mirror of
https://gitlab.com/qemu-project/qemu
synced 2024-09-06 18:05:37 +00:00
![Juan Quintela](/assets/img/avatar_default.png)
After last commit, it is a write only variable. Reviewed-by: Fabiano Rosas <farosas@suse.de> Signed-off-by: Juan Quintela <quintela@redhat.com> Message-ID: <20231025091117.6342-12-quintela@redhat.com>
140 lines
3.5 KiB
C
140 lines
3.5 KiB
C
/*
|
|
* 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;
|
|
/*
|
|
* Number of bytes transferred with QEMUFile.
|
|
*/
|
|
Stat64 qemu_file_transferred;
|
|
/*
|
|
* Amount of transferred data at the start of current cycle.
|
|
*/
|
|
Stat64 rate_limit_start;
|
|
/*
|
|
* Maximum amount of data we can send in a cycle.
|
|
*/
|
|
Stat64 rate_limit_max;
|
|
/*
|
|
* Number of bytes sent through RDMA.
|
|
*/
|
|
Stat64 rdma_bytes;
|
|
/*
|
|
* Number of pages transferred that were full of zeros.
|
|
*/
|
|
Stat64 zero_pages;
|
|
} MigrationAtomicStats;
|
|
|
|
extern MigrationAtomicStats mig_stats;
|
|
|
|
/**
|
|
* 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);
|
|
|
|
/**
|
|
* migration_transferred_bytes: Return number of bytes transferred
|
|
*
|
|
* Returns how many bytes have we transferred since the beginning of
|
|
* the migration. It accounts for bytes sent through any migration
|
|
* channel, multifd, qemu_file, rdma, ....
|
|
*/
|
|
uint64_t migration_transferred_bytes(void);
|
|
#endif
|