[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
Re: [Qemu-devel] [PATCH v5 20/45] Modify savevm handlers for postcopy
From: |
David Gibson |
Subject: |
Re: [Qemu-devel] [PATCH v5 20/45] Modify savevm handlers for postcopy |
Date: |
Fri, 13 Mar 2015 12:00:58 +1100 |
User-agent: |
Mutt/1.5.23 (2014-03-12) |
On Wed, Feb 25, 2015 at 04:51:43PM +0000, Dr. David Alan Gilbert (git) wrote:
> From: "Dr. David Alan Gilbert" <address@hidden>
>
> Modify save_live_pending to return separate postcopiable and
> non-postcopiable counts.
>
> Add 'can_postcopy' to allow a device to state if it can postcopy
What's the purpose of the can_postcopy callback? There are no callers
in this patch - is it still necessary with the change to
save_live_pending?
>
> Signed-off-by: Dr. David Alan Gilbert <address@hidden>
> ---
> arch_init.c | 15 +++++++++++++--
> include/migration/vmstate.h | 10 ++++++++--
> include/sysemu/sysemu.h | 4 +++-
> migration/block.c | 7 +++++--
> migration/migration.c | 9 +++++++--
> savevm.c | 21 +++++++++++++++++----
> trace-events | 2 +-
> 7 files changed, 54 insertions(+), 14 deletions(-)
>
> diff --git a/arch_init.c b/arch_init.c
> index fe0df0d..7bc5fa6 100644
> --- a/arch_init.c
> +++ b/arch_init.c
> @@ -997,7 +997,9 @@ static int ram_save_complete(QEMUFile *f, void *opaque)
> return 0;
> }
>
> -static uint64_t ram_save_pending(QEMUFile *f, void *opaque, uint64_t
> max_size)
> +static void ram_save_pending(QEMUFile *f, void *opaque, uint64_t max_size,
> + uint64_t *non_postcopiable_pending,
> + uint64_t *postcopiable_pending)
> {
> uint64_t remaining_size;
>
> @@ -1009,7 +1011,9 @@ static uint64_t ram_save_pending(QEMUFile *f, void
> *opaque, uint64_t max_size)
> qemu_mutex_unlock_iothread();
> remaining_size = ram_save_remaining() * TARGET_PAGE_SIZE;
> }
> - return remaining_size;
> +
> + *non_postcopiable_pending = 0;
> + *postcopiable_pending = remaining_size;
> }
>
> static int load_xbzrle(QEMUFile *f, ram_addr_t addr, void *host)
> @@ -1204,6 +1208,12 @@ static int ram_load(QEMUFile *f, void *opaque, int
> version_id)
> return ret;
> }
>
> +/* RAM's always up for postcopying */
> +static bool ram_can_postcopy(void *opaque)
> +{
> + return true;
> +}
> +
> static SaveVMHandlers savevm_ram_handlers = {
> .save_live_setup = ram_save_setup,
> .save_live_iterate = ram_save_iterate,
> @@ -1211,6 +1221,7 @@ static SaveVMHandlers savevm_ram_handlers = {
> .save_live_pending = ram_save_pending,
> .load_state = ram_load,
> .cancel = ram_migration_cancel,
> + .can_postcopy = ram_can_postcopy,
> };
>
> void ram_mig_init(void)
> diff --git a/include/migration/vmstate.h b/include/migration/vmstate.h
> index 18da207..c9ec74a 100644
> --- a/include/migration/vmstate.h
> +++ b/include/migration/vmstate.h
> @@ -54,8 +54,14 @@ typedef struct SaveVMHandlers {
>
> /* This runs outside the iothread lock! */
> int (*save_live_setup)(QEMUFile *f, void *opaque);
> - uint64_t (*save_live_pending)(QEMUFile *f, void *opaque, uint64_t
> max_size);
> -
> + /*
> + * postcopiable_pending must return 0 unless the can_postcopy
> + * handler returns true.
> + */
> + void (*save_live_pending)(QEMUFile *f, void *opaque, uint64_t max_size,
> + uint64_t *non_postcopiable_pending,
> + uint64_t *postcopiable_pending);
> + bool (*can_postcopy)(void *opaque);
> LoadStateHandler *load_state;
> } SaveVMHandlers;
>
> diff --git a/include/sysemu/sysemu.h b/include/sysemu/sysemu.h
> index e83bf80..5f518b3 100644
> --- a/include/sysemu/sysemu.h
> +++ b/include/sysemu/sysemu.h
> @@ -111,7 +111,9 @@ void qemu_savevm_state_header(QEMUFile *f);
> int qemu_savevm_state_iterate(QEMUFile *f);
> void qemu_savevm_state_complete(QEMUFile *f);
> void qemu_savevm_state_cancel(void);
> -uint64_t qemu_savevm_state_pending(QEMUFile *f, uint64_t max_size);
> +void qemu_savevm_state_pending(QEMUFile *f, uint64_t max_size,
> + uint64_t *res_non_postcopiable,
> + uint64_t *res_postcopiable);
> void qemu_savevm_command_send(QEMUFile *f, enum qemu_vm_cmd command,
> uint16_t len, uint8_t *data);
> void qemu_savevm_send_ping(QEMUFile *f, uint32_t value);
> diff --git a/migration/block.c b/migration/block.c
> index 0c76106..0f6f209 100644
> --- a/migration/block.c
> +++ b/migration/block.c
> @@ -754,7 +754,9 @@ static int block_save_complete(QEMUFile *f, void *opaque)
> return 0;
> }
>
> -static uint64_t block_save_pending(QEMUFile *f, void *opaque, uint64_t
> max_size)
> +static void block_save_pending(QEMUFile *f, void *opaque, uint64_t max_size,
> + uint64_t *non_postcopiable_pending,
> + uint64_t *postcopiable_pending)
> {
> /* Estimate pending number of bytes to send */
> uint64_t pending;
> @@ -773,7 +775,8 @@ static uint64_t block_save_pending(QEMUFile *f, void
> *opaque, uint64_t max_size)
> qemu_mutex_unlock_iothread();
>
> DPRINTF("Enter save live pending %" PRIu64 "\n", pending);
> - return pending;
> + *non_postcopiable_pending = pending;
> + *postcopiable_pending = 0;
> }
>
> static int block_load(QEMUFile *f, void *opaque, int version_id)
> diff --git a/migration/migration.c b/migration/migration.c
> index 2e6adca..a4fc7d7 100644
> --- a/migration/migration.c
> +++ b/migration/migration.c
> @@ -868,8 +868,13 @@ static void *migration_thread(void *opaque)
> uint64_t pending_size;
>
> if (!qemu_file_rate_limit(s->file)) {
> - pending_size = qemu_savevm_state_pending(s->file, max_size);
> - trace_migrate_pending(pending_size, max_size);
> + uint64_t pend_post, pend_nonpost;
> +
> + qemu_savevm_state_pending(s->file, max_size, &pend_nonpost,
> + &pend_post);
> + pending_size = pend_nonpost + pend_post;
> + trace_migrate_pending(pending_size, max_size,
> + pend_post, pend_nonpost);
> if (pending_size && pending_size >= max_size) {
> qemu_savevm_state_iterate(s->file);
> } else {
> diff --git a/savevm.c b/savevm.c
> index df48ba8..e301a0a 100644
> --- a/savevm.c
> +++ b/savevm.c
> @@ -944,10 +944,20 @@ void qemu_savevm_state_complete(QEMUFile *f)
> qemu_fflush(f);
> }
>
> -uint64_t qemu_savevm_state_pending(QEMUFile *f, uint64_t max_size)
> +/* Give an estimate of the amount left to be transferred,
> + * the result is split into the amount for units that can and
> + * for units that can't do postcopy.
> + */
> +void qemu_savevm_state_pending(QEMUFile *f, uint64_t max_size,
> + uint64_t *res_non_postcopiable,
> + uint64_t *res_postcopiable)
> {
> SaveStateEntry *se;
> - uint64_t ret = 0;
> + uint64_t tmp_non_postcopiable, tmp_postcopiable;
> +
> + *res_non_postcopiable = 0;
> + *res_postcopiable = 0;
> +
>
> QTAILQ_FOREACH(se, &savevm_handlers, entry) {
> if (!se->ops || !se->ops->save_live_pending) {
> @@ -958,9 +968,12 @@ uint64_t qemu_savevm_state_pending(QEMUFile *f, uint64_t
> max_size)
> continue;
> }
> }
> - ret += se->ops->save_live_pending(f, se->opaque, max_size);
> + se->ops->save_live_pending(f, se->opaque, max_size,
> + &tmp_non_postcopiable, &tmp_postcopiable);
> +
> + *res_postcopiable += tmp_postcopiable;
> + *res_non_postcopiable += tmp_non_postcopiable;
> }
> - return ret;
> }
>
> void qemu_savevm_state_cancel(void)
> diff --git a/trace-events b/trace-events
> index cbf995c..83312b6 100644
> --- a/trace-events
> +++ b/trace-events
> @@ -1400,7 +1400,7 @@ migrate_fd_cleanup(void) ""
> migrate_fd_cleanup_src_rp(void) ""
> migrate_fd_error(void) ""
> migrate_fd_cancel(void) ""
> -migrate_pending(uint64_t size, uint64_t max) "pending size %" PRIu64 " max
> %" PRIu64
> +migrate_pending(uint64_t size, uint64_t max, uint64_t post, uint64_t
> nonpost) "pending size %" PRIu64 " max %" PRIu64 " (post=%" PRIu64 "
> nonpost=%" PRIu64 ")"
> migrate_send_rp_message(int cmd, uint16_t len) "cmd=%d, len=%d"
> open_outgoing_return_path(void) ""
> open_outgoing_return_path_continue(void) ""
--
David Gibson | I'll have my music baroque, and my code
david AT gibson.dropbear.id.au | minimalist, thank you. NOT _the_ _other_
| _way_ _around_!
http://www.ozlabs.org/~dgibson
pgpwsIlFMClyr.pgp
Description: PGP signature
- Re: [Qemu-devel] [PATCH v5 20/45] Modify savevm handlers for postcopy,
David Gibson <=
- Re: [Qemu-devel] [PATCH v5 20/45] Modify savevm handlers for postcopy, Dr. David Alan Gilbert, 2015/03/13
- Re: [Qemu-devel] [PATCH v5 20/45] Modify savevm handlers for postcopy, David Gibson, 2015/03/16
- Re: [Qemu-devel] [PATCH v5 20/45] Modify savevm handlers for postcopy, Dr. David Alan Gilbert, 2015/03/20
- Re: [Qemu-devel] [PATCH v5 20/45] Modify savevm handlers for postcopy, David Gibson, 2015/03/22
- Re: [Qemu-devel] [PATCH v5 20/45] Modify savevm handlers for postcopy, Dr. David Alan Gilbert, 2015/03/24
- Re: [Qemu-devel] [PATCH v5 20/45] Modify savevm handlers for postcopy, David Gibson, 2015/03/24
- Re: [Qemu-devel] [PATCH v5 20/45] Modify savevm handlers for postcopy, Dr. David Alan Gilbert, 2015/03/25
- Re: [Qemu-devel] [PATCH v5 20/45] Modify savevm handlers for postcopy, Dr. David Alan Gilbert, 2015/03/25
- Re: [Qemu-devel] [PATCH v5 20/45] Modify savevm handlers for postcopy, David Gibson, 2015/03/25
- Re: [Qemu-devel] [PATCH v5 20/45] Modify savevm handlers for postcopy, Dr. David Alan Gilbert, 2015/03/26