Commit b6276f35 authored by Peter Zijlstra's avatar Peter Zijlstra Committed by Ingo Molnar
Browse files

perf_counter: x86: self-IPI for pending work 



Implement set_perf_counter_pending() with a self-IPI so that it will
run ASAP in a usable context.

For now use a second IRQ vector, because the primary vector pokes
the apic in funny ways that seem to confuse things.

Signed-off-by: default avatarPeter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Corey Ashford <cjashfor@linux.vnet.ibm.com>
LKML-Reference: <20090406094517.724626696@chello.nl>
Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
parent 671dec5d

arch/x86/include/asm/entry_arch.h

+1 −0
Original line number Diff line number Diff line
@@ -50,6 +50,7 @@ BUILD_INTERRUPT(spurious_interrupt,SPURIOUS_APIC_VECTOR) 


#ifdef CONFIG_PERF_COUNTERS

BUILD_INTERRUPT(perf_counter_interrupt, LOCAL_PERF_VECTOR)

BUILD_INTERRUPT(perf_pending_interrupt, LOCAL_PENDING_VECTOR)

#endif



#ifdef CONFIG_X86_MCE_P4THERMAL

arch/x86/include/asm/hardirq.h

+1 −0
Original line number Diff line number Diff line
@@ -14,6 +14,7 @@ typedef struct { 
#endif

	unsigned int generic_irqs;	/* arch dependent */

	unsigned int apic_perf_irqs;

	unsigned int apic_pending_irqs;

#ifdef CONFIG_SMP

	unsigned int irq_resched_count;

	unsigned int irq_call_count;

arch/x86/include/asm/hw_irq.h

+1 −0
Original line number Diff line number Diff line
@@ -30,6 +30,7 @@ extern void apic_timer_interrupt(void); 
extern void generic_interrupt(void);

extern void error_interrupt(void);

extern void perf_counter_interrupt(void);

extern void perf_pending_interrupt(void);



extern void spurious_interrupt(void);

extern void thermal_interrupt(void);

arch/x86/include/asm/irq_vectors.h

+5 −0
Original line number Diff line number Diff line
@@ -116,6 +116,11 @@ 
 */

#define GENERIC_INTERRUPT_VECTOR	0xed



/*

 * Performance monitoring pending work vector:

 */

#define LOCAL_PENDING_VECTOR		0xec



/*

 * First APIC vector available to drivers: (vectors 0x30-0xee) we

 * start at 0x31(0x41) to spread out vectors evenly between priority

arch/x86/include/asm/perf_counter.h

+2 −1
Original line number Diff line number Diff line
@@ -84,7 +84,8 @@ union cpuid10_edx { 
#define MSR_ARCH_PERFMON_FIXED_CTR2			0x30b

#define X86_PMC_IDX_FIXED_BUS_CYCLES			(X86_PMC_IDX_FIXED + 2)



#define set_perf_counter_pending()	do { } while (0)

extern void set_perf_counter_pending(void);



#define clear_perf_counter_pending()	do { } while (0)

#define test_perf_counter_pending()	(0)

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