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https://gitlab.com/qemu-project/qemu
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multifd: Move iov from pages to params
This will allow us to reduce the number of system calls on the next patch. Signed-off-by: Juan Quintela <quintela@redhat.com>
This commit is contained in:
Juan Quintela
parent
fc6705229c
commit
226468ba3d
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@ -86,7 +86,16 @@ static void nocomp_send_cleanup(MultiFDSendParams *p, Error **errp)
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*/
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static int nocomp_send_prepare(MultiFDSendParams *p, Error **errp)
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{
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p->next_packet_size = p->pages->num * qemu_target_page_size();
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MultiFDPages_t *pages = p->pages;
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size_t page_size = qemu_target_page_size();
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for (int i = 0; i < p->pages->num; i++) {
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p->iov[p->iovs_num].iov_base = pages->block->host + pages->offset[i];
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p->iov[p->iovs_num].iov_len = page_size;
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p->iovs_num++;
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}
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p->next_packet_size = p->pages->num * page_size;
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p->flags |= MULTIFD_FLAG_NOCOMP;
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return 0;
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}
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@ -104,7 +113,7 @@ static int nocomp_send_prepare(MultiFDSendParams *p, Error **errp)
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*/
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static int nocomp_send_write(MultiFDSendParams *p, uint32_t used, Error **errp)
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{
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return qio_channel_writev_all(p->c, p->pages->iov, used, errp);
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return qio_channel_writev_all(p->c, p->iov, p->iovs_num, errp);
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}
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/**
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@ -146,13 +155,18 @@ static void nocomp_recv_cleanup(MultiFDRecvParams *p)
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static int nocomp_recv_pages(MultiFDRecvParams *p, Error **errp)
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{
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uint32_t flags = p->flags & MULTIFD_FLAG_COMPRESSION_MASK;
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size_t page_size = qemu_target_page_size();
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if (flags != MULTIFD_FLAG_NOCOMP) {
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error_setg(errp, "multifd %u: flags received %x flags expected %x",
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p->id, flags, MULTIFD_FLAG_NOCOMP);
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return -1;
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}
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return qio_channel_readv_all(p->c, p->pages->iov, p->pages->num, errp);
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for (int i = 0; i < p->pages->num; i++) {
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p->iov[i].iov_base = p->pages->block->host + p->pages->offset[i];
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p->iov[i].iov_len = page_size;
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}
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return qio_channel_readv_all(p->c, p->iov, p->pages->num, errp);
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}
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static MultiFDMethods multifd_nocomp_ops = {
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@ -242,7 +256,6 @@ static MultiFDPages_t *multifd_pages_init(size_t size)
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MultiFDPages_t *pages = g_new0(MultiFDPages_t, 1);
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pages->allocated = size;
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pages->iov = g_new0(struct iovec, size);
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pages->offset = g_new0(ram_addr_t, size);
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return pages;
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@ -254,8 +267,6 @@ static void multifd_pages_clear(MultiFDPages_t *pages)
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pages->allocated = 0;
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pages->packet_num = 0;
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pages->block = NULL;
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g_free(pages->iov);
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pages->iov = NULL;
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g_free(pages->offset);
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pages->offset = NULL;
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g_free(pages);
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@ -365,8 +376,6 @@ static int multifd_recv_unfill_packet(MultiFDRecvParams *p, Error **errp)
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return -1;
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}
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p->pages->offset[i] = offset;
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p->pages->iov[i].iov_base = block->host + offset;
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p->pages->iov[i].iov_len = page_size;
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}
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return 0;
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@ -470,8 +479,6 @@ int multifd_queue_page(QEMUFile *f, RAMBlock *block, ram_addr_t offset)
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if (pages->block == block) {
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pages->offset[pages->num] = offset;
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pages->iov[pages->num].iov_base = block->host + offset;
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pages->iov[pages->num].iov_len = qemu_target_page_size();
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pages->num++;
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if (pages->num < pages->allocated) {
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@ -567,6 +574,8 @@ void multifd_save_cleanup(void)
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p->packet_len = 0;
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g_free(p->packet);
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p->packet = NULL;
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g_free(p->iov);
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p->iov = NULL;
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multifd_send_state->ops->send_cleanup(p, &local_err);
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if (local_err) {
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migrate_set_error(migrate_get_current(), local_err);
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@ -654,6 +663,7 @@ static void *multifd_send_thread(void *opaque)
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uint32_t used = p->pages->num;
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uint64_t packet_num = p->packet_num;
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uint32_t flags = p->flags;
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p->iovs_num = 0;
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if (used) {
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ret = multifd_send_state->ops->send_prepare(p, &local_err);
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@ -922,6 +932,7 @@ int multifd_save_setup(Error **errp)
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p->packet->version = cpu_to_be32(MULTIFD_VERSION);
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p->name = g_strdup_printf("multifdsend_%d", i);
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p->tls_hostname = g_strdup(s->hostname);
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p->iov = g_new0(struct iovec, page_count);
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socket_send_channel_create(multifd_new_send_channel_async, p);
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}
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@ -1021,6 +1032,8 @@ int multifd_load_cleanup(Error **errp)
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p->packet_len = 0;
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g_free(p->packet);
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p->packet = NULL;
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g_free(p->iov);
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p->iov = NULL;
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multifd_recv_state->ops->recv_cleanup(p);
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}
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qemu_sem_destroy(&multifd_recv_state->sem_sync);
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@ -1161,6 +1174,7 @@ int multifd_load_setup(Error **errp)
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+ sizeof(uint64_t) * page_count;
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p->packet = g_malloc0(p->packet_len);
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p->name = g_strdup_printf("multifdrecv_%d", i);
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p->iov = g_new0(struct iovec, page_count);
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}
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for (i = 0; i < thread_count; i++) {
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@ -62,8 +62,6 @@ typedef struct {
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uint64_t packet_num;
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/* offset of each page */
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ram_addr_t *offset;
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/* pointer to each page */
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struct iovec *iov;
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RAMBlock *block;
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} MultiFDPages_t;
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@ -110,6 +108,10 @@ typedef struct {
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uint64_t num_pages;
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/* syncs main thread and channels */
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QemuSemaphore sem_sync;
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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 *data;
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} MultiFDSendParams;
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@ -149,6 +151,8 @@ typedef struct {
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uint64_t num_pages;
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/* syncs main thread and channels */
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QemuSemaphore sem_sync;
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/* buffers to recv */
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struct iovec *iov;
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/* used for de-compression methods */
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void *data;
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} MultiFDRecvParams;
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