Commit 1b81c974 authored by Ivan Ren's avatar Ivan Ren Committed by Dr. David Alan Gilbert
Browse files

migration: add speed limit for multifd migration 



Limit the speed of multifd migration through common speed limitation
qemu file.

Signed-off-by: default avatarIvan Ren <ivanren@tencent.com>
Message-Id: <1564464816-21804-3-git-send-email-ivanren@tencent.com>
Reviewed-by: default avatarWei Yang <richardw.yang@linux.intel.com>
Reviewed-by: default avatarJuan Quintela <quintela@redhat.com>
Signed-off-by: default avatarDr. David Alan Gilbert <dgilbert@redhat.com>
parent 5d7d2558

migration/ram.c

+12 −10
Original line number Diff line number Diff line
@@ -922,7 +922,7 @@ struct { 
 * false.

 */



static int multifd_send_pages(void)

static int multifd_send_pages(RAMState *rs)

{

    int i;

    static int next_channel;
@@ -954,6 +954,7 @@ static int multifd_send_pages(void) 
    multifd_send_state->pages = p->pages;

    p->pages = pages;

    transferred = ((uint64_t) pages->used) * TARGET_PAGE_SIZE + p->packet_len;

    qemu_file_update_transfer(rs->f, transferred);

    ram_counters.multifd_bytes += transferred;

    ram_counters.transferred += transferred;;

    qemu_mutex_unlock(&p->mutex);
@@ -962,7 +963,7 @@ static int multifd_send_pages(void) 
    return 1;

}



static int multifd_queue_page(RAMBlock *block, ram_addr_t offset)

static int multifd_queue_page(RAMState *rs, RAMBlock *block, ram_addr_t offset)

{

    MultiFDPages_t *pages = multifd_send_state->pages;
@@ -981,12 +982,12 @@ static int multifd_queue_page(RAMBlock *block, ram_addr_t offset) 
        }

    }



    if (multifd_send_pages() < 0) {

    if (multifd_send_pages(rs) < 0) {

        return -1;

    }



    if (pages->block != block) {

        return  multifd_queue_page(block, offset);

        return  multifd_queue_page(rs, block, offset);

    }



    return 1;
@@ -1054,7 +1055,7 @@ void multifd_save_cleanup(void) 
    multifd_send_state = NULL;

}



static void multifd_send_sync_main(void)

static void multifd_send_sync_main(RAMState *rs)

{

    int i;
@@ -1062,7 +1063,7 @@ static void multifd_send_sync_main(void) 
        return;

    }

    if (multifd_send_state->pages->used) {

        if (multifd_send_pages() < 0) {

        if (multifd_send_pages(rs) < 0) {

            error_report("%s: multifd_send_pages fail", __func__);

            return;

        }
@@ -1083,6 +1084,7 @@ static void multifd_send_sync_main(void) 
        p->packet_num = multifd_send_state->packet_num++;

        p->flags |= MULTIFD_FLAG_SYNC;

        p->pending_job++;

        qemu_file_update_transfer(rs->f, p->packet_len);

        qemu_mutex_unlock(&p->mutex);

        qemu_sem_post(&p->sem);

    }
@@ -2078,7 +2080,7 @@ static int ram_save_page(RAMState *rs, PageSearchStatus *pss, bool last_stage) 
static int ram_save_multifd_page(RAMState *rs, RAMBlock *block,

                                 ram_addr_t offset)

{

    if (multifd_queue_page(block, offset) < 0) {

    if (multifd_queue_page(rs, block, offset) < 0) {

        return -1;

    }

    ram_counters.normal++;
@@ -3447,7 +3449,7 @@ static int ram_save_setup(QEMUFile *f, void *opaque) 
    ram_control_before_iterate(f, RAM_CONTROL_SETUP);

    ram_control_after_iterate(f, RAM_CONTROL_SETUP);



    multifd_send_sync_main();

    multifd_send_sync_main(*rsp);

    qemu_put_be64(f, RAM_SAVE_FLAG_EOS);

    qemu_fflush(f);
@@ -3535,7 +3537,7 @@ static int ram_save_iterate(QEMUFile *f, void *opaque) 
    ram_control_after_iterate(f, RAM_CONTROL_ROUND);



out:

    multifd_send_sync_main();

    multifd_send_sync_main(rs);

    qemu_put_be64(f, RAM_SAVE_FLAG_EOS);

    qemu_fflush(f);

    ram_counters.transferred += 8;
@@ -3594,7 +3596,7 @@ static int ram_save_complete(QEMUFile *f, void *opaque) 


    rcu_read_unlock();



    multifd_send_sync_main();

    multifd_send_sync_main(rs);

    qemu_put_be64(f, RAM_SAVE_FLAG_EOS);

    qemu_fflush(f);