| perf-record(1) |
| ============== |
| |
| NAME |
| ---- |
| perf-record - Run a command and record its profile into perf.data |
| |
| SYNOPSIS |
| -------- |
| [verse] |
| 'perf record' [-e <EVENT> | --event=EVENT] [-l] [-a] <command> |
| 'perf record' [-e <EVENT> | --event=EVENT] [-l] [-a] -- <command> [<options>] |
| |
| DESCRIPTION |
| ----------- |
| This command runs a command and gathers a performance counter profile |
| from it, into perf.data - without displaying anything. |
| |
| This file can then be inspected later on, using 'perf report'. |
| |
| |
| OPTIONS |
| ------- |
| <command>...:: |
| Any command you can specify in a shell. |
| |
| -e:: |
| --event=:: |
| Select the PMU event. Selection can be: |
| |
| - a symbolic event name (use 'perf list' to list all events) |
| |
| - a raw PMU event (eventsel+umask) in the form of rNNN where NNN is a |
| hexadecimal event descriptor. |
| |
| - a hardware breakpoint event in the form of '\mem:addr[:access]' |
| where addr is the address in memory you want to break in. |
| Access is the memory access type (read, write, execute) it can |
| be passed as follows: '\mem:addr[:[r][w][x]]'. |
| If you want to profile read-write accesses in 0x1000, just set |
| 'mem:0x1000:rw'. |
| |
| --filter=<filter>:: |
| Event filter. |
| |
| -a:: |
| --all-cpus:: |
| System-wide collection from all CPUs. |
| |
| -l:: |
| Scale counter values. |
| |
| -p:: |
| --pid=:: |
| Record events on existing process ID (comma separated list). |
| |
| -t:: |
| --tid=:: |
| Record events on existing thread ID (comma separated list). |
| This option also disables inheritance by default. Enable it by adding |
| --inherit. |
| |
| -u:: |
| --uid=:: |
| Record events in threads owned by uid. Name or number. |
| |
| -r:: |
| --realtime=:: |
| Collect data with this RT SCHED_FIFO priority. |
| |
| --no-buffering:: |
| Collect data without buffering. |
| |
| -c:: |
| --count=:: |
| Event period to sample. |
| |
| -o:: |
| --output=:: |
| Output file name. |
| |
| -i:: |
| --no-inherit:: |
| Child tasks do not inherit counters. |
| -F:: |
| --freq=:: |
| Profile at this frequency. |
| |
| -m:: |
| --mmap-pages=:: |
| Number of mmap data pages (must be a power of two) or size |
| specification with appended unit character - B/K/M/G. The |
| size is rounded up to have nearest pages power of two value. |
| |
| -g:: |
| Enables call-graph (stack chain/backtrace) recording. |
| |
| --call-graph:: |
| Setup and enable call-graph (stack chain/backtrace) recording, |
| implies -g. |
| |
| Allows specifying "fp" (frame pointer) or "dwarf" |
| (DWARF's CFI - Call Frame Information) as the method to collect |
| the information used to show the call graphs. |
| |
| In some systems, where binaries are build with gcc |
| --fomit-frame-pointer, using the "fp" method will produce bogus |
| call graphs, using "dwarf", if available (perf tools linked to |
| the libunwind library) should be used instead. |
| |
| -q:: |
| --quiet:: |
| Don't print any message, useful for scripting. |
| |
| -v:: |
| --verbose:: |
| Be more verbose (show counter open errors, etc). |
| |
| -s:: |
| --stat:: |
| Per thread counts. |
| |
| -d:: |
| --data:: |
| Sample addresses. |
| |
| -T:: |
| --timestamp:: |
| Sample timestamps. Use it with 'perf report -D' to see the timestamps, |
| for instance. |
| |
| -n:: |
| --no-samples:: |
| Don't sample. |
| |
| -R:: |
| --raw-samples:: |
| Collect raw sample records from all opened counters (default for tracepoint counters). |
| |
| -C:: |
| --cpu:: |
| Collect samples only on the list of CPUs provided. Multiple CPUs can be provided as a |
| comma-separated list with no space: 0,1. Ranges of CPUs are specified with -: 0-2. |
| In per-thread mode with inheritance mode on (default), samples are captured only when |
| the thread executes on the designated CPUs. Default is to monitor all CPUs. |
| |
| -N:: |
| --no-buildid-cache:: |
| Do not update the builid cache. This saves some overhead in situations |
| where the information in the perf.data file (which includes buildids) |
| is sufficient. |
| |
| -G name,...:: |
| --cgroup name,...:: |
| monitor only in the container (cgroup) called "name". This option is available only |
| in per-cpu mode. The cgroup filesystem must be mounted. All threads belonging to |
| container "name" are monitored when they run on the monitored CPUs. Multiple cgroups |
| can be provided. Each cgroup is applied to the corresponding event, i.e., first cgroup |
| to first event, second cgroup to second event and so on. It is possible to provide |
| an empty cgroup (monitor all the time) using, e.g., -G foo,,bar. Cgroups must have |
| corresponding events, i.e., they always refer to events defined earlier on the command |
| line. |
| |
| -b:: |
| --branch-any:: |
| Enable taken branch stack sampling. Any type of taken branch may be sampled. |
| This is a shortcut for --branch-filter any. See --branch-filter for more infos. |
| |
| -j:: |
| --branch-filter:: |
| Enable taken branch stack sampling. Each sample captures a series of consecutive |
| taken branches. The number of branches captured with each sample depends on the |
| underlying hardware, the type of branches of interest, and the executed code. |
| It is possible to select the types of branches captured by enabling filters. The |
| following filters are defined: |
| |
| - any: any type of branches |
| - any_call: any function call or system call |
| - any_ret: any function return or system call return |
| - ind_call: any indirect branch |
| - u: only when the branch target is at the user level |
| - k: only when the branch target is in the kernel |
| - hv: only when the target is at the hypervisor level |
| - in_tx: only when the target is in a hardware transaction |
| - no_tx: only when the target is not in a hardware transaction |
| - abort_tx: only when the target is a hardware transaction abort |
| |
| + |
| The option requires at least one branch type among any, any_call, any_ret, ind_call. |
| The privilege levels may be omitted, in which case, the privilege levels of the associated |
| event are applied to the branch filter. Both kernel (k) and hypervisor (hv) privilege |
| levels are subject to permissions. When sampling on multiple events, branch stack sampling |
| is enabled for all the sampling events. The sampled branch type is the same for all events. |
| The various filters must be specified as a comma separated list: --branch-filter any_ret,u,k |
| Note that this feature may not be available on all processors. |
| |
| --weight:: |
| Enable weightened sampling. An additional weight is recorded per sample and can be |
| displayed with the weight and local_weight sort keys. This currently works for TSX |
| abort events and some memory events in precise mode on modern Intel CPUs. |
| |
| --transaction:: |
| Record transaction flags for transaction related events. |
| |
| --per-thread:: |
| Use per-thread mmaps. By default per-cpu mmaps are created. This option |
| overrides that and uses per-thread mmaps. A side-effect of that is that |
| inheritance is automatically disabled. --per-thread is ignored with a warning |
| if combined with -a or -C options. |
| |
| -D:: |
| --delay=:: |
| After starting the program, wait msecs before measuring. This is useful to |
| filter out the startup phase of the program, which is often very different. |
| |
| SEE ALSO |
| -------- |
| linkperf:perf-stat[1], linkperf:perf-list[1] |
