There is no good reason why we cannot synthesize "cycle" events from
Intel PT just as we can synthesize "instruction" events, in particular
when CYC packets are available. This enables using PT to getting much
more accurate cycle profiles than regular sampling (record -e cycles)
when the work last for very short periods (<10 ms). Thus, add support
for this, based off of the existing IPC calculation framework. The new
option to --itrace is "y" (for cYcles), as c was taken for calls. Cycle
and instruction events can be synthesized together, and are by default.
The only real caveat is that CYC packets are only emitted whenever some
other packet is, which in practice is when a branch instruction is
encountered (and not even all branches). Thus, even at no subsampling
(e.g. --itrace=y0ns), it is impossible to get more accuracy than a
single basic block, and all cycles spent executing that block will get
attributed to the branch instruction that ends the packet. Thus, one
cannot know whether the cycles came from e.g. a specific load, a
mispredicted branch, or something else. When subsampling (which is the
default), the cycle events will get smeared out even more, but will
still be generally useful to attribute cycle counts to functions.
Reviewed-by: Adrian Hunter <adrian.hunter@intel.com>
Signed-off-by: Steinar H. Gunderson <sesse@google.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: https://lore.kernel.org/r/20220322082452.1429091-1-sesse@google.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
i synthesize instructions events
+ y synthesize cycles events
b synthesize branches events (branch misses for Arm SPE)
c synthesize branches events (calls only)
r synthesize branches events (returns only)
A approximate IPC
Z prefer to ignore timestamps (so-called "timeless" decoding)
- The default is all events i.e. the same as --itrace=ibxwpe,
+ The default is all events i.e. the same as --itrace=iybxwpe,
except for perf script where it is --itrace=ce
In addition, the period (default 100000, except for perf script where it is 1)
options, which will list all the samples.
perf record -e intel_pt//u ls
- perf script --itrace=ibxwpe
+ perf script --itrace=iybxwpe
An interesting field that is not printed by default is 'flags' which can be
displayed as follows:
- perf script --itrace=ibxwpe -F+flags
+ perf script --itrace=iybxwpe -F+flags
The flags are "bcrosyiABExghDt" which stand for branch, call, return, conditional,
system, asynchronous, interrupt, transaction abort, trace begin, trace end,
There are two ways that instructions-per-cycle (IPC) can be calculated depending
on the recording.
-If the 'cyc' config term (see config terms section below) was used, then IPC is
-calculated using the cycle count from CYC packets, otherwise MTC packets are
-used - refer to the 'mtc' config term. When MTC is used, however, the values
-are less accurate because the timing is less accurate.
+If the 'cyc' config term (see config terms section below) was used, then IPC
+and cycle events are calculated using the cycle count from CYC packets, otherwise
+MTC packets are used - refer to the 'mtc' config term. When MTC is used, however,
+the values are less accurate because the timing is less accurate.
Because Intel PT does not update the cycle count on every branch or instruction,
the values will often be zero. When there are values, they will be the number
of instructions and number of cycles since the last update, and thus represent
-the average IPC since the last IPC for that event type. Note IPC for "branches"
-events is calculated separately from IPC for "instructions" events.
+the average IPC cycle count since the last IPC for that event type.
+Note IPC for "branches" events is calculated separately from IPC for "instructions"
+events.
Even with the 'cyc' config term, it is possible to produce IPC information for
every change of timestamp, but at the expense of accuracy. That is selected by
which, in turn, is the same as
- --itrace=cepwx
+ --itrace=cepwxy
The letters are:
i synthesize "instructions" events
+ y synthesize "cycles" events
b synthesize "branches" events
x synthesize "transactions" events
w synthesize "ptwrite" events
"Instructions" events look like they were recorded by "perf record -e
instructions".
+"Cycles" events look like they were recorded by "perf record -e cycles"
+(ie., the default). Note that even with CYC packets enabled and no sampling,
+these are not fully accurate, since CYC packets are not emitted for each
+instruction, only when some other event (like an indirect branch, or a
+TNT packet representing multiple branches) happens causes a packet to
+be emitted. Thus, it is more effective for attributing cycles to functions
+(and possibly basic blocks) than to individual instructions, although it
+is not even perfect for functions (although it becomes better if the noretcomp
+option is active).
+
"Branches" events look like they were recorded by "perf record -e branches". "c"
and "r" can be combined to get calls and returns.
'flags' field can be used in perf script to determine whether the event is a
transaction start, commit or abort.
-Note that "instructions", "branches" and "transactions" events depend on code
-flow packets which can be disabled by using the config term "branch=0". Refer
-to the config terms section above.
+Note that "instructions", "cycles", "branches" and "transactions" events
+depend on code flow packets which can be disabled by using the config term
+"branch=0". Refer to the config terms section above.
"ptwrite" events record the payload of the ptwrite instruction and whether
"fup_on_ptw" was used. "ptwrite" events depend on PTWRITE packets which are
synth_opts->calls = true;
} else {
synth_opts->instructions = true;
+ synth_opts->cycles = true;
synth_opts->period_type = PERF_ITRACE_DEFAULT_PERIOD_TYPE;
synth_opts->period = PERF_ITRACE_DEFAULT_PERIOD;
}
for (p = str; *p;) {
switch (*p++) {
case 'i':
- synth_opts->instructions = true;
+ case 'y':
+ if (p[-1] == 'y')
+ synth_opts->cycles = true;
+ else
+ synth_opts->instructions = true;
while (*p == ' ' || *p == ',')
p += 1;
if (isdigit(*p)) {
}
}
out:
- if (synth_opts->instructions) {
+ if (synth_opts->instructions || synth_opts->cycles) {
if (!period_type_set)
synth_opts->period_type =
PERF_ITRACE_DEFAULT_PERIOD_TYPE;
* @inject: indicates the event (not just the sample) must be fully synthesized
* because 'perf inject' will write it out
* @instructions: whether to synthesize 'instructions' events
+ * @cycles: whether to synthesize 'cycles' events
+ * (not fully accurate, since CYC packets are only emitted
+ * together with other events, such as branches)
* @branches: whether to synthesize 'branches' events
* (branch misses only for Arm SPE)
* @transactions: whether to synthesize events for transactions
bool default_no_sample;
bool inject;
bool instructions;
+ bool cycles;
bool branches;
bool transactions;
bool ptwrites;
#define ITRACE_HELP \
" i[period]: synthesize instructions events\n" \
+" y[period]: synthesize cycles events (same period as i)\n" \
" b: synthesize branches events (branch misses for Arm SPE)\n" \
" c: synthesize branches events (calls only)\n" \
" r: synthesize branches events (returns only)\n" \
" A: approximate IPC\n" \
" Z: prefer to ignore timestamps (so-called \"timeless\" decoding)\n" \
" PERIOD[ns|us|ms|i|t]: specify period to sample stream\n" \
-" concatenate multiple options. Default is ibxwpe or cewp\n"
+" concatenate multiple options. Default is iybxwpe or cewp\n"
static inline
void itrace_synth_opts__set_time_range(struct itrace_synth_opts *opts,
*/
#include <inttypes.h>
+#include <linux/perf_event.h>
#include <stdio.h>
#include <stdbool.h>
#include <errno.h>
u64 instructions_sample_type;
u64 instructions_id;
+ bool sample_cycles;
+ u64 cycles_sample_type;
+ u64 cycles_id;
+
bool sample_branches;
u32 branches_filter;
u64 branches_sample_type;
u64 ipc_cyc_cnt;
u64 last_in_insn_cnt;
u64 last_in_cyc_cnt;
+ u64 last_cy_insn_cnt;
+ u64 last_cy_cyc_cnt;
u64 last_br_insn_cnt;
u64 last_br_cyc_cnt;
unsigned int cbr_seen;
if (pt->filts.cnt > 0)
params.pgd_ip = intel_pt_pgd_ip;
- if (pt->synth_opts.instructions) {
+ if (pt->synth_opts.instructions || pt->synth_opts.cycles) {
if (pt->synth_opts.period) {
switch (pt->synth_opts.period_type) {
case PERF_ITRACE_PERIOD_INSTRUCTIONS:
pt->instructions_sample_type);
}
+static int intel_pt_synth_cycle_sample(struct intel_pt_queue *ptq)
+{
+ struct intel_pt *pt = ptq->pt;
+ union perf_event *event = ptq->event_buf;
+ struct perf_sample sample = { .ip = 0, };
+ u64 period = 0;
+
+ if (ptq->sample_ipc)
+ period = ptq->ipc_cyc_cnt - ptq->last_cy_cyc_cnt;
+
+ if (!period || intel_pt_skip_event(pt))
+ return 0;
+
+ intel_pt_prep_sample(pt, ptq, event, &sample);
+
+ sample.id = ptq->pt->cycles_id;
+ sample.stream_id = ptq->pt->cycles_id;
+ sample.period = period;
+
+ sample.cyc_cnt = period;
+ sample.insn_cnt = ptq->ipc_insn_cnt - ptq->last_cy_insn_cnt;
+ ptq->last_cy_insn_cnt = ptq->ipc_insn_cnt;
+ ptq->last_cy_cyc_cnt = ptq->ipc_cyc_cnt;
+
+ return intel_pt_deliver_synth_event(pt, event, &sample, pt->cycles_sample_type);
+}
+
static int intel_pt_synth_transaction_sample(struct intel_pt_queue *ptq)
{
struct intel_pt *pt = ptq->pt;
}
}
- if (pt->sample_instructions && (state->type & INTEL_PT_INSTRUCTION)) {
- err = intel_pt_synth_instruction_sample(ptq);
- if (err)
- return err;
+ if (state->type & INTEL_PT_INSTRUCTION) {
+ if (pt->sample_instructions) {
+ err = intel_pt_synth_instruction_sample(ptq);
+ if (err)
+ return err;
+ }
+ if (pt->sample_cycles) {
+ err = intel_pt_synth_cycle_sample(ptq);
+ if (err)
+ return err;
+ }
}
if (pt->sample_transactions && (state->type & INTEL_PT_TRANSACTION)) {
id += 1;
}
+ if (pt->synth_opts.cycles) {
+ attr.config = PERF_COUNT_HW_CPU_CYCLES;
+ if (pt->synth_opts.period_type == PERF_ITRACE_PERIOD_NANOSECS)
+ attr.sample_period =
+ intel_pt_ns_to_ticks(pt, pt->synth_opts.period);
+ else
+ attr.sample_period = pt->synth_opts.period;
+ err = intel_pt_synth_event(session, "cycles", &attr, id);
+ if (err)
+ return err;
+ pt->sample_cycles = true;
+ pt->cycles_sample_type = attr.sample_type;
+ pt->cycles_id = id;
+ id += 1;
+ }
+
attr.sample_type &= ~(u64)PERF_SAMPLE_PERIOD;
attr.sample_period = 1;
projects / platform / kernel / linux-rpi.git / commitdiff