mirror of https://github.com/mkerrisk/man-pages
perf_event_open.2: srcfix
Signed-off-by: Alejandro Colomar <alx.manpages@gmail.com> Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
This commit is contained in:
Alejandro Colomar
Michael Kerrisk
parent
17cf67cc72
commit
2b9bf369d1
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@ -126,7 +126,7 @@ The leader is created first, with
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The rest of the group members are created with subsequent
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.BR perf_event_open ()
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calls with
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.IR group_fd
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.I group_fd
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being set to the file descriptor of the group leader.
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(A single event on its own is created with
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.IR group_fd " = \-1"
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@ -162,7 +162,7 @@ then
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.TP
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.BR PERF_FLAG_FD_NO_GROUP
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This flag tells the event to ignore the
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.IR group_fd
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.I group_fd
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parameter except for the purpose of setting up output redirection
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using the
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.B PERF_FLAG_FD_OUTPUT
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@ -352,7 +352,11 @@ These two dynamic PMUs create a kprobe/uprobe and attach it to the
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file descriptor generated by perf_event_open.
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The kprobe/uprobe will be destroyed on the destruction of the file descriptor.
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See fields
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.IR kprobe_func ", " uprobe_path ", " kprobe_addr ", and " probe_offset
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.IR kprobe_func ,
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.IR uprobe_path ,
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.IR kprobe_addr ,
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and
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.I probe_offset
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for more details.
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.RE
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.TP
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@ -401,7 +405,9 @@ the
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.I type
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field.
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The
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.IR config1 " and " config2
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.I config1
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and
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.I config2
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fields are also taken into account in cases where 64 bits is not
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enough to fully specify the event.
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The encoding of these fields are event dependent.
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@ -558,15 +564,15 @@ then we are measuring a hardware CPU cache event.
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To calculate the appropriate
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.I config
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value use the following equation:
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.RS 4
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.PP
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.RS 4
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.RS 4
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.in +4n
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.EX
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config = (perf_hw_cache_id) |
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(perf_hw_cache_op_id << 8) |
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(perf_hw_cache_op_result_id << 16);
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.EE
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.RE
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.in
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.PP
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where
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.I perf_hw_cache_id
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@ -652,24 +658,28 @@ Its parameters are set in other places.
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If
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.I type
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is
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.BR kprobe
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.B kprobe
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or
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.BR uprobe ,
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set
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.IR retprobe
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.I retprobe
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(bit 0 of
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.IR config ,
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see
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.IR /sys/bus/event_source/devices/[k,u]probe/format/retprobe )
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for kretprobe/uretprobe.
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See fields
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.IR kprobe_func ", " uprobe_path ", " kprobe_addr ", and " probe_offset
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.IR kprobe_func ,
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.IR uprobe_path ,
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.IR kprobe_addr ,
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and
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.I probe_offset
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for more details.
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.RE
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.TP
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.IR kprobe_func ", " uprobe_path ", " kprobe_addr ", and " probe_offset
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These fields describe the kprobe/uprobe for dynamic PMUs
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.BR kprobe
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.B kprobe
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and
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.BR uprobe .
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For
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@ -712,7 +722,7 @@ to try and achieve the desired rate.
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The rate of adjustment is a
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timer tick.
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.TP
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.I "sample_type"
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.I sample_type
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The various bits in this field specify which values to include
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in the sample.
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They will be recorded in a ring-buffer,
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@ -859,7 +869,7 @@ hardware at the time of the sampled
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instruction's retirement.
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.RE
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.TP
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.IR "read_format"
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.I read_format
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This field specifies the format of the data returned by
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.BR read (2)
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on a
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@ -888,7 +898,7 @@ Adds a 64-bit unique value that corresponds to the event group.
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Allows all counter values in an event group to be read with one read.
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.RE
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.TP
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.IR "disabled"
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.I disabled
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The
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.I disabled
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bit specifies whether the counter starts out disabled or enabled.
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@ -909,7 +919,7 @@ Despite
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being 0, the child events will not start until the group leader
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is enabled.
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.TP
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.IR "inherit"
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.I inherit
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The
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.I inherit
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bit specifies that this counter should count events of child
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@ -923,7 +933,7 @@ Inherit does not work for some combinations of
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values, such as
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.BR PERF_FORMAT_GROUP .
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.TP
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.IR "pinned"
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.I pinned
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The
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.I pinned
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bit specifies that the counter should always be on the CPU if at all
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@ -936,7 +946,7 @@ return end-of-file (i.e.,
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.BR read (2)
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returns 0) until the counter is subsequently enabled or disabled.
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.TP
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.IR "exclusive"
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.I exclusive
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The
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.I exclusive
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bit specifies that when this counter's group is on the CPU,
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@ -952,13 +962,13 @@ This includes any users running a system-wide
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measurement as well as any kernel use of the performance counters
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(including the commonly enabled NMI Watchdog Timer interface).
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.TP
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.IR "exclude_user"
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.I exclude_user
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If this bit is set, the count excludes events that happen in user space.
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.TP
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.IR "exclude_kernel"
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.I exclude_kernel
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If this bit is set, the count excludes events that happen in kernel space.
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.TP
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.IR "exclude_hv"
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.I exclude_hv
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If this bit is set, the count excludes events that happen in the
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hypervisor.
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This is mainly for PMUs that have built-in support for handling this
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@ -966,12 +976,12 @@ This is mainly for PMUs that have built-in support for handling this
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Extra support is needed for handling hypervisor measurements on most
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machines.
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.TP
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.IR "exclude_idle"
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.I exclude_idle
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If set, don't count when the CPU is running the idle task.
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While you can currently enable this for any event type, it is ignored
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for all but software events.
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.TP
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.IR "mmap"
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.I mmap
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The
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.I mmap
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bit enables generation of
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@ -985,7 +995,7 @@ This allows tools to notice new executable code being mapped into
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a program (dynamic shared libraries for example)
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so that addresses can be mapped back to the original code.
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.TP
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.IR "comm"
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.I comm
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The
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.I comm
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bit enables tracking of process command name as modified by the
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@ -1004,30 +1014,30 @@ can be used to differentiate the
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.BR exec (2)
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case from the others.
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.TP
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.IR "freq"
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.I freq
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If this bit is set, then
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.I sample_frequency
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not
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.I sample_period
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is used when setting up the sampling interval.
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.TP
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.IR "inherit_stat"
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.I inherit_stat
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This bit enables saving of event counts on context switch for
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inherited tasks.
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This is meaningful only if the
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.I inherit
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field is set.
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.TP
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.IR "enable_on_exec"
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.I enable_on_exec
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If this bit is set, a counter is automatically
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enabled after a call to
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.BR exec (2).
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.TP
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.IR "task"
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.I task
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If this bit is set, then
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fork/exit notifications are included in the ring buffer.
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.TP
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.IR "watermark"
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.I watermark
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If set, have an overflow notification happen when we cross the
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.I wakeup_watermark
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boundary.
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@ -1035,7 +1045,7 @@ Otherwise, overflow notifications happen after
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.I wakeup_events
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samples.
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.TP
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.IR "precise_ip" " (since Linux 2.6.35)"
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.IR precise_ip " (since Linux 2.6.35)"
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.\" commit ab608344bcbde4f55ec4cd911b686b0ce3eae076
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This controls the amount of skid.
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Skid is how many instructions
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@ -1064,7 +1074,7 @@ See also the description of
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.BR PERF_RECORD_MISC_EXACT_IP .
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.RE
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.TP
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.IR "mmap_data" " (since Linux 2.6.36)"
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.IR mmap_data " (since Linux 2.6.36)"
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.\" commit 3af9e859281bda7eb7c20b51879cf43aa788ac2e
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This is the counterpart of the
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.I mmap
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@ -1077,7 +1087,7 @@ calls that do not have
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.B PROT_EXEC
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set (for example data and SysV shared memory).
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.TP
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.IR "sample_id_all" " (since Linux 2.6.38)"
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.IR sample_id_all " (since Linux 2.6.38)"
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.\" commit c980d1091810df13f21aabbce545fd98f545bbf7
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If set, then TID, TIME, ID, STREAM_ID, and CPU can
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additionally be included in
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@ -1109,7 +1119,7 @@ struct sample_id {
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.EE
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.in
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.TP
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.IR "exclude_host" " (since Linux 3.2)"
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.IR exclude_host " (since Linux 3.2)"
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.\" commit a240f76165e6255384d4bdb8139895fac7988799
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When conducting measurements that include processes running
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VM instances (i.e., have executed a
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@ -1120,7 +1130,7 @@ This is only meaningful outside the guests; this setting does
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not change counts gathered inside of a guest.
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Currently, this functionality is x86 only.
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.TP
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.IR "exclude_guest" " (since Linux 3.2)"
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.IR exclude_guest " (since Linux 3.2)"
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.\" commit a240f76165e6255384d4bdb8139895fac7988799
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When conducting measurements that include processes running
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VM instances (i.e., have executed a
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@ -1131,15 +1141,15 @@ This is only meaningful outside the guests; this setting does
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not change counts gathered inside of a guest.
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Currently, this functionality is x86 only.
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.TP
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.IR "exclude_callchain_kernel" " (since Linux 3.7)"
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.IR exclude_callchain_kernel " (since Linux 3.7)"
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.\" commit d077526485d5c9b12fe85d0b2b3b7041e6bc5f91
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Do not include kernel callchains.
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.TP
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.IR "exclude_callchain_user" " (since Linux 3.7)"
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.IR exclude_callchain_user " (since Linux 3.7)"
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.\" commit d077526485d5c9b12fe85d0b2b3b7041e6bc5f91
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Do not include user callchains.
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.TP
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.IR "mmap2" " (since Linux 3.16)"
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.IR mmap2 " (since Linux 3.16)"
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.\" commit 13d7a2410fa637f450a29ecb515ac318ee40c741
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.\" This is tricky; was committed during 3.12 development
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.\" but right before release was disabled.
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@ -1152,7 +1162,7 @@ The
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.I mmap
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flag must also be set for this to work.
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.TP
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.IR "comm_exec" " (since Linux 3.16)"
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.IR comm_exec " (since Linux 3.16)"
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.\" commit 82b897782d10fcc4930c9d4a15b175348fdd2871
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This is purely a feature-detection flag, it does not change
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kernel behavior.
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@ -1168,7 +1178,7 @@ reported was caused by a call to
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This allows tools to distinguish between the various
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types of process renaming.
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.TP
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.IR "use_clockid" " (since Linux 4.1)"
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.IR use_clockid " (since Linux 4.1)"
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.\" commit 34f439278cef7b1177f8ce24f9fc81dfc6221d3b
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This allows selecting which internal Linux clock to use
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when generating timestamps via the
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@ -1177,7 +1187,7 @@ field.
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This can make it easier to correlate perf sample times with
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timestamps generated by other tools.
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.TP
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.IR "context_switch" " (since Linux 4.3)"
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.IR context_switch " (since Linux 4.3)"
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.\" commit 45ac1403f564f411c6a383a2448688ba8dd705a4
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This enables the generation of
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.B PERF_RECORD_SWITCH
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@ -1192,7 +1202,7 @@ information even with strict
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.I perf_event_paranoid
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settings.
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.TP
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.IR "wakeup_events" ", " "wakeup_watermark"
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.IR wakeup_events ", " wakeup_watermark
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This union sets how many samples
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.RI ( wakeup_events )
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or bytes
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@ -1218,25 +1228,25 @@ Prior to Linux 3.0, setting
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to 0 resulted in no overflow notifications;
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more recent kernels treat 0 the same as 1.
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.TP
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.IR "bp_type" " (since Linux 2.6.33)"
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.IR bp_type " (since Linux 2.6.33)"
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.\" commit 24f1e32c60c45c89a997c73395b69c8af6f0a84e
|
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This chooses the breakpoint type.
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It is one of:
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.RS
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.TP
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.BR HW_BREAKPOINT_EMPTY
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.B HW_BREAKPOINT_EMPTY
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No breakpoint.
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.TP
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.BR HW_BREAKPOINT_R
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.B HW_BREAKPOINT_R
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Count when we read the memory location.
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.TP
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.BR HW_BREAKPOINT_W
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.B HW_BREAKPOINT_W
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Count when we write the memory location.
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.TP
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.BR HW_BREAKPOINT_RW
|
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.B HW_BREAKPOINT_RW
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Count when we read or write the memory location.
|
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.TP
|
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.BR HW_BREAKPOINT_X
|
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.B HW_BREAKPOINT_X
|
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Count when we execute code at the memory location.
|
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.PP
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The values can be combined via a bitwise or, but the
|
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|
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@ -1249,14 +1259,14 @@ with
|
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is not allowed.
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.RE
|
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.TP
|
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.IR "bp_addr" " (since Linux 2.6.33)"
|
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.IR bp_addr " (since Linux 2.6.33)"
|
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.\" commit 24f1e32c60c45c89a997c73395b69c8af6f0a84e
|
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This is the address of the breakpoint.
|
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For execution breakpoints, this is the memory address of the instruction
|
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of interest; for read and write breakpoints, it is the memory address
|
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of the memory location of interest.
|
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.TP
|
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.IR "config1" " (since Linux 2.6.39)"
|
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.IR config1 " (since Linux 2.6.39)"
|
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.\" commit a7e3ed1e470116c9d12c2f778431a481a6be8ab6
|
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.I config1
|
||||
is used for setting events that need an extra register or otherwise
|
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|
|
@ -1264,7 +1274,7 @@ do not fit in the regular config field.
|
|||
Raw OFFCORE_EVENTS on Nehalem/Westmere/SandyBridge use this field
|
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on Linux 3.3 and later kernels.
|
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.TP
|
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.IR "bp_len" " (since Linux 2.6.33)"
|
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.IR bp_len " (since Linux 2.6.33)"
|
||||
.\" commit 24f1e32c60c45c89a997c73395b69c8af6f0a84e
|
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.I bp_len
|
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is the length of the breakpoint being measured if
|
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|
|
@ -1280,14 +1290,14 @@ and
|
|||
For an execution breakpoint, set this to
|
||||
.IR sizeof(long) .
|
||||
.TP
|
||||
.IR "config2" " (since Linux 2.6.39)"
|
||||
.IR config2 " (since Linux 2.6.39)"
|
||||
.\" commit a7e3ed1e470116c9d12c2f778431a481a6be8ab6
|
||||
.I config2
|
||||
is a further extension of the
|
||||
.I config1
|
||||
field.
|
||||
.TP
|
||||
.IR "branch_sample_type" " (since Linux 3.4)"
|
||||
.IR branch_sample_type " (since Linux 3.4)"
|
||||
.\" commit bce38cd53e5ddba9cb6d708c4ef3d04a4016ec7e
|
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If
|
||||
.B PERF_SAMPLE_BRANCH_STACK
|
||||
|
|
@ -1358,20 +1368,20 @@ This requires hardware support, currently only found
|
|||
on Intel x86 Haswell or newer.
|
||||
.RE
|
||||
.TP
|
||||
.IR "sample_regs_user" " (since Linux 3.7)"
|
||||
.IR sample_regs_user " (since Linux 3.7)"
|
||||
.\" commit 4018994f3d8785275ef0e7391b75c3462c029e56
|
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This bit mask defines the set of user CPU registers to dump on samples.
|
||||
The layout of the register mask is architecture-specific and
|
||||
is described in the kernel header file
|
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.IR arch/ARCH/include/uapi/asm/perf_regs.h .
|
||||
.TP
|
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.IR "sample_stack_user" " (since Linux 3.7)"
|
||||
.IR sample_stack_user " (since Linux 3.7)"
|
||||
.\" commit c5ebcedb566ef17bda7b02686e0d658a7bb42ee7
|
||||
This defines the size of the user stack to dump if
|
||||
.B PERF_SAMPLE_STACK_USER
|
||||
is specified.
|
||||
.TP
|
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.IR "clockid" " (since Linux 4.1)"
|
||||
.IR clockid " (since Linux 4.1)"
|
||||
.\" commit 34f439278cef7b1177f8ce24f9fc81dfc6221d3b
|
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If
|
||||
.I use_clockid
|
||||
|
|
@ -1388,13 +1398,13 @@ and
|
|||
.B CLOCK_TAI
|
||||
currently supported.
|
||||
.TP
|
||||
.IR "aux_watermark" " (since Linux 4.1)"
|
||||
.IR aux_watermark " (since Linux 4.1)"
|
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.\" commit 1a5941312414c71dece6717da9a0fa1303127afa
|
||||
This specifies how much data is required to trigger a
|
||||
.B PERF_RECORD_AUX
|
||||
sample.
|
||||
.TP
|
||||
.IR "sample_max_stack" " (since Linux 4.8)"
|
||||
.IR sample_max_stack " (since Linux 4.8)"
|
||||
.\" commit 97c79a38cd454602645f0470ffb444b3b75ce574
|
||||
When
|
||||
.I sample_type
|
||||
|
|
@ -1682,34 +1692,39 @@ delta since
|
|||
.I time_enabled
|
||||
(in nanoseconds) using rdtsc or similar.
|
||||
.IP
|
||||
.nf
|
||||
u64 quot, rem;
|
||||
u64 delta;
|
||||
quot = (cyc >> time_shift);
|
||||
rem = cyc & (((u64)1 << time_shift) \- 1);
|
||||
delta = time_offset + quot * time_mult +
|
||||
((rem * time_mult) >> time_shift);
|
||||
.fi
|
||||
.in +4n
|
||||
.EX
|
||||
u64 quot, rem;
|
||||
u64 delta;
|
||||
|
||||
quot = cyc >> time_shift;
|
||||
rem = cyc & (((u64)1 << time_shift) \- 1);
|
||||
delta = time_offset + quot * time_mult +
|
||||
((rem * time_mult) >> time_shift);
|
||||
.EE
|
||||
.in
|
||||
.IP
|
||||
Where
|
||||
.IR time_offset ,
|
||||
.IR time_mult ,
|
||||
.IR time_shift ,
|
||||
and
|
||||
.IR cyc
|
||||
.I cyc
|
||||
are read in the
|
||||
seqcount loop described above.
|
||||
This delta can then be added to
|
||||
enabled and possible running (if idx), improving the scaling:
|
||||
.IP
|
||||
.nf
|
||||
enabled += delta;
|
||||
if (idx)
|
||||
running += delta;
|
||||
quot = count / running;
|
||||
rem = count % running;
|
||||
count = quot * enabled + (rem * enabled) / running;
|
||||
.fi
|
||||
.in +4n
|
||||
.EX
|
||||
enabled += delta;
|
||||
if (idx)
|
||||
running += delta;
|
||||
quot = count / running;
|
||||
rem = count % running;
|
||||
count = quot * enabled + (rem * enabled) / running;
|
||||
.EE
|
||||
.in
|
||||
.TP
|
||||
.IR time_zero " (since Linux 3.12)"
|
||||
.\" commit fa7315871046b9a4c48627905691dbde57e51033
|
||||
|
|
@ -1718,23 +1733,31 @@ If
|
|||
.I cap_usr_time_zero
|
||||
is set, then the hardware clock (the TSC timestamp counter on x86)
|
||||
can be calculated from the
|
||||
.IR time_zero ", " time_mult ", and " time_shift " values:"
|
||||
.IR time_zero ,
|
||||
.IR time_mult ,
|
||||
and
|
||||
.I time_shift
|
||||
values:
|
||||
.IP
|
||||
.nf
|
||||
time = timestamp - time_zero;
|
||||
quot = time / time_mult;
|
||||
rem = time % time_mult;
|
||||
cyc = (quot << time_shift) + (rem << time_shift) / time_mult;
|
||||
.fi
|
||||
.in +4n
|
||||
.EX
|
||||
time = timestamp - time_zero;
|
||||
quot = time / time_mult;
|
||||
rem = time % time_mult;
|
||||
cyc = (quot << time_shift) + (rem << time_shift) / time_mult;
|
||||
.EE
|
||||
.in
|
||||
.IP
|
||||
And vice versa:
|
||||
.IP
|
||||
.nf
|
||||
quot = cyc >> time_shift;
|
||||
rem = cyc & (((u64)1 << time_shift) - 1);
|
||||
timestamp = time_zero + quot * time_mult +
|
||||
((rem * time_mult) >> time_shift);
|
||||
.fi
|
||||
.in +4n
|
||||
.EX
|
||||
quot = cyc >> time_shift;
|
||||
rem = cyc & (((u64)1 << time_shift) - 1);
|
||||
timestamp = time_zero + quot * time_mult +
|
||||
((rem * time_mult) >> time_shift);
|
||||
.EE
|
||||
.in
|
||||
.TP
|
||||
.I data_head
|
||||
This points to the head of the data section.
|
||||
|
|
@ -1785,7 +1808,7 @@ The desired offset and size must be page aligned, and the size
|
|||
must be a power of two.
|
||||
These values are then passed to mmap in order to map the AUX buffer.
|
||||
Pages in the AUX buffer are included as part of the
|
||||
.BR RLIMIT_MEMLOCK
|
||||
.B RLIMIT_MEMLOCK
|
||||
resource limit (see
|
||||
.BR setrlimit (2)),
|
||||
and also as part of the
|
||||
|
|
@ -1802,10 +1825,14 @@ new data began, and it is the consumer's job to disable
|
|||
measurement while reading to avoid possible data races.
|
||||
.IP
|
||||
The
|
||||
.IR aux_head " and " aux_tail
|
||||
.I aux_head
|
||||
and
|
||||
.I aux_tail
|
||||
ring buffer pointers have the same behavior and ordering
|
||||
rules as the previous described
|
||||
.IR data_head " and " data_tail .
|
||||
.I data_head
|
||||
and
|
||||
.IR data_tail .
|
||||
.PP
|
||||
The following 2^n ring-buffer pages have the layout described below.
|
||||
.PP
|
||||
|
|
@ -1897,9 +1924,9 @@ system call.
|
|||
.BR PERF_RECORD_MISC_SWITCH_OUT " (since Linux 4.3)"
|
||||
.\" commit 45ac1403f564f411c6a383a2448688ba8dd705a4
|
||||
When a
|
||||
.BR PERF_RECORD_SWITCH
|
||||
.B PERF_RECORD_SWITCH
|
||||
or
|
||||
.BR PERF_RECORD_SWITCH_CPU_WIDE
|
||||
.B PERF_RECORD_SWITCH_CPU_WIDE
|
||||
record is generated, this bit indicates that the
|
||||
context switch is away from the current process
|
||||
(instead of into the current process).
|
||||
|
|
@ -2267,7 +2294,7 @@ Support for
|
|||
.IR mispred ,
|
||||
.IR predicted ,
|
||||
and
|
||||
.IR cycles
|
||||
.I cycles
|
||||
is optional; if not supported, those
|
||||
values will be 0.
|
||||
.PP
|
||||
|
|
@ -2284,7 +2311,9 @@ is enabled, then the user CPU registers are recorded.
|
|||
The
|
||||
.I abi
|
||||
field is one of
|
||||
.BR PERF_SAMPLE_REGS_ABI_NONE ", " PERF_SAMPLE_REGS_ABI_32 " or"
|
||||
.BR PERF_SAMPLE_REGS_ABI_NONE ,
|
||||
.BR PERF_SAMPLE_REGS_ABI_32 ,
|
||||
or
|
||||
.BR PERF_SAMPLE_REGS_ABI_64 .
|
||||
.IP
|
||||
The
|
||||
|
|
|
|||
Loading…
Reference in New Issue