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From ef864989dbe480e952bb3c5ea3cd9dfcf97bd455 Mon Sep 17 00:00:00 2001
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From: Juan Quintela <quintela@redhat.com>
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Date: Wed, 18 May 2022 02:52:24 -0300
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Subject: [PATCH 15/34] multifd: Use a single writev on the send side
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MIME-Version: 1.0
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Content-Type: text/plain; charset=UTF-8
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Content-Transfer-Encoding: 8bit
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RH-Author: Leonardo Brás <leobras@redhat.com>
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RH-MergeRequest: 185: MSG_ZEROCOPY + Multifd @ rhel8.6
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RH-Commit: [15/34] 3e421f67a5f69231280ed748318c0317da31ae95
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RH-Bugzilla: 2117252
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RH-Acked-by: quintela1 <quintela@redhat.com>
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RH-Acked-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
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RH-Acked-by: Peter Xu <peterx@redhat.com>
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Until now, we wrote the packet header with write(), and the rest of the
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pages with writev(). Just increase the size of the iovec and do a
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single writev().
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Signed-off-by: Juan Quintela <quintela@redhat.com>
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Reviewed-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
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(cherry picked from commit d48c3a044537689866fe44e65d24c7d39a68868a)
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Signed-off-by: Leonardo Bras <leobras@redhat.com>
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---
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migration/multifd.c | 20 ++++++++------------
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1 file changed, 8 insertions(+), 12 deletions(-)
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diff --git a/migration/multifd.c b/migration/multifd.c
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index 1e1551d78b..d0f86542b1 100644
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--- a/migration/multifd.c
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+++ b/migration/multifd.c
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@@ -643,7 +643,7 @@ 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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+ p->iovs_num = 1;
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if (used) {
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ret = multifd_send_state->ops->send_prepare(p, &local_err);
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@@ -663,20 +663,15 @@ static void *multifd_send_thread(void *opaque)
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trace_multifd_send(p->id, packet_num, used, flags,
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p->next_packet_size);
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- ret = qio_channel_write_all(p->c, (void *)p->packet,
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- p->packet_len, &local_err);
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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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+
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+ ret = qio_channel_writev_all(p->c, p->iov, p->iovs_num,
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+ &local_err);
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if (ret != 0) {
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break;
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}
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- if (used) {
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- ret = qio_channel_writev_all(p->c, p->iov, p->iovs_num,
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- &local_err);
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- if (ret != 0) {
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- break;
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- }
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- }
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-
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qemu_mutex_lock(&p->mutex);
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p->pending_job--;
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qemu_mutex_unlock(&p->mutex);
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@@ -913,7 +908,8 @@ 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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+ /* We need one extra place for the packet header */
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+ p->iov = g_new0(struct iovec, page_count + 1);
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socket_send_channel_create(multifd_new_send_channel_async, p);
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}
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--
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2.35.3
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