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KVM: stats: Support linear and logarithmic histogram statistics

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Add new types of KVM stats, linear and logarithmic histogram.
Histogram are very useful for observing the value distribution
of time or size related stats.

Signed-off-by: Jing Zhang <jingzhangos@google.com>
Message-Id: <20210802165633.1866976-2-jingzhangos@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Jing Zhang 2021-08-02 16:56:29 +00:00 committed by Paolo Bonzini
parent 73143035c2
commit f95937ccf5
8 changed files with 82 additions and 43 deletions
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4
arch/arm64/kvm/guest.c
View File

@ -31,8 +31,6 @@
const struct _kvm_stats_desc kvm_vm_stats_desc[] = {
KVM_GENERIC_VM_STATS()
};
static_assert(ARRAY_SIZE(kvm_vm_stats_desc) ==
sizeof(struct kvm_vm_stat) / sizeof(u64));
const struct kvm_stats_header kvm_vm_stats_header = {
.name_size = KVM_STATS_NAME_SIZE,
@ -52,8 +50,6 @@ const struct _kvm_stats_desc kvm_vcpu_stats_desc[] = {
STATS_DESC_COUNTER(VCPU, mmio_exit_kernel),
STATS_DESC_COUNTER(VCPU, exits)
};
static_assert(ARRAY_SIZE(kvm_vcpu_stats_desc) ==
sizeof(struct kvm_vcpu_stat) / sizeof(u64));
const struct kvm_stats_header kvm_vcpu_stats_header = {
.name_size = KVM_STATS_NAME_SIZE,

4
arch/mips/kvm/mips.c
View File

@ -41,8 +41,6 @@
const struct _kvm_stats_desc kvm_vm_stats_desc[] = {
KVM_GENERIC_VM_STATS()
};
static_assert(ARRAY_SIZE(kvm_vm_stats_desc) ==
sizeof(struct kvm_vm_stat) / sizeof(u64));
const struct kvm_stats_header kvm_vm_stats_header = {
.name_size = KVM_STATS_NAME_SIZE,
@ -85,8 +83,6 @@ const struct _kvm_stats_desc kvm_vcpu_stats_desc[] = {
STATS_DESC_COUNTER(VCPU, vz_cpucfg_exits),
#endif
};
static_assert(ARRAY_SIZE(kvm_vcpu_stats_desc) ==
sizeof(struct kvm_vcpu_stat) / sizeof(u64));
const struct kvm_stats_header kvm_vcpu_stats_header = {
.name_size = KVM_STATS_NAME_SIZE,

4
arch/powerpc/kvm/book3s.c
View File

@ -43,8 +43,6 @@ const struct _kvm_stats_desc kvm_vm_stats_desc[] = {
STATS_DESC_ICOUNTER(VM, num_2M_pages),
STATS_DESC_ICOUNTER(VM, num_1G_pages)
};
static_assert(ARRAY_SIZE(kvm_vm_stats_desc) ==
sizeof(struct kvm_vm_stat) / sizeof(u64));
const struct kvm_stats_header kvm_vm_stats_header = {
.name_size = KVM_STATS_NAME_SIZE,
@ -88,8 +86,6 @@ const struct _kvm_stats_desc kvm_vcpu_stats_desc[] = {
STATS_DESC_COUNTER(VCPU, pthru_host),
STATS_DESC_COUNTER(VCPU, pthru_bad_aff)
};
static_assert(ARRAY_SIZE(kvm_vcpu_stats_desc) ==
sizeof(struct kvm_vcpu_stat) / sizeof(u64));
const struct kvm_stats_header kvm_vcpu_stats_header = {
.name_size = KVM_STATS_NAME_SIZE,

4
arch/powerpc/kvm/booke.c
View File

@ -41,8 +41,6 @@ const struct _kvm_stats_desc kvm_vm_stats_desc[] = {
STATS_DESC_ICOUNTER(VM, num_2M_pages),
STATS_DESC_ICOUNTER(VM, num_1G_pages)
};
static_assert(ARRAY_SIZE(kvm_vm_stats_desc) ==
sizeof(struct kvm_vm_stat) / sizeof(u64));
const struct kvm_stats_header kvm_vm_stats_header = {
.name_size = KVM_STATS_NAME_SIZE,
@ -79,8 +77,6 @@ const struct _kvm_stats_desc kvm_vcpu_stats_desc[] = {
STATS_DESC_COUNTER(VCPU, pthru_host),
STATS_DESC_COUNTER(VCPU, pthru_bad_aff)
};
static_assert(ARRAY_SIZE(kvm_vcpu_stats_desc) ==
sizeof(struct kvm_vcpu_stat) / sizeof(u64));
const struct kvm_stats_header kvm_vcpu_stats_header = {
.name_size = KVM_STATS_NAME_SIZE,

4
arch/s390/kvm/kvm-s390.c
View File

@ -66,8 +66,6 @@ const struct _kvm_stats_desc kvm_vm_stats_desc[] = {
STATS_DESC_COUNTER(VM, inject_service_signal),
STATS_DESC_COUNTER(VM, inject_virtio)
};
static_assert(ARRAY_SIZE(kvm_vm_stats_desc) ==
sizeof(struct kvm_vm_stat) / sizeof(u64));
const struct kvm_stats_header kvm_vm_stats_header = {
.name_size = KVM_STATS_NAME_SIZE,
@ -174,8 +172,6 @@ const struct _kvm_stats_desc kvm_vcpu_stats_desc[] = {
STATS_DESC_COUNTER(VCPU, instruction_diagnose_other),
STATS_DESC_COUNTER(VCPU, pfault_sync)
};
static_assert(ARRAY_SIZE(kvm_vcpu_stats_desc) ==
sizeof(struct kvm_vcpu_stat) / sizeof(u64));
const struct kvm_stats_header kvm_vcpu_stats_header = {
.name_size = KVM_STATS_NAME_SIZE,

4
arch/x86/kvm/x86.c
View File

@ -238,8 +238,6 @@ const struct _kvm_stats_desc kvm_vm_stats_desc[] = {
STATS_DESC_PCOUNTER(VM, max_mmu_rmap_size),
STATS_DESC_PCOUNTER(VM, max_mmu_page_hash_collisions)
};
static_assert(ARRAY_SIZE(kvm_vm_stats_desc) ==
sizeof(struct kvm_vm_stat) / sizeof(u64));
const struct kvm_stats_header kvm_vm_stats_header = {
.name_size = KVM_STATS_NAME_SIZE,
@ -279,8 +277,6 @@ const struct _kvm_stats_desc kvm_vcpu_stats_desc[] = {
STATS_DESC_COUNTER(VCPU, directed_yield_successful),
STATS_DESC_ICOUNTER(VCPU, guest_mode)
};
static_assert(ARRAY_SIZE(kvm_vcpu_stats_desc) ==
sizeof(struct kvm_vcpu_stat) / sizeof(u64));
const struct kvm_stats_header kvm_vcpu_stats_header = {
.name_size = KVM_STATS_NAME_SIZE,

90
include/linux/kvm_host.h
View File

@ -1356,56 +1356,66 @@ struct _kvm_stats_desc {
char name[KVM_STATS_NAME_SIZE];
};
#define STATS_DESC_COMMON(type, unit, base, exp) \
#define STATS_DESC_COMMON(type, unit, base, exp, sz, bsz) \
.flags = type | unit | base | \
BUILD_BUG_ON_ZERO(type & ~KVM_STATS_TYPE_MASK) | \
BUILD_BUG_ON_ZERO(unit & ~KVM_STATS_UNIT_MASK) | \
BUILD_BUG_ON_ZERO(base & ~KVM_STATS_BASE_MASK), \
.exponent = exp, \
.size = 1
.size = sz, \
.bucket_size = bsz
#define VM_GENERIC_STATS_DESC(stat, type, unit, base, exp) \
#define VM_GENERIC_STATS_DESC(stat, type, unit, base, exp, sz, bsz) \
{ \
{ \
STATS_DESC_COMMON(type, unit, base, exp), \
STATS_DESC_COMMON(type, unit, base, exp, sz, bsz), \
.offset = offsetof(struct kvm_vm_stat, generic.stat) \
}, \
.name = #stat, \
}
#define VCPU_GENERIC_STATS_DESC(stat, type, unit, base, exp) \
#define VCPU_GENERIC_STATS_DESC(stat, type, unit, base, exp, sz, bsz) \
{ \
{ \
STATS_DESC_COMMON(type, unit, base, exp), \
STATS_DESC_COMMON(type, unit, base, exp, sz, bsz), \
.offset = offsetof(struct kvm_vcpu_stat, generic.stat) \
}, \
.name = #stat, \
}
#define VM_STATS_DESC(stat, type, unit, base, exp) \
#define VM_STATS_DESC(stat, type, unit, base, exp, sz, bsz) \
{ \
{ \
STATS_DESC_COMMON(type, unit, base, exp), \
STATS_DESC_COMMON(type, unit, base, exp, sz, bsz), \
.offset = offsetof(struct kvm_vm_stat, stat) \
}, \
.name = #stat, \
}
#define VCPU_STATS_DESC(stat, type, unit, base, exp) \
#define VCPU_STATS_DESC(stat, type, unit, base, exp, sz, bsz) \
{ \
{ \
STATS_DESC_COMMON(type, unit, base, exp), \
STATS_DESC_COMMON(type, unit, base, exp, sz, bsz), \
.offset = offsetof(struct kvm_vcpu_stat, stat) \
}, \
.name = #stat, \
}
/* SCOPE: VM, VM_GENERIC, VCPU, VCPU_GENERIC */
#define STATS_DESC(SCOPE, stat, type, unit, base, exp) \
SCOPE##_STATS_DESC(stat, type, unit, base, exp)
#define STATS_DESC(SCOPE, stat, type, unit, base, exp, sz, bsz) \
SCOPE##_STATS_DESC(stat, type, unit, base, exp, sz, bsz)
#define STATS_DESC_CUMULATIVE(SCOPE, name, unit, base, exponent) \
STATS_DESC(SCOPE, name, KVM_STATS_TYPE_CUMULATIVE, unit, base, exponent)
STATS_DESC(SCOPE, name, KVM_STATS_TYPE_CUMULATIVE, \
unit, base, exponent, 1, 0)
#define STATS_DESC_INSTANT(SCOPE, name, unit, base, exponent) \
STATS_DESC(SCOPE, name, KVM_STATS_TYPE_INSTANT, unit, base, exponent)
STATS_DESC(SCOPE, name, KVM_STATS_TYPE_INSTANT, \
unit, base, exponent, 1, 0)
#define STATS_DESC_PEAK(SCOPE, name, unit, base, exponent) \
STATS_DESC(SCOPE, name, KVM_STATS_TYPE_PEAK, unit, base, exponent)
STATS_DESC(SCOPE, name, KVM_STATS_TYPE_PEAK, \
unit, base, exponent, 1, 0)
#define STATS_DESC_LINEAR_HIST(SCOPE, name, unit, base, exponent, sz, bsz) \
STATS_DESC(SCOPE, name, KVM_STATS_TYPE_LINEAR_HIST, \
unit, base, exponent, sz, bsz)
#define STATS_DESC_LOG_HIST(SCOPE, name, unit, base, exponent, sz) \
STATS_DESC(SCOPE, name, KVM_STATS_TYPE_LOG_HIST, \
unit, base, exponent, sz, 0)
/* Cumulative counter, read/write */
#define STATS_DESC_COUNTER(SCOPE, name) \
@ -1424,6 +1434,14 @@ struct _kvm_stats_desc {
#define STATS_DESC_TIME_NSEC(SCOPE, name) \
STATS_DESC_CUMULATIVE(SCOPE, name, KVM_STATS_UNIT_SECONDS, \
KVM_STATS_BASE_POW10, -9)
/* Linear histogram for time in nanosecond */
#define STATS_DESC_LINHIST_TIME_NSEC(SCOPE, name, sz, bsz) \
STATS_DESC_LINEAR_HIST(SCOPE, name, KVM_STATS_UNIT_SECONDS, \
KVM_STATS_BASE_POW10, -9, sz, bsz)
/* Logarithmic histogram for time in nanosecond */
#define STATS_DESC_LOGHIST_TIME_NSEC(SCOPE, name, sz) \
STATS_DESC_LOG_HIST(SCOPE, name, KVM_STATS_UNIT_SECONDS, \
KVM_STATS_BASE_POW10, -9, sz)
#define KVM_GENERIC_VM_STATS() \
STATS_DESC_COUNTER(VM_GENERIC, remote_tlb_flush)
@ -1437,10 +1455,52 @@ struct _kvm_stats_desc {
STATS_DESC_TIME_NSEC(VCPU_GENERIC, halt_poll_fail_ns)
extern struct dentry *kvm_debugfs_dir;
ssize_t kvm_stats_read(char *id, const struct kvm_stats_header *header,
const struct _kvm_stats_desc *desc,
void *stats, size_t size_stats,
char __user *user_buffer, size_t size, loff_t *offset);
/**
* kvm_stats_linear_hist_update() - Update bucket value for linear histogram
* statistics data.
*
* @data: start address of the stats data
* @size: the number of bucket of the stats data
* @value: the new value used to update the linear histogram's bucket
* @bucket_size: the size (width) of a bucket
*/
static inline void kvm_stats_linear_hist_update(u64 *data, size_t size,
u64 value, size_t bucket_size)
{
size_t index = div64_u64(value, bucket_size);
index = min(index, size - 1);
++data[index];
}
/**
* kvm_stats_log_hist_update() - Update bucket value for logarithmic histogram
* statistics data.
*
* @data: start address of the stats data
* @size: the number of bucket of the stats data
* @value: the new value used to update the logarithmic histogram's bucket
*/
static inline void kvm_stats_log_hist_update(u64 *data, size_t size, u64 value)
{
size_t index = fls64(value);
index = min(index, size - 1);
++data[index];
}
#define KVM_STATS_LINEAR_HIST_UPDATE(array, value, bsize) \
kvm_stats_linear_hist_update(array, ARRAY_SIZE(array), value, bsize)
#define KVM_STATS_LOG_HIST_UPDATE(array, value) \
kvm_stats_log_hist_update(array, ARRAY_SIZE(array), value)
extern const struct kvm_stats_header kvm_vm_stats_header;
extern const struct _kvm_stats_desc kvm_vm_stats_desc[];
extern const struct kvm_stats_header kvm_vcpu_stats_header;

11
include/uapi/linux/kvm.h
View File

@ -1965,7 +1965,9 @@ struct kvm_stats_header {
#define KVM_STATS_TYPE_CUMULATIVE (0x0 << KVM_STATS_TYPE_SHIFT)
#define KVM_STATS_TYPE_INSTANT (0x1 << KVM_STATS_TYPE_SHIFT)
#define KVM_STATS_TYPE_PEAK (0x2 << KVM_STATS_TYPE_SHIFT)
#define KVM_STATS_TYPE_MAX KVM_STATS_TYPE_PEAK
#define KVM_STATS_TYPE_LINEAR_HIST (0x3 << KVM_STATS_TYPE_SHIFT)
#define KVM_STATS_TYPE_LOG_HIST (0x4 << KVM_STATS_TYPE_SHIFT)
#define KVM_STATS_TYPE_MAX KVM_STATS_TYPE_LOG_HIST
#define KVM_STATS_UNIT_SHIFT 4
#define KVM_STATS_UNIT_MASK (0xF << KVM_STATS_UNIT_SHIFT)
@ -1988,8 +1990,9 @@ struct kvm_stats_header {
* @size: The number of data items for this stats.
* Every data item is of type __u64.
* @offset: The offset of the stats to the start of stat structure in
* struture kvm or kvm_vcpu.
* @unused: Unused field for future usage. Always 0 for now.
* structure kvm or kvm_vcpu.
* @bucket_size: A parameter value used for histogram stats. It is only used
* for linear histogram stats, specifying the size of the bucket;
* @name: The name string for the stats. Its size is indicated by the
* &kvm_stats_header->name_size.
*/
@ -1998,7 +2001,7 @@ struct kvm_stats_desc {
__s16 exponent;
__u16 size;
__u32 offset;
__u32 unused;
__u32 bucket_size;
char name[];
};