bd7ceaf6d5
Since previous commit, we calculate how much data we have send with migration_transferred_bytes() so no need to maintain this counter and remember to always update it. Signed-off-by: Juan Quintela <quintela@redhat.com> Reviewed-by: Cédric Le Goater <clg@kaod.org> Message-Id: <20230515195709.63843-10-quintela@redhat.com>
140 lines
3.5 KiB
C
140 lines
3.5 KiB
C
/*
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* Migration stats
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*
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* Copyright (c) 2012-2023 Red Hat Inc
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*
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* Authors:
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* Juan Quintela <quintela@redhat.com>
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*
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* This work is licensed under the terms of the GNU GPL, version 2 or later.
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* See the COPYING file in the top-level directory.
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*/
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#ifndef QEMU_MIGRATION_STATS_H
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#define QEMU_MIGRATION_STATS_H
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#include "qemu/stats64.h"
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/*
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* Amount of time to allocate to each "chunk" of bandwidth-throttled
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* data.
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*/
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#define BUFFER_DELAY 100
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/*
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* If rate_limit_max is 0, there is special code to remove the rate
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* limit.
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*/
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#define RATE_LIMIT_DISABLED 0
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/*
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* These are the ram migration statistic counters. It is loosely
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* based on MigrationStats. We change to Stat64 any counter that
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* needs to be updated using atomic ops (can be accessed by more than
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* one thread).
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*/
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typedef struct {
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/*
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* Number of bytes that were dirty last time that we synced with
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* the guest memory. We use that to calculate the downtime. As
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* the remaining dirty amounts to what we know that is still dirty
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* since last iteration, not counting what the guest has dirtied
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* since we synchronized bitmaps.
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*/
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Stat64 dirty_bytes_last_sync;
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/*
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* Number of pages dirtied per second.
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*/
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Stat64 dirty_pages_rate;
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/*
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* Number of times we have synchronized guest bitmaps.
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*/
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Stat64 dirty_sync_count;
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/*
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* Number of times zero copy failed to send any page using zero
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* copy.
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*/
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Stat64 dirty_sync_missed_zero_copy;
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/*
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* Number of bytes sent at migration completion stage while the
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* guest is stopped.
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*/
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Stat64 downtime_bytes;
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/*
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* Number of bytes sent through multifd channels.
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*/
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Stat64 multifd_bytes;
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/*
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* Number of pages transferred that were not full of zeros.
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*/
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Stat64 normal_pages;
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/*
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* Number of bytes sent during postcopy.
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*/
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Stat64 postcopy_bytes;
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/*
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* Number of postcopy page faults that we have handled during
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* postcopy stage.
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*/
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Stat64 postcopy_requests;
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/*
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* Number of bytes sent during precopy stage.
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*/
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Stat64 precopy_bytes;
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/*
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* Amount of transferred data at the start of current cycle.
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*/
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Stat64 rate_limit_start;
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/*
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* Maximum amount of data we can send in a cycle.
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*/
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Stat64 rate_limit_max;
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/*
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* Total number of bytes transferred.
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*/
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Stat64 transferred;
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/*
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* Number of pages transferred that were full of zeros.
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*/
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Stat64 zero_pages;
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} MigrationAtomicStats;
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extern MigrationAtomicStats mig_stats;
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/**
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* migration_rate_get: Get the maximum amount that can be transferred.
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*
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* Returns the maximum number of bytes that can be transferred in a cycle.
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*/
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uint64_t migration_rate_get(void);
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/**
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* migration_rate_reset: Reset the rate limit counter.
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*
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* This is called when we know we start a new transfer cycle.
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*
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* @f: QEMUFile used for main migration channel
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*/
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void migration_rate_reset(QEMUFile *f);
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/**
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* migration_rate_set: Set the maximum amount that can be transferred.
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*
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* Sets the maximum amount of bytes that can be transferred in one cycle.
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*
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* @new_rate: new maximum amount
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*/
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void migration_rate_set(uint64_t new_rate);
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/**
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* migration_transferred_bytes: Return number of bytes transferred
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*
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* @f: QEMUFile used for main migration channel
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*
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* Returns how many bytes have we transferred since the beginning of
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* the migration. It accounts for bytes sent through any migration
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* channel, multifd, qemu_file, rdma, ....
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*/
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uint64_t migration_transferred_bytes(QEMUFile *f);
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#endif
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