diff mbox series

[v3,09/14] migration/multifd: Isolate ram pages packet data

Message ID 20240801123516.4498-10-farosas@suse.de (mailing list archive)
State New, archived
Headers show
Series migration/multifd: Remove multifd_send_state->pages | expand

Commit Message

Fabiano Rosas Aug. 1, 2024, 12:35 p.m. UTC 
While we cannot yet disentangle the multifd packet from page data, we
can make the code a bit cleaner by setting the page-related fields in
a separate function.

Signed-off-by: Fabiano Rosas <farosas@suse.de>
---
 migration/multifd.c    | 110 ++++++++++++++++++++++++-----------------
 migration/trace-events |   9 ++--
 2 files changed, 70 insertions(+), 49 deletions(-)

Comments

Peter Xu Aug. 21, 2024, 9:38 p.m. UTC | #1 
On Thu, Aug 01, 2024 at 09:35:11AM -0300, Fabiano Rosas wrote:
> @@ -1554,7 +1577,6 @@ static void *multifd_recv_thread(void *opaque)
>                  qemu_sem_wait(&p->sem_sync);
>              }
>          } else {
> -            p->total_normal_pages += p->data->size / qemu_target_page_size();

Is this line dropped by accident?

>              p->data->size = 0;
>              /*
>               * Order data->size update before clearing
Fabiano Rosas Aug. 22, 2024, 2:13 p.m. UTC | #2 
Peter Xu <peterx@redhat.com> writes:

> On Thu, Aug 01, 2024 at 09:35:11AM -0300, Fabiano Rosas wrote:
>> @@ -1554,7 +1577,6 @@ static void *multifd_recv_thread(void *opaque)
>>                  qemu_sem_wait(&p->sem_sync);
>>              }
>>          } else {
>> -            p->total_normal_pages += p->data->size / qemu_target_page_size();
>
> Is this line dropped by accident?
>

No, this was just used in the tracepoint below. I stopped including this
information there.

>>              p->data->size = 0;
>>              /*
>>               * Order data->size update before clearing
Peter Xu Aug. 22, 2024, 2:30 p.m. UTC | #3 
On Thu, Aug 22, 2024 at 11:13:36AM -0300, Fabiano Rosas wrote:
> Peter Xu <peterx@redhat.com> writes:
> 
> > On Thu, Aug 01, 2024 at 09:35:11AM -0300, Fabiano Rosas wrote:
> >> @@ -1554,7 +1577,6 @@ static void *multifd_recv_thread(void *opaque)
> >>                  qemu_sem_wait(&p->sem_sync);
> >>              }
> >>          } else {
> >> -            p->total_normal_pages += p->data->size / qemu_target_page_size();
> >
> > Is this line dropped by accident?
> >
> 
> No, this was just used in the tracepoint below. I stopped including this
> information there.

But this will cause socket / file paths not doing the same thing, since
this counter should still be increamented in socket path (and this is the
file path).

Either we keep it the same as before, or.. if we want to drop it, shouldn't
we remove all instead (along with the two variables "total_normal_pages /
total_zero_pages")?
Fabiano Rosas Aug. 22, 2024, 2:55 p.m. UTC | #4 
Peter Xu <peterx@redhat.com> writes:

> On Thu, Aug 22, 2024 at 11:13:36AM -0300, Fabiano Rosas wrote:
>> Peter Xu <peterx@redhat.com> writes:
>> 
>> > On Thu, Aug 01, 2024 at 09:35:11AM -0300, Fabiano Rosas wrote:
>> >> @@ -1554,7 +1577,6 @@ static void *multifd_recv_thread(void *opaque)
>> >>                  qemu_sem_wait(&p->sem_sync);
>> >>              }
>> >>          } else {
>> >> -            p->total_normal_pages += p->data->size / qemu_target_page_size();
>> >
>> > Is this line dropped by accident?
>> >
>> 
>> No, this was just used in the tracepoint below. I stopped including this
>> information there.
>
> But this will cause socket / file paths not doing the same thing, since
> this counter should still be increamented in socket path (and this is the
> file path).
>
> Either we keep it the same as before, or.. if we want to drop it, shouldn't
> we remove all instead (along with the two variables "total_normal_pages /
> total_zero_pages")?

I'll just remove them. There's not much point in these anyway since
they are per-channel.
diff mbox series

Patch

diff --git a/migration/multifd.c b/migration/multifd.c
index 739fc01cbe..7d946e6661 100644
--- a/migration/multifd.c
+++ b/migration/multifd.c
@@ -424,67 +424,65 @@  static int multifd_recv_initial_packet(QIOChannel *c, Error **errp)
     return msg.id;
 }
 
-void multifd_send_fill_packet(MultiFDSendParams *p)
+static void multifd_ram_fill_packet(MultiFDSendParams *p)
 {
     MultiFDPacket_t *packet = p->packet;
     MultiFDPages_t *pages = &p->data->u.ram;
-    uint64_t packet_num;
     uint32_t zero_num = pages->num - pages->normal_num;
-    int i;
 
-    packet->flags = cpu_to_be32(p->flags);
     packet->pages_alloc = cpu_to_be32(multifd_ram_page_count());
     packet->normal_pages = cpu_to_be32(pages->normal_num);
     packet->zero_pages = cpu_to_be32(zero_num);
-    packet->next_packet_size = cpu_to_be32(p->next_packet_size);
-
-    packet_num = qatomic_fetch_inc(&multifd_send_state->packet_num);
-    packet->packet_num = cpu_to_be64(packet_num);
 
     if (pages->block) {
         strncpy(packet->ramblock, pages->block->idstr, 256);
     }
 
-    for (i = 0; i < pages->num; i++) {
+    for (int i = 0; i < pages->num; i++) {
         /* there are architectures where ram_addr_t is 32 bit */
         uint64_t temp = pages->offset[i];
 
         packet->offset[i] = cpu_to_be64(temp);
     }
 
-    p->packets_sent++;
     p->total_normal_pages += pages->normal_num;
     p->total_zero_pages += zero_num;
 
-    trace_multifd_send(p->id, packet_num, pages->normal_num, zero_num,
-                       p->flags, p->next_packet_size);
+    trace_multifd_send_ram_fill(p->id, p->total_normal_pages,
+                                p->total_zero_pages);
 }
 
-static int multifd_recv_unfill_packet(MultiFDRecvParams *p, Error **errp)
+void multifd_send_fill_packet(MultiFDSendParams *p)
+{
+    MultiFDPacket_t *packet = p->packet;
+    uint64_t packet_num;
+
+    memset(packet, 0, p->packet_len);
+
+    packet->magic = cpu_to_be32(MULTIFD_MAGIC);
+    packet->version = cpu_to_be32(MULTIFD_VERSION);
+
+    packet->flags = cpu_to_be32(p->flags);
+    packet->next_packet_size = cpu_to_be32(p->next_packet_size);
+
+    packet_num = qatomic_fetch_inc(&multifd_send_state->packet_num);
+    packet->packet_num = cpu_to_be64(packet_num);
+
+    p->packets_sent++;
+
+    multifd_ram_fill_packet(p);
+
+    trace_multifd_send_fill(p->id, packet_num,
+                            p->flags, p->next_packet_size);
+}
+
+static int multifd_ram_unfill_packet(MultiFDRecvParams *p, Error **errp)
 {
     MultiFDPacket_t *packet = p->packet;
     uint32_t page_count = multifd_ram_page_count();
     uint32_t page_size = multifd_ram_page_size();
     int i;
 
-    packet->magic = be32_to_cpu(packet->magic);
-    if (packet->magic != MULTIFD_MAGIC) {
-        error_setg(errp, "multifd: received packet "
-                   "magic %x and expected magic %x",
-                   packet->magic, MULTIFD_MAGIC);
-        return -1;
-    }
-
-    packet->version = be32_to_cpu(packet->version);
-    if (packet->version != MULTIFD_VERSION) {
-        error_setg(errp, "multifd: received packet "
-                   "version %u and expected version %u",
-                   packet->version, MULTIFD_VERSION);
-        return -1;
-    }
-
-    p->flags = be32_to_cpu(packet->flags);
-
     packet->pages_alloc = be32_to_cpu(packet->pages_alloc);
     /*
      * If we received a packet that is 100 times bigger than expected
@@ -513,15 +511,9 @@  static int multifd_recv_unfill_packet(MultiFDRecvParams *p, Error **errp)
         return -1;
     }
 
-    p->next_packet_size = be32_to_cpu(packet->next_packet_size);
-    p->packet_num = be64_to_cpu(packet->packet_num);
-    p->packets_recved++;
     p->total_normal_pages += p->normal_num;
     p->total_zero_pages += p->zero_num;
 
-    trace_multifd_recv(p->id, p->packet_num, p->normal_num, p->zero_num,
-                       p->flags, p->next_packet_size);
-
     if (p->normal_num == 0 && p->zero_num == 0) {
         return 0;
     }
@@ -563,6 +555,40 @@  static int multifd_recv_unfill_packet(MultiFDRecvParams *p, Error **errp)
     return 0;
 }
 
+static int multifd_recv_unfill_packet(MultiFDRecvParams *p, Error **errp)
+{
+    MultiFDPacket_t *packet = p->packet;
+    int ret = 0;
+
+    packet->magic = be32_to_cpu(packet->magic);
+    if (packet->magic != MULTIFD_MAGIC) {
+        error_setg(errp, "multifd: received packet "
+                   "magic %x and expected magic %x",
+                   packet->magic, MULTIFD_MAGIC);
+        return -1;
+    }
+
+    packet->version = be32_to_cpu(packet->version);
+    if (packet->version != MULTIFD_VERSION) {
+        error_setg(errp, "multifd: received packet "
+                   "version %u and expected version %u",
+                   packet->version, MULTIFD_VERSION);
+        return -1;
+    }
+
+    p->flags = be32_to_cpu(packet->flags);
+    p->next_packet_size = be32_to_cpu(packet->next_packet_size);
+    p->packet_num = be64_to_cpu(packet->packet_num);
+    p->packets_recved++;
+
+    ret = multifd_ram_unfill_packet(p, errp);
+
+    trace_multifd_recv_unfill(p->id, p->packet_num, p->flags,
+                              p->next_packet_size);
+
+    return ret;
+}
+
 static bool multifd_send_should_exit(void)
 {
     return qatomic_read(&multifd_send_state->exiting);
@@ -1036,8 +1062,7 @@  out:
 
     rcu_unregister_thread();
     migration_threads_remove(thread);
-    trace_multifd_send_thread_end(p->id, p->packets_sent, p->total_normal_pages,
-                                  p->total_zero_pages);
+    trace_multifd_send_thread_end(p->id, p->packets_sent);
 
     return NULL;
 }
@@ -1207,8 +1232,6 @@  bool multifd_send_setup(void)
             p->packet_len = sizeof(MultiFDPacket_t)
                           + sizeof(uint64_t) * page_count;
             p->packet = g_malloc0(p->packet_len);
-            p->packet->magic = cpu_to_be32(MULTIFD_MAGIC);
-            p->packet->version = cpu_to_be32(MULTIFD_VERSION);
         }
         p->name = g_strdup_printf("mig/src/send_%d", i);
         p->write_flags = 0;
@@ -1554,7 +1577,6 @@  static void *multifd_recv_thread(void *opaque)
                 qemu_sem_wait(&p->sem_sync);
             }
         } else {
-            p->total_normal_pages += p->data->size / qemu_target_page_size();
             p->data->size = 0;
             /*
              * Order data->size update before clearing
@@ -1571,9 +1593,7 @@  static void *multifd_recv_thread(void *opaque)
     }
 
     rcu_unregister_thread();
-    trace_multifd_recv_thread_end(p->id, p->packets_recved,
-                                  p->total_normal_pages,
-                                  p->total_zero_pages);
+    trace_multifd_recv_thread_end(p->id, p->packets_recved);
 
     return NULL;
 }
diff --git a/migration/trace-events b/migration/trace-events
index 0b7c3324fb..c65902f042 100644
--- a/migration/trace-events
+++ b/migration/trace-events
@@ -128,21 +128,22 @@  postcopy_preempt_reset_channel(void) ""
 # multifd.c
 multifd_new_send_channel_async(uint8_t id) "channel %u"
 multifd_new_send_channel_async_error(uint8_t id, void *err) "channel=%u err=%p"
-multifd_recv(uint8_t id, uint64_t packet_num, uint32_t normal, uint32_t zero, uint32_t flags, uint32_t next_packet_size) "channel %u packet_num %" PRIu64 " normal pages %u zero pages %u flags 0x%x next packet size %u"
+multifd_recv_unfill(uint8_t id, uint64_t packet_num, uint32_t flags, uint32_t next_packet_size) "channel %u packet_num %" PRIu64 " flags 0x%x next packet size %u"
 multifd_recv_new_channel(uint8_t id) "channel %u"
 multifd_recv_sync_main(long packet_num) "packet num %ld"
 multifd_recv_sync_main_signal(uint8_t id) "channel %u"
 multifd_recv_sync_main_wait(uint8_t id) "iter %u"
 multifd_recv_terminate_threads(bool error) "error %d"
-multifd_recv_thread_end(uint8_t id, uint64_t packets, uint64_t normal_pages, uint64_t zero_pages) "channel %u packets %" PRIu64 " normal pages %" PRIu64 " zero pages %" PRIu64
+multifd_recv_thread_end(uint8_t id, uint64_t packets) "channel %u packets %" PRIu64
 multifd_recv_thread_start(uint8_t id) "%u"
-multifd_send(uint8_t id, uint64_t packet_num, uint32_t normal_pages, uint32_t zero_pages, uint32_t flags, uint32_t next_packet_size) "channel %u packet_num %" PRIu64 " normal pages %u zero pages %u flags 0x%x next packet size %u"
+multifd_send_fill(uint8_t id, uint64_t packet_num, uint32_t flags, uint32_t next_packet_size) "channel %u packet_num %" PRIu64 " flags 0x%x next packet size %u"
+multifd_send_ram_fill(uint8_t id, uint32_t normal, uint32_t zero) "channel %u normal pages %u zero pages %u"
 multifd_send_error(uint8_t id) "channel %u"
 multifd_send_sync_main(long packet_num) "packet num %ld"
 multifd_send_sync_main_signal(uint8_t id) "channel %u"
 multifd_send_sync_main_wait(uint8_t id) "channel %u"
 multifd_send_terminate_threads(void) ""
-multifd_send_thread_end(uint8_t id, uint64_t packets, uint64_t normal_pages, uint64_t zero_pages) "channel %u packets %" PRIu64 " normal pages %"  PRIu64 " zero pages %"  PRIu64
+multifd_send_thread_end(uint8_t id, uint64_t packets) "channel %u packets %" PRIu64
 multifd_send_thread_start(uint8_t id) "%u"
 multifd_tls_outgoing_handshake_start(void *ioc, void *tioc, const char *hostname) "ioc=%p tioc=%p hostname=%s"
 multifd_tls_outgoing_handshake_error(void *ioc, const char *err) "ioc=%p err=%s"