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authorIngo Molnar <mingo@elte.hu>2007-01-10 23:15:38 -0800
committerLinus Torvalds <torvalds@woody.osdl.org>2007-01-11 18:18:21 -0800
commit07031e14c1127fc7e1a5b98dfcc59f434e025104 (patch)
treebe4f545e674c529abb0f51c8b87e1f7137c9acb6
parente3881a6816b45668df60a426e5c3431ece1539a7 (diff)
downloadlinux-stericsson-07031e14c1127fc7e1a5b98dfcc59f434e025104.tar.gz
[PATCH] KVM: add VM-exit profiling
This adds the profile=kvm boot option, which enables KVM to profile VM exits. Use: "readprofile -m ./System.map | sort -n" to see the resulting output: [...] 18246 serial_out 148.3415 18945 native_flush_tlb 378.9000 23618 serial_in 212.7748 29279 __spin_unlock_irq 622.9574 43447 native_apic_write 2068.9048 52702 enable_8259A_irq 742.2817 54250 vgacon_scroll 89.3740 67394 ide_inb 6126.7273 79514 copy_page_range 98.1654 84868 do_wp_page 86.6000 140266 pit_read 783.6089 151436 ide_outb 25239.3333 152668 native_io_delay 21809.7143 174783 mask_and_ack_8259A 783.7803 362404 native_set_pte_at 36240.4000 1688747 total 0.5009 Signed-off-by: Ingo Molnar <mingo@elte.hu> Acked-by: Avi Kivity <avi@qumranet.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
-rw-r--r--drivers/kvm/svm.c8
-rw-r--r--drivers/kvm/vmx.c7
-rw-r--r--include/linux/profile.h1
-rw-r--r--kernel/profile.c14
4 files changed, 30 insertions, 0 deletions
diff --git a/drivers/kvm/svm.c b/drivers/kvm/svm.c
index ccc06b1b91b5..714f6a7841cd 100644
--- a/drivers/kvm/svm.c
+++ b/drivers/kvm/svm.c
@@ -17,6 +17,7 @@
#include <linux/module.h>
#include <linux/vmalloc.h>
#include <linux/highmem.h>
+#include <linux/profile.h>
#include <asm/desc.h>
#include "kvm_svm.h"
@@ -1558,6 +1559,13 @@ again:
reload_tss(vcpu);
+ /*
+ * Profile KVM exit RIPs:
+ */
+ if (unlikely(prof_on == KVM_PROFILING))
+ profile_hit(KVM_PROFILING,
+ (void *)(unsigned long)vcpu->svm->vmcb->save.rip);
+
stgi();
kvm_reput_irq(vcpu);
diff --git a/drivers/kvm/vmx.c b/drivers/kvm/vmx.c
index d4701cb4c654..ce219e3f557f 100644
--- a/drivers/kvm/vmx.c
+++ b/drivers/kvm/vmx.c
@@ -21,6 +21,7 @@
#include <linux/module.h>
#include <linux/mm.h>
#include <linux/highmem.h>
+#include <linux/profile.h>
#include <asm/io.h>
#include <asm/desc.h>
@@ -1859,6 +1860,12 @@ again:
asm ("mov %0, %%ds; mov %0, %%es" : : "r"(__USER_DS));
#endif
+ /*
+ * Profile KVM exit RIPs:
+ */
+ if (unlikely(prof_on == KVM_PROFILING))
+ profile_hit(KVM_PROFILING, (void *)vmcs_readl(GUEST_RIP));
+
kvm_run->exit_type = 0;
if (fail) {
kvm_run->exit_type = KVM_EXIT_TYPE_FAIL_ENTRY;
diff --git a/include/linux/profile.h b/include/linux/profile.h
index 5670b340c4ef..eec48f5f9348 100644
--- a/include/linux/profile.h
+++ b/include/linux/profile.h
@@ -15,6 +15,7 @@ extern int prof_on __read_mostly;
#define CPU_PROFILING 1
#define SCHED_PROFILING 2
#define SLEEP_PROFILING 3
+#define KVM_PROFILING 4
struct proc_dir_entry;
struct pt_regs;
diff --git a/kernel/profile.c b/kernel/profile.c
index 11550b2290b6..a6574a18514e 100644
--- a/kernel/profile.c
+++ b/kernel/profile.c
@@ -40,7 +40,10 @@ int (*timer_hook)(struct pt_regs *) __read_mostly;
static atomic_t *prof_buffer;
static unsigned long prof_len, prof_shift;
+
int prof_on __read_mostly;
+EXPORT_SYMBOL_GPL(prof_on);
+
static cpumask_t prof_cpu_mask = CPU_MASK_ALL;
#ifdef CONFIG_SMP
static DEFINE_PER_CPU(struct profile_hit *[2], cpu_profile_hits);
@@ -52,6 +55,7 @@ static int __init profile_setup(char * str)
{
static char __initdata schedstr[] = "schedule";
static char __initdata sleepstr[] = "sleep";
+ static char __initdata kvmstr[] = "kvm";
int par;
if (!strncmp(str, sleepstr, strlen(sleepstr))) {
@@ -72,6 +76,15 @@ static int __init profile_setup(char * str)
printk(KERN_INFO
"kernel schedule profiling enabled (shift: %ld)\n",
prof_shift);
+ } else if (!strncmp(str, kvmstr, strlen(kvmstr))) {
+ prof_on = KVM_PROFILING;
+ if (str[strlen(kvmstr)] == ',')
+ str += strlen(kvmstr) + 1;
+ if (get_option(&str, &par))
+ prof_shift = par;
+ printk(KERN_INFO
+ "kernel KVM profiling enabled (shift: %ld)\n",
+ prof_shift);
} else if (get_option(&str, &par)) {
prof_shift = par;
prof_on = CPU_PROFILING;
@@ -318,6 +331,7 @@ out:
local_irq_restore(flags);
put_cpu();
}
+EXPORT_SYMBOL_GPL(profile_hits);
static int __devinit profile_cpu_callback(struct notifier_block *info,
unsigned long action, void *__cpu)