Messages in this thread Patch in this message | | | Subject | Re: [PATCH v2 -tip] perf: x86, add SandyBridge support | From | Lin Ming <> | Date | Tue, 01 Mar 2011 16:45:41 +0800 |
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On Tue, 2011-03-01 at 15:43 +0800, Stephane Eranian wrote: > On Mon, Feb 28, 2011 at 10:15 AM, Peter Zijlstra <a.p.zijlstra@chello.nl> wrote: > > On Mon, 2011-02-28 at 15:22 +0800, Lin Ming wrote: > >> This patch adds basic SandyBridge support, including hardware cache > >> events and PEBS events support. > >> > >> LLC-* hareware cache events don't work for now, it depends on the > >> offcore patches. > > > > What's the status of those, Stephane reported some problems last I > > remember? > > > I tried the trick I mentioned and it seems to work. > > Something like below with hwc->extra_alloc. > Could probably find a better name for that field.
Stephane,
I'll integrate below changes to the offcore patches, OK?
diff --git a/arch/x86/kernel/cpu/perf_event_intel.c b/arch/x86/kernel/cpu/perf_event_intel.c index f152930..ac1d100 100644 --- a/arch/x86/kernel/cpu/perf_event_intel.c +++ b/arch/x86/kernel/cpu/perf_event_intel.c @@ -906,7 +906,7 @@ intel_percore_constraints(struct cpu_hw_events *cpuc, struct perf_event *event) int free_slot; int found; - if (!x86_pmu.percore_constraints) + if (!x86_pmu.percore_constraints || hwc->extra_alloc) return NULL; for (c = x86_pmu.percore_constraints; c->cmask; c++) { @@ -931,6 +931,7 @@ intel_percore_constraints(struct cpu_hw_events *cpuc, struct perf_event *event) if (hwc->extra_config == era->extra_config) { era->ref++; cpuc->percore_used = 1; + hwc->extra_alloc = 1; c = NULL; } /* else conflict */ @@ -945,6 +946,7 @@ intel_percore_constraints(struct cpu_hw_events *cpuc, struct perf_event *event) era->extra_reg = hwc->extra_reg; era->extra_config = hwc->extra_config; cpuc->percore_used = 1; + hwc->extra_alloc = 1; c = NULL; } raw_spin_unlock(&pc->lock); @@ -998,6 +1000,7 @@ static void intel_put_event_constraints(struct cpu_hw_events *cpuc, era->extra_config == hwc->extra_config && era->extra_reg == er->msr) { era->ref--; + hwc->extra_alloc = 0; break; } } diff --git a/include/linux/perf_event.h b/include/linux/perf_event.h index f531ce3..dbbf33a 100644 --- a/include/linux/perf_event.h +++ b/include/linux/perf_event.h @@ -546,6 +546,7 @@ struct hw_perf_event { int last_cpu; unsigned int extra_reg; u64 extra_config; + int extra_alloc; }; struct { /* software */ struct hrtimer hrtimer;
> > static struct event_constraint * > intel_percore_constraints(struct cpu_hw_events *cpuc, struct perf_event *event) > { > struct hw_perf_event *hwc = &event->hw; > unsigned int e = hwc->config & ARCH_PERFMON_EVENTSEL_EVENT; > struct event_constraint *c; > struct intel_percore *pc; > struct er_account *era; > int i; > int free_slot; > int found; > > if (!x86_pmu.percore_constraints) > return NULL; > > if (hwc->extra_alloc) > return NULL; > > for (c = x86_pmu.percore_constraints; c->cmask; c++) { > if (e != c->code) > continue; > > /* > * Allocate resource per core. > */ > c = NULL; > pc = cpuc->per_core; > if (!pc) > break; > c = &emptyconstraint; > raw_spin_lock(&pc->lock); > free_slot = -1; > found = 0; > for (i = 0; i < MAX_EXTRA_REGS; i++) { > era = &pc->regs[i]; > if (era->ref > 0 && hwc->extra_reg == era->extra_reg) { > /* Allow sharing same config */ > if (hwc->extra_config == era->extra_config) { > era->ref++; > cpuc->percore_used = 1; > hwc->extra_alloc = 1; > c = NULL; > } > /* else conflict */ > found = 1; > break; > } else if (era->ref == 0 && free_slot == -1) > free_slot = i; > } > if (!found && free_slot != -1) { > era = &pc->regs[free_slot]; > era->ref = 1; > era->extra_reg = hwc->extra_reg; > era->extra_config = hwc->extra_config; > cpuc->percore_used = 1; > hwc->extra_alloc = 1; > c = NULL; > } > raw_spin_unlock(&pc->lock); > return c; > } > > return NULL; > } > > static void intel_put_event_constraints(struct cpu_hw_events *cpuc, > struct perf_event *event) > { > struct extra_reg *er; > struct intel_percore *pc; > struct er_account *era; > struct hw_perf_event *hwc = &event->hw; > int i, allref; > > if (!cpuc->percore_used) > return; > > for (er = x86_pmu.extra_regs; er->msr; er++) { > if (er->event != (hwc->config & er->config_mask)) > continue; > > pc = cpuc->per_core; > raw_spin_lock(&pc->lock); > for (i = 0; i < MAX_EXTRA_REGS; i++) { > era = &pc->regs[i]; > if (era->ref > 0 && > era->extra_config == hwc->extra_config && > era->extra_reg == er->msr) { > era->ref--; > hwc->extra_alloc = 0; > break; > } > } > allref = 0; > for (i = 0; i < MAX_EXTRA_REGS; i++) > allref += pc->regs[i].ref; > if (allref == 0) > cpuc->percore_used = 0; > raw_spin_unlock(&pc->lock); > break; > } > } > > > > >> #define INTEL_EVENT_CONSTRAINT(c, n) \ > >> EVENT_CONSTRAINT(c, n, ARCH_PERFMON_EVENTSEL_EVENT) > >> +#define INTEL_EVENT_CONSTRAINT2(c, n) \ > >> + EVENT_CONSTRAINT(c, n, INTEL_ARCH_EVENT_MASK) > > > > That's a particularly bad name, how about something like > > > > INTEL_UEVENT_CONSTRAINT or somesuch. > > > >> @@ -702,7 +738,13 @@ static void intel_ds_init(void) > >> printk(KERN_CONT "PEBS fmt1%c, ", pebs_type); > >> x86_pmu.pebs_record_size = sizeof(struct pebs_record_nhm); > >> x86_pmu.drain_pebs = intel_pmu_drain_pebs_nhm; > >> - x86_pmu.pebs_constraints = intel_nehalem_pebs_events; > >> + switch (boot_cpu_data.x86_model) { > >> + case 42: /* SandyBridge */ > >> + x86_pmu.pebs_constraints = intel_snb_pebs_events; > >> + break; > >> + default: > >> + x86_pmu.pebs_constraints = intel_nehalem_pebs_events; > >> + } > >> break; > >> > >> default: > > > > We already have this massive model switch right after this function, > > might as well move the pebs constraint assignment there. > >
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