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![Hao Xiang](/assets/img/avatar_default.png)
1. Add zero_pages field in MultiFDPacket_t. 2. Implements the zero page detection and handling on the multifd threads for non-compression, zlib and zstd compression backends. 3. Added a new value 'multifd' in ZeroPageDetection enumeration. 4. Adds zero page counters and updates multifd send/receive tracing format to track the newly added counters. Signed-off-by: Hao Xiang <hao.xiang@bytedance.com> Acked-by: Markus Armbruster <armbru@redhat.com> Reviewed-by: Fabiano Rosas <farosas@suse.de> Link: https://lore.kernel.org/r/20240311180015.3359271-5-hao.xiang@linux.dev Signed-off-by: Peter Xu <peterx@redhat.com>
256 lines
7.3 KiB
C
256 lines
7.3 KiB
C
/*
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* Multifd common functions
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*
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* Copyright (c) 2019-2020 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_MULTIFD_H
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#define QEMU_MIGRATION_MULTIFD_H
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#include "ram.h"
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typedef struct MultiFDRecvData MultiFDRecvData;
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bool multifd_send_setup(void);
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void multifd_send_shutdown(void);
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void multifd_send_channel_created(void);
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int multifd_recv_setup(Error **errp);
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void multifd_recv_cleanup(void);
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void multifd_recv_shutdown(void);
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bool multifd_recv_all_channels_created(void);
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void multifd_recv_new_channel(QIOChannel *ioc, Error **errp);
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void multifd_recv_sync_main(void);
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int multifd_send_sync_main(void);
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bool multifd_queue_page(RAMBlock *block, ram_addr_t offset);
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bool multifd_recv(void);
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MultiFDRecvData *multifd_get_recv_data(void);
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/* Multifd Compression flags */
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#define MULTIFD_FLAG_SYNC (1 << 0)
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/* We reserve 3 bits for compression methods */
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#define MULTIFD_FLAG_COMPRESSION_MASK (7 << 1)
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/* we need to be compatible. Before compression value was 0 */
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#define MULTIFD_FLAG_NOCOMP (0 << 1)
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#define MULTIFD_FLAG_ZLIB (1 << 1)
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#define MULTIFD_FLAG_ZSTD (2 << 1)
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/* This value needs to be a multiple of qemu_target_page_size() */
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#define MULTIFD_PACKET_SIZE (512 * 1024)
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typedef struct {
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uint32_t magic;
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uint32_t version;
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uint32_t flags;
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/* maximum number of allocated pages */
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uint32_t pages_alloc;
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/* non zero pages */
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uint32_t normal_pages;
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/* size of the next packet that contains pages */
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uint32_t next_packet_size;
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uint64_t packet_num;
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/* zero pages */
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uint32_t zero_pages;
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uint32_t unused32[1]; /* Reserved for future use */
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uint64_t unused64[3]; /* Reserved for future use */
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char ramblock[256];
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/*
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* This array contains the pointers to:
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* - normal pages (initial normal_pages entries)
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* - zero pages (following zero_pages entries)
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*/
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uint64_t offset[];
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} __attribute__((packed)) MultiFDPacket_t;
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typedef struct {
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/* number of used pages */
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uint32_t num;
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/* number of normal pages */
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uint32_t normal_num;
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/* number of allocated pages */
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uint32_t allocated;
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/* offset of each page */
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ram_addr_t *offset;
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RAMBlock *block;
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} MultiFDPages_t;
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struct MultiFDRecvData {
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void *opaque;
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size_t size;
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/* for preadv */
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off_t file_offset;
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};
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typedef struct {
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/* Fields are only written at creating/deletion time */
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/* No lock required for them, they are read only */
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/* channel number */
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uint8_t id;
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/* channel thread name */
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char *name;
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/* channel thread id */
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QemuThread thread;
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bool thread_created;
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QemuThread tls_thread;
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bool tls_thread_created;
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/* communication channel */
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QIOChannel *c;
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/* packet allocated len */
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uint32_t packet_len;
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/* guest page size */
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uint32_t page_size;
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/* number of pages in a full packet */
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uint32_t page_count;
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/* multifd flags for sending ram */
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int write_flags;
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/* sem where to wait for more work */
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QemuSemaphore sem;
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/* syncs main thread and channels */
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QemuSemaphore sem_sync;
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/* multifd flags for each packet */
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uint32_t flags;
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/*
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* The sender thread has work to do if either of below boolean is set.
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*
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* @pending_job: a job is pending
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* @pending_sync: a sync request is pending
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*
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* For both of these fields, they're only set by the requesters, and
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* cleared by the multifd sender threads.
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*/
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bool pending_job;
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bool pending_sync;
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/* array of pages to sent.
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* The owner of 'pages' depends of 'pending_job' value:
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* pending_job == 0 -> migration_thread can use it.
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* pending_job != 0 -> multifd_channel can use it.
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*/
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MultiFDPages_t *pages;
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/* thread local variables. No locking required */
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/* pointer to the packet */
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MultiFDPacket_t *packet;
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/* size of the next packet that contains pages */
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uint32_t next_packet_size;
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/* packets sent through this channel */
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uint64_t packets_sent;
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/* non zero pages sent through this channel */
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uint64_t total_normal_pages;
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/* zero pages sent through this channel */
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uint64_t total_zero_pages;
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/* buffers to send */
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struct iovec *iov;
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/* number of iovs used */
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uint32_t iovs_num;
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/* used for compression methods */
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void *compress_data;
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} MultiFDSendParams;
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typedef struct {
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/* Fields are only written at creating/deletion time */
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/* No lock required for them, they are read only */
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/* channel number */
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uint8_t id;
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/* channel thread name */
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char *name;
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/* channel thread id */
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QemuThread thread;
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bool thread_created;
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/* communication channel */
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QIOChannel *c;
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/* packet allocated len */
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uint32_t packet_len;
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/* guest page size */
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uint32_t page_size;
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/* number of pages in a full packet */
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uint32_t page_count;
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/* syncs main thread and channels */
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QemuSemaphore sem_sync;
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/* sem where to wait for more work */
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QemuSemaphore sem;
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/* this mutex protects the following parameters */
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QemuMutex mutex;
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/* should this thread finish */
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bool quit;
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/* multifd flags for each packet */
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uint32_t flags;
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/* global number of generated multifd packets */
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uint64_t packet_num;
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int pending_job;
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MultiFDRecvData *data;
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/* thread local variables. No locking required */
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/* pointer to the packet */
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MultiFDPacket_t *packet;
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/* size of the next packet that contains pages */
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uint32_t next_packet_size;
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/* packets received through this channel */
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uint64_t packets_recved;
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/* ramblock */
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RAMBlock *block;
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/* ramblock host address */
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uint8_t *host;
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/* non zero pages recv through this channel */
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uint64_t total_normal_pages;
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/* zero pages recv through this channel */
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uint64_t total_zero_pages;
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/* buffers to recv */
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struct iovec *iov;
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/* Pages that are not zero */
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ram_addr_t *normal;
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/* num of non zero pages */
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uint32_t normal_num;
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/* Pages that are zero */
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ram_addr_t *zero;
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/* num of zero pages */
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uint32_t zero_num;
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/* used for de-compression methods */
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void *compress_data;
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} MultiFDRecvParams;
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typedef struct {
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/* Setup for sending side */
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int (*send_setup)(MultiFDSendParams *p, Error **errp);
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/* Cleanup for sending side */
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void (*send_cleanup)(MultiFDSendParams *p, Error **errp);
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/* Prepare the send packet */
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int (*send_prepare)(MultiFDSendParams *p, Error **errp);
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/* Setup for receiving side */
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int (*recv_setup)(MultiFDRecvParams *p, Error **errp);
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/* Cleanup for receiving side */
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void (*recv_cleanup)(MultiFDRecvParams *p);
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/* Read all data */
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int (*recv)(MultiFDRecvParams *p, Error **errp);
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} MultiFDMethods;
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void multifd_register_ops(int method, MultiFDMethods *ops);
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void multifd_send_fill_packet(MultiFDSendParams *p);
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bool multifd_send_prepare_common(MultiFDSendParams *p);
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void multifd_send_zero_page_detect(MultiFDSendParams *p);
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void multifd_recv_zero_page_process(MultiFDRecvParams *p);
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static inline void multifd_send_prepare_header(MultiFDSendParams *p)
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{
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p->iov[0].iov_len = p->packet_len;
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p->iov[0].iov_base = p->packet;
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p->iovs_num++;
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}
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void multifd_channel_connect(MultiFDSendParams *p, QIOChannel *ioc);
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#endif
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