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/*
* Migration stats
*
* Copyright (c) 2012-2023 Red Hat Inc
*
* Authors:
* Juan Quintela <quintela@redhat.com>
*
* This work is licensed under the terms of the GNU GPL, version 2 or later.
* See the COPYING file in the top-level directory.
*/
#ifndef QEMU_MIGRATION_STATS_H
#define QEMU_MIGRATION_STATS_H
#include "qemu/stats64.h"
/*
* Amount of time to allocate to each "chunk" of bandwidth-throttled
* data.
*/
#define BUFFER_DELAY 100
/*
* If rate_limit_max is 0, there is special code to remove the rate
* limit.
*/
#define RATE_LIMIT_DISABLED 0
/*
* These are the ram migration statistic counters. It is loosely
* based on MigrationStats. We change to Stat64 any counter that
* needs to be updated using atomic ops (can be accessed by more than
* one thread).
*/
typedef struct {
/*
* Number of bytes that were dirty last time that we synced with
* the guest memory. We use that to calculate the downtime. As
* the remaining dirty amounts to what we know that is still dirty
* since last iteration, not counting what the guest has dirtied
* since we synchronized bitmaps.
*/
Stat64 dirty_bytes_last_sync;
/*
* Number of pages dirtied per second.
*/
Stat64 dirty_pages_rate;
/*
* Number of times we have synchronized guest bitmaps.
*/
Stat64 dirty_sync_count;
/*
* Number of times zero copy failed to send any page using zero
* copy.
*/
Stat64 dirty_sync_missed_zero_copy;
/*
* Number of bytes sent at migration completion stage while the
* guest is stopped.
*/
Stat64 downtime_bytes;
/*
* Number of bytes sent through multifd channels.
*/
Stat64 multifd_bytes;
/*
* Number of pages transferred that were not full of zeros.
*/
Stat64 normal_pages;
/*
* Number of bytes sent during postcopy.
*/
Stat64 postcopy_bytes;
/*
* Number of postcopy page faults that we have handled during
* postcopy stage.
*/
Stat64 postcopy_requests;
/*
* Number of bytes sent during precopy stage.
*/
Stat64 precopy_bytes;
/*
* Maximum amount of data we can send in a cycle.
*/
Stat64 rate_limit_max;
/*
* Amount of data we have sent in the current cycle.
*/
Stat64 rate_limit_used;
/*
* Total number of bytes transferred.
*/
Stat64 transferred;
/*
* Number of pages transferred that were full of zeros.
*/
Stat64 zero_pages;
} MigrationAtomicStats;
extern MigrationAtomicStats mig_stats;
/**
* migration_rate_account: Increase the number of bytes transferred.
*
* Report on a number of bytes the have been transferred that need to
* be applied to the rate limiting calcuations.
*
* @len: amount of bytes transferred
*/
void migration_rate_account(uint64_t len);
/**
* migration_rate_get: Get the maximum amount that can be transferred.
*
* Returns the maximum number of bytes that can be transferred in a cycle.
*/
uint64_t migration_rate_get(void);
/**
* migration_rate_reset: Reset the rate limit counter.
*
* This is called when we know we start a new transfer cycle.
*/
void migration_rate_reset(void);
/**
* migration_rate_set: Set the maximum amount that can be transferred.
*
* Sets the maximum amount of bytes that can be transferred in one cycle.
*
* @new_rate: new maximum amount
*/
void migration_rate_set(uint64_t new_rate);
#endif
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