Add frequency, mperf, aperf and tsc in the trace. This can be used
to debug and tune the performance of AMD P-state driver.
Use the time difference between amd_pstate_update to calculate CPU
frequency. There could be sleep in arch_freq_get_on_cpu, so do not
use it here.
Signed-off-by: Jinzhou Su <[email protected]>
Signed-off-by: Huang Rui <[email protected]>
---
drivers/cpufreq/amd-pstate-trace.h | 22 ++++++++++-
drivers/cpufreq/amd-pstate.c | 59 +++++++++++++++++++++++++++++-
2 files changed, 78 insertions(+), 3 deletions(-)
diff --git a/drivers/cpufreq/amd-pstate-trace.h b/drivers/cpufreq/amd-pstate-trace.h
index 647505957d4f..35f38ae67fb1 100644
--- a/drivers/cpufreq/amd-pstate-trace.h
+++ b/drivers/cpufreq/amd-pstate-trace.h
@@ -27,6 +27,10 @@ TRACE_EVENT(amd_pstate_perf,
TP_PROTO(unsigned long min_perf,
unsigned long target_perf,
unsigned long capacity,
+ u64 freq,
+ u64 mperf,
+ u64 aperf,
+ u64 tsc,
unsigned int cpu_id,
bool changed,
bool fast_switch
@@ -35,6 +39,10 @@ TRACE_EVENT(amd_pstate_perf,
TP_ARGS(min_perf,
target_perf,
capacity,
+ freq,
+ mperf,
+ aperf,
+ tsc,
cpu_id,
changed,
fast_switch
@@ -44,6 +52,10 @@ TRACE_EVENT(amd_pstate_perf,
__field(unsigned long, min_perf)
__field(unsigned long, target_perf)
__field(unsigned long, capacity)
+ __field(unsigned long long, freq)
+ __field(unsigned long long, mperf)
+ __field(unsigned long long, aperf)
+ __field(unsigned long long, tsc)
__field(unsigned int, cpu_id)
__field(bool, changed)
__field(bool, fast_switch)
@@ -53,15 +65,23 @@ TRACE_EVENT(amd_pstate_perf,
__entry->min_perf = min_perf;
__entry->target_perf = target_perf;
__entry->capacity = capacity;
+ __entry->freq = freq;
+ __entry->mperf = mperf;
+ __entry->aperf = aperf;
+ __entry->tsc = tsc;
__entry->cpu_id = cpu_id;
__entry->changed = changed;
__entry->fast_switch = fast_switch;
),
- TP_printk("amd_min_perf=%lu amd_des_perf=%lu amd_max_perf=%lu cpu_id=%u changed=%s fast_switch=%s",
+ TP_printk("amd_min_perf=%lu amd_des_perf=%lu amd_max_perf=%lu freq=%llu mperf=%llu aperf=%llu tsc=%llu cpu_id=%u changed=%s fast_switch=%s",
(unsigned long)__entry->min_perf,
(unsigned long)__entry->target_perf,
(unsigned long)__entry->capacity,
+ (unsigned long long)__entry->freq,
+ (unsigned long long)__entry->mperf,
+ (unsigned long long)__entry->aperf,
+ (unsigned long long)__entry->tsc,
(unsigned int)__entry->cpu_id,
(__entry->changed) ? "true" : "false",
(__entry->fast_switch) ? "true" : "false"
diff --git a/drivers/cpufreq/amd-pstate.c b/drivers/cpufreq/amd-pstate.c
index 9ce75ed11f8e..7be38bc6a673 100644
--- a/drivers/cpufreq/amd-pstate.c
+++ b/drivers/cpufreq/amd-pstate.c
@@ -65,6 +65,18 @@ MODULE_PARM_DESC(shared_mem,
static struct cpufreq_driver amd_pstate_driver;
+/**
+ * struct amd_aperf_mperf
+ * @aperf: actual performance frequency clock count
+ * @mperf: maximum performance frequency clock count
+ * @tsc: time stamp counter
+ */
+struct amd_aperf_mperf {
+ u64 aperf;
+ u64 mperf;
+ u64 tsc;
+};
+
/**
* struct amd_cpudata - private CPU data for AMD P-State
* @cpu: CPU number
@@ -81,6 +93,9 @@ static struct cpufreq_driver amd_pstate_driver;
* @min_freq: the frequency that mapped to lowest_perf
* @nominal_freq: the frequency that mapped to nominal_perf
* @lowest_nonlinear_freq: the frequency that mapped to lowest_nonlinear_perf
+ * @cur: Difference of Aperf/Mperf/tsc count between last and current sample
+ * @prev: Last Aperf/Mperf/tsc count value read from register
+ * @freq: current cpu frequency value
* @boost_supported: check whether the Processor or SBIOS supports boost mode
*
* The amd_cpudata is key private data for each CPU thread in AMD P-State, and
@@ -102,6 +117,10 @@ struct amd_cpudata {
u32 nominal_freq;
u32 lowest_nonlinear_freq;
+ struct amd_aperf_mperf cur;
+ struct amd_aperf_mperf prev;
+
+ u64 freq;
bool boost_supported;
};
@@ -211,6 +230,39 @@ static inline void amd_pstate_update_perf(struct amd_cpudata *cpudata,
max_perf, fast_switch);
}
+static inline bool amd_pstate_sample(struct amd_cpudata *cpudata)
+{
+ u64 aperf, mperf, tsc;
+ unsigned long flags;
+
+ local_irq_save(flags);
+ rdmsrl(MSR_IA32_APERF, aperf);
+ rdmsrl(MSR_IA32_MPERF, mperf);
+ tsc = rdtsc();
+
+ if (cpudata->prev.mperf == mperf || cpudata->prev.tsc == tsc) {
+ local_irq_restore(flags);
+ return false;
+ }
+
+ local_irq_restore(flags);
+
+ cpudata->cur.aperf = aperf;
+ cpudata->cur.mperf = mperf;
+ cpudata->cur.tsc = tsc;
+ cpudata->cur.aperf -= cpudata->prev.aperf;
+ cpudata->cur.mperf -= cpudata->prev.mperf;
+ cpudata->cur.tsc -= cpudata->prev.tsc;
+
+ cpudata->prev.aperf = aperf;
+ cpudata->prev.mperf = mperf;
+ cpudata->prev.tsc = tsc;
+
+ cpudata->freq = div64_u64((cpudata->cur.aperf * cpu_khz), cpudata->cur.mperf);
+
+ return true;
+}
+
static void amd_pstate_update(struct amd_cpudata *cpudata, u32 min_perf,
u32 des_perf, u32 max_perf, bool fast_switch)
{
@@ -226,8 +278,11 @@ static void amd_pstate_update(struct amd_cpudata *cpudata, u32 min_perf,
value &= ~AMD_CPPC_MAX_PERF(~0L);
value |= AMD_CPPC_MAX_PERF(max_perf);
- trace_amd_pstate_perf(min_perf, des_perf, max_perf,
- cpudata->cpu, (value != prev), fast_switch);
+ if (trace_amd_pstate_perf_enabled() && amd_pstate_sample(cpudata)) {
+ trace_amd_pstate_perf(min_perf, des_perf, max_perf, cpudata->freq,
+ cpudata->cur.mperf, cpudata->cur.aperf, cpudata->cur.tsc,
+ cpudata->cpu, (value != prev), fast_switch);
+ }
if (value == prev)
return;
--
2.27.0
On Wed, Feb 23, 2022 at 11:04 AM Jinzhou Su <[email protected]> wrote:
>
> Add frequency, mperf, aperf and tsc in the trace. This can be used
> to debug and tune the performance of AMD P-state driver.
>
> Use the time difference between amd_pstate_update to calculate CPU
> frequency. There could be sleep in arch_freq_get_on_cpu, so do not
> use it here.
>
> Signed-off-by: Jinzhou Su <[email protected]>
> Signed-off-by: Huang Rui <[email protected]>
I'm not sure what the second sign-off is for.
If this is a maintainer's sign-off, it should be added by the
maintainer himself and you should not add it when submitting the
patch.
> ---
> drivers/cpufreq/amd-pstate-trace.h | 22 ++++++++++-
> drivers/cpufreq/amd-pstate.c | 59 +++++++++++++++++++++++++++++-
> 2 files changed, 78 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/cpufreq/amd-pstate-trace.h b/drivers/cpufreq/amd-pstate-trace.h
> index 647505957d4f..35f38ae67fb1 100644
> --- a/drivers/cpufreq/amd-pstate-trace.h
> +++ b/drivers/cpufreq/amd-pstate-trace.h
> @@ -27,6 +27,10 @@ TRACE_EVENT(amd_pstate_perf,
> TP_PROTO(unsigned long min_perf,
> unsigned long target_perf,
> unsigned long capacity,
> + u64 freq,
> + u64 mperf,
> + u64 aperf,
> + u64 tsc,
> unsigned int cpu_id,
> bool changed,
> bool fast_switch
> @@ -35,6 +39,10 @@ TRACE_EVENT(amd_pstate_perf,
> TP_ARGS(min_perf,
> target_perf,
> capacity,
> + freq,
> + mperf,
> + aperf,
> + tsc,
> cpu_id,
> changed,
> fast_switch
> @@ -44,6 +52,10 @@ TRACE_EVENT(amd_pstate_perf,
> __field(unsigned long, min_perf)
> __field(unsigned long, target_perf)
> __field(unsigned long, capacity)
> + __field(unsigned long long, freq)
> + __field(unsigned long long, mperf)
> + __field(unsigned long long, aperf)
> + __field(unsigned long long, tsc)
> __field(unsigned int, cpu_id)
> __field(bool, changed)
> __field(bool, fast_switch)
> @@ -53,15 +65,23 @@ TRACE_EVENT(amd_pstate_perf,
> __entry->min_perf = min_perf;
> __entry->target_perf = target_perf;
> __entry->capacity = capacity;
> + __entry->freq = freq;
> + __entry->mperf = mperf;
> + __entry->aperf = aperf;
> + __entry->tsc = tsc;
> __entry->cpu_id = cpu_id;
> __entry->changed = changed;
> __entry->fast_switch = fast_switch;
> ),
>
> - TP_printk("amd_min_perf=%lu amd_des_perf=%lu amd_max_perf=%lu cpu_id=%u changed=%s fast_switch=%s",
> + TP_printk("amd_min_perf=%lu amd_des_perf=%lu amd_max_perf=%lu freq=%llu mperf=%llu aperf=%llu tsc=%llu cpu_id=%u changed=%s fast_switch=%s",
> (unsigned long)__entry->min_perf,
> (unsigned long)__entry->target_perf,
> (unsigned long)__entry->capacity,
> + (unsigned long long)__entry->freq,
> + (unsigned long long)__entry->mperf,
> + (unsigned long long)__entry->aperf,
> + (unsigned long long)__entry->tsc,
> (unsigned int)__entry->cpu_id,
> (__entry->changed) ? "true" : "false",
> (__entry->fast_switch) ? "true" : "false"
> diff --git a/drivers/cpufreq/amd-pstate.c b/drivers/cpufreq/amd-pstate.c
> index 9ce75ed11f8e..7be38bc6a673 100644
> --- a/drivers/cpufreq/amd-pstate.c
> +++ b/drivers/cpufreq/amd-pstate.c
> @@ -65,6 +65,18 @@ MODULE_PARM_DESC(shared_mem,
>
> static struct cpufreq_driver amd_pstate_driver;
>
> +/**
> + * struct amd_aperf_mperf
> + * @aperf: actual performance frequency clock count
> + * @mperf: maximum performance frequency clock count
> + * @tsc: time stamp counter
> + */
> +struct amd_aperf_mperf {
> + u64 aperf;
> + u64 mperf;
> + u64 tsc;
> +};
> +
> /**
> * struct amd_cpudata - private CPU data for AMD P-State
> * @cpu: CPU number
> @@ -81,6 +93,9 @@ static struct cpufreq_driver amd_pstate_driver;
> * @min_freq: the frequency that mapped to lowest_perf
> * @nominal_freq: the frequency that mapped to nominal_perf
> * @lowest_nonlinear_freq: the frequency that mapped to lowest_nonlinear_perf
> + * @cur: Difference of Aperf/Mperf/tsc count between last and current sample
> + * @prev: Last Aperf/Mperf/tsc count value read from register
> + * @freq: current cpu frequency value
> * @boost_supported: check whether the Processor or SBIOS supports boost mode
> *
> * The amd_cpudata is key private data for each CPU thread in AMD P-State, and
> @@ -102,6 +117,10 @@ struct amd_cpudata {
> u32 nominal_freq;
> u32 lowest_nonlinear_freq;
>
> + struct amd_aperf_mperf cur;
> + struct amd_aperf_mperf prev;
> +
> + u64 freq;
> bool boost_supported;
> };
>
> @@ -211,6 +230,39 @@ static inline void amd_pstate_update_perf(struct amd_cpudata *cpudata,
> max_perf, fast_switch);
> }
>
> +static inline bool amd_pstate_sample(struct amd_cpudata *cpudata)
> +{
> + u64 aperf, mperf, tsc;
> + unsigned long flags;
> +
> + local_irq_save(flags);
> + rdmsrl(MSR_IA32_APERF, aperf);
> + rdmsrl(MSR_IA32_MPERF, mperf);
> + tsc = rdtsc();
> +
> + if (cpudata->prev.mperf == mperf || cpudata->prev.tsc == tsc) {
> + local_irq_restore(flags);
> + return false;
> + }
> +
> + local_irq_restore(flags);
> +
> + cpudata->cur.aperf = aperf;
> + cpudata->cur.mperf = mperf;
> + cpudata->cur.tsc = tsc;
> + cpudata->cur.aperf -= cpudata->prev.aperf;
> + cpudata->cur.mperf -= cpudata->prev.mperf;
> + cpudata->cur.tsc -= cpudata->prev.tsc;
> +
> + cpudata->prev.aperf = aperf;
> + cpudata->prev.mperf = mperf;
> + cpudata->prev.tsc = tsc;
> +
> + cpudata->freq = div64_u64((cpudata->cur.aperf * cpu_khz), cpudata->cur.mperf);
> +
> + return true;
> +}
> +
> static void amd_pstate_update(struct amd_cpudata *cpudata, u32 min_perf,
> u32 des_perf, u32 max_perf, bool fast_switch)
> {
> @@ -226,8 +278,11 @@ static void amd_pstate_update(struct amd_cpudata *cpudata, u32 min_perf,
> value &= ~AMD_CPPC_MAX_PERF(~0L);
> value |= AMD_CPPC_MAX_PERF(max_perf);
>
> - trace_amd_pstate_perf(min_perf, des_perf, max_perf,
> - cpudata->cpu, (value != prev), fast_switch);
> + if (trace_amd_pstate_perf_enabled() && amd_pstate_sample(cpudata)) {
> + trace_amd_pstate_perf(min_perf, des_perf, max_perf, cpudata->freq,
> + cpudata->cur.mperf, cpudata->cur.aperf, cpudata->cur.tsc,
> + cpudata->cpu, (value != prev), fast_switch);
> + }
>
> if (value == prev)
> return;
> --
> 2.27.0
>
[AMD Official Use Only]
> -----Original Message-----
> From: Rafael J. Wysocki <[email protected]>
> Sent: Tuesday, March 1, 2022 10:26 AM
> To: Su, Jinzhou (Joe) <[email protected]>
> Cc: Rafael J. Wysocki <[email protected]>; Linux PM <linux-
> [email protected]>; Srinivas Pandruvada
> <[email protected]>; Doug Smythies
> <[email protected]>; Huang, Ray <[email protected]>; Viresh Kumar
> <[email protected]>; Todd Brandt <[email protected]>;
> Linux Kernel Mailing List <[email protected]>; Sharma, Deepak
> <[email protected]>; Deucher, Alexander
> <[email protected]>; Du, Xiaojian <[email protected]>;
> Yuan, Perry <[email protected]>; Meng, Li (Jassmine)
> <[email protected]>
> Subject: Re: [PATCH 1/3] cpufreq: amd-pstate: Add more tracepoint for AMD
> P-State module
>
> On Wed, Feb 23, 2022 at 11:04 AM Jinzhou Su <[email protected]>
> wrote:
> >
> > Add frequency, mperf, aperf and tsc in the trace. This can be used to
> > debug and tune the performance of AMD P-state driver.
> >
> > Use the time difference between amd_pstate_update to calculate CPU
> > frequency. There could be sleep in arch_freq_get_on_cpu, so do not use
> > it here.
> >
> > Signed-off-by: Jinzhou Su <[email protected]>
> > Signed-off-by: Huang Rui <[email protected]>
>
> I'm not sure what the second sign-off is for.
>
> If this is a maintainer's sign-off, it should be added by the maintainer himself
> and you should not add it when submitting the patch.
Both developers co-worked on the patch. Isn't that pretty standard when you rework someone else's patch?
Alex
>
> > ---
> > drivers/cpufreq/amd-pstate-trace.h | 22 ++++++++++-
> > drivers/cpufreq/amd-pstate.c | 59
> +++++++++++++++++++++++++++++-
> > 2 files changed, 78 insertions(+), 3 deletions(-)
> >
> > diff --git a/drivers/cpufreq/amd-pstate-trace.h
> > b/drivers/cpufreq/amd-pstate-trace.h
> > index 647505957d4f..35f38ae67fb1 100644
> > --- a/drivers/cpufreq/amd-pstate-trace.h
> > +++ b/drivers/cpufreq/amd-pstate-trace.h
> > @@ -27,6 +27,10 @@ TRACE_EVENT(amd_pstate_perf,
> > TP_PROTO(unsigned long min_perf,
> > unsigned long target_perf,
> > unsigned long capacity,
> > + u64 freq,
> > + u64 mperf,
> > + u64 aperf,
> > + u64 tsc,
> > unsigned int cpu_id,
> > bool changed,
> > bool fast_switch
> > @@ -35,6 +39,10 @@ TRACE_EVENT(amd_pstate_perf,
> > TP_ARGS(min_perf,
> > target_perf,
> > capacity,
> > + freq,
> > + mperf,
> > + aperf,
> > + tsc,
> > cpu_id,
> > changed,
> > fast_switch
> > @@ -44,6 +52,10 @@ TRACE_EVENT(amd_pstate_perf,
> > __field(unsigned long, min_perf)
> > __field(unsigned long, target_perf)
> > __field(unsigned long, capacity)
> > + __field(unsigned long long, freq)
> > + __field(unsigned long long, mperf)
> > + __field(unsigned long long, aperf)
> > + __field(unsigned long long, tsc)
> > __field(unsigned int, cpu_id)
> > __field(bool, changed)
> > __field(bool, fast_switch) @@ -53,15 +65,23 @@
> > TRACE_EVENT(amd_pstate_perf,
> > __entry->min_perf = min_perf;
> > __entry->target_perf = target_perf;
> > __entry->capacity = capacity;
> > + __entry->freq = freq;
> > + __entry->mperf = mperf;
> > + __entry->aperf = aperf;
> > + __entry->tsc = tsc;
> > __entry->cpu_id = cpu_id;
> > __entry->changed = changed;
> > __entry->fast_switch = fast_switch;
> > ),
> >
> > - TP_printk("amd_min_perf=%lu amd_des_perf=%lu
> amd_max_perf=%lu cpu_id=%u changed=%s fast_switch=%s",
> > + TP_printk("amd_min_perf=%lu amd_des_perf=%lu
> amd_max_perf=%lu
> > + freq=%llu mperf=%llu aperf=%llu tsc=%llu cpu_id=%u changed=%s
> > + fast_switch=%s",
> > (unsigned long)__entry->min_perf,
> > (unsigned long)__entry->target_perf,
> > (unsigned long)__entry->capacity,
> > + (unsigned long long)__entry->freq,
> > + (unsigned long long)__entry->mperf,
> > + (unsigned long long)__entry->aperf,
> > + (unsigned long long)__entry->tsc,
> > (unsigned int)__entry->cpu_id,
> > (__entry->changed) ? "true" : "false",
> > (__entry->fast_switch) ? "true" : "false"
> > diff --git a/drivers/cpufreq/amd-pstate.c
> > b/drivers/cpufreq/amd-pstate.c index 9ce75ed11f8e..7be38bc6a673
> 100644
> > --- a/drivers/cpufreq/amd-pstate.c
> > +++ b/drivers/cpufreq/amd-pstate.c
> > @@ -65,6 +65,18 @@ MODULE_PARM_DESC(shared_mem,
> >
> > static struct cpufreq_driver amd_pstate_driver;
> >
> > +/**
> > + * struct amd_aperf_mperf
> > + * @aperf: actual performance frequency clock count
> > + * @mperf: maximum performance frequency clock count
> > + * @tsc: time stamp counter
> > + */
> > +struct amd_aperf_mperf {
> > + u64 aperf;
> > + u64 mperf;
> > + u64 tsc;
> > +};
> > +
> > /**
> > * struct amd_cpudata - private CPU data for AMD P-State
> > * @cpu: CPU number
> > @@ -81,6 +93,9 @@ static struct cpufreq_driver amd_pstate_driver;
> > * @min_freq: the frequency that mapped to lowest_perf
> > * @nominal_freq: the frequency that mapped to nominal_perf
> > * @lowest_nonlinear_freq: the frequency that mapped to
> > lowest_nonlinear_perf
> > + * @cur: Difference of Aperf/Mperf/tsc count between last and current
> > + sample
> > + * @prev: Last Aperf/Mperf/tsc count value read from register
> > + * @freq: current cpu frequency value
> > * @boost_supported: check whether the Processor or SBIOS supports
> boost mode
> > *
> > * The amd_cpudata is key private data for each CPU thread in AMD
> > P-State, and @@ -102,6 +117,10 @@ struct amd_cpudata {
> > u32 nominal_freq;
> > u32 lowest_nonlinear_freq;
> >
> > + struct amd_aperf_mperf cur;
> > + struct amd_aperf_mperf prev;
> > +
> > + u64 freq;
> > bool boost_supported;
> > };
> >
> > @@ -211,6 +230,39 @@ static inline void amd_pstate_update_perf(struct
> amd_cpudata *cpudata,
> > max_perf, fast_switch); }
> >
> > +static inline bool amd_pstate_sample(struct amd_cpudata *cpudata) {
> > + u64 aperf, mperf, tsc;
> > + unsigned long flags;
> > +
> > + local_irq_save(flags);
> > + rdmsrl(MSR_IA32_APERF, aperf);
> > + rdmsrl(MSR_IA32_MPERF, mperf);
> > + tsc = rdtsc();
> > +
> > + if (cpudata->prev.mperf == mperf || cpudata->prev.tsc == tsc) {
> > + local_irq_restore(flags);
> > + return false;
> > + }
> > +
> > + local_irq_restore(flags);
> > +
> > + cpudata->cur.aperf = aperf;
> > + cpudata->cur.mperf = mperf;
> > + cpudata->cur.tsc = tsc;
> > + cpudata->cur.aperf -= cpudata->prev.aperf;
> > + cpudata->cur.mperf -= cpudata->prev.mperf;
> > + cpudata->cur.tsc -= cpudata->prev.tsc;
> > +
> > + cpudata->prev.aperf = aperf;
> > + cpudata->prev.mperf = mperf;
> > + cpudata->prev.tsc = tsc;
> > +
> > + cpudata->freq = div64_u64((cpudata->cur.aperf * cpu_khz),
> > + cpudata->cur.mperf);
> > +
> > + return true;
> > +}
> > +
> > static void amd_pstate_update(struct amd_cpudata *cpudata, u32
> min_perf,
> > u32 des_perf, u32 max_perf, bool
> > fast_switch) { @@ -226,8 +278,11 @@ static void
> > amd_pstate_update(struct amd_cpudata *cpudata, u32 min_perf,
> > value &= ~AMD_CPPC_MAX_PERF(~0L);
> > value |= AMD_CPPC_MAX_PERF(max_perf);
> >
> > - trace_amd_pstate_perf(min_perf, des_perf, max_perf,
> > - cpudata->cpu, (value != prev), fast_switch);
> > + if (trace_amd_pstate_perf_enabled() &&
> amd_pstate_sample(cpudata)) {
> > + trace_amd_pstate_perf(min_perf, des_perf, max_perf, cpudata-
> >freq,
> > + cpudata->cur.mperf, cpudata->cur.aperf, cpudata->cur.tsc,
> > + cpudata->cpu, (value != prev), fast_switch);
> > + }
> >
> > if (value == prev)
> > return;
> > --
> > 2.27.0
> >
On Tue, Mar 1, 2022 at 5:05 PM Deucher, Alexander
<[email protected]> wrote:
>
> [AMD Official Use Only]
>
> > -----Original Message-----
> > From: Rafael J. Wysocki <[email protected]>
> > Sent: Tuesday, March 1, 2022 10:26 AM
> > To: Su, Jinzhou (Joe) <[email protected]>
> > Cc: Rafael J. Wysocki <[email protected]>; Linux PM <linux-
> > [email protected]>; Srinivas Pandruvada
> > <[email protected]>; Doug Smythies
> > <[email protected]>; Huang, Ray <[email protected]>; Viresh Kumar
> > <[email protected]>; Todd Brandt <[email protected]>;
> > Linux Kernel Mailing List <[email protected]>; Sharma, Deepak
> > <[email protected]>; Deucher, Alexander
> > <[email protected]>; Du, Xiaojian <[email protected]>;
> > Yuan, Perry <[email protected]>; Meng, Li (Jassmine)
> > <[email protected]>
> > Subject: Re: [PATCH 1/3] cpufreq: amd-pstate: Add more tracepoint for AMD
> > P-State module
> >
> > On Wed, Feb 23, 2022 at 11:04 AM Jinzhou Su <[email protected]>
> > wrote:
> > >
> > > Add frequency, mperf, aperf and tsc in the trace. This can be used to
> > > debug and tune the performance of AMD P-state driver.
> > >
> > > Use the time difference between amd_pstate_update to calculate CPU
> > > frequency. There could be sleep in arch_freq_get_on_cpu, so do not use
> > > it here.
> > >
> > > Signed-off-by: Jinzhou Su <[email protected]>
> > > Signed-off-by: Huang Rui <[email protected]>
> >
> > I'm not sure what the second sign-off is for.
> >
> > If this is a maintainer's sign-off, it should be added by the maintainer himself
> > and you should not add it when submitting the patch.
>
> Both developers co-worked on the patch. Isn't that pretty standard when you rework someone else's patch?
It is, but that's when Co-developed-by should be used. Otherwise the
meaning of the second s-o-b is unclear.
On Wed, Mar 02, 2022 at 12:07:45AM +0800, Rafael J. Wysocki wrote:
> On Tue, Mar 1, 2022 at 5:05 PM Deucher, Alexander
> <[email protected]> wrote:
> >
> > [AMD Official Use Only]
> >
> > > -----Original Message-----
> > > From: Rafael J. Wysocki <[email protected]>
> > > Sent: Tuesday, March 1, 2022 10:26 AM
> > > To: Su, Jinzhou (Joe) <[email protected]>
> > > Cc: Rafael J. Wysocki <[email protected]>; Linux PM <linux-
> > > [email protected]>; Srinivas Pandruvada
> > > <[email protected]>; Doug Smythies
> > > <[email protected]>; Huang, Ray <[email protected]>; Viresh Kumar
> > > <[email protected]>; Todd Brandt <[email protected]>;
> > > Linux Kernel Mailing List <[email protected]>; Sharma, Deepak
> > > <[email protected]>; Deucher, Alexander
> > > <[email protected]>; Du, Xiaojian <[email protected]>;
> > > Yuan, Perry <[email protected]>; Meng, Li (Jassmine)
> > > <[email protected]>
> > > Subject: Re: [PATCH 1/3] cpufreq: amd-pstate: Add more tracepoint for AMD
> > > P-State module
> > >
> > > On Wed, Feb 23, 2022 at 11:04 AM Jinzhou Su <[email protected]>
> > > wrote:
> > > >
> > > > Add frequency, mperf, aperf and tsc in the trace. This can be used to
> > > > debug and tune the performance of AMD P-state driver.
> > > >
> > > > Use the time difference between amd_pstate_update to calculate CPU
> > > > frequency. There could be sleep in arch_freq_get_on_cpu, so do not use
> > > > it here.
> > > >
> > > > Signed-off-by: Jinzhou Su <[email protected]>
> > > > Signed-off-by: Huang Rui <[email protected]>
> > >
> > > I'm not sure what the second sign-off is for.
> > >
> > > If this is a maintainer's sign-off, it should be added by the maintainer himself
> > > and you should not add it when submitting the patch.
> >
> > Both developers co-worked on the patch. Isn't that pretty standard when you rework someone else's patch?
>
> It is, but that's when Co-developed-by should be used. Otherwise the
> meaning of the second s-o-b is unclear.
Yes.
Joe, can you add below in next V2:
Co-developed-by: Huang Rui <[email protected]>
Patch looks good for me, could you please add new patch to describe how to
use the tracer script in Documentation/admin-guide/pm/amd-pstate.rst?
Thanks,
Ray
[AMD Official Use Only]
Comment in line.
Regards,
Joe
> -----Original Message-----
> From: Huang, Ray <[email protected]>
> Sent: Wednesday, March 2, 2022 5:09 PM
> To: Rafael J. Wysocki <[email protected]>; Su, Jinzhou (Joe)
> <[email protected]>
> Cc: Deucher, Alexander <[email protected]>; Rafael J. Wysocki
> <[email protected]>; Linux PM <[email protected]>; Srinivas
> Pandruvada <[email protected]>; Doug Smythies
> <[email protected]>; Viresh Kumar <[email protected]>; Todd
> Brandt <[email protected]>; Linux Kernel Mailing List <linux-
> [email protected]>; Sharma, Deepak <[email protected]>; Du,
> Xiaojian <[email protected]>; Yuan, Perry <[email protected]>;
> Meng, Li (Jassmine) <[email protected]>
> Subject: Re: [PATCH 1/3] cpufreq: amd-pstate: Add more tracepoint for AMD P-
> State module
>
> On Wed, Mar 02, 2022 at 12:07:45AM +0800, Rafael J. Wysocki wrote:
> > On Tue, Mar 1, 2022 at 5:05 PM Deucher, Alexander
> > <[email protected]> wrote:
> > >
> > > [AMD Official Use Only]
> > >
> > > > -----Original Message-----
> > > > From: Rafael J. Wysocki <[email protected]>
> > > > Sent: Tuesday, March 1, 2022 10:26 AM
> > > > To: Su, Jinzhou (Joe) <[email protected]>
> > > > Cc: Rafael J. Wysocki <[email protected]>; Linux PM <linux-
> > > > [email protected]>; Srinivas Pandruvada
> > > > <[email protected]>; Doug Smythies
> > > > <[email protected]>; Huang, Ray <[email protected]>; Viresh
> > > > Kumar <[email protected]>; Todd Brandt
> > > > <[email protected]>; Linux Kernel Mailing List
> > > > <[email protected]>; Sharma, Deepak
> > > > <[email protected]>; Deucher, Alexander
> > > > <[email protected]>; Du, Xiaojian <[email protected]>;
> > > > Yuan, Perry <[email protected]>; Meng, Li (Jassmine)
> > > > <[email protected]>
> > > > Subject: Re: [PATCH 1/3] cpufreq: amd-pstate: Add more tracepoint
> > > > for AMD P-State module
> > > >
> > > > On Wed, Feb 23, 2022 at 11:04 AM Jinzhou Su <[email protected]>
> > > > wrote:
> > > > >
> > > > > Add frequency, mperf, aperf and tsc in the trace. This can be
> > > > > used to debug and tune the performance of AMD P-state driver.
> > > > >
> > > > > Use the time difference between amd_pstate_update to calculate
> > > > > CPU frequency. There could be sleep in arch_freq_get_on_cpu, so
> > > > > do not use it here.
> > > > >
> > > > > Signed-off-by: Jinzhou Su <[email protected]>
> > > > > Signed-off-by: Huang Rui <[email protected]>
> > > >
> > > > I'm not sure what the second sign-off is for.
> > > >
> > > > If this is a maintainer's sign-off, it should be added by the
> > > > maintainer himself and you should not add it when submitting the patch.
> > >
> > > Both developers co-worked on the patch. Isn't that pretty standard when
> you rework someone else's patch?
> >
> > It is, but that's when Co-developed-by should be used. Otherwise the
> > meaning of the second s-o-b is unclear.
>
> Yes.
>
> Joe, can you add below in next V2:
>
> Co-developed-by: Huang Rui <[email protected]>
>
> Patch looks good for me, could you please add new patch to describe how to
> use the tracer script in Documentation/admin-guide/pm/amd-pstate.rst?
Ok, will do that later.
Joe
>
> Thanks,
> Ray