perf intel-pt: Add support for decoding FUP/TIP only
Use the new itrace 'q' option to add support for a mode of decoding that ignores TNT, does not walk object code, but gets the ip from FUP and TIP packets. Example: $ perf record -e intel_pt//u grep -rI pudding drivers [ perf record: Woken up 52 times to write data ] [ perf record: Captured and wrote 57.870 MB perf.data ] $ time perf script --itrace=bi | wc -l 58948289 real 1m23.863s user 1m23.251s sys 0m7.452s $ time perf script --itrace=biq | wc -l 3385694 real 0m4.453s user 0m4.455s sys 0m0.328s Signed-off-by: Adrian Hunter <adrian.hunter@intel.com> Reviewed-by: Andi Kleen <ak@linux.intel.com> Tested-by: Arnaldo Carvalho de Melo <acme@redhat.com> Cc: Jiri Olsa <jolsa@redhat.com> Link: http://lore.kernel.org/lkml/20200710151104.15137-12-adrian.hunter@intel.com Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Adrian Hunter
Arnaldo Carvalho de Melo
parent
51971536ef
commit
7c1b16ba0e
|
|
@ -825,6 +825,7 @@ The letters are:
|
|||
l synthesize last branch entries (use with i or x)
|
||||
L synthesize last branch entries on existing event records
|
||||
s skip initial number of events
|
||||
q quicker (less detailed) decoding
|
||||
|
||||
"Instructions" events look like they were recorded by "perf record -e
|
||||
instructions".
|
||||
|
|
@ -969,6 +970,36 @@ at the beginning. This is useful to ignore initialization code.
|
|||
|
||||
skips the first million instructions.
|
||||
|
||||
The q option changes the way the trace is decoded. The decoding is much faster
|
||||
but much less detailed. Specifically, with the q option, the decoder does not
|
||||
decode TNT packets, and does not walk object code, but gets the ip from FUP and
|
||||
TIP packets. The q option can be used with the b and i options but the period
|
||||
is not used. The q option decodes more quickly, but is useful only if the
|
||||
control flow of interest is represented or indicated by FUP, TIP, TIP.PGE, or
|
||||
TIP.PGD packets (refer below). However the q option could be used to find time
|
||||
ranges that could then be decoded fully using the --time option.
|
||||
|
||||
What will *not* be decoded with the (single) q option:
|
||||
|
||||
- direct calls and jmps
|
||||
- conditional branches
|
||||
- non-branch instructions
|
||||
|
||||
What *will* be decoded with the (single) q option:
|
||||
|
||||
- asynchronous branches such as interrupts
|
||||
- indirect branches
|
||||
- function return target address *if* the noretcomp config term (refer
|
||||
config terms section) was used
|
||||
- start of (control-flow) tracing
|
||||
- end of (control-flow) tracing, if it is not out of context
|
||||
- power events, ptwrite, transaction start and abort
|
||||
- instruction pointer associated with PSB packets
|
||||
|
||||
Note the q option does not specify what events will be synthesized e.g. the p
|
||||
option must be used also to show power events.
|
||||
|
||||
|
||||
dump option
|
||||
~~~~~~~~~~~
|
||||
|
||||
|
|
|
|||
|
|
@ -55,6 +55,7 @@ enum intel_pt_pkt_state {
|
|||
INTEL_PT_STATE_TIP_PGD,
|
||||
INTEL_PT_STATE_FUP,
|
||||
INTEL_PT_STATE_FUP_NO_TIP,
|
||||
INTEL_PT_STATE_RESAMPLE,
|
||||
};
|
||||
|
||||
static inline bool intel_pt_sample_time(enum intel_pt_pkt_state pkt_state)
|
||||
|
|
@ -65,6 +66,7 @@ static inline bool intel_pt_sample_time(enum intel_pt_pkt_state pkt_state)
|
|||
case INTEL_PT_STATE_ERR_RESYNC:
|
||||
case INTEL_PT_STATE_IN_SYNC:
|
||||
case INTEL_PT_STATE_TNT_CONT:
|
||||
case INTEL_PT_STATE_RESAMPLE:
|
||||
return true;
|
||||
case INTEL_PT_STATE_TNT:
|
||||
case INTEL_PT_STATE_TIP:
|
||||
|
|
@ -109,6 +111,8 @@ struct intel_pt_decoder {
|
|||
bool fixup_last_mtc;
|
||||
bool have_last_ip;
|
||||
bool in_psb;
|
||||
bool hop;
|
||||
bool hop_psb_fup;
|
||||
enum intel_pt_param_flags flags;
|
||||
uint64_t pos;
|
||||
uint64_t last_ip;
|
||||
|
|
@ -235,6 +239,7 @@ struct intel_pt_decoder *intel_pt_decoder_new(struct intel_pt_params *params)
|
|||
decoder->data = params->data;
|
||||
decoder->return_compression = params->return_compression;
|
||||
decoder->branch_enable = params->branch_enable;
|
||||
decoder->hop = params->quick >= 1;
|
||||
|
||||
decoder->flags = params->flags;
|
||||
|
||||
|
|
@ -275,6 +280,9 @@ struct intel_pt_decoder *intel_pt_decoder_new(struct intel_pt_params *params)
|
|||
intel_pt_log("timestamp: tsc_ctc_mult %u\n", decoder->tsc_ctc_mult);
|
||||
intel_pt_log("timestamp: tsc_slip %#x\n", decoder->tsc_slip);
|
||||
|
||||
if (decoder->hop)
|
||||
intel_pt_log("Hop mode: decoding FUP and TIPs, but not TNT\n");
|
||||
|
||||
return decoder;
|
||||
}
|
||||
|
||||
|
|
@ -1730,8 +1738,14 @@ static int intel_pt_walk_psbend(struct intel_pt_decoder *decoder)
|
|||
|
||||
case INTEL_PT_FUP:
|
||||
decoder->pge = true;
|
||||
if (decoder->packet.count)
|
||||
if (decoder->packet.count) {
|
||||
intel_pt_set_last_ip(decoder);
|
||||
if (decoder->hop) {
|
||||
/* Act on FUP at PSBEND */
|
||||
decoder->ip = decoder->last_ip;
|
||||
decoder->hop_psb_fup = true;
|
||||
}
|
||||
}
|
||||
break;
|
||||
|
||||
case INTEL_PT_MODE_TSX:
|
||||
|
|
@ -1875,6 +1889,118 @@ static int intel_pt_walk_fup_tip(struct intel_pt_decoder *decoder)
|
|||
}
|
||||
}
|
||||
|
||||
static int intel_pt_resample(struct intel_pt_decoder *decoder)
|
||||
{
|
||||
decoder->pkt_state = INTEL_PT_STATE_IN_SYNC;
|
||||
decoder->state.type = INTEL_PT_INSTRUCTION;
|
||||
decoder->state.from_ip = decoder->ip;
|
||||
decoder->state.to_ip = 0;
|
||||
return 0;
|
||||
}
|
||||
|
||||
#define HOP_PROCESS 0
|
||||
#define HOP_IGNORE 1
|
||||
#define HOP_RETURN 2
|
||||
#define HOP_AGAIN 3
|
||||
|
||||
/* Hop mode: Ignore TNT, do not walk code, but get ip from FUPs and TIPs */
|
||||
static int intel_pt_hop_trace(struct intel_pt_decoder *decoder, bool *no_tip, int *err)
|
||||
{
|
||||
switch (decoder->packet.type) {
|
||||
case INTEL_PT_TNT:
|
||||
return HOP_IGNORE;
|
||||
|
||||
case INTEL_PT_TIP_PGD:
|
||||
if (!decoder->packet.count)
|
||||
return HOP_IGNORE;
|
||||
intel_pt_set_ip(decoder);
|
||||
decoder->state.type |= INTEL_PT_TRACE_END;
|
||||
decoder->state.from_ip = 0;
|
||||
decoder->state.to_ip = decoder->ip;
|
||||
return HOP_RETURN;
|
||||
|
||||
case INTEL_PT_TIP:
|
||||
if (!decoder->packet.count)
|
||||
return HOP_IGNORE;
|
||||
intel_pt_set_ip(decoder);
|
||||
decoder->state.type = INTEL_PT_INSTRUCTION;
|
||||
decoder->state.from_ip = decoder->ip;
|
||||
decoder->state.to_ip = 0;
|
||||
return HOP_RETURN;
|
||||
|
||||
case INTEL_PT_FUP:
|
||||
if (!decoder->packet.count)
|
||||
return HOP_IGNORE;
|
||||
intel_pt_set_ip(decoder);
|
||||
if (intel_pt_fup_event(decoder))
|
||||
return HOP_RETURN;
|
||||
if (!decoder->branch_enable)
|
||||
*no_tip = true;
|
||||
if (*no_tip) {
|
||||
decoder->state.type = INTEL_PT_INSTRUCTION;
|
||||
decoder->state.from_ip = decoder->ip;
|
||||
decoder->state.to_ip = 0;
|
||||
return HOP_RETURN;
|
||||
}
|
||||
*err = intel_pt_walk_fup_tip(decoder);
|
||||
if (!*err)
|
||||
decoder->pkt_state = INTEL_PT_STATE_RESAMPLE;
|
||||
return HOP_RETURN;
|
||||
|
||||
case INTEL_PT_PSB:
|
||||
decoder->last_ip = 0;
|
||||
decoder->have_last_ip = true;
|
||||
decoder->hop_psb_fup = false;
|
||||
*err = intel_pt_walk_psbend(decoder);
|
||||
if (*err == -EAGAIN)
|
||||
return HOP_AGAIN;
|
||||
if (*err)
|
||||
return HOP_RETURN;
|
||||
if (decoder->hop_psb_fup) {
|
||||
decoder->hop_psb_fup = false;
|
||||
decoder->state.type = INTEL_PT_INSTRUCTION;
|
||||
decoder->state.from_ip = decoder->ip;
|
||||
decoder->state.to_ip = 0;
|
||||
return HOP_RETURN;
|
||||
}
|
||||
if (decoder->cbr != decoder->cbr_seen) {
|
||||
decoder->state.type = 0;
|
||||
return HOP_RETURN;
|
||||
}
|
||||
return HOP_IGNORE;
|
||||
|
||||
case INTEL_PT_BAD:
|
||||
case INTEL_PT_PAD:
|
||||
case INTEL_PT_TIP_PGE:
|
||||
case INTEL_PT_TSC:
|
||||
case INTEL_PT_TMA:
|
||||
case INTEL_PT_MODE_EXEC:
|
||||
case INTEL_PT_MODE_TSX:
|
||||
case INTEL_PT_MTC:
|
||||
case INTEL_PT_CYC:
|
||||
case INTEL_PT_VMCS:
|
||||
case INTEL_PT_PSBEND:
|
||||
case INTEL_PT_CBR:
|
||||
case INTEL_PT_TRACESTOP:
|
||||
case INTEL_PT_PIP:
|
||||
case INTEL_PT_OVF:
|
||||
case INTEL_PT_MNT:
|
||||
case INTEL_PT_PTWRITE:
|
||||
case INTEL_PT_PTWRITE_IP:
|
||||
case INTEL_PT_EXSTOP:
|
||||
case INTEL_PT_EXSTOP_IP:
|
||||
case INTEL_PT_MWAIT:
|
||||
case INTEL_PT_PWRE:
|
||||
case INTEL_PT_PWRX:
|
||||
case INTEL_PT_BBP:
|
||||
case INTEL_PT_BIP:
|
||||
case INTEL_PT_BEP:
|
||||
case INTEL_PT_BEP_IP:
|
||||
default:
|
||||
return HOP_PROCESS;
|
||||
}
|
||||
}
|
||||
|
||||
static int intel_pt_walk_trace(struct intel_pt_decoder *decoder)
|
||||
{
|
||||
bool no_tip = false;
|
||||
|
|
@ -1885,6 +2011,19 @@ static int intel_pt_walk_trace(struct intel_pt_decoder *decoder)
|
|||
if (err)
|
||||
return err;
|
||||
next:
|
||||
if (decoder->hop) {
|
||||
switch (intel_pt_hop_trace(decoder, &no_tip, &err)) {
|
||||
case HOP_IGNORE:
|
||||
continue;
|
||||
case HOP_RETURN:
|
||||
return err;
|
||||
case HOP_AGAIN:
|
||||
goto next;
|
||||
default:
|
||||
break;
|
||||
}
|
||||
}
|
||||
|
||||
switch (decoder->packet.type) {
|
||||
case INTEL_PT_TNT:
|
||||
if (!decoder->packet.count)
|
||||
|
|
@ -1914,6 +2053,12 @@ next:
|
|||
decoder->state.from_ip = 0;
|
||||
decoder->state.to_ip = decoder->ip;
|
||||
decoder->state.type |= INTEL_PT_TRACE_BEGIN;
|
||||
/*
|
||||
* In hop mode, resample to get the to_ip as an
|
||||
* "instruction" sample.
|
||||
*/
|
||||
if (decoder->hop)
|
||||
decoder->pkt_state = INTEL_PT_STATE_RESAMPLE;
|
||||
return 0;
|
||||
}
|
||||
|
||||
|
|
@ -2033,7 +2178,7 @@ next:
|
|||
|
||||
case INTEL_PT_MODE_TSX:
|
||||
/* MODE_TSX need not be followed by FUP */
|
||||
if (!decoder->pge) {
|
||||
if (!decoder->pge || decoder->in_psb) {
|
||||
intel_pt_update_in_tx(decoder);
|
||||
break;
|
||||
}
|
||||
|
|
@ -2424,7 +2569,11 @@ static int intel_pt_sync_ip(struct intel_pt_decoder *decoder)
|
|||
if (err)
|
||||
return err;
|
||||
|
||||
decoder->pkt_state = INTEL_PT_STATE_IN_SYNC;
|
||||
/* In hop mode, resample to get the to_ip as an "instruction" sample */
|
||||
if (decoder->hop)
|
||||
decoder->pkt_state = INTEL_PT_STATE_RESAMPLE;
|
||||
else
|
||||
decoder->pkt_state = INTEL_PT_STATE_IN_SYNC;
|
||||
decoder->overflow = false;
|
||||
|
||||
decoder->state.from_ip = 0;
|
||||
|
|
@ -2545,7 +2694,14 @@ static int intel_pt_sync(struct intel_pt_decoder *decoder)
|
|||
|
||||
if (decoder->ip) {
|
||||
decoder->state.type = 0; /* Do not have a sample */
|
||||
decoder->pkt_state = INTEL_PT_STATE_IN_SYNC;
|
||||
/*
|
||||
* In hop mode, resample to get the PSB FUP ip as an
|
||||
* "instruction" sample.
|
||||
*/
|
||||
if (decoder->hop)
|
||||
decoder->pkt_state = INTEL_PT_STATE_RESAMPLE;
|
||||
else
|
||||
decoder->pkt_state = INTEL_PT_STATE_IN_SYNC;
|
||||
} else {
|
||||
return intel_pt_sync_ip(decoder);
|
||||
}
|
||||
|
|
@ -2609,6 +2765,9 @@ const struct intel_pt_state *intel_pt_decode(struct intel_pt_decoder *decoder)
|
|||
if (err == -EAGAIN)
|
||||
err = intel_pt_walk_trace(decoder);
|
||||
break;
|
||||
case INTEL_PT_STATE_RESAMPLE:
|
||||
err = intel_pt_resample(decoder);
|
||||
break;
|
||||
default:
|
||||
err = intel_pt_bug(decoder);
|
||||
break;
|
||||
|
|
|
|||
|
|
@ -250,6 +250,7 @@ struct intel_pt_params {
|
|||
uint32_t tsc_ctc_ratio_n;
|
||||
uint32_t tsc_ctc_ratio_d;
|
||||
enum intel_pt_param_flags flags;
|
||||
unsigned int quick;
|
||||
};
|
||||
|
||||
struct intel_pt_decoder;
|
||||
|
|
|
|||
|
|
@ -1030,6 +1030,7 @@ static struct intel_pt_queue *intel_pt_alloc_queue(struct intel_pt *pt,
|
|||
params.mtc_period = intel_pt_mtc_period(pt);
|
||||
params.tsc_ctc_ratio_n = pt->tsc_ctc_ratio_n;
|
||||
params.tsc_ctc_ratio_d = pt->tsc_ctc_ratio_d;
|
||||
params.quick = pt->synth_opts.quick;
|
||||
|
||||
if (pt->filts.cnt > 0)
|
||||
params.pgd_ip = intel_pt_pgd_ip;
|
||||
|
|
@ -1423,7 +1424,10 @@ static int intel_pt_synth_instruction_sample(struct intel_pt_queue *ptq)
|
|||
|
||||
sample.id = ptq->pt->instructions_id;
|
||||
sample.stream_id = ptq->pt->instructions_id;
|
||||
sample.period = ptq->state->tot_insn_cnt - ptq->last_insn_cnt;
|
||||
if (pt->synth_opts.quick)
|
||||
sample.period = 1;
|
||||
else
|
||||
sample.period = ptq->state->tot_insn_cnt - ptq->last_insn_cnt;
|
||||
|
||||
sample.cyc_cnt = ptq->ipc_cyc_cnt - ptq->last_in_cyc_cnt;
|
||||
if (sample.cyc_cnt) {
|
||||
|
|
|
|||
Loading…
Reference in New Issue