migration/multifd-zlib.c | 6 +++--- migration/multifd-zstd.c | 6 +++--- migration/multifd.c | 25 ++++++++++--------------- 3 files changed, 16 insertions(+), 21 deletions(-)
All pages which are going to be migrated are first added to
MultiFDSendParams::MultiFDPages_t::offset array by the main migration
thread and are subsequently copied to MultiFDSendParams::normal by the
multifd thread. This is really unnecessary as the MultiFDPages_t is
guaranteed to be stable since its mutex is being held. Additionally,
this somewhat simplifies the code as the migration pages are now kept
in only 1 place during send, also the name 'offset' coupled with the
context it's being used - usually added to the host pages makes it
obvious that this is an offset.
With this change normal/normal_num are no longer used in the multifd
send path.
Signed-off-by: Nikolay Borisov <nborisov@suse.com>
---
migration/multifd-zlib.c | 6 +++---
migration/multifd-zstd.c | 6 +++---
migration/multifd.c | 25 ++++++++++---------------
3 files changed, 16 insertions(+), 21 deletions(-)
diff --git a/migration/multifd-zlib.c b/migration/multifd-zlib.c
index 18213a951302..363b64e95922 100644
--- a/migration/multifd-zlib.c
+++ b/migration/multifd-zlib.c
@@ -122,11 +122,11 @@ static int zlib_send_prepare(MultiFDSendParams *p, Error **errp)
int ret;
uint32_t i;
- for (i = 0; i < p->normal_num; i++) {
+ for (i = 0; i < p->pages->num; i++) {
uint32_t available = z->zbuff_len - out_size;
int flush = Z_NO_FLUSH;
- if (i == p->normal_num - 1) {
+ if (i == p->pages->num - 1) {
flush = Z_SYNC_FLUSH;
}
@@ -135,7 +135,7 @@ static int zlib_send_prepare(MultiFDSendParams *p, Error **errp)
* with compression. zlib does not guarantee that this is safe,
* therefore copy the page before calling deflate().
*/
- memcpy(z->buf, p->pages->block->host + p->normal[i], page_size);
+ memcpy(z->buf, p->pages->block->host + p->pages->offset[i], page_size);
zs->avail_in = page_size;
zs->next_in = z->buf;
diff --git a/migration/multifd-zstd.c b/migration/multifd-zstd.c
index d788d309f22e..4daec8366727 100644
--- a/migration/multifd-zstd.c
+++ b/migration/multifd-zstd.c
@@ -121,13 +121,13 @@ static int zstd_send_prepare(MultiFDSendParams *p, Error **errp)
z->out.size = z->zbuff_len;
z->out.pos = 0;
- for (i = 0; i < p->normal_num; i++) {
+ for (i = 0; i < p->pages->num; i++) {
ZSTD_EndDirective flush = ZSTD_e_continue;
- if (i == p->normal_num - 1) {
+ if (i == p->pages->num - 1) {
flush = ZSTD_e_flush;
}
- z->in.src = p->pages->block->host + p->normal[i];
+ z->in.src = p->pages->block->host + p->pages->offset[i];
z->in.size = page_size;
z->in.pos = 0;
diff --git a/migration/multifd.c b/migration/multifd.c
index 586ddc9d657a..d70662406490 100644
--- a/migration/multifd.c
+++ b/migration/multifd.c
@@ -89,13 +89,13 @@ static int nocomp_send_prepare(MultiFDSendParams *p, Error **errp)
MultiFDPages_t *pages = p->pages;
size_t page_size = qemu_target_page_size();
- for (int i = 0; i < p->normal_num; i++) {
- p->iov[p->iovs_num].iov_base = pages->block->host + p->normal[i];
+ for (int i = 0; i < pages->num; i++) {
+ p->iov[p->iovs_num].iov_base = pages->block->host + pages->offset[i];
p->iov[p->iovs_num].iov_len = page_size;
p->iovs_num++;
}
- p->next_packet_size = p->normal_num * page_size;
+ p->next_packet_size = pages->num * page_size;
p->flags |= MULTIFD_FLAG_NOCOMP;
return 0;
}
@@ -262,7 +262,7 @@ static void multifd_send_fill_packet(MultiFDSendParams *p)
packet->flags = cpu_to_be32(p->flags);
packet->pages_alloc = cpu_to_be32(p->pages->allocated);
- packet->normal_pages = cpu_to_be32(p->normal_num);
+ packet->normal_pages = cpu_to_be32(p->pages->num);
packet->next_packet_size = cpu_to_be32(p->next_packet_size);
packet->packet_num = cpu_to_be64(p->packet_num);
@@ -270,9 +270,9 @@ static void multifd_send_fill_packet(MultiFDSendParams *p)
strncpy(packet->ramblock, p->pages->block->idstr, 256);
}
- for (i = 0; i < p->normal_num; i++) {
+ for (i = 0; i < p->pages->num; i++) {
/* there are architectures where ram_addr_t is 32 bit */
- uint64_t temp = p->normal[i];
+ uint64_t temp = p->pages->offset[i];
packet->offset[i] = cpu_to_be64(temp);
}
@@ -668,7 +668,7 @@ static void *multifd_send_thread(void *opaque)
if (p->pending_job) {
uint64_t packet_num = p->packet_num;
uint32_t flags = p->flags;
- p->normal_num = 0;
+ uint32_t num_pages = p->pages->num;
if (use_zero_copy_send) {
p->iovs_num = 0;
@@ -676,12 +676,7 @@ static void *multifd_send_thread(void *opaque)
p->iovs_num = 1;
}
- for (int i = 0; i < p->pages->num; i++) {
- p->normal[p->normal_num] = p->pages->offset[i];
- p->normal_num++;
- }
-
- if (p->normal_num) {
+ if (num_pages) {
ret = multifd_send_state->ops->send_prepare(p, &local_err);
if (ret != 0) {
qemu_mutex_unlock(&p->mutex);
@@ -691,12 +686,12 @@ static void *multifd_send_thread(void *opaque)
multifd_send_fill_packet(p);
p->flags = 0;
p->num_packets++;
- p->total_normal_pages += p->normal_num;
+ p->total_normal_pages += num_pages;
p->pages->num = 0;
p->pages->block = NULL;
qemu_mutex_unlock(&p->mutex);
- trace_multifd_send(p->id, packet_num, p->normal_num, flags,
+ trace_multifd_send(p->id, packet_num, num_pages, flags,
p->next_packet_size);
if (use_zero_copy_send) {
--
2.25.1
Copying in the two migration maintainers. On Wed, Aug 10, 2022 at 01:39:42PM +0300, Nikolay Borisov wrote: > All pages which are going to be migrated are first added to > MultiFDSendParams::MultiFDPages_t::offset array by the main migration > thread and are subsequently copied to MultiFDSendParams::normal by the > multifd thread. This is really unnecessary as the MultiFDPages_t is > guaranteed to be stable since its mutex is being held. Additionally, > this somewhat simplifies the code as the migration pages are now kept > in only 1 place during send, also the name 'offset' coupled with the > context it's being used - usually added to the host pages makes it > obvious that this is an offset. > > With this change normal/normal_num are no longer used in the multifd > send path. > > Signed-off-by: Nikolay Borisov <nborisov@suse.com> > --- > migration/multifd-zlib.c | 6 +++--- > migration/multifd-zstd.c | 6 +++--- > migration/multifd.c | 25 ++++++++++--------------- > 3 files changed, 16 insertions(+), 21 deletions(-) > > diff --git a/migration/multifd-zlib.c b/migration/multifd-zlib.c > index 18213a951302..363b64e95922 100644 > --- a/migration/multifd-zlib.c > +++ b/migration/multifd-zlib.c > @@ -122,11 +122,11 @@ static int zlib_send_prepare(MultiFDSendParams *p, Error **errp) > int ret; > uint32_t i; > > - for (i = 0; i < p->normal_num; i++) { > + for (i = 0; i < p->pages->num; i++) { > uint32_t available = z->zbuff_len - out_size; > int flush = Z_NO_FLUSH; > > - if (i == p->normal_num - 1) { > + if (i == p->pages->num - 1) { > flush = Z_SYNC_FLUSH; > } > > @@ -135,7 +135,7 @@ static int zlib_send_prepare(MultiFDSendParams *p, Error **errp) > * with compression. zlib does not guarantee that this is safe, > * therefore copy the page before calling deflate(). > */ > - memcpy(z->buf, p->pages->block->host + p->normal[i], page_size); > + memcpy(z->buf, p->pages->block->host + p->pages->offset[i], page_size); > zs->avail_in = page_size; > zs->next_in = z->buf; > > diff --git a/migration/multifd-zstd.c b/migration/multifd-zstd.c > index d788d309f22e..4daec8366727 100644 > --- a/migration/multifd-zstd.c > +++ b/migration/multifd-zstd.c > @@ -121,13 +121,13 @@ static int zstd_send_prepare(MultiFDSendParams *p, Error **errp) > z->out.size = z->zbuff_len; > z->out.pos = 0; > > - for (i = 0; i < p->normal_num; i++) { > + for (i = 0; i < p->pages->num; i++) { > ZSTD_EndDirective flush = ZSTD_e_continue; > > - if (i == p->normal_num - 1) { > + if (i == p->pages->num - 1) { > flush = ZSTD_e_flush; > } > - z->in.src = p->pages->block->host + p->normal[i]; > + z->in.src = p->pages->block->host + p->pages->offset[i]; > z->in.size = page_size; > z->in.pos = 0; > > diff --git a/migration/multifd.c b/migration/multifd.c > index 586ddc9d657a..d70662406490 100644 > --- a/migration/multifd.c > +++ b/migration/multifd.c > @@ -89,13 +89,13 @@ static int nocomp_send_prepare(MultiFDSendParams *p, Error **errp) > MultiFDPages_t *pages = p->pages; > size_t page_size = qemu_target_page_size(); > > - for (int i = 0; i < p->normal_num; i++) { > - p->iov[p->iovs_num].iov_base = pages->block->host + p->normal[i]; > + for (int i = 0; i < pages->num; i++) { > + p->iov[p->iovs_num].iov_base = pages->block->host + pages->offset[i]; > p->iov[p->iovs_num].iov_len = page_size; > p->iovs_num++; > } > > - p->next_packet_size = p->normal_num * page_size; > + p->next_packet_size = pages->num * page_size; > p->flags |= MULTIFD_FLAG_NOCOMP; > return 0; > } > @@ -262,7 +262,7 @@ static void multifd_send_fill_packet(MultiFDSendParams *p) > > packet->flags = cpu_to_be32(p->flags); > packet->pages_alloc = cpu_to_be32(p->pages->allocated); > - packet->normal_pages = cpu_to_be32(p->normal_num); > + packet->normal_pages = cpu_to_be32(p->pages->num); > packet->next_packet_size = cpu_to_be32(p->next_packet_size); > packet->packet_num = cpu_to_be64(p->packet_num); > > @@ -270,9 +270,9 @@ static void multifd_send_fill_packet(MultiFDSendParams *p) > strncpy(packet->ramblock, p->pages->block->idstr, 256); > } > > - for (i = 0; i < p->normal_num; i++) { > + for (i = 0; i < p->pages->num; i++) { > /* there are architectures where ram_addr_t is 32 bit */ > - uint64_t temp = p->normal[i]; > + uint64_t temp = p->pages->offset[i]; > > packet->offset[i] = cpu_to_be64(temp); > } > @@ -668,7 +668,7 @@ static void *multifd_send_thread(void *opaque) > if (p->pending_job) { > uint64_t packet_num = p->packet_num; > uint32_t flags = p->flags; > - p->normal_num = 0; > + uint32_t num_pages = p->pages->num; > > if (use_zero_copy_send) { > p->iovs_num = 0; > @@ -676,12 +676,7 @@ static void *multifd_send_thread(void *opaque) > p->iovs_num = 1; > } > > - for (int i = 0; i < p->pages->num; i++) { > - p->normal[p->normal_num] = p->pages->offset[i]; > - p->normal_num++; > - } > - > - if (p->normal_num) { > + if (num_pages) { > ret = multifd_send_state->ops->send_prepare(p, &local_err); > if (ret != 0) { > qemu_mutex_unlock(&p->mutex); > @@ -691,12 +686,12 @@ static void *multifd_send_thread(void *opaque) > multifd_send_fill_packet(p); > p->flags = 0; > p->num_packets++; > - p->total_normal_pages += p->normal_num; > + p->total_normal_pages += num_pages; > p->pages->num = 0; > p->pages->block = NULL; > qemu_mutex_unlock(&p->mutex); > > - trace_multifd_send(p->id, packet_num, p->normal_num, flags, > + trace_multifd_send(p->id, packet_num, num_pages, flags, > p->next_packet_size); > > if (use_zero_copy_send) { > -- > 2.25.1 > > With regards, Daniel -- |: https://berrange.com -o- https://www.flickr.com/photos/dberrange :| |: https://libvirt.org -o- https://fstop138.berrange.com :| |: https://entangle-photo.org -o- https://www.instagram.com/dberrange :|
On 10.08.22 г. 13:39 ч., Nikolay Borisov wrote: > All pages which are going to be migrated are first added to > MultiFDSendParams::MultiFDPages_t::offset array by the main migration > thread and are subsequently copied to MultiFDSendParams::normal by the > multifd thread. This is really unnecessary as the MultiFDPages_t is > guaranteed to be stable since its mutex is being held. Additionally, > this somewhat simplifies the code as the migration pages are now kept > in only 1 place during send, also the name 'offset' coupled with the > context it's being used - usually added to the host pages makes it > obvious that this is an offset. > > With this change normal/normal_num are no longer used in the multifd > send path. > > Signed-off-by: Nikolay Borisov <nborisov@suse.com> Ping
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