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Some errors, like the lack of Scatter-Gather support by the network interface(NETIF_F_SG) may cause sendmsg(...,MSG_ZEROCOPY) to fail on using zero-copy, which causes it to fall back to the default copying mechanism. After each full dirty-bitmap scan there should be a zero-copy flush happening, which checks for errors each of the previous calls to sendmsg(...,MSG_ZEROCOPY). If all of them failed to use zero-copy, then increment dirty_sync_missed_zero_copy migration stat to let the user know about it. Signed-off-by: Leonardo Bras <leobras@redhat.com> Reviewed-by: Daniel P. Berrangé <berrange@redhat.com> Acked-by: Peter Xu <peterx@redhat.com> Message-Id: <20220711211112.18951-4-leobras@redhat.com> Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
95 lines
3.7 KiB
C
95 lines
3.7 KiB
C
/*
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* QEMU System Emulator
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*
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* Copyright (c) 2003-2008 Fabrice Bellard
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* Copyright (c) 2011-2015 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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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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#ifndef QEMU_MIGRATION_RAM_H
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#define QEMU_MIGRATION_RAM_H
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#include "qapi/qapi-types-migration.h"
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#include "exec/cpu-common.h"
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#include "io/channel.h"
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extern MigrationStats ram_counters;
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extern XBZRLECacheStats xbzrle_counters;
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extern CompressionStats compression_counters;
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bool ramblock_is_ignored(RAMBlock *block);
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/* Should be holding either ram_list.mutex, or the RCU lock. */
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#define RAMBLOCK_FOREACH_NOT_IGNORED(block) \
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INTERNAL_RAMBLOCK_FOREACH(block) \
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if (ramblock_is_ignored(block)) {} else
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#define RAMBLOCK_FOREACH_MIGRATABLE(block) \
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INTERNAL_RAMBLOCK_FOREACH(block) \
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if (!qemu_ram_is_migratable(block)) {} else
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int xbzrle_cache_resize(uint64_t new_size, Error **errp);
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uint64_t ram_bytes_remaining(void);
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uint64_t ram_bytes_total(void);
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void mig_throttle_counter_reset(void);
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uint64_t ram_pagesize_summary(void);
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int ram_save_queue_pages(const char *rbname, ram_addr_t start, ram_addr_t len);
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void acct_update_position(QEMUFile *f, size_t size, bool zero);
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void ram_postcopy_migrated_memory_release(MigrationState *ms);
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/* For outgoing discard bitmap */
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void ram_postcopy_send_discard_bitmap(MigrationState *ms);
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/* For incoming postcopy discard */
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int ram_discard_range(const char *block_name, uint64_t start, size_t length);
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int ram_postcopy_incoming_init(MigrationIncomingState *mis);
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int ram_load_postcopy(QEMUFile *f, int channel);
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void ram_handle_compressed(void *host, uint8_t ch, uint64_t size);
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int ramblock_recv_bitmap_test(RAMBlock *rb, void *host_addr);
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bool ramblock_recv_bitmap_test_byte_offset(RAMBlock *rb, uint64_t byte_offset);
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void ramblock_recv_bitmap_set(RAMBlock *rb, void *host_addr);
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void ramblock_recv_bitmap_set_range(RAMBlock *rb, void *host_addr, size_t nr);
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int64_t ramblock_recv_bitmap_send(QEMUFile *file,
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const char *block_name);
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int ram_dirty_bitmap_reload(MigrationState *s, RAMBlock *rb);
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bool ramblock_page_is_discarded(RAMBlock *rb, ram_addr_t start);
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void postcopy_preempt_shutdown_file(MigrationState *s);
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void *postcopy_preempt_thread(void *opaque);
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/* ram cache */
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int colo_init_ram_cache(void);
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void colo_flush_ram_cache(void);
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void colo_release_ram_cache(void);
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void colo_incoming_start_dirty_log(void);
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/* Background snapshot */
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bool ram_write_tracking_available(void);
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bool ram_write_tracking_compatible(void);
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void ram_write_tracking_prepare(void);
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int ram_write_tracking_start(void);
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void ram_write_tracking_stop(void);
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void dirty_sync_missed_zero_copy(void);
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#endif
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