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intel_pstate: Add tsc collection and keep previous target pstate

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The intel_pstate driver is difficult to debug and investigate without tsc.

Also, it is likely use of tsc, and some version of C0 percentage,
will be re-introdcued in futute.

There have also been occasions where it is desirebale to know, and
confirm, the previous target pstate.

This patch brings back tsc, adds previous target pstate,
and adds both to the trace data collection.

Signed-off-by: Doug Smythies <dsmythies@telus.net>
Acked-by: Kristen Carlson Accardi <kristen@linux.intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
Doug Smythies 2015-04-11 21:10:26 -07:00 committed by Rafael J. Wysocki
parent b904f5cce1
commit 4055fad340
2 changed files with 38 additions and 18 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

31
drivers/cpufreq/intel_pstate.c
View File

@ -68,6 +68,7 @@ struct sample {
int32_t core_pct_busy;
u64 aperf;
u64 mperf;
u64 tsc;
int freq;
ktime_t time;
};
@ -109,6 +110,7 @@ struct cpudata {
ktime_t last_sample_time;
u64 prev_aperf;
u64 prev_mperf;
u64 prev_tsc;
struct sample sample;
};
@ -756,23 +758,28 @@ static inline void intel_pstate_sample(struct cpudata *cpu)
{
u64 aperf, mperf;
unsigned long flags;
u64 tsc;
local_irq_save(flags);
rdmsrl(MSR_IA32_APERF, aperf);
rdmsrl(MSR_IA32_MPERF, mperf);
tsc = native_read_tsc();
local_irq_restore(flags);
cpu->last_sample_time = cpu->sample.time;
cpu->sample.time = ktime_get();
cpu->sample.aperf = aperf;
cpu->sample.mperf = mperf;
cpu->sample.tsc = tsc;
cpu->sample.aperf -= cpu->prev_aperf;
cpu->sample.mperf -= cpu->prev_mperf;
cpu->sample.tsc -= cpu->prev_tsc;
intel_pstate_calc_busy(cpu);
cpu->prev_aperf = aperf;
cpu->prev_mperf = mperf;
cpu->prev_tsc = tsc;
}
static inline void intel_hwp_set_sample_time(struct cpudata *cpu)
@ -837,6 +844,10 @@ static inline void intel_pstate_adjust_busy_pstate(struct cpudata *cpu)
int32_t busy_scaled;
struct _pid *pid;
signed int ctl;
int from;
struct sample *sample;
from = cpu->pstate.current_pstate;
pid = &cpu->pid;
busy_scaled = intel_pstate_get_scaled_busy(cpu);
@ -845,6 +856,16 @@ static inline void intel_pstate_adjust_busy_pstate(struct cpudata *cpu)
/* Negative values of ctl increase the pstate and vice versa */
intel_pstate_set_pstate(cpu, cpu->pstate.current_pstate - ctl);
sample = &cpu->sample;
trace_pstate_sample(fp_toint(sample->core_pct_busy),
fp_toint(busy_scaled),
from,
cpu->pstate.current_pstate,
sample->mperf,
sample->aperf,
sample->tsc,
sample->freq);
}
static void intel_hwp_timer_func(unsigned long __data)
@ -858,21 +879,11 @@ static void intel_hwp_timer_func(unsigned long __data)
static void intel_pstate_timer_func(unsigned long __data)
{
struct cpudata *cpu = (struct cpudata *) __data;
struct sample *sample;
intel_pstate_sample(cpu);
sample = &cpu->sample;
intel_pstate_adjust_busy_pstate(cpu);
trace_pstate_sample(fp_toint(sample->core_pct_busy),
fp_toint(intel_pstate_get_scaled_busy(cpu)),
cpu->pstate.current_pstate,
sample->mperf,
sample->aperf,
sample->freq);
intel_pstate_set_sample_time(cpu);
}

25
include/trace/events/power.h
View File

@ -42,45 +42,54 @@ TRACE_EVENT(pstate_sample,
TP_PROTO(u32 core_busy,
u32 scaled_busy,
u32 state,
u32 from,
u32 to,
u64 mperf,
u64 aperf,
u64 tsc,
u32 freq
),
TP_ARGS(core_busy,
scaled_busy,
state,
from,
to,
mperf,
aperf,
tsc,
freq
),
TP_STRUCT__entry(
__field(u32, core_busy)
__field(u32, scaled_busy)
__field(u32, state)
__field(u32, from)
__field(u32, to)
__field(u64, mperf)
__field(u64, aperf)
__field(u64, tsc)
__field(u32, freq)
),
),
TP_fast_assign(
__entry->core_busy = core_busy;
__entry->scaled_busy = scaled_busy;
__entry->state = state;
__entry->from = from;
__entry->to = to;
__entry->mperf = mperf;
__entry->aperf = aperf;
__entry->tsc = tsc;
__entry->freq = freq;
),
TP_printk("core_busy=%lu scaled=%lu state=%lu mperf=%llu aperf=%llu freq=%lu ",
TP_printk("core_busy=%lu scaled=%lu from=%lu to=%lu mperf=%llu aperf=%llu tsc=%llu freq=%lu ",
(unsigned long)__entry->core_busy,
(unsigned long)__entry->scaled_busy,
(unsigned long)__entry->state,
(unsigned long)__entry->from,
(unsigned long)__entry->to,
(unsigned long long)__entry->mperf,
(unsigned long long)__entry->aperf,
(unsigned long long)__entry->tsc,
(unsigned long)__entry->freq
)