* FAILED: patch "[PATCH] cpufreq: amd-pstate: Update policy->cur in" failed to apply to 6.3-stable tree
@ 2023-05-28 16:54 gregkh
2023-05-30 11:16 ` [PATCH 6.3.y] cpufreq: amd-pstate: Add ->fast_switch() callback Wyes Karny
2023-05-30 12:01 ` [PATCH 6.3.y] cpufreq: amd-pstate: Update policy->cur in amd_pstate_adjust_perf() Wyes Karny
0 siblings, 2 replies; 5+ messages in thread
From: gregkh @ 2023-05-28 16:54 UTC (permalink / raw)
To: wyes.karny, rafael.j.wysocki, stable; +Cc: stable
The patch below does not apply to the 6.3-stable tree.
If someone wants it applied there, or to any other stable or longterm
tree, then please email the backport, including the original git commit
id to <stable@vger.kernel.org>.
To reproduce the conflict and resubmit, you may use the following commands:
git fetch https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/ linux-6.3.y
git checkout FETCH_HEAD
git cherry-pick -x 3bf8c6307bad5c0cc09cde982e146d847859b651
# <resolve conflicts, build, test, etc.>
git commit -s
git send-email --to '<stable@vger.kernel.org>' --in-reply-to '2023052834-enlighten-vacate-bfd6@gregkh' --subject-prefix 'PATCH 6.3.y' HEAD^..
Possible dependencies:
3bf8c6307bad ("cpufreq: amd-pstate: Update policy->cur in amd_pstate_adjust_perf()")
2dd6d0ebf740 ("cpufreq: amd-pstate: Add guided autonomous mode")
3e6e07805764 ("Documentation: cpufreq: amd-pstate: Move amd_pstate param to alphabetical order")
thanks,
greg k-h
------------------ original commit in Linus's tree ------------------
From 3bf8c6307bad5c0cc09cde982e146d847859b651 Mon Sep 17 00:00:00 2001
From: Wyes Karny <wyes.karny@amd.com>
Date: Thu, 18 May 2023 05:58:19 +0000
Subject: [PATCH] cpufreq: amd-pstate: Update policy->cur in
amd_pstate_adjust_perf()
Driver should update policy->cur after updating the frequency.
Currently amd_pstate doesn't update policy->cur when `adjust_perf`
is used. Which causes /proc/cpuinfo to show wrong cpu frequency.
Fix this by updating policy->cur with correct frequency value in
adjust_perf function callback.
- Before the fix: (setting min freq to 1.5 MHz)
[root@amd]# cat /proc/cpuinfo | grep "cpu MHz" | sort | uniq --count
1 cpu MHz : 1777.016
1 cpu MHz : 1797.160
1 cpu MHz : 1797.270
189 cpu MHz : 400.000
- After the fix: (setting min freq to 1.5 MHz)
[root@amd]# cat /proc/cpuinfo | grep "cpu MHz" | sort | uniq --count
1 cpu MHz : 1753.353
1 cpu MHz : 1756.838
1 cpu MHz : 1776.466
1 cpu MHz : 1776.873
1 cpu MHz : 1777.308
1 cpu MHz : 1779.900
183 cpu MHz : 1805.231
1 cpu MHz : 1956.815
1 cpu MHz : 2246.203
1 cpu MHz : 2259.984
Fixes: 1d215f0319c2 ("cpufreq: amd-pstate: Add fast switch function for AMD P-State")
Signed-off-by: Wyes Karny <wyes.karny@amd.com>
[ rjw: Subject edits ]
Cc: 5.17+ <stable@vger.kernel.org> # 5.17+
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
diff --git a/drivers/cpufreq/amd-pstate.c b/drivers/cpufreq/amd-pstate.c
index ac54779f5a49..ddd346a239e0 100644
--- a/drivers/cpufreq/amd-pstate.c
+++ b/drivers/cpufreq/amd-pstate.c
@@ -501,12 +501,14 @@ static void amd_pstate_adjust_perf(unsigned int cpu,
unsigned long capacity)
{
unsigned long max_perf, min_perf, des_perf,
- cap_perf, lowest_nonlinear_perf;
+ cap_perf, lowest_nonlinear_perf, max_freq;
struct cpufreq_policy *policy = cpufreq_cpu_get(cpu);
struct amd_cpudata *cpudata = policy->driver_data;
+ unsigned int target_freq;
cap_perf = READ_ONCE(cpudata->highest_perf);
lowest_nonlinear_perf = READ_ONCE(cpudata->lowest_nonlinear_perf);
+ max_freq = READ_ONCE(cpudata->max_freq);
des_perf = cap_perf;
if (target_perf < capacity)
@@ -523,6 +525,10 @@ static void amd_pstate_adjust_perf(unsigned int cpu,
if (max_perf < min_perf)
max_perf = min_perf;
+ des_perf = clamp_t(unsigned long, des_perf, min_perf, max_perf);
+ target_freq = div_u64(des_perf * max_freq, max_perf);
+ policy->cur = target_freq;
+
amd_pstate_update(cpudata, min_perf, des_perf, max_perf, true,
policy->governor->flags);
cpufreq_cpu_put(policy);
^ permalink raw reply related [flat|nested] 5+ messages in thread* [PATCH 6.3.y] cpufreq: amd-pstate: Add ->fast_switch() callback
2023-05-28 16:54 FAILED: patch "[PATCH] cpufreq: amd-pstate: Update policy->cur in" failed to apply to 6.3-stable tree gregkh
@ 2023-05-30 11:16 ` Wyes Karny
2023-05-30 11:28 ` Wyes Karny
2023-05-30 12:01 ` [PATCH 6.3.y] cpufreq: amd-pstate: Update policy->cur in amd_pstate_adjust_perf() Wyes Karny
1 sibling, 1 reply; 5+ messages in thread
From: Wyes Karny @ 2023-05-30 11:16 UTC (permalink / raw)
To: stable; +Cc: Gautham R. Shenoy, Wyes Karny, Rafael J . Wysocki
From: "Gautham R. Shenoy" <gautham.shenoy@amd.com>
[ Upstream commit 3bf8c6307bad5c0cc09cde982e146d847859b651 ]
Schedutil normally calls the adjust_perf callback for drivers with
adjust_perf callback available and fast_switch_possible flag set.
However, when frequency invariance is disabled and schedutil tries to
invoke fast_switch. So, there is a chance of kernel crash if this
function pointer is not set. To protect against this scenario add
fast_switch callback to amd_pstate driver.
Fixes: 1d215f0319c2 ("cpufreq: amd-pstate: Add fast switch function for AMD P-State")
Signed-off-by: Gautham R. Shenoy <gautham.shenoy@amd.com>
Signed-off-by: Wyes Karny <wyes.karny@amd.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
(cherry picked from commit 4badf2eb1e986bdbf34dd2f5d4c979553a86fe54)
---
drivers/cpufreq/amd-pstate.c | 37 +++++++++++++++++++++++++++++-------
1 file changed, 30 insertions(+), 7 deletions(-)
diff --git a/drivers/cpufreq/amd-pstate.c b/drivers/cpufreq/amd-pstate.c
index 8dd46fad151e..7cce90d16b8d 100644
--- a/drivers/cpufreq/amd-pstate.c
+++ b/drivers/cpufreq/amd-pstate.c
@@ -422,9 +422,8 @@ static int amd_pstate_verify(struct cpufreq_policy_data *policy)
return 0;
}
-static int amd_pstate_target(struct cpufreq_policy *policy,
- unsigned int target_freq,
- unsigned int relation)
+static int amd_pstate_update_freq(struct cpufreq_policy *policy,
+ unsigned int target_freq, bool fast_switch)
{
struct cpufreq_freqs freqs;
struct amd_cpudata *cpudata = policy->driver_data;
@@ -443,14 +442,36 @@ static int amd_pstate_target(struct cpufreq_policy *policy,
des_perf = DIV_ROUND_CLOSEST(target_freq * cap_perf,
cpudata->max_freq);
- cpufreq_freq_transition_begin(policy, &freqs);
- amd_pstate_update(cpudata, min_perf, des_perf,
- max_perf, false);
- cpufreq_freq_transition_end(policy, &freqs, false);
+ WARN_ON(fast_switch && !policy->fast_switch_enabled);
+ /*
+ * If fast_switch is desired, then there aren't any registered
+ * transition notifiers. See comment for
+ * cpufreq_enable_fast_switch().
+ */
+ if (!fast_switch)
+ cpufreq_freq_transition_begin(policy, &freqs);
+
+ amd_pstate_update(cpudata, min_perf, des_perf, max_perf, fast_switch);
+
+ if (!fast_switch)
+ cpufreq_freq_transition_end(policy, &freqs, false);
return 0;
}
+static int amd_pstate_target(struct cpufreq_policy *policy,
+ unsigned int target_freq,
+ unsigned int relation)
+{
+ return amd_pstate_update_freq(policy, target_freq, false);
+}
+
+static unsigned int amd_pstate_fast_switch(struct cpufreq_policy *policy,
+ unsigned int target_freq)
+{
+ return amd_pstate_update_freq(policy, target_freq, true);
+}
+
static void amd_pstate_adjust_perf(unsigned int cpu,
unsigned long _min_perf,
unsigned long target_perf,
@@ -692,6 +713,7 @@ static int amd_pstate_cpu_exit(struct cpufreq_policy *policy)
freq_qos_remove_request(&cpudata->req[1]);
freq_qos_remove_request(&cpudata->req[0]);
+ policy->fast_switch_possible = false;
kfree(cpudata);
return 0;
@@ -1226,6 +1248,7 @@ static struct cpufreq_driver amd_pstate_driver = {
.flags = CPUFREQ_CONST_LOOPS | CPUFREQ_NEED_UPDATE_LIMITS,
.verify = amd_pstate_verify,
.target = amd_pstate_target,
+ .fast_switch = amd_pstate_fast_switch,
.init = amd_pstate_cpu_init,
.exit = amd_pstate_cpu_exit,
.suspend = amd_pstate_cpu_suspend,
--
2.34.1
^ permalink raw reply related [flat|nested] 5+ messages in thread* Re: [PATCH 6.3.y] cpufreq: amd-pstate: Add ->fast_switch() callback
2023-05-30 11:16 ` [PATCH 6.3.y] cpufreq: amd-pstate: Add ->fast_switch() callback Wyes Karny
@ 2023-05-30 11:28 ` Wyes Karny
0 siblings, 0 replies; 5+ messages in thread
From: Wyes Karny @ 2023-05-30 11:28 UTC (permalink / raw)
To: stable; +Cc: Gautham R. Shenoy, Rafael J . Wysocki
On 30 May 11:16, Wyes Karny wrote:
> From: "Gautham R. Shenoy" <gautham.shenoy@amd.com>
>
> [ Upstream commit 3bf8c6307bad5c0cc09cde982e146d847859b651 ]
>
> Schedutil normally calls the adjust_perf callback for drivers with
> adjust_perf callback available and fast_switch_possible flag set.
> However, when frequency invariance is disabled and schedutil tries to
> invoke fast_switch. So, there is a chance of kernel crash if this
> function pointer is not set. To protect against this scenario add
> fast_switch callback to amd_pstate driver.
>
> Fixes: 1d215f0319c2 ("cpufreq: amd-pstate: Add fast switch function for AMD P-State")
> Signed-off-by: Gautham R. Shenoy <gautham.shenoy@amd.com>
> Signed-off-by: Wyes Karny <wyes.karny@amd.com>
> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
> (cherry picked from commit 4badf2eb1e986bdbf34dd2f5d4c979553a86fe54)
> ---
> drivers/cpufreq/amd-pstate.c | 37 +++++++++++++++++++++++++++++-------
> 1 file changed, 30 insertions(+), 7 deletions(-)
>
> diff --git a/drivers/cpufreq/amd-pstate.c b/drivers/cpufreq/amd-pstate.c
> index 8dd46fad151e..7cce90d16b8d 100644
> --- a/drivers/cpufreq/amd-pstate.c
> +++ b/drivers/cpufreq/amd-pstate.c
> @@ -422,9 +422,8 @@ static int amd_pstate_verify(struct cpufreq_policy_data *policy)
> return 0;
> }
>
> -static int amd_pstate_target(struct cpufreq_policy *policy,
> - unsigned int target_freq,
> - unsigned int relation)
> +static int amd_pstate_update_freq(struct cpufreq_policy *policy,
> + unsigned int target_freq, bool fast_switch)
> {
> struct cpufreq_freqs freqs;
> struct amd_cpudata *cpudata = policy->driver_data;
> @@ -443,14 +442,36 @@ static int amd_pstate_target(struct cpufreq_policy *policy,
> des_perf = DIV_ROUND_CLOSEST(target_freq * cap_perf,
> cpudata->max_freq);
>
> - cpufreq_freq_transition_begin(policy, &freqs);
> - amd_pstate_update(cpudata, min_perf, des_perf,
> - max_perf, false);
> - cpufreq_freq_transition_end(policy, &freqs, false);
> + WARN_ON(fast_switch && !policy->fast_switch_enabled);
> + /*
> + * If fast_switch is desired, then there aren't any registered
> + * transition notifiers. See comment for
> + * cpufreq_enable_fast_switch().
> + */
> + if (!fast_switch)
> + cpufreq_freq_transition_begin(policy, &freqs);
> +
> + amd_pstate_update(cpudata, min_perf, des_perf, max_perf, fast_switch);
> +
> + if (!fast_switch)
> + cpufreq_freq_transition_end(policy, &freqs, false);
>
> return 0;
> }
>
> +static int amd_pstate_target(struct cpufreq_policy *policy,
> + unsigned int target_freq,
> + unsigned int relation)
> +{
> + return amd_pstate_update_freq(policy, target_freq, false);
> +}
> +
> +static unsigned int amd_pstate_fast_switch(struct cpufreq_policy *policy,
> + unsigned int target_freq)
> +{
> + return amd_pstate_update_freq(policy, target_freq, true);
> +}
> +
> static void amd_pstate_adjust_perf(unsigned int cpu,
> unsigned long _min_perf,
> unsigned long target_perf,
> @@ -692,6 +713,7 @@ static int amd_pstate_cpu_exit(struct cpufreq_policy *policy)
>
> freq_qos_remove_request(&cpudata->req[1]);
> freq_qos_remove_request(&cpudata->req[0]);
> + policy->fast_switch_possible = false;
> kfree(cpudata);
>
> return 0;
> @@ -1226,6 +1248,7 @@ static struct cpufreq_driver amd_pstate_driver = {
> .flags = CPUFREQ_CONST_LOOPS | CPUFREQ_NEED_UPDATE_LIMITS,
> .verify = amd_pstate_verify,
> .target = amd_pstate_target,
> + .fast_switch = amd_pstate_fast_switch,
> .init = amd_pstate_cpu_init,
> .exit = amd_pstate_cpu_exit,
> .suspend = amd_pstate_cpu_suspend,
Please ignore this. Wrong patch.
Sorry for inconvenience.
Thanks,
Wyes
> --
> 2.34.1
>
^ permalink raw reply [flat|nested] 5+ messages in thread
* [PATCH 6.3.y] cpufreq: amd-pstate: Update policy->cur in amd_pstate_adjust_perf()
2023-05-28 16:54 FAILED: patch "[PATCH] cpufreq: amd-pstate: Update policy->cur in" failed to apply to 6.3-stable tree gregkh
2023-05-30 11:16 ` [PATCH 6.3.y] cpufreq: amd-pstate: Add ->fast_switch() callback Wyes Karny
@ 2023-05-30 12:01 ` Wyes Karny
1 sibling, 0 replies; 5+ messages in thread
From: Wyes Karny @ 2023-05-30 12:01 UTC (permalink / raw)
To: stable; +Cc: Wyes Karny, Rafael J . Wysocki
[ Upstream commit 3bf8c6307bad5c0cc09cde982e146d847859b651 ]
Driver should update policy->cur after updating the frequency.
Currently amd_pstate doesn't update policy->cur when `adjust_perf`
is used. Which causes /proc/cpuinfo to show wrong cpu frequency.
Fix this by updating policy->cur with correct frequency value in
adjust_perf function callback.
- Before the fix: (setting min freq to 1.5 MHz)
[root@amd]# cat /proc/cpuinfo | grep "cpu MHz" | sort | uniq --count
1 cpu MHz : 1777.016
1 cpu MHz : 1797.160
1 cpu MHz : 1797.270
189 cpu MHz : 400.000
- After the fix: (setting min freq to 1.5 MHz)
[root@amd]# cat /proc/cpuinfo | grep "cpu MHz" | sort | uniq --count
1 cpu MHz : 1753.353
1 cpu MHz : 1756.838
1 cpu MHz : 1776.466
1 cpu MHz : 1776.873
1 cpu MHz : 1777.308
1 cpu MHz : 1779.900
183 cpu MHz : 1805.231
1 cpu MHz : 1956.815
1 cpu MHz : 2246.203
1 cpu MHz : 2259.984
Fixes: 1d215f0319c2 ("cpufreq: amd-pstate: Add fast switch function for AMD P-State")
Signed-off-by: Wyes Karny <wyes.karny@amd.com>
[ rjw: Subject edits ]
Cc: 5.17+ <stable@vger.kernel.org> # 5.17+
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
(cherry picked from commit 3bf8c6307bad5c0cc09cde982e146d847859b651)
---
drivers/cpufreq/amd-pstate.c | 8 +++++++-
1 file changed, 7 insertions(+), 1 deletion(-)
diff --git a/drivers/cpufreq/amd-pstate.c b/drivers/cpufreq/amd-pstate.c
index 8dd46fad151e..497bde9cb213 100644
--- a/drivers/cpufreq/amd-pstate.c
+++ b/drivers/cpufreq/amd-pstate.c
@@ -457,12 +457,14 @@ static void amd_pstate_adjust_perf(unsigned int cpu,
unsigned long capacity)
{
unsigned long max_perf, min_perf, des_perf,
- cap_perf, lowest_nonlinear_perf;
+ cap_perf, lowest_nonlinear_perf, max_freq;
struct cpufreq_policy *policy = cpufreq_cpu_get(cpu);
struct amd_cpudata *cpudata = policy->driver_data;
+ unsigned int target_freq;
cap_perf = READ_ONCE(cpudata->highest_perf);
lowest_nonlinear_perf = READ_ONCE(cpudata->lowest_nonlinear_perf);
+ max_freq = READ_ONCE(cpudata->max_freq);
des_perf = cap_perf;
if (target_perf < capacity)
@@ -479,6 +481,10 @@ static void amd_pstate_adjust_perf(unsigned int cpu,
if (max_perf < min_perf)
max_perf = min_perf;
+ des_perf = clamp_t(unsigned long, des_perf, min_perf, max_perf);
+ target_freq = div_u64(des_perf * max_freq, max_perf);
+ policy->cur = target_freq;
+
amd_pstate_update(cpudata, min_perf, des_perf, max_perf, true);
cpufreq_cpu_put(policy);
}
--
2.34.1
^ permalink raw reply related [flat|nested] 5+ messages in thread
* FAILED: patch "[PATCH] cpufreq: amd-pstate: Update policy->cur in" failed to apply to 6.3-stable tree
@ 2023-05-28 7:27 gregkh
0 siblings, 0 replies; 5+ messages in thread
From: gregkh @ 2023-05-28 7:27 UTC (permalink / raw)
To: wyes.karny, rafael.j.wysocki, stable; +Cc: stable
The patch below does not apply to the 6.3-stable tree.
If someone wants it applied there, or to any other stable or longterm
tree, then please email the backport, including the original git commit
id to <stable@vger.kernel.org>.
To reproduce the conflict and resubmit, you may use the following commands:
git fetch https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/ linux-6.3.y
git checkout FETCH_HEAD
git cherry-pick -x 3bf8c6307bad5c0cc09cde982e146d847859b651
# <resolve conflicts, build, test, etc.>
git commit -s
git send-email --to '<stable@vger.kernel.org>' --in-reply-to '2023052831-chest-shabby-7961@gregkh' --subject-prefix 'PATCH 6.3.y' HEAD^..
Possible dependencies:
3bf8c6307bad ("cpufreq: amd-pstate: Update policy->cur in amd_pstate_adjust_perf()")
2dd6d0ebf740 ("cpufreq: amd-pstate: Add guided autonomous mode")
3e6e07805764 ("Documentation: cpufreq: amd-pstate: Move amd_pstate param to alphabetical order")
thanks,
greg k-h
------------------ original commit in Linus's tree ------------------
From 3bf8c6307bad5c0cc09cde982e146d847859b651 Mon Sep 17 00:00:00 2001
From: Wyes Karny <wyes.karny@amd.com>
Date: Thu, 18 May 2023 05:58:19 +0000
Subject: [PATCH] cpufreq: amd-pstate: Update policy->cur in
amd_pstate_adjust_perf()
Driver should update policy->cur after updating the frequency.
Currently amd_pstate doesn't update policy->cur when `adjust_perf`
is used. Which causes /proc/cpuinfo to show wrong cpu frequency.
Fix this by updating policy->cur with correct frequency value in
adjust_perf function callback.
- Before the fix: (setting min freq to 1.5 MHz)
[root@amd]# cat /proc/cpuinfo | grep "cpu MHz" | sort | uniq --count
1 cpu MHz : 1777.016
1 cpu MHz : 1797.160
1 cpu MHz : 1797.270
189 cpu MHz : 400.000
- After the fix: (setting min freq to 1.5 MHz)
[root@amd]# cat /proc/cpuinfo | grep "cpu MHz" | sort | uniq --count
1 cpu MHz : 1753.353
1 cpu MHz : 1756.838
1 cpu MHz : 1776.466
1 cpu MHz : 1776.873
1 cpu MHz : 1777.308
1 cpu MHz : 1779.900
183 cpu MHz : 1805.231
1 cpu MHz : 1956.815
1 cpu MHz : 2246.203
1 cpu MHz : 2259.984
Fixes: 1d215f0319c2 ("cpufreq: amd-pstate: Add fast switch function for AMD P-State")
Signed-off-by: Wyes Karny <wyes.karny@amd.com>
[ rjw: Subject edits ]
Cc: 5.17+ <stable@vger.kernel.org> # 5.17+
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
diff --git a/drivers/cpufreq/amd-pstate.c b/drivers/cpufreq/amd-pstate.c
index ac54779f5a49..ddd346a239e0 100644
--- a/drivers/cpufreq/amd-pstate.c
+++ b/drivers/cpufreq/amd-pstate.c
@@ -501,12 +501,14 @@ static void amd_pstate_adjust_perf(unsigned int cpu,
unsigned long capacity)
{
unsigned long max_perf, min_perf, des_perf,
- cap_perf, lowest_nonlinear_perf;
+ cap_perf, lowest_nonlinear_perf, max_freq;
struct cpufreq_policy *policy = cpufreq_cpu_get(cpu);
struct amd_cpudata *cpudata = policy->driver_data;
+ unsigned int target_freq;
cap_perf = READ_ONCE(cpudata->highest_perf);
lowest_nonlinear_perf = READ_ONCE(cpudata->lowest_nonlinear_perf);
+ max_freq = READ_ONCE(cpudata->max_freq);
des_perf = cap_perf;
if (target_perf < capacity)
@@ -523,6 +525,10 @@ static void amd_pstate_adjust_perf(unsigned int cpu,
if (max_perf < min_perf)
max_perf = min_perf;
+ des_perf = clamp_t(unsigned long, des_perf, min_perf, max_perf);
+ target_freq = div_u64(des_perf * max_freq, max_perf);
+ policy->cur = target_freq;
+
amd_pstate_update(cpudata, min_perf, des_perf, max_perf, true,
policy->governor->flags);
cpufreq_cpu_put(policy);
^ permalink raw reply related [flat|nested] 5+ messages in thread
end of thread, other threads:[~2023-05-30 12:01 UTC | newest]
Thread overview: 5+ messages (download: mbox.gz follow: Atom feed
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2023-05-28 16:54 FAILED: patch "[PATCH] cpufreq: amd-pstate: Update policy->cur in" failed to apply to 6.3-stable tree gregkh
2023-05-30 11:16 ` [PATCH 6.3.y] cpufreq: amd-pstate: Add ->fast_switch() callback Wyes Karny
2023-05-30 11:28 ` Wyes Karny
2023-05-30 12:01 ` [PATCH 6.3.y] cpufreq: amd-pstate: Update policy->cur in amd_pstate_adjust_perf() Wyes Karny
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