* [RFC] perf/x86/intel: Export mem events only if there's PEBs support
@ 2018-08-13 15:48 Jiri Olsa
2018-08-13 18:58 ` Andi Kleen
2018-08-27 9:06 ` [PATCH] " Jiri Olsa
0 siblings, 2 replies; 8+ messages in thread
From: Jiri Olsa @ 2018-08-13 15:48 UTC (permalink / raw)
To: Peter Zijlstra
Cc: lkml, Ingo Molnar, Alexander Shishkin, Michael Petlan,
Arnaldo Carvalho de Melo, Andi Kleen
hi,
we had some reports that we show mem* events on KVM servers
where they are not available, this patch hides them if there's
no PEBs available
currently on those servers we fail to open mem* events,
because we can't access LDLAT msr
however that's not so easy/straight forward to check,
so I thought we could use check on PEBs instead, which
needs to be there for mem events as well and seems to
be enough to check
thoughts? thanks,
jirka
---
Memory events depends on PEBs support and access to LDLAT msr,
but we display them in /sys/devices/cpu/events even if the cpu
does not provide those, like for KVM guests.
That brings the false assumption that those events should
be available, while they fail event to open.
Separating the mem-* events attributes and merging them
with cpu_events only if there's PEBs support detected.
We could also check if LDLAT msr is available, but the
PEBs check seems to cover the need now.
Signed-off-by: Jiri Olsa <jolsa@kernel.org>
---
arch/x86/events/core.c | 8 +++---
arch/x86/events/intel/core.c | 54 ++++++++++++++++++++++++++----------
2 files changed, 44 insertions(+), 18 deletions(-)
diff --git a/arch/x86/events/core.c b/arch/x86/events/core.c
index 5f4829f10129..1a17004f6559 100644
--- a/arch/x86/events/core.c
+++ b/arch/x86/events/core.c
@@ -1631,9 +1631,9 @@ __init struct attribute **merge_attr(struct attribute **a, struct attribute **b)
struct attribute **new;
int j, i;
- for (j = 0; a[j]; j++)
+ for (j = 0; a && a[j]; j++)
;
- for (i = 0; b[i]; i++)
+ for (i = 0; b && b[i]; i++)
j++;
j++;
@@ -1642,9 +1642,9 @@ __init struct attribute **merge_attr(struct attribute **a, struct attribute **b)
return NULL;
j = 0;
- for (i = 0; a[i]; i++)
+ for (i = 0; a && a[i]; i++)
new[j++] = a[i];
- for (i = 0; b[i]; i++)
+ for (i = 0; b && b[i]; i++)
new[j++] = b[i];
new[j] = NULL;
diff --git a/arch/x86/events/intel/core.c b/arch/x86/events/intel/core.c
index 035c37481f57..04d077177e3c 100644
--- a/arch/x86/events/intel/core.c
+++ b/arch/x86/events/intel/core.c
@@ -242,7 +242,7 @@ EVENT_ATTR_STR(mem-loads, mem_ld_nhm, "event=0x0b,umask=0x10,ldlat=3");
EVENT_ATTR_STR(mem-loads, mem_ld_snb, "event=0xcd,umask=0x1,ldlat=3");
EVENT_ATTR_STR(mem-stores, mem_st_snb, "event=0xcd,umask=0x2");
-static struct attribute *nhm_events_attrs[] = {
+static struct attribute *nhm_mem_events_attrs[] = {
EVENT_PTR(mem_ld_nhm),
NULL,
};
@@ -278,8 +278,6 @@ EVENT_ATTR_STR_HT(topdown-recovery-bubbles.scale, td_recovery_bubbles_scale,
"4", "2");
static struct attribute *snb_events_attrs[] = {
- EVENT_PTR(mem_ld_snb),
- EVENT_PTR(mem_st_snb),
EVENT_PTR(td_slots_issued),
EVENT_PTR(td_slots_retired),
EVENT_PTR(td_fetch_bubbles),
@@ -290,6 +288,12 @@ static struct attribute *snb_events_attrs[] = {
NULL,
};
+static struct attribute *snb_mem_events_attrs[] = {
+ EVENT_PTR(mem_ld_snb),
+ EVENT_PTR(mem_st_snb),
+ NULL,
+};
+
static struct event_constraint intel_hsw_event_constraints[] = {
FIXED_EVENT_CONSTRAINT(0x00c0, 0), /* INST_RETIRED.ANY */
FIXED_EVENT_CONSTRAINT(0x003c, 1), /* CPU_CLK_UNHALTED.CORE */
@@ -3764,8 +3768,6 @@ EVENT_ATTR_STR(cycles-t, cycles_t, "event=0x3c,in_tx=1");
EVENT_ATTR_STR(cycles-ct, cycles_ct, "event=0x3c,in_tx=1,in_tx_cp=1");
static struct attribute *hsw_events_attrs[] = {
- EVENT_PTR(mem_ld_hsw),
- EVENT_PTR(mem_st_hsw),
EVENT_PTR(td_slots_issued),
EVENT_PTR(td_slots_retired),
EVENT_PTR(td_fetch_bubbles),
@@ -3776,6 +3778,12 @@ static struct attribute *hsw_events_attrs[] = {
NULL
};
+static struct attribute *hsw_mem_events_attrs[] = {
+ EVENT_PTR(mem_ld_hsw),
+ EVENT_PTR(mem_st_hsw),
+ NULL,
+};
+
static struct attribute *hsw_tsx_events_attrs[] = {
EVENT_PTR(tx_start),
EVENT_PTR(tx_commit),
@@ -3792,11 +3800,13 @@ static struct attribute *hsw_tsx_events_attrs[] = {
NULL
};
-static __init struct attribute **get_hsw_events_attrs(void)
+static __init struct attribute **get_hsw_events_attrs(bool *alloc)
{
- return boot_cpu_has(X86_FEATURE_RTM) ?
- merge_attr(hsw_events_attrs, hsw_tsx_events_attrs) :
- hsw_events_attrs;
+ if (boot_cpu_has(X86_FEATURE_RTM)) {
+ *alloc = true;
+ return merge_attr(hsw_events_attrs, hsw_tsx_events_attrs);
+ }
+ return hsw_events_attrs;
}
static ssize_t freeze_on_smi_show(struct device *cdev,
@@ -3878,7 +3888,9 @@ static struct attribute *intel_pmu_attrs[] = {
__init int intel_pmu_init(void)
{
struct attribute **extra_attr = NULL;
+ struct attribute **mem_attr = NULL;
struct attribute **to_free = NULL;
+ bool alloc_events = false;
union cpuid10_edx edx;
union cpuid10_eax eax;
union cpuid10_ebx ebx;
@@ -3986,7 +3998,7 @@ __init int intel_pmu_init(void)
x86_pmu.enable_all = intel_pmu_nhm_enable_all;
x86_pmu.extra_regs = intel_nehalem_extra_regs;
- x86_pmu.cpu_events = nhm_events_attrs;
+ mem_attr = nhm_mem_events_attrs;
/* UOPS_ISSUED.STALLED_CYCLES */
intel_perfmon_event_map[PERF_COUNT_HW_STALLED_CYCLES_FRONTEND] =
@@ -4112,7 +4124,7 @@ __init int intel_pmu_init(void)
x86_pmu.extra_regs = intel_westmere_extra_regs;
x86_pmu.flags |= PMU_FL_HAS_RSP_1;
- x86_pmu.cpu_events = nhm_events_attrs;
+ mem_attr = nhm_mem_events_attrs;
/* UOPS_ISSUED.STALLED_CYCLES */
intel_perfmon_event_map[PERF_COUNT_HW_STALLED_CYCLES_FRONTEND] =
@@ -4152,6 +4164,7 @@ __init int intel_pmu_init(void)
x86_pmu.flags |= PMU_FL_NO_HT_SHARING;
x86_pmu.cpu_events = snb_events_attrs;
+ mem_attr = snb_mem_events_attrs;
/* UOPS_ISSUED.ANY,c=1,i=1 to count stall cycles */
intel_perfmon_event_map[PERF_COUNT_HW_STALLED_CYCLES_FRONTEND] =
@@ -4192,6 +4205,7 @@ __init int intel_pmu_init(void)
x86_pmu.flags |= PMU_FL_NO_HT_SHARING;
x86_pmu.cpu_events = snb_events_attrs;
+ mem_attr = snb_mem_events_attrs;
/* UOPS_ISSUED.ANY,c=1,i=1 to count stall cycles */
intel_perfmon_event_map[PERF_COUNT_HW_STALLED_CYCLES_FRONTEND] =
@@ -4226,10 +4240,11 @@ __init int intel_pmu_init(void)
x86_pmu.hw_config = hsw_hw_config;
x86_pmu.get_event_constraints = hsw_get_event_constraints;
- x86_pmu.cpu_events = get_hsw_events_attrs();
+ x86_pmu.cpu_events = get_hsw_events_attrs(&alloc_events);
x86_pmu.lbr_double_abort = true;
extra_attr = boot_cpu_has(X86_FEATURE_RTM) ?
hsw_format_attr : nhm_format_attr;
+ mem_attr = hsw_mem_events_attrs;
pr_cont("Haswell events, ");
name = "haswell";
break;
@@ -4265,10 +4280,11 @@ __init int intel_pmu_init(void)
x86_pmu.hw_config = hsw_hw_config;
x86_pmu.get_event_constraints = hsw_get_event_constraints;
- x86_pmu.cpu_events = get_hsw_events_attrs();
+ x86_pmu.cpu_events = get_hsw_events_attrs(&alloc_events);
x86_pmu.limit_period = bdw_limit_period;
extra_attr = boot_cpu_has(X86_FEATURE_RTM) ?
hsw_format_attr : nhm_format_attr;
+ mem_attr = hsw_mem_events_attrs;
pr_cont("Broadwell events, ");
name = "broadwell";
break;
@@ -4324,7 +4340,8 @@ __init int intel_pmu_init(void)
hsw_format_attr : nhm_format_attr;
extra_attr = merge_attr(extra_attr, skl_format_attr);
to_free = extra_attr;
- x86_pmu.cpu_events = get_hsw_events_attrs();
+ x86_pmu.cpu_events = get_hsw_events_attrs(&alloc_events);
+ mem_attr = hsw_mem_events_attrs;
intel_pmu_pebs_data_source_skl(
boot_cpu_data.x86_model == INTEL_FAM6_SKYLAKE_X);
pr_cont("Skylake events, ");
@@ -4357,6 +4374,15 @@ __init int intel_pmu_init(void)
WARN_ON(!x86_pmu.format_attrs);
}
+ if (x86_pmu.pebs && mem_attr) {
+ struct attribute **attr = x86_pmu.cpu_events;
+
+ x86_pmu.cpu_events = merge_attr(x86_pmu.cpu_events, mem_attr);
+
+ if (alloc_events)
+ kfree(attr);
+ }
+
if (x86_pmu.num_counters > INTEL_PMC_MAX_GENERIC) {
WARN(1, KERN_ERR "hw perf events %d > max(%d), clipping!",
x86_pmu.num_counters, INTEL_PMC_MAX_GENERIC);
--
2.17.1
^ permalink raw reply related [flat|nested] 8+ messages in thread
* Re: [RFC] perf/x86/intel: Export mem events only if there's PEBs support
2018-08-13 15:48 [RFC] perf/x86/intel: Export mem events only if there's PEBs support Jiri Olsa
@ 2018-08-13 18:58 ` Andi Kleen
2018-08-27 9:06 ` [PATCH] " Jiri Olsa
1 sibling, 0 replies; 8+ messages in thread
From: Andi Kleen @ 2018-08-13 18:58 UTC (permalink / raw)
To: Jiri Olsa
Cc: Peter Zijlstra, lkml, Ingo Molnar, Alexander Shishkin,
Michael Petlan, Arnaldo Carvalho de Melo
On Mon, Aug 13, 2018 at 05:48:20PM +0200, Jiri Olsa wrote:
> hi,
> we had some reports that we show mem* events on KVM servers
> where they are not available, this patch hides them if there's
> no PEBs available
>
> currently on those servers we fail to open mem* events,
> because we can't access LDLAT msr
>
> however that's not so easy/straight forward to check,
> so I thought we could use check on PEBs instead, which
> needs to be there for mem events as well and seems to
> be enough to check
>
> thoughts? thanks,
> jirka
Acked-by: Andi Kleen <ak@linux.intel.com>
-Andi
^ permalink raw reply [flat|nested] 8+ messages in thread
* [PATCH] perf/x86/intel: Export mem events only if there's PEBs support
2018-08-13 15:48 [RFC] perf/x86/intel: Export mem events only if there's PEBs support Jiri Olsa
2018-08-13 18:58 ` Andi Kleen
@ 2018-08-27 9:06 ` Jiri Olsa
2018-08-28 8:12 ` Peter Zijlstra
1 sibling, 1 reply; 8+ messages in thread
From: Jiri Olsa @ 2018-08-27 9:06 UTC (permalink / raw)
To: Jiri Olsa
Cc: Peter Zijlstra, lkml, Ingo Molnar, Alexander Shishkin,
Michael Petlan, Arnaldo Carvalho de Melo, Andi Kleen
Memory events depends on PEBs support and access to LDLAT msr,
but we display them in /sys/devices/cpu/events even if the cpu
does not provide those, like for KVM guests.
That brings the false assumption that those events should
be available, while they fail event to open.
Separating the mem-* events attributes and merging them
with cpu_events only if there's PEBs support detected.
We could also check if LDLAT msr is available, but the
PEBs check seems to cover the need now.
Acked-by: Andi Kleen <ak@linux.intel.com>
Signed-off-by: Jiri Olsa <jolsa@kernel.org>
---
arch/x86/events/core.c | 8 +++---
arch/x86/events/intel/core.c | 54 ++++++++++++++++++++++++++----------
2 files changed, 44 insertions(+), 18 deletions(-)
diff --git a/arch/x86/events/core.c b/arch/x86/events/core.c
index 5f4829f10129..1a17004f6559 100644
--- a/arch/x86/events/core.c
+++ b/arch/x86/events/core.c
@@ -1631,9 +1631,9 @@ __init struct attribute **merge_attr(struct attribute **a, struct attribute **b)
struct attribute **new;
int j, i;
- for (j = 0; a[j]; j++)
+ for (j = 0; a && a[j]; j++)
;
- for (i = 0; b[i]; i++)
+ for (i = 0; b && b[i]; i++)
j++;
j++;
@@ -1642,9 +1642,9 @@ __init struct attribute **merge_attr(struct attribute **a, struct attribute **b)
return NULL;
j = 0;
- for (i = 0; a[i]; i++)
+ for (i = 0; a && a[i]; i++)
new[j++] = a[i];
- for (i = 0; b[i]; i++)
+ for (i = 0; b && b[i]; i++)
new[j++] = b[i];
new[j] = NULL;
diff --git a/arch/x86/events/intel/core.c b/arch/x86/events/intel/core.c
index 035c37481f57..04d077177e3c 100644
--- a/arch/x86/events/intel/core.c
+++ b/arch/x86/events/intel/core.c
@@ -242,7 +242,7 @@ EVENT_ATTR_STR(mem-loads, mem_ld_nhm, "event=0x0b,umask=0x10,ldlat=3");
EVENT_ATTR_STR(mem-loads, mem_ld_snb, "event=0xcd,umask=0x1,ldlat=3");
EVENT_ATTR_STR(mem-stores, mem_st_snb, "event=0xcd,umask=0x2");
-static struct attribute *nhm_events_attrs[] = {
+static struct attribute *nhm_mem_events_attrs[] = {
EVENT_PTR(mem_ld_nhm),
NULL,
};
@@ -278,8 +278,6 @@ EVENT_ATTR_STR_HT(topdown-recovery-bubbles.scale, td_recovery_bubbles_scale,
"4", "2");
static struct attribute *snb_events_attrs[] = {
- EVENT_PTR(mem_ld_snb),
- EVENT_PTR(mem_st_snb),
EVENT_PTR(td_slots_issued),
EVENT_PTR(td_slots_retired),
EVENT_PTR(td_fetch_bubbles),
@@ -290,6 +288,12 @@ static struct attribute *snb_events_attrs[] = {
NULL,
};
+static struct attribute *snb_mem_events_attrs[] = {
+ EVENT_PTR(mem_ld_snb),
+ EVENT_PTR(mem_st_snb),
+ NULL,
+};
+
static struct event_constraint intel_hsw_event_constraints[] = {
FIXED_EVENT_CONSTRAINT(0x00c0, 0), /* INST_RETIRED.ANY */
FIXED_EVENT_CONSTRAINT(0x003c, 1), /* CPU_CLK_UNHALTED.CORE */
@@ -3764,8 +3768,6 @@ EVENT_ATTR_STR(cycles-t, cycles_t, "event=0x3c,in_tx=1");
EVENT_ATTR_STR(cycles-ct, cycles_ct, "event=0x3c,in_tx=1,in_tx_cp=1");
static struct attribute *hsw_events_attrs[] = {
- EVENT_PTR(mem_ld_hsw),
- EVENT_PTR(mem_st_hsw),
EVENT_PTR(td_slots_issued),
EVENT_PTR(td_slots_retired),
EVENT_PTR(td_fetch_bubbles),
@@ -3776,6 +3778,12 @@ static struct attribute *hsw_events_attrs[] = {
NULL
};
+static struct attribute *hsw_mem_events_attrs[] = {
+ EVENT_PTR(mem_ld_hsw),
+ EVENT_PTR(mem_st_hsw),
+ NULL,
+};
+
static struct attribute *hsw_tsx_events_attrs[] = {
EVENT_PTR(tx_start),
EVENT_PTR(tx_commit),
@@ -3792,11 +3800,13 @@ static struct attribute *hsw_tsx_events_attrs[] = {
NULL
};
-static __init struct attribute **get_hsw_events_attrs(void)
+static __init struct attribute **get_hsw_events_attrs(bool *alloc)
{
- return boot_cpu_has(X86_FEATURE_RTM) ?
- merge_attr(hsw_events_attrs, hsw_tsx_events_attrs) :
- hsw_events_attrs;
+ if (boot_cpu_has(X86_FEATURE_RTM)) {
+ *alloc = true;
+ return merge_attr(hsw_events_attrs, hsw_tsx_events_attrs);
+ }
+ return hsw_events_attrs;
}
static ssize_t freeze_on_smi_show(struct device *cdev,
@@ -3878,7 +3888,9 @@ static struct attribute *intel_pmu_attrs[] = {
__init int intel_pmu_init(void)
{
struct attribute **extra_attr = NULL;
+ struct attribute **mem_attr = NULL;
struct attribute **to_free = NULL;
+ bool alloc_events = false;
union cpuid10_edx edx;
union cpuid10_eax eax;
union cpuid10_ebx ebx;
@@ -3986,7 +3998,7 @@ __init int intel_pmu_init(void)
x86_pmu.enable_all = intel_pmu_nhm_enable_all;
x86_pmu.extra_regs = intel_nehalem_extra_regs;
- x86_pmu.cpu_events = nhm_events_attrs;
+ mem_attr = nhm_mem_events_attrs;
/* UOPS_ISSUED.STALLED_CYCLES */
intel_perfmon_event_map[PERF_COUNT_HW_STALLED_CYCLES_FRONTEND] =
@@ -4112,7 +4124,7 @@ __init int intel_pmu_init(void)
x86_pmu.extra_regs = intel_westmere_extra_regs;
x86_pmu.flags |= PMU_FL_HAS_RSP_1;
- x86_pmu.cpu_events = nhm_events_attrs;
+ mem_attr = nhm_mem_events_attrs;
/* UOPS_ISSUED.STALLED_CYCLES */
intel_perfmon_event_map[PERF_COUNT_HW_STALLED_CYCLES_FRONTEND] =
@@ -4152,6 +4164,7 @@ __init int intel_pmu_init(void)
x86_pmu.flags |= PMU_FL_NO_HT_SHARING;
x86_pmu.cpu_events = snb_events_attrs;
+ mem_attr = snb_mem_events_attrs;
/* UOPS_ISSUED.ANY,c=1,i=1 to count stall cycles */
intel_perfmon_event_map[PERF_COUNT_HW_STALLED_CYCLES_FRONTEND] =
@@ -4192,6 +4205,7 @@ __init int intel_pmu_init(void)
x86_pmu.flags |= PMU_FL_NO_HT_SHARING;
x86_pmu.cpu_events = snb_events_attrs;
+ mem_attr = snb_mem_events_attrs;
/* UOPS_ISSUED.ANY,c=1,i=1 to count stall cycles */
intel_perfmon_event_map[PERF_COUNT_HW_STALLED_CYCLES_FRONTEND] =
@@ -4226,10 +4240,11 @@ __init int intel_pmu_init(void)
x86_pmu.hw_config = hsw_hw_config;
x86_pmu.get_event_constraints = hsw_get_event_constraints;
- x86_pmu.cpu_events = get_hsw_events_attrs();
+ x86_pmu.cpu_events = get_hsw_events_attrs(&alloc_events);
x86_pmu.lbr_double_abort = true;
extra_attr = boot_cpu_has(X86_FEATURE_RTM) ?
hsw_format_attr : nhm_format_attr;
+ mem_attr = hsw_mem_events_attrs;
pr_cont("Haswell events, ");
name = "haswell";
break;
@@ -4265,10 +4280,11 @@ __init int intel_pmu_init(void)
x86_pmu.hw_config = hsw_hw_config;
x86_pmu.get_event_constraints = hsw_get_event_constraints;
- x86_pmu.cpu_events = get_hsw_events_attrs();
+ x86_pmu.cpu_events = get_hsw_events_attrs(&alloc_events);
x86_pmu.limit_period = bdw_limit_period;
extra_attr = boot_cpu_has(X86_FEATURE_RTM) ?
hsw_format_attr : nhm_format_attr;
+ mem_attr = hsw_mem_events_attrs;
pr_cont("Broadwell events, ");
name = "broadwell";
break;
@@ -4324,7 +4340,8 @@ __init int intel_pmu_init(void)
hsw_format_attr : nhm_format_attr;
extra_attr = merge_attr(extra_attr, skl_format_attr);
to_free = extra_attr;
- x86_pmu.cpu_events = get_hsw_events_attrs();
+ x86_pmu.cpu_events = get_hsw_events_attrs(&alloc_events);
+ mem_attr = hsw_mem_events_attrs;
intel_pmu_pebs_data_source_skl(
boot_cpu_data.x86_model == INTEL_FAM6_SKYLAKE_X);
pr_cont("Skylake events, ");
@@ -4357,6 +4374,15 @@ __init int intel_pmu_init(void)
WARN_ON(!x86_pmu.format_attrs);
}
+ if (x86_pmu.pebs && mem_attr) {
+ struct attribute **attr = x86_pmu.cpu_events;
+
+ x86_pmu.cpu_events = merge_attr(x86_pmu.cpu_events, mem_attr);
+
+ if (alloc_events)
+ kfree(attr);
+ }
+
if (x86_pmu.num_counters > INTEL_PMC_MAX_GENERIC) {
WARN(1, KERN_ERR "hw perf events %d > max(%d), clipping!",
x86_pmu.num_counters, INTEL_PMC_MAX_GENERIC);
--
2.17.1
^ permalink raw reply related [flat|nested] 8+ messages in thread
* Re: [PATCH] perf/x86/intel: Export mem events only if there's PEBs support
2018-08-27 9:06 ` [PATCH] " Jiri Olsa
@ 2018-08-28 8:12 ` Peter Zijlstra
2018-08-28 8:19 ` Jiri Olsa
0 siblings, 1 reply; 8+ messages in thread
From: Peter Zijlstra @ 2018-08-28 8:12 UTC (permalink / raw)
To: Jiri Olsa
Cc: Jiri Olsa, lkml, Ingo Molnar, Alexander Shishkin, Michael Petlan,
Arnaldo Carvalho de Melo, Andi Kleen
On Mon, Aug 27, 2018 at 11:06:24AM +0200, Jiri Olsa wrote:
> +static __init struct attribute **get_hsw_events_attrs(bool *alloc)
> {
> + if (boot_cpu_has(X86_FEATURE_RTM)) {
> + *alloc = true;
> + return merge_attr(hsw_events_attrs, hsw_tsx_events_attrs);
> + }
> + return hsw_events_attrs;
> }
> @@ -4357,6 +4374,15 @@ __init int intel_pmu_init(void)
> WARN_ON(!x86_pmu.format_attrs);
> }
>
> + if (x86_pmu.pebs && mem_attr) {
> + struct attribute **attr = x86_pmu.cpu_events;
> +
> + x86_pmu.cpu_events = merge_attr(x86_pmu.cpu_events, mem_attr);
> +
> + if (alloc_events)
> + kfree(attr);
> + }
> +
> if (x86_pmu.num_counters > INTEL_PMC_MAX_GENERIC) {
> WARN(1, KERN_ERR "hw perf events %d > max(%d), clipping!",
> x86_pmu.num_counters, INTEL_PMC_MAX_GENERIC);
static __init struct attribute **
get_events_attrs(struct attribute **base,
struct attribute **mem,
struct attribute **tsx)
{
struct attribute **attrs = base;
struct attribute **old;
if (mem) {
old = attrs;
attrs = merge_attrs(attrs, mem);
if (old != base)
kfree(old);
}
if (tsx && boot_cpu_has(X86_FEATURE_RTM)) {
old = attrs;
attrs = merge_attrs(attrs, tsx);
if (old != base)
kfree(old);
}
return attrs;
}
Would that not help to concentrate things a little more?
^ permalink raw reply [flat|nested] 8+ messages in thread
* Re: [PATCH] perf/x86/intel: Export mem events only if there's PEBs support
2018-08-28 8:12 ` Peter Zijlstra
@ 2018-08-28 8:19 ` Jiri Olsa
2018-09-06 13:57 ` Jiri Olsa
0 siblings, 1 reply; 8+ messages in thread
From: Jiri Olsa @ 2018-08-28 8:19 UTC (permalink / raw)
To: Peter Zijlstra
Cc: Jiri Olsa, lkml, Ingo Molnar, Alexander Shishkin, Michael Petlan,
Arnaldo Carvalho de Melo, Andi Kleen
On Tue, Aug 28, 2018 at 10:12:32AM +0200, Peter Zijlstra wrote:
> On Mon, Aug 27, 2018 at 11:06:24AM +0200, Jiri Olsa wrote:
> > +static __init struct attribute **get_hsw_events_attrs(bool *alloc)
> > {
> > + if (boot_cpu_has(X86_FEATURE_RTM)) {
> > + *alloc = true;
> > + return merge_attr(hsw_events_attrs, hsw_tsx_events_attrs);
> > + }
> > + return hsw_events_attrs;
> > }
>
>
>
> > @@ -4357,6 +4374,15 @@ __init int intel_pmu_init(void)
> > WARN_ON(!x86_pmu.format_attrs);
> > }
> >
> > + if (x86_pmu.pebs && mem_attr) {
> > + struct attribute **attr = x86_pmu.cpu_events;
> > +
> > + x86_pmu.cpu_events = merge_attr(x86_pmu.cpu_events, mem_attr);
> > +
> > + if (alloc_events)
> > + kfree(attr);
> > + }
> > +
> > if (x86_pmu.num_counters > INTEL_PMC_MAX_GENERIC) {
> > WARN(1, KERN_ERR "hw perf events %d > max(%d), clipping!",
> > x86_pmu.num_counters, INTEL_PMC_MAX_GENERIC);
>
>
> static __init struct attribute **
> get_events_attrs(struct attribute **base,
> struct attribute **mem,
> struct attribute **tsx)
> {
> struct attribute **attrs = base;
> struct attribute **old;
>
> if (mem) {
> old = attrs;
> attrs = merge_attrs(attrs, mem);
> if (old != base)
> kfree(old);
> }
>
> if (tsx && boot_cpu_has(X86_FEATURE_RTM)) {
> old = attrs;
> attrs = merge_attrs(attrs, tsx);
> if (old != base)
> kfree(old);
> }
>
> return attrs;
> }
>
> Would that not help to concentrate things a little more?
looks like it would ;-) will check and repost
thanks,
jirka
^ permalink raw reply [flat|nested] 8+ messages in thread
* Re: [PATCH] perf/x86/intel: Export mem events only if there's PEBs support
2018-08-28 8:19 ` Jiri Olsa
@ 2018-09-06 13:57 ` Jiri Olsa
2018-09-23 16:26 ` Jiri Olsa
2018-10-16 16:03 ` [tip:perf/core] perf/x86/intel: Export mem events only if there's PEBS support tip-bot for Jiri Olsa
0 siblings, 2 replies; 8+ messages in thread
From: Jiri Olsa @ 2018-09-06 13:57 UTC (permalink / raw)
To: Peter Zijlstra
Cc: Jiri Olsa, lkml, Ingo Molnar, Alexander Shishkin, Michael Petlan,
Arnaldo Carvalho de Melo, Andi Kleen
On Tue, Aug 28, 2018 at 10:19:11AM +0200, Jiri Olsa wrote:
> On Tue, Aug 28, 2018 at 10:12:32AM +0200, Peter Zijlstra wrote:
> > On Mon, Aug 27, 2018 at 11:06:24AM +0200, Jiri Olsa wrote:
> > > +static __init struct attribute **get_hsw_events_attrs(bool *alloc)
> > > {
> > > + if (boot_cpu_has(X86_FEATURE_RTM)) {
> > > + *alloc = true;
> > > + return merge_attr(hsw_events_attrs, hsw_tsx_events_attrs);
> > > + }
> > > + return hsw_events_attrs;
> > > }
> >
> >
> >
> > > @@ -4357,6 +4374,15 @@ __init int intel_pmu_init(void)
> > > WARN_ON(!x86_pmu.format_attrs);
> > > }
> > >
> > > + if (x86_pmu.pebs && mem_attr) {
> > > + struct attribute **attr = x86_pmu.cpu_events;
> > > +
> > > + x86_pmu.cpu_events = merge_attr(x86_pmu.cpu_events, mem_attr);
> > > +
> > > + if (alloc_events)
> > > + kfree(attr);
> > > + }
> > > +
> > > if (x86_pmu.num_counters > INTEL_PMC_MAX_GENERIC) {
> > > WARN(1, KERN_ERR "hw perf events %d > max(%d), clipping!",
> > > x86_pmu.num_counters, INTEL_PMC_MAX_GENERIC);
> >
> >
> > static __init struct attribute **
> > get_events_attrs(struct attribute **base,
> > struct attribute **mem,
> > struct attribute **tsx)
> > {
> > struct attribute **attrs = base;
> > struct attribute **old;
> >
> > if (mem) {
> > old = attrs;
> > attrs = merge_attrs(attrs, mem);
> > if (old != base)
> > kfree(old);
> > }
> >
> > if (tsx && boot_cpu_has(X86_FEATURE_RTM)) {
> > old = attrs;
> > attrs = merge_attrs(attrs, tsx);
> > if (old != base)
> > kfree(old);
> > }
> >
> > return attrs;
> > }
> >
> > Would that not help to concentrate things a little more?
>
> looks like it would ;-) will check and repost
new version attached.. Michael tested on several machines,
but I couldn't find haswell with working tsx, to test
that those events are displayed
thanks,
jirka
---
Memory events depends on PEBs support and access to LDLAT msr,
but we display them in /sys/devices/cpu/events even if the cpu
does not provide those, like for KVM guests.
That brings the false assumption that those events should
be available, while they fail event to open.
Separating the mem-* events attributes and merging them
with cpu_events only if there's PEBs support detected.
We could also check if LDLAT msr is available, but the
PEBs check seems to cover the need now.
Suggested-by: Peter Zijlstra <peterz@infradead.org>
Signed-off-by: Jiri Olsa <jolsa@kernel.org>
---
arch/x86/events/core.c | 8 ++---
arch/x86/events/intel/core.c | 69 +++++++++++++++++++++++++++---------
2 files changed, 56 insertions(+), 21 deletions(-)
diff --git a/arch/x86/events/core.c b/arch/x86/events/core.c
index 5f4829f10129..1a17004f6559 100644
--- a/arch/x86/events/core.c
+++ b/arch/x86/events/core.c
@@ -1631,9 +1631,9 @@ __init struct attribute **merge_attr(struct attribute **a, struct attribute **b)
struct attribute **new;
int j, i;
- for (j = 0; a[j]; j++)
+ for (j = 0; a && a[j]; j++)
;
- for (i = 0; b[i]; i++)
+ for (i = 0; b && b[i]; i++)
j++;
j++;
@@ -1642,9 +1642,9 @@ __init struct attribute **merge_attr(struct attribute **a, struct attribute **b)
return NULL;
j = 0;
- for (i = 0; a[i]; i++)
+ for (i = 0; a && a[i]; i++)
new[j++] = a[i];
- for (i = 0; b[i]; i++)
+ for (i = 0; b && b[i]; i++)
new[j++] = b[i];
new[j] = NULL;
diff --git a/arch/x86/events/intel/core.c b/arch/x86/events/intel/core.c
index 035c37481f57..a10f80f697b7 100644
--- a/arch/x86/events/intel/core.c
+++ b/arch/x86/events/intel/core.c
@@ -242,7 +242,7 @@ EVENT_ATTR_STR(mem-loads, mem_ld_nhm, "event=0x0b,umask=0x10,ldlat=3");
EVENT_ATTR_STR(mem-loads, mem_ld_snb, "event=0xcd,umask=0x1,ldlat=3");
EVENT_ATTR_STR(mem-stores, mem_st_snb, "event=0xcd,umask=0x2");
-static struct attribute *nhm_events_attrs[] = {
+static struct attribute *nhm_mem_events_attrs[] = {
EVENT_PTR(mem_ld_nhm),
NULL,
};
@@ -278,8 +278,6 @@ EVENT_ATTR_STR_HT(topdown-recovery-bubbles.scale, td_recovery_bubbles_scale,
"4", "2");
static struct attribute *snb_events_attrs[] = {
- EVENT_PTR(mem_ld_snb),
- EVENT_PTR(mem_st_snb),
EVENT_PTR(td_slots_issued),
EVENT_PTR(td_slots_retired),
EVENT_PTR(td_fetch_bubbles),
@@ -290,6 +288,12 @@ static struct attribute *snb_events_attrs[] = {
NULL,
};
+static struct attribute *snb_mem_events_attrs[] = {
+ EVENT_PTR(mem_ld_snb),
+ EVENT_PTR(mem_st_snb),
+ NULL,
+};
+
static struct event_constraint intel_hsw_event_constraints[] = {
FIXED_EVENT_CONSTRAINT(0x00c0, 0), /* INST_RETIRED.ANY */
FIXED_EVENT_CONSTRAINT(0x003c, 1), /* CPU_CLK_UNHALTED.CORE */
@@ -3764,8 +3768,6 @@ EVENT_ATTR_STR(cycles-t, cycles_t, "event=0x3c,in_tx=1");
EVENT_ATTR_STR(cycles-ct, cycles_ct, "event=0x3c,in_tx=1,in_tx_cp=1");
static struct attribute *hsw_events_attrs[] = {
- EVENT_PTR(mem_ld_hsw),
- EVENT_PTR(mem_st_hsw),
EVENT_PTR(td_slots_issued),
EVENT_PTR(td_slots_retired),
EVENT_PTR(td_fetch_bubbles),
@@ -3776,6 +3778,12 @@ static struct attribute *hsw_events_attrs[] = {
NULL
};
+static struct attribute *hsw_mem_events_attrs[] = {
+ EVENT_PTR(mem_ld_hsw),
+ EVENT_PTR(mem_st_hsw),
+ NULL,
+};
+
static struct attribute *hsw_tsx_events_attrs[] = {
EVENT_PTR(tx_start),
EVENT_PTR(tx_commit),
@@ -3792,13 +3800,6 @@ static struct attribute *hsw_tsx_events_attrs[] = {
NULL
};
-static __init struct attribute **get_hsw_events_attrs(void)
-{
- return boot_cpu_has(X86_FEATURE_RTM) ?
- merge_attr(hsw_events_attrs, hsw_tsx_events_attrs) :
- hsw_events_attrs;
-}
-
static ssize_t freeze_on_smi_show(struct device *cdev,
struct device_attribute *attr,
char *buf)
@@ -3875,9 +3876,32 @@ static struct attribute *intel_pmu_attrs[] = {
NULL,
};
+static __init struct attribute **
+get_events_attrs(struct attribute **base,
+ struct attribute **mem,
+ struct attribute **tsx)
+{
+ struct attribute **attrs = base;
+ struct attribute **old;
+
+ if (mem && x86_pmu.pebs)
+ attrs = merge_attr(attrs, mem);
+
+ if (tsx && boot_cpu_has(X86_FEATURE_RTM)) {
+ old = attrs;
+ attrs = merge_attr(attrs, tsx);
+ if (old != base)
+ kfree(old);
+ }
+
+ return attrs;
+}
+
__init int intel_pmu_init(void)
{
struct attribute **extra_attr = NULL;
+ struct attribute **mem_attr = NULL;
+ struct attribute **tsx_attr = NULL;
struct attribute **to_free = NULL;
union cpuid10_edx edx;
union cpuid10_eax eax;
@@ -3986,7 +4010,7 @@ __init int intel_pmu_init(void)
x86_pmu.enable_all = intel_pmu_nhm_enable_all;
x86_pmu.extra_regs = intel_nehalem_extra_regs;
- x86_pmu.cpu_events = nhm_events_attrs;
+ mem_attr = nhm_mem_events_attrs;
/* UOPS_ISSUED.STALLED_CYCLES */
intel_perfmon_event_map[PERF_COUNT_HW_STALLED_CYCLES_FRONTEND] =
@@ -4112,7 +4136,7 @@ __init int intel_pmu_init(void)
x86_pmu.extra_regs = intel_westmere_extra_regs;
x86_pmu.flags |= PMU_FL_HAS_RSP_1;
- x86_pmu.cpu_events = nhm_events_attrs;
+ mem_attr = nhm_mem_events_attrs;
/* UOPS_ISSUED.STALLED_CYCLES */
intel_perfmon_event_map[PERF_COUNT_HW_STALLED_CYCLES_FRONTEND] =
@@ -4152,6 +4176,7 @@ __init int intel_pmu_init(void)
x86_pmu.flags |= PMU_FL_NO_HT_SHARING;
x86_pmu.cpu_events = snb_events_attrs;
+ mem_attr = snb_mem_events_attrs;
/* UOPS_ISSUED.ANY,c=1,i=1 to count stall cycles */
intel_perfmon_event_map[PERF_COUNT_HW_STALLED_CYCLES_FRONTEND] =
@@ -4192,6 +4217,7 @@ __init int intel_pmu_init(void)
x86_pmu.flags |= PMU_FL_NO_HT_SHARING;
x86_pmu.cpu_events = snb_events_attrs;
+ mem_attr = snb_mem_events_attrs;
/* UOPS_ISSUED.ANY,c=1,i=1 to count stall cycles */
intel_perfmon_event_map[PERF_COUNT_HW_STALLED_CYCLES_FRONTEND] =
@@ -4226,10 +4252,12 @@ __init int intel_pmu_init(void)
x86_pmu.hw_config = hsw_hw_config;
x86_pmu.get_event_constraints = hsw_get_event_constraints;
- x86_pmu.cpu_events = get_hsw_events_attrs();
+ x86_pmu.cpu_events = hsw_events_attrs;
x86_pmu.lbr_double_abort = true;
extra_attr = boot_cpu_has(X86_FEATURE_RTM) ?
hsw_format_attr : nhm_format_attr;
+ mem_attr = hsw_mem_events_attrs;
+ tsx_attr = hsw_tsx_events_attrs;
pr_cont("Haswell events, ");
name = "haswell";
break;
@@ -4265,10 +4293,12 @@ __init int intel_pmu_init(void)
x86_pmu.hw_config = hsw_hw_config;
x86_pmu.get_event_constraints = hsw_get_event_constraints;
- x86_pmu.cpu_events = get_hsw_events_attrs();
+ x86_pmu.cpu_events = hsw_events_attrs;
x86_pmu.limit_period = bdw_limit_period;
extra_attr = boot_cpu_has(X86_FEATURE_RTM) ?
hsw_format_attr : nhm_format_attr;
+ mem_attr = hsw_mem_events_attrs;
+ tsx_attr = hsw_tsx_events_attrs;
pr_cont("Broadwell events, ");
name = "broadwell";
break;
@@ -4324,7 +4354,9 @@ __init int intel_pmu_init(void)
hsw_format_attr : nhm_format_attr;
extra_attr = merge_attr(extra_attr, skl_format_attr);
to_free = extra_attr;
- x86_pmu.cpu_events = get_hsw_events_attrs();
+ x86_pmu.cpu_events = hsw_events_attrs;
+ mem_attr = hsw_mem_events_attrs;
+ tsx_attr = hsw_tsx_events_attrs;
intel_pmu_pebs_data_source_skl(
boot_cpu_data.x86_model == INTEL_FAM6_SKYLAKE_X);
pr_cont("Skylake events, ");
@@ -4357,6 +4389,9 @@ __init int intel_pmu_init(void)
WARN_ON(!x86_pmu.format_attrs);
}
+ x86_pmu.cpu_events = get_events_attrs(x86_pmu.cpu_events,
+ mem_attr, tsx_attr);
+
if (x86_pmu.num_counters > INTEL_PMC_MAX_GENERIC) {
WARN(1, KERN_ERR "hw perf events %d > max(%d), clipping!",
x86_pmu.num_counters, INTEL_PMC_MAX_GENERIC);
--
2.17.1
^ permalink raw reply related [flat|nested] 8+ messages in thread
* Re: [PATCH] perf/x86/intel: Export mem events only if there's PEBs support
2018-09-06 13:57 ` Jiri Olsa
@ 2018-09-23 16:26 ` Jiri Olsa
2018-10-16 16:03 ` [tip:perf/core] perf/x86/intel: Export mem events only if there's PEBS support tip-bot for Jiri Olsa
1 sibling, 0 replies; 8+ messages in thread
From: Jiri Olsa @ 2018-09-23 16:26 UTC (permalink / raw)
To: Peter Zijlstra
Cc: Jiri Olsa, lkml, Ingo Molnar, Alexander Shishkin, Michael Petlan,
Arnaldo Carvalho de Melo, Andi Kleen
On Thu, Sep 06, 2018 at 03:57:48PM +0200, Jiri Olsa wrote:
SNIP
> > looks like it would ;-) will check and repost
>
> new version attached.. Michael tested on several machines,
> but I couldn't find haswell with working tsx, to test
> that those events are displayed
>
> thanks,
> jirka
ping
jirka
>
>
> ---
> Memory events depends on PEBs support and access to LDLAT msr,
> but we display them in /sys/devices/cpu/events even if the cpu
> does not provide those, like for KVM guests.
>
> That brings the false assumption that those events should
> be available, while they fail event to open.
>
> Separating the mem-* events attributes and merging them
> with cpu_events only if there's PEBs support detected.
>
> We could also check if LDLAT msr is available, but the
> PEBs check seems to cover the need now.
>
> Suggested-by: Peter Zijlstra <peterz@infradead.org>
> Signed-off-by: Jiri Olsa <jolsa@kernel.org>
> ---
> arch/x86/events/core.c | 8 ++---
> arch/x86/events/intel/core.c | 69 +++++++++++++++++++++++++++---------
> 2 files changed, 56 insertions(+), 21 deletions(-)
>
> diff --git a/arch/x86/events/core.c b/arch/x86/events/core.c
> index 5f4829f10129..1a17004f6559 100644
> --- a/arch/x86/events/core.c
> +++ b/arch/x86/events/core.c
> @@ -1631,9 +1631,9 @@ __init struct attribute **merge_attr(struct attribute **a, struct attribute **b)
> struct attribute **new;
> int j, i;
>
> - for (j = 0; a[j]; j++)
> + for (j = 0; a && a[j]; j++)
> ;
> - for (i = 0; b[i]; i++)
> + for (i = 0; b && b[i]; i++)
> j++;
> j++;
>
> @@ -1642,9 +1642,9 @@ __init struct attribute **merge_attr(struct attribute **a, struct attribute **b)
> return NULL;
>
> j = 0;
> - for (i = 0; a[i]; i++)
> + for (i = 0; a && a[i]; i++)
> new[j++] = a[i];
> - for (i = 0; b[i]; i++)
> + for (i = 0; b && b[i]; i++)
> new[j++] = b[i];
> new[j] = NULL;
>
> diff --git a/arch/x86/events/intel/core.c b/arch/x86/events/intel/core.c
> index 035c37481f57..a10f80f697b7 100644
> --- a/arch/x86/events/intel/core.c
> +++ b/arch/x86/events/intel/core.c
> @@ -242,7 +242,7 @@ EVENT_ATTR_STR(mem-loads, mem_ld_nhm, "event=0x0b,umask=0x10,ldlat=3");
> EVENT_ATTR_STR(mem-loads, mem_ld_snb, "event=0xcd,umask=0x1,ldlat=3");
> EVENT_ATTR_STR(mem-stores, mem_st_snb, "event=0xcd,umask=0x2");
>
> -static struct attribute *nhm_events_attrs[] = {
> +static struct attribute *nhm_mem_events_attrs[] = {
> EVENT_PTR(mem_ld_nhm),
> NULL,
> };
> @@ -278,8 +278,6 @@ EVENT_ATTR_STR_HT(topdown-recovery-bubbles.scale, td_recovery_bubbles_scale,
> "4", "2");
>
> static struct attribute *snb_events_attrs[] = {
> - EVENT_PTR(mem_ld_snb),
> - EVENT_PTR(mem_st_snb),
> EVENT_PTR(td_slots_issued),
> EVENT_PTR(td_slots_retired),
> EVENT_PTR(td_fetch_bubbles),
> @@ -290,6 +288,12 @@ static struct attribute *snb_events_attrs[] = {
> NULL,
> };
>
> +static struct attribute *snb_mem_events_attrs[] = {
> + EVENT_PTR(mem_ld_snb),
> + EVENT_PTR(mem_st_snb),
> + NULL,
> +};
> +
> static struct event_constraint intel_hsw_event_constraints[] = {
> FIXED_EVENT_CONSTRAINT(0x00c0, 0), /* INST_RETIRED.ANY */
> FIXED_EVENT_CONSTRAINT(0x003c, 1), /* CPU_CLK_UNHALTED.CORE */
> @@ -3764,8 +3768,6 @@ EVENT_ATTR_STR(cycles-t, cycles_t, "event=0x3c,in_tx=1");
> EVENT_ATTR_STR(cycles-ct, cycles_ct, "event=0x3c,in_tx=1,in_tx_cp=1");
>
> static struct attribute *hsw_events_attrs[] = {
> - EVENT_PTR(mem_ld_hsw),
> - EVENT_PTR(mem_st_hsw),
> EVENT_PTR(td_slots_issued),
> EVENT_PTR(td_slots_retired),
> EVENT_PTR(td_fetch_bubbles),
> @@ -3776,6 +3778,12 @@ static struct attribute *hsw_events_attrs[] = {
> NULL
> };
>
> +static struct attribute *hsw_mem_events_attrs[] = {
> + EVENT_PTR(mem_ld_hsw),
> + EVENT_PTR(mem_st_hsw),
> + NULL,
> +};
> +
> static struct attribute *hsw_tsx_events_attrs[] = {
> EVENT_PTR(tx_start),
> EVENT_PTR(tx_commit),
> @@ -3792,13 +3800,6 @@ static struct attribute *hsw_tsx_events_attrs[] = {
> NULL
> };
>
> -static __init struct attribute **get_hsw_events_attrs(void)
> -{
> - return boot_cpu_has(X86_FEATURE_RTM) ?
> - merge_attr(hsw_events_attrs, hsw_tsx_events_attrs) :
> - hsw_events_attrs;
> -}
> -
> static ssize_t freeze_on_smi_show(struct device *cdev,
> struct device_attribute *attr,
> char *buf)
> @@ -3875,9 +3876,32 @@ static struct attribute *intel_pmu_attrs[] = {
> NULL,
> };
>
> +static __init struct attribute **
> +get_events_attrs(struct attribute **base,
> + struct attribute **mem,
> + struct attribute **tsx)
> +{
> + struct attribute **attrs = base;
> + struct attribute **old;
> +
> + if (mem && x86_pmu.pebs)
> + attrs = merge_attr(attrs, mem);
> +
> + if (tsx && boot_cpu_has(X86_FEATURE_RTM)) {
> + old = attrs;
> + attrs = merge_attr(attrs, tsx);
> + if (old != base)
> + kfree(old);
> + }
> +
> + return attrs;
> +}
> +
> __init int intel_pmu_init(void)
> {
> struct attribute **extra_attr = NULL;
> + struct attribute **mem_attr = NULL;
> + struct attribute **tsx_attr = NULL;
> struct attribute **to_free = NULL;
> union cpuid10_edx edx;
> union cpuid10_eax eax;
> @@ -3986,7 +4010,7 @@ __init int intel_pmu_init(void)
> x86_pmu.enable_all = intel_pmu_nhm_enable_all;
> x86_pmu.extra_regs = intel_nehalem_extra_regs;
>
> - x86_pmu.cpu_events = nhm_events_attrs;
> + mem_attr = nhm_mem_events_attrs;
>
> /* UOPS_ISSUED.STALLED_CYCLES */
> intel_perfmon_event_map[PERF_COUNT_HW_STALLED_CYCLES_FRONTEND] =
> @@ -4112,7 +4136,7 @@ __init int intel_pmu_init(void)
> x86_pmu.extra_regs = intel_westmere_extra_regs;
> x86_pmu.flags |= PMU_FL_HAS_RSP_1;
>
> - x86_pmu.cpu_events = nhm_events_attrs;
> + mem_attr = nhm_mem_events_attrs;
>
> /* UOPS_ISSUED.STALLED_CYCLES */
> intel_perfmon_event_map[PERF_COUNT_HW_STALLED_CYCLES_FRONTEND] =
> @@ -4152,6 +4176,7 @@ __init int intel_pmu_init(void)
> x86_pmu.flags |= PMU_FL_NO_HT_SHARING;
>
> x86_pmu.cpu_events = snb_events_attrs;
> + mem_attr = snb_mem_events_attrs;
>
> /* UOPS_ISSUED.ANY,c=1,i=1 to count stall cycles */
> intel_perfmon_event_map[PERF_COUNT_HW_STALLED_CYCLES_FRONTEND] =
> @@ -4192,6 +4217,7 @@ __init int intel_pmu_init(void)
> x86_pmu.flags |= PMU_FL_NO_HT_SHARING;
>
> x86_pmu.cpu_events = snb_events_attrs;
> + mem_attr = snb_mem_events_attrs;
>
> /* UOPS_ISSUED.ANY,c=1,i=1 to count stall cycles */
> intel_perfmon_event_map[PERF_COUNT_HW_STALLED_CYCLES_FRONTEND] =
> @@ -4226,10 +4252,12 @@ __init int intel_pmu_init(void)
>
> x86_pmu.hw_config = hsw_hw_config;
> x86_pmu.get_event_constraints = hsw_get_event_constraints;
> - x86_pmu.cpu_events = get_hsw_events_attrs();
> + x86_pmu.cpu_events = hsw_events_attrs;
> x86_pmu.lbr_double_abort = true;
> extra_attr = boot_cpu_has(X86_FEATURE_RTM) ?
> hsw_format_attr : nhm_format_attr;
> + mem_attr = hsw_mem_events_attrs;
> + tsx_attr = hsw_tsx_events_attrs;
> pr_cont("Haswell events, ");
> name = "haswell";
> break;
> @@ -4265,10 +4293,12 @@ __init int intel_pmu_init(void)
>
> x86_pmu.hw_config = hsw_hw_config;
> x86_pmu.get_event_constraints = hsw_get_event_constraints;
> - x86_pmu.cpu_events = get_hsw_events_attrs();
> + x86_pmu.cpu_events = hsw_events_attrs;
> x86_pmu.limit_period = bdw_limit_period;
> extra_attr = boot_cpu_has(X86_FEATURE_RTM) ?
> hsw_format_attr : nhm_format_attr;
> + mem_attr = hsw_mem_events_attrs;
> + tsx_attr = hsw_tsx_events_attrs;
> pr_cont("Broadwell events, ");
> name = "broadwell";
> break;
> @@ -4324,7 +4354,9 @@ __init int intel_pmu_init(void)
> hsw_format_attr : nhm_format_attr;
> extra_attr = merge_attr(extra_attr, skl_format_attr);
> to_free = extra_attr;
> - x86_pmu.cpu_events = get_hsw_events_attrs();
> + x86_pmu.cpu_events = hsw_events_attrs;
> + mem_attr = hsw_mem_events_attrs;
> + tsx_attr = hsw_tsx_events_attrs;
> intel_pmu_pebs_data_source_skl(
> boot_cpu_data.x86_model == INTEL_FAM6_SKYLAKE_X);
> pr_cont("Skylake events, ");
> @@ -4357,6 +4389,9 @@ __init int intel_pmu_init(void)
> WARN_ON(!x86_pmu.format_attrs);
> }
>
> + x86_pmu.cpu_events = get_events_attrs(x86_pmu.cpu_events,
> + mem_attr, tsx_attr);
> +
> if (x86_pmu.num_counters > INTEL_PMC_MAX_GENERIC) {
> WARN(1, KERN_ERR "hw perf events %d > max(%d), clipping!",
> x86_pmu.num_counters, INTEL_PMC_MAX_GENERIC);
> --
> 2.17.1
>
^ permalink raw reply [flat|nested] 8+ messages in thread
* [tip:perf/core] perf/x86/intel: Export mem events only if there's PEBS support
2018-09-06 13:57 ` Jiri Olsa
2018-09-23 16:26 ` Jiri Olsa
@ 2018-10-16 16:03 ` tip-bot for Jiri Olsa
1 sibling, 0 replies; 8+ messages in thread
From: tip-bot for Jiri Olsa @ 2018-10-16 16:03 UTC (permalink / raw)
To: linux-tip-commits
Cc: acme, eranian, acme, alexander.shishkin, vincent.weaver, tglx,
torvalds, jolsa, jolsa, mpetlan, hpa, mingo, linux-kernel,
peterz
Commit-ID: d4ae552982de39417d17f823df1f06b1cbc3686c
Gitweb: https://git.kernel.org/tip/d4ae552982de39417d17f823df1f06b1cbc3686c
Author: Jiri Olsa <jolsa@redhat.com>
AuthorDate: Thu, 6 Sep 2018 15:57:48 +0200
Committer: Ingo Molnar <mingo@kernel.org>
CommitDate: Tue, 16 Oct 2018 17:29:07 +0200
perf/x86/intel: Export mem events only if there's PEBS support
Memory events depends on PEBS support and access to LDLAT MSR, but we
display them in /sys/devices/cpu/events even if the CPU does not
provide those, like for KVM guests.
That brings the false assumption that those events should be
available, while they fail event to open.
Separating the mem-* events attributes and merging them with
cpu_events only if there's PEBS support detected.
We could also check if LDLAT MSR is available, but the PEBS check
seems to cover the need now.
Suggested-by: Peter Zijlstra <peterz@infradead.org>
Signed-off-by: Jiri Olsa <jolsa@kernel.org>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Arnaldo Carvalho de Melo <acme@kernel.org>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Michael Petlan <mpetlan@redhat.com>
Cc: Stephane Eranian <eranian@google.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Vince Weaver <vincent.weaver@maine.edu>
Link: http://lkml.kernel.org/r/20180906135748.GC9577@krava
Signed-off-by: Ingo Molnar <mingo@kernel.org>
---
arch/x86/events/core.c | 8 ++---
arch/x86/events/intel/core.c | 69 +++++++++++++++++++++++++++++++++-----------
2 files changed, 56 insertions(+), 21 deletions(-)
diff --git a/arch/x86/events/core.c b/arch/x86/events/core.c
index 06b708494898..de32741d041a 100644
--- a/arch/x86/events/core.c
+++ b/arch/x86/events/core.c
@@ -1652,9 +1652,9 @@ __init struct attribute **merge_attr(struct attribute **a, struct attribute **b)
struct attribute **new;
int j, i;
- for (j = 0; a[j]; j++)
+ for (j = 0; a && a[j]; j++)
;
- for (i = 0; b[i]; i++)
+ for (i = 0; b && b[i]; i++)
j++;
j++;
@@ -1663,9 +1663,9 @@ __init struct attribute **merge_attr(struct attribute **a, struct attribute **b)
return NULL;
j = 0;
- for (i = 0; a[i]; i++)
+ for (i = 0; a && a[i]; i++)
new[j++] = a[i];
- for (i = 0; b[i]; i++)
+ for (i = 0; b && b[i]; i++)
new[j++] = b[i];
new[j] = NULL;
diff --git a/arch/x86/events/intel/core.c b/arch/x86/events/intel/core.c
index ab01ef9ddd77..0fb8659b20d8 100644
--- a/arch/x86/events/intel/core.c
+++ b/arch/x86/events/intel/core.c
@@ -242,7 +242,7 @@ EVENT_ATTR_STR(mem-loads, mem_ld_nhm, "event=0x0b,umask=0x10,ldlat=3");
EVENT_ATTR_STR(mem-loads, mem_ld_snb, "event=0xcd,umask=0x1,ldlat=3");
EVENT_ATTR_STR(mem-stores, mem_st_snb, "event=0xcd,umask=0x2");
-static struct attribute *nhm_events_attrs[] = {
+static struct attribute *nhm_mem_events_attrs[] = {
EVENT_PTR(mem_ld_nhm),
NULL,
};
@@ -278,8 +278,6 @@ EVENT_ATTR_STR_HT(topdown-recovery-bubbles.scale, td_recovery_bubbles_scale,
"4", "2");
static struct attribute *snb_events_attrs[] = {
- EVENT_PTR(mem_ld_snb),
- EVENT_PTR(mem_st_snb),
EVENT_PTR(td_slots_issued),
EVENT_PTR(td_slots_retired),
EVENT_PTR(td_fetch_bubbles),
@@ -290,6 +288,12 @@ static struct attribute *snb_events_attrs[] = {
NULL,
};
+static struct attribute *snb_mem_events_attrs[] = {
+ EVENT_PTR(mem_ld_snb),
+ EVENT_PTR(mem_st_snb),
+ NULL,
+};
+
static struct event_constraint intel_hsw_event_constraints[] = {
FIXED_EVENT_CONSTRAINT(0x00c0, 0), /* INST_RETIRED.ANY */
FIXED_EVENT_CONSTRAINT(0x003c, 1), /* CPU_CLK_UNHALTED.CORE */
@@ -3912,8 +3916,6 @@ EVENT_ATTR_STR(cycles-t, cycles_t, "event=0x3c,in_tx=1");
EVENT_ATTR_STR(cycles-ct, cycles_ct, "event=0x3c,in_tx=1,in_tx_cp=1");
static struct attribute *hsw_events_attrs[] = {
- EVENT_PTR(mem_ld_hsw),
- EVENT_PTR(mem_st_hsw),
EVENT_PTR(td_slots_issued),
EVENT_PTR(td_slots_retired),
EVENT_PTR(td_fetch_bubbles),
@@ -3924,6 +3926,12 @@ static struct attribute *hsw_events_attrs[] = {
NULL
};
+static struct attribute *hsw_mem_events_attrs[] = {
+ EVENT_PTR(mem_ld_hsw),
+ EVENT_PTR(mem_st_hsw),
+ NULL,
+};
+
static struct attribute *hsw_tsx_events_attrs[] = {
EVENT_PTR(tx_start),
EVENT_PTR(tx_commit),
@@ -3940,13 +3948,6 @@ static struct attribute *hsw_tsx_events_attrs[] = {
NULL
};
-static __init struct attribute **get_hsw_events_attrs(void)
-{
- return boot_cpu_has(X86_FEATURE_RTM) ?
- merge_attr(hsw_events_attrs, hsw_tsx_events_attrs) :
- hsw_events_attrs;
-}
-
static ssize_t freeze_on_smi_show(struct device *cdev,
struct device_attribute *attr,
char *buf)
@@ -4023,9 +4024,32 @@ static struct attribute *intel_pmu_attrs[] = {
NULL,
};
+static __init struct attribute **
+get_events_attrs(struct attribute **base,
+ struct attribute **mem,
+ struct attribute **tsx)
+{
+ struct attribute **attrs = base;
+ struct attribute **old;
+
+ if (mem && x86_pmu.pebs)
+ attrs = merge_attr(attrs, mem);
+
+ if (tsx && boot_cpu_has(X86_FEATURE_RTM)) {
+ old = attrs;
+ attrs = merge_attr(attrs, tsx);
+ if (old != base)
+ kfree(old);
+ }
+
+ return attrs;
+}
+
__init int intel_pmu_init(void)
{
struct attribute **extra_attr = NULL;
+ struct attribute **mem_attr = NULL;
+ struct attribute **tsx_attr = NULL;
struct attribute **to_free = NULL;
union cpuid10_edx edx;
union cpuid10_eax eax;
@@ -4137,7 +4161,7 @@ __init int intel_pmu_init(void)
x86_pmu.enable_all = intel_pmu_nhm_enable_all;
x86_pmu.extra_regs = intel_nehalem_extra_regs;
- x86_pmu.cpu_events = nhm_events_attrs;
+ mem_attr = nhm_mem_events_attrs;
/* UOPS_ISSUED.STALLED_CYCLES */
intel_perfmon_event_map[PERF_COUNT_HW_STALLED_CYCLES_FRONTEND] =
@@ -4266,7 +4290,7 @@ __init int intel_pmu_init(void)
x86_pmu.extra_regs = intel_westmere_extra_regs;
x86_pmu.flags |= PMU_FL_HAS_RSP_1;
- x86_pmu.cpu_events = nhm_events_attrs;
+ mem_attr = nhm_mem_events_attrs;
/* UOPS_ISSUED.STALLED_CYCLES */
intel_perfmon_event_map[PERF_COUNT_HW_STALLED_CYCLES_FRONTEND] =
@@ -4306,6 +4330,7 @@ __init int intel_pmu_init(void)
x86_pmu.flags |= PMU_FL_NO_HT_SHARING;
x86_pmu.cpu_events = snb_events_attrs;
+ mem_attr = snb_mem_events_attrs;
/* UOPS_ISSUED.ANY,c=1,i=1 to count stall cycles */
intel_perfmon_event_map[PERF_COUNT_HW_STALLED_CYCLES_FRONTEND] =
@@ -4346,6 +4371,7 @@ __init int intel_pmu_init(void)
x86_pmu.flags |= PMU_FL_NO_HT_SHARING;
x86_pmu.cpu_events = snb_events_attrs;
+ mem_attr = snb_mem_events_attrs;
/* UOPS_ISSUED.ANY,c=1,i=1 to count stall cycles */
intel_perfmon_event_map[PERF_COUNT_HW_STALLED_CYCLES_FRONTEND] =
@@ -4380,10 +4406,12 @@ __init int intel_pmu_init(void)
x86_pmu.hw_config = hsw_hw_config;
x86_pmu.get_event_constraints = hsw_get_event_constraints;
- x86_pmu.cpu_events = get_hsw_events_attrs();
+ x86_pmu.cpu_events = hsw_events_attrs;
x86_pmu.lbr_double_abort = true;
extra_attr = boot_cpu_has(X86_FEATURE_RTM) ?
hsw_format_attr : nhm_format_attr;
+ mem_attr = hsw_mem_events_attrs;
+ tsx_attr = hsw_tsx_events_attrs;
pr_cont("Haswell events, ");
name = "haswell";
break;
@@ -4419,10 +4447,12 @@ __init int intel_pmu_init(void)
x86_pmu.hw_config = hsw_hw_config;
x86_pmu.get_event_constraints = hsw_get_event_constraints;
- x86_pmu.cpu_events = get_hsw_events_attrs();
+ x86_pmu.cpu_events = hsw_events_attrs;
x86_pmu.limit_period = bdw_limit_period;
extra_attr = boot_cpu_has(X86_FEATURE_RTM) ?
hsw_format_attr : nhm_format_attr;
+ mem_attr = hsw_mem_events_attrs;
+ tsx_attr = hsw_tsx_events_attrs;
pr_cont("Broadwell events, ");
name = "broadwell";
break;
@@ -4478,7 +4508,9 @@ __init int intel_pmu_init(void)
hsw_format_attr : nhm_format_attr;
extra_attr = merge_attr(extra_attr, skl_format_attr);
to_free = extra_attr;
- x86_pmu.cpu_events = get_hsw_events_attrs();
+ x86_pmu.cpu_events = hsw_events_attrs;
+ mem_attr = hsw_mem_events_attrs;
+ tsx_attr = hsw_tsx_events_attrs;
intel_pmu_pebs_data_source_skl(
boot_cpu_data.x86_model == INTEL_FAM6_SKYLAKE_X);
pr_cont("Skylake events, ");
@@ -4511,6 +4543,9 @@ __init int intel_pmu_init(void)
WARN_ON(!x86_pmu.format_attrs);
}
+ x86_pmu.cpu_events = get_events_attrs(x86_pmu.cpu_events,
+ mem_attr, tsx_attr);
+
if (x86_pmu.num_counters > INTEL_PMC_MAX_GENERIC) {
WARN(1, KERN_ERR "hw perf events %d > max(%d), clipping!",
x86_pmu.num_counters, INTEL_PMC_MAX_GENERIC);
^ permalink raw reply related [flat|nested] 8+ messages in thread
end of thread, other threads:[~2018-10-16 16:04 UTC | newest]
Thread overview: 8+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2018-08-13 15:48 [RFC] perf/x86/intel: Export mem events only if there's PEBs support Jiri Olsa
2018-08-13 18:58 ` Andi Kleen
2018-08-27 9:06 ` [PATCH] " Jiri Olsa
2018-08-28 8:12 ` Peter Zijlstra
2018-08-28 8:19 ` Jiri Olsa
2018-09-06 13:57 ` Jiri Olsa
2018-09-23 16:26 ` Jiri Olsa
2018-10-16 16:03 ` [tip:perf/core] perf/x86/intel: Export mem events only if there's PEBS support tip-bot for Jiri Olsa
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