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perfmon: X86 64-bit hooks (x86)

PATCH In review [email protected] 1 participant 1 message Nov 26, 2008 x86

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PATCH 8/24 perfmon: X86 64-bit hooks (x86)

This patch adds the necessary hooks to the X86 64-bit code to support initialization, interrupts, context switching, and termination of a perfmon session.

Signed-off-by Stephane Eranian <[email protected]>

-

arch/x86/kernel/entry_64.S +7 -1
Index: o3/arch/x86/kernel/entry_64.S
===================================================================
@@ -869,7 +869,13 @@
 ENTRY(spurious_interrupt)
 	apicinterrupt SPURIOUS_APIC_VECTOR,smp_spurious_interrupt
 END(spurious_interrupt)
-				
+
+#ifdef CONFIG_PERFMON
+ENTRY(pmu_interrupt)
+	apicinterrupt LOCAL_PERFMON_VECTOR,smp_pmu_interrupt
+END(pmu_interrupt)
+#endif
+
 /*
  * Exception entry points.
  */
arch/x86/kernel/process_64.c +10 -0
Index: o3/arch/x86/kernel/process_64.c
===================================================================
@@ -36,6 +36,7 @@
 #include <linux/kprobes.h>
 #include <linux/kdebug.h>
 #include <linux/tick.h>
+#include <linux/perfmon_kern.h>
 #include <linux/prctl.h>
 #include <linux/uaccess.h>
 #include <linux/io.h>

@@ -243,6 +244,7 @@
 		ds_free(t->ds_ctx);
 	}
 #endif /* CONFIG_X86_DS */
+	pfm_exit_thread();
 }
 
 void flush_thread(void)

@@ -347,6 +349,8 @@
 	savesegment(es, p->thread.es);
 	savesegment(ds, p->thread.ds);
 
+	pfm_copy_thread(p);
+
 	if (unlikely(test_tsk_thread_flag(me, TIF_IO_BITMAP))) {
 		p->thread.io_bitmap_ptr = kmalloc(IO_BITMAP_BYTES, GFP_KERNEL);
 		if (!p->thread.io_bitmap_ptr) {

@@ -475,6 +479,9 @@
 	prev = &prev_p->thread,
 	next = &next_p->thread;
 
+	if (test_tsk_thread_flag(prev_p, TIF_PERFMON_CTXSW))
+		pfm_ctxsw_out(prev_p, next_p);
+
 	debugctl = prev->debugctlmsr;
 
 #ifdef CONFIG_X86_DS

@@ -501,6 +508,9 @@
 	if (next->debugctlmsr != debugctl)
 		update_debugctlmsr(next->debugctlmsr);
 
+	if (test_tsk_thread_flag(next_p, TIF_PERFMON_CTXSW))
+		pfm_ctxsw_in(prev_p, next_p);
+
 	if (test_tsk_thread_flag(next_p, TIF_DEBUG)) {
 		loaddebug(next, 0);
 		loaddebug(next, 1);
arch/x86/kernel/signal_64.c +5 -0
Index: o3/arch/x86/kernel/signal_64.c
===================================================================
@@ -21,6 +21,7 @@
 #include <linux/personality.h>
 #include <linux/compiler.h>
 #include <linux/uaccess.h>
+#include <linux/perfmon_kern.h>
 
 #include <asm/processor.h>
 #include <asm/ucontext.h>

@@ -485,6 +486,10 @@
 		mce_notify_user();
 #endif /* CONFIG_X86_64 && CONFIG_X86_MCE */
 
+ 	/* process perfmon asynchronous work (e.g. block thread or reset) */
+ 	if (thread_info_flags & _TIF_PERFMON_WORK)
+ 		pfm_handle_work(regs);
+
 	/* deal with pending signal delivery */
 	if (thread_info_flags & _TIF_SIGPENDING)
 		do_signal(regs);
arch/x86/kernel/irqinit_64.c +5 -0
Index: o3/arch/x86/kernel/irqinit_64.c
===================================================================
@@ -11,6 +11,7 @@
 #include <linux/kernel_stat.h>
 #include <linux/sysdev.h>
 #include <linux/bitops.h>
+#include <linux/perfmon_kern.h>
 
 #include <asm/acpi.h>
 #include <asm/atomic.h>

@@ -224,6 +225,10 @@
 
 	apic_intr_init();
 
+#ifdef CONFIG_PERFMON
+	alloc_intr_gate(LOCAL_PERFMON_VECTOR, pmu_interrupt);
+#endif
+
 	if (!acpi_ioapic)
 		setup_irq(2, &irq2);
 }