diff options
| author | Ingo Molnar <mingo@elte.hu> | 2007-01-10 23:15:38 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@woody.osdl.org> | 2007-01-11 18:18:21 -0800 |
| commit | 07031e14c1127fc7e1a5b98dfcc59f434e025104 (patch) | |
| tree | be4f545e674c529abb0f51c8b87e1f7137c9acb6 /kernel/profile.c | |
| parent | e3881a6816b45668df60a426e5c3431ece1539a7 (diff) | |
| download | lwn-07031e14c1127fc7e1a5b98dfcc59f434e025104.tar.gz lwn-07031e14c1127fc7e1a5b98dfcc59f434e025104.zip | |
[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>
Diffstat (limited to 'kernel/profile.c')
| -rw-r--r-- | kernel/profile.c | 14 |
1 files changed, 14 insertions, 0 deletions
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) |