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perf_events: Update Intel extra regs shared constraints management

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This patch improves the code managing the extra shared registers
used for offcore_response events on Intel Nehalem/Westmere. The
idea is to use static allocation instead of dynamic allocation.
This simplifies greatly the get and put constraint routines for
those events.

The patch also renames per_core to shared_regs because the same
data structure gets used whether or not HT is on. When HT is
off, those events still need to coordination because they use
a extra MSR that has to be shared within an event group.

Signed-off-by: Stephane Eranian <eranian@google.com>
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Link: http://lkml.kernel.org/r/20110606145703.GA7258@quad
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Stephane Eranian 2011-06-06 16:57:03 +02:00 • committed by Ingo Molnar
parent a7ac67ea02
commit efc9f05df2
3 changed files with 201 additions and 153 deletions
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14
include/linux/perf_event.h
View file

@ -536,6 +536,16 @@ struct perf_branch_stack {
struct task_struct;
/*
* extra PMU register associated with an event
*/
struct hw_perf_event_extra {
u64 config; /* register value */
unsigned int reg; /* register address or index */
int alloc; /* extra register already allocated */
int idx; /* index in shared_regs->regs[] */
};
/**
* struct hw_perf_event - performance event hardware details:
*/
@ -549,9 +559,7 @@ struct hw_perf_event {
unsigned long event_base;
int idx;
int last_cpu;
unsigned int extra_reg;
u64 extra_config;
int extra_alloc;
struct hw_perf_event_extra extra_reg;
};
struct { /* software */
struct hrtimer hrtimer;