.kernel.org/n/tip-za923wjc41q5xot5vrhuhj3j@git.kernel.org Signed-off-by: Arnaldo Carvalho de Melo

perf evlist: Handle default value for 'pages' on mmap method

2011-11-28T12:26:43Z

Every tool that calls this and allows the user to override the value needs this logic. Cc: David Ahern Cc: Frederic Weisbecker Cc: Mike Galbraith Cc: Paul Mackerras Cc: Peter Zijlstra Cc: Stephane Eranian Link: http://lkml.kernel.org/n/tip-lwscxpg57xfzahz5dmdfp9uz@git.kernel.org Signed-off-by: Arnaldo Carvalho de Melo

perf evlist: Introduce {prepare,start}_workload refactored from 'perf record'

2011-11-28T12:26:14Z

So that we can easily start a workload in other tools. Cc: David Ahern Cc: Frederic Weisbecker Cc: Mike Galbraith Cc: Paul Mackerras Cc: Peter Zijlstra Cc: Stephane Eranian Link: http://lkml.kernel.org/n/tip-zdsksd4aphu0nltg2lpwsw3x@git.kernel.org Signed-off-by: Arnaldo Carvalho de Melo

perf evsel: Introduce config attr method

2011-11-28T12:25:31Z

Out of the code in 'perf record', so that we can share option parsing, etc. Eventually will be used by 'perf top', but first 'trace' will use it. Cc: David Ahern Cc: Frederic Weisbecker Cc: Mike Galbraith Cc: Paul Mackerras Cc: Peter Zijlstra Cc: Stephane Eranian Link: http://lkml.kernel.org/n/tip-hzjqsgnte1esk90ytq0ap98v@git.kernel.org Signed-off-by: Arnaldo Carvalho de Melo