Lines Matching refs:counter

13 hardware capabilities. It provides per task and per CPU counters, counter
19 There's one file descriptor per virtual counter used.
29 VFS system calls: read() can be used to read the counter, fcntl()
35 When creating a new counter fd, 'perf_event_attr' is:
40          * specific (raw) counter configuration data, if unset, the next
71 The 'config' field specifies what the counter should count.  It
78 If 'raw_type' is 1, then the counter will count a hardware event
82 If 'raw_type' is 0, then the 'type' field says what kind of counter
91 A counter of PERF_TYPE_HARDWARE will count the hardware event
95  * Generalized performance counter event types, used by the hw_event.event_id
123 A counter of type PERF_TYPE_SOFTWARE will count one of the available
150 counters.  A "counting" counter is one that is used for counting the
155 A read() on a counter returns the current value of the counter and possible
161  * reads on the counter should return the indicated quantities,
162  * in increasing order of bit value, after the counter value.
170 particular counter allowing one to take the round-robin scheduling effect
174 A "sampling" counter is one that is set up to generate an interrupt
175 every N events, where N is given by 'irq_period'.  A sampling counter
195 The 'disabled' bit specifies whether the counter starts out disabled
199 The 'inherit' bit, if set, specifies that this counter should count
202 time the counter is created (nor to any new descendents of existing
205 The 'pinned' bit, if set, specifies that the counter should always be
207 and only to group leaders.  If a pinned counter cannot be put onto the
209 a conflict with some other event), then the counter goes into an
211 until the counter is subsequently enabled or disabled.
213 The 'exclusive' bit, if set, specifies that when this counter's group
238 counter to be specific to a task:
240  pid == 0: if the pid parameter is zero, the counter is attached to the
243  pid > 0: the counter is attached to a specific task (if the current task
248 The 'cpu' parameter allows a counter to be made specific to a CPU:
250  cpu >= 0: the counter is restricted to a specific CPU
251  cpu == -1: the counter counts on all CPUs
255 A 'pid > 0' and 'cpu == -1' counter is a per task counter that counts
260 A 'pid == -1' and 'cpu == x' counter is a per CPU counter that counts
265 The 'group_fd' parameter allows counter "groups" to be set up.  A
266 counter group has one counter which is the group "leader".  The leader
270 (A single counter on its own is created with group_fd = -1 and is
273 A counter group is scheduled onto the CPU as a unit, that is, it will
281 Like stated, asynchronous events, like counter overflow or PROT_EXEC mmap
319         __u32   index;                  /* hardware counter identifier */
320         __s64   offset;                 /* add to hardware counter value */
331 NOTE: the hw-counter userspace bits are arch specific and are currently only
407 so many counter overflow events.
413 prctl.  When a counter is disabled, it doesn't count or generate
416 An individual counter can be enabled with
424 For a counter group, pass PERF_IOC_FLAG_GROUP as the third argument.
428 group other than the leader only affects that counter - disabling an
429 non-leader stops that counter from counting but doesn't affect any
430 other counter.
436 to enable a counter for 'nr' events, after which it gets disabled again.
438 A process can enable or disable all the counter groups that are