From: "Dr. David Alan Gilbert (git)" <dgilbert@redhat.com>
To: qemu-devel@nongnu.org
Cc: aarcange@redhat.com, yamahata@private.email.ne.jp,
quintela@redhat.com, liang.z.li@intel.com, luis@cs.umu.se,
amit.shah@redhat.com, pbonzini@redhat.com,
david@gibson.dropbear.id.au
Subject: [Qemu-devel] [PATCH v7 20/42] Modify save_live_pending for postcopy
Date: Tue, 16 Jun 2015 11:26:33 +0100 [thread overview]
Message-ID: <1434450415-11339-21-git-send-email-dgilbert@redhat.com> (raw)
In-Reply-To: <1434450415-11339-1-git-send-email-dgilbert@redhat.com>
From: "Dr. David Alan Gilbert" <dgilbert@redhat.com>
Modify save_live_pending to return separate postcopiable and
non-postcopiable counts.
Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
---
include/migration/vmstate.h | 5 +++--
include/sysemu/sysemu.h | 4 +++-
migration/block.c | 7 +++++--
migration/migration.c | 9 +++++++--
migration/ram.c | 8 ++++++--
migration/savevm.c | 21 +++++++++++++++++----
trace-events | 2 +-
7 files changed, 42 insertions(+), 14 deletions(-)
diff --git a/include/migration/vmstate.h b/include/migration/vmstate.h
index 074747c..7257196 100644
--- a/include/migration/vmstate.h
+++ b/include/migration/vmstate.h
@@ -54,8 +54,9 @@ 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);
-
+ void (*save_live_pending)(QEMUFile *f, void *opaque, uint64_t max_size,
+ uint64_t *non_postcopiable_pending,
+ uint64_t *postcopiable_pending);
LoadStateHandler *load_state;
} SaveVMHandlers;
diff --git a/include/sysemu/sysemu.h b/include/sysemu/sysemu.h
index 5bf8f80..ff6bb2c 100644
--- a/include/sysemu/sysemu.h
+++ b/include/sysemu/sysemu.h
@@ -110,7 +110,9 @@ void qemu_savevm_state_header(QEMUFile *f);
int qemu_savevm_state_iterate(QEMUFile *f);
void qemu_savevm_state_complete_precopy(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 3005668..4483ce3 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 34cd9a6..e77b8b4 100644
--- a/migration/migration.c
+++ b/migration/migration.c
@@ -1024,8 +1024,13 @@ 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/migration/ram.c b/migration/ram.c
index 492ed8a..fb24954 100644
--- a/migration/ram.c
+++ b/migration/ram.c
@@ -1273,7 +1273,9 @@ 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;
@@ -1287,7 +1289,9 @@ 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)
diff --git a/migration/savevm.c b/migration/savevm.c
index 2c4cbe1..ebd3d31 100644
--- a/migration/savevm.c
+++ b/migration/savevm.c
@@ -1012,10 +1012,20 @@ void qemu_savevm_state_complete_precopy(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_state.handlers, entry) {
if (!se->ops || !se->ops->save_live_pending) {
@@ -1026,9 +1036,12 @@ 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 299805b..339eb71 100644
--- a/trace-events
+++ b/trace-events
@@ -1419,7 +1419,7 @@ 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 msg_type, uint16_t len) "%d: len %d"
open_return_path_on_source(void) ""
open_return_path_on_source_continue(void) ""
--
2.4.3
next prev parent reply other threads:[~2015-06-16 10:27 UTC|newest]
Thread overview: 209+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-06-16 10:26 [Qemu-devel] [PATCH v7 00/42] Postcopy implementation Dr. David Alan Gilbert (git)
2015-06-16 10:26 ` [Qemu-devel] [PATCH v7 01/42] Start documenting how postcopy works Dr. David Alan Gilbert (git)
2015-06-17 11:42 ` Juan Quintela
2015-06-17 12:30 ` Dr. David Alan Gilbert
2015-06-18 7:50 ` Li, Liang Z
2015-06-18 8:10 ` Dr. David Alan Gilbert
2015-06-18 8:28 ` Paolo Bonzini
2015-06-19 17:52 ` Dr. David Alan Gilbert
2015-06-26 6:46 ` Yang Hongyang
2015-06-26 7:53 ` zhanghailiang
2015-06-26 8:00 ` Yang Hongyang
2015-06-26 8:10 ` Dr. David Alan Gilbert
2015-06-26 8:19 ` Yang Hongyang
2015-08-04 5:20 ` Amit Shah
2015-08-05 12:21 ` Dr. David Alan Gilbert
2015-06-16 10:26 ` [Qemu-devel] [PATCH v7 02/42] Provide runtime Target page information Dr. David Alan Gilbert (git)
2015-06-17 11:43 ` Juan Quintela
2015-06-16 10:26 ` [Qemu-devel] [PATCH v7 03/42] Init page sizes in qtest Dr. David Alan Gilbert (git)
2015-06-17 11:49 ` Juan Quintela
2015-07-06 6:14 ` Amit Shah
2015-08-04 5:23 ` Amit Shah
2015-06-16 10:26 ` [Qemu-devel] [PATCH v7 04/42] qemu_ram_block_from_host Dr. David Alan Gilbert (git)
2015-06-17 11:54 ` Juan Quintela
2015-07-10 8:36 ` Amit Shah
2015-06-16 10:26 ` [Qemu-devel] [PATCH v7 05/42] Add qemu_get_buffer_less_copy to avoid copies some of the time Dr. David Alan Gilbert (git)
2015-06-17 11:57 ` Juan Quintela
2015-06-17 12:33 ` Dr. David Alan Gilbert
2015-07-13 9:08 ` Amit Shah
2015-06-16 10:26 ` [Qemu-devel] [PATCH v7 06/42] Add wrapper for setting blocking status on a QEMUFile Dr. David Alan Gilbert (git)
2015-06-17 11:59 ` Juan Quintela
2015-06-17 12:34 ` Dr. David Alan Gilbert
2015-06-17 12:57 ` Juan Quintela
2015-06-16 10:26 ` [Qemu-devel] [PATCH v7 07/42] ram_debug_dump_bitmap: Dump a migration bitmap as text Dr. David Alan Gilbert (git)
2015-06-17 12:17 ` Juan Quintela
2015-06-19 17:04 ` Dr. David Alan Gilbert
2015-07-13 10:15 ` Juan Quintela
2015-07-13 9:12 ` Amit Shah
2015-06-16 10:26 ` [Qemu-devel] [PATCH v7 08/42] migrate_init: Call from savevm Dr. David Alan Gilbert (git)
2015-06-17 12:18 ` Juan Quintela
2015-07-13 9:13 ` Amit Shah
2015-06-16 10:26 ` [Qemu-devel] [PATCH v7 09/42] Rename save_live_complete to save_live_complete_precopy Dr. David Alan Gilbert (git)
2015-06-17 12:20 ` Juan Quintela
2015-06-16 10:26 ` [Qemu-devel] [PATCH v7 10/42] Return path: Open a return path on QEMUFile for sockets Dr. David Alan Gilbert (git)
2015-06-17 12:23 ` Juan Quintela
2015-06-17 17:07 ` Dr. David Alan Gilbert
2015-07-13 10:12 ` Amit Shah
2015-06-16 10:26 ` [Qemu-devel] [PATCH v7 11/42] Return path: socket_writev_buffer: Block even on non-blocking fd's Dr. David Alan Gilbert (git)
2015-06-17 12:28 ` Juan Quintela
2015-06-19 17:18 ` Dr. David Alan Gilbert
2015-07-13 12:37 ` Amit Shah
2015-06-16 10:26 ` [Qemu-devel] [PATCH v7 12/42] Migration commands Dr. David Alan Gilbert (git)
2015-06-17 12:31 ` Juan Quintela
2015-06-19 17:38 ` Dr. David Alan Gilbert
2015-07-13 12:45 ` Amit Shah
2015-06-16 10:26 ` [Qemu-devel] [PATCH v7 13/42] Return path: Control commands Dr. David Alan Gilbert (git)
2015-06-17 12:49 ` Juan Quintela
2015-06-23 18:57 ` Dr. David Alan Gilbert
2015-07-13 12:55 ` Amit Shah
2015-06-16 10:26 ` [Qemu-devel] [PATCH v7 14/42] Return path: Send responses from destination to source Dr. David Alan Gilbert (git)
2015-06-17 16:30 ` Juan Quintela
2015-06-19 18:42 ` Dr. David Alan Gilbert
2015-07-01 9:29 ` Juan Quintela
2015-08-06 12:18 ` Dr. David Alan Gilbert
2015-07-15 7:31 ` Amit Shah
2015-06-16 10:26 ` [Qemu-devel] [PATCH v7 15/42] Return path: Source handling of return path Dr. David Alan Gilbert (git)
2015-07-13 10:29 ` Juan Quintela
2015-08-18 10:23 ` Dr. David Alan Gilbert
2015-07-15 7:50 ` Amit Shah
2015-07-16 11:32 ` Dr. David Alan Gilbert
2015-08-05 8:06 ` zhanghailiang
2015-08-18 10:45 ` Dr. David Alan Gilbert
2015-08-18 11:29 ` zhanghailiang
2015-06-16 10:26 ` [Qemu-devel] [PATCH v7 16/42] Rework loadvm path for subloops Dr. David Alan Gilbert (git)
2015-07-13 10:33 ` Juan Quintela
2015-07-15 9:34 ` Amit Shah
2015-06-16 10:26 ` [Qemu-devel] [PATCH v7 17/42] Add migration-capability boolean for postcopy-ram Dr. David Alan Gilbert (git)
2015-06-16 15:43 ` Eric Blake
2015-06-16 15:58 ` Dr. David Alan Gilbert
2015-07-15 9:39 ` Amit Shah
2015-07-13 10:35 ` Juan Quintela
2015-07-15 9:40 ` Amit Shah
2015-06-16 10:26 ` [Qemu-devel] [PATCH v7 18/42] Add wrappers and handlers for sending/receiving the postcopy-ram migration messages Dr. David Alan Gilbert (git)
2015-07-13 11:02 ` Juan Quintela
2015-07-20 10:13 ` Amit Shah
2015-08-26 14:48 ` Dr. David Alan Gilbert
2015-07-20 10:06 ` Amit Shah
2015-07-27 9:55 ` Dr. David Alan Gilbert
2015-06-16 10:26 ` [Qemu-devel] [PATCH v7 19/42] MIG_CMD_PACKAGED: Send a packaged chunk of migration stream Dr. David Alan Gilbert (git)
2015-07-13 11:07 ` Juan Quintela
2015-07-21 6:11 ` Amit Shah
2015-07-27 17:28 ` Dr. David Alan Gilbert
2015-08-04 5:27 ` Amit Shah
2015-06-16 10:26 ` Dr. David Alan Gilbert (git) [this message]
2015-07-13 11:12 ` [Qemu-devel] [PATCH v7 20/42] Modify save_live_pending for postcopy Juan Quintela
2015-07-31 16:13 ` Dr. David Alan Gilbert
2015-07-21 6:17 ` Amit Shah
2015-06-16 10:26 ` [Qemu-devel] [PATCH v7 21/42] postcopy: OS support test Dr. David Alan Gilbert (git)
2015-07-13 11:20 ` Juan Quintela
2015-07-13 16:31 ` Dr. David Alan Gilbert
2015-07-21 7:29 ` Amit Shah
2015-07-27 17:38 ` Dr. David Alan Gilbert
2015-08-04 5:28 ` Amit Shah
2015-06-16 10:26 ` [Qemu-devel] [PATCH v7 22/42] migrate_start_postcopy: Command to trigger transition to postcopy Dr. David Alan Gilbert (git)
2015-07-13 11:23 ` Juan Quintela
2015-07-13 17:13 ` Dr. David Alan Gilbert
2015-07-13 18:07 ` Juan Quintela
2015-07-21 7:40 ` Amit Shah
2015-09-24 9:59 ` Dr. David Alan Gilbert
2015-09-24 14:20 ` Dr. David Alan Gilbert
2015-06-16 10:26 ` [Qemu-devel] [PATCH v7 23/42] MIGRATION_STATUS_POSTCOPY_ACTIVE: Add new migration state Dr. David Alan Gilbert (git)
2015-07-13 11:27 ` Juan Quintela
2015-07-13 15:53 ` Dr. David Alan Gilbert
2015-07-13 16:26 ` Juan Quintela
2015-07-13 16:48 ` Dr. David Alan Gilbert
2015-07-13 18:05 ` Juan Quintela
2015-07-21 10:33 ` Amit Shah
2015-09-23 17:04 ` Dr. David Alan Gilbert
2015-06-16 10:26 ` [Qemu-devel] [PATCH v7 24/42] Add qemu_savevm_state_complete_postcopy Dr. David Alan Gilbert (git)
2015-07-13 11:35 ` Juan Quintela
2015-07-13 15:33 ` Dr. David Alan Gilbert
2015-07-21 10:42 ` Amit Shah
2015-07-27 17:58 ` Dr. David Alan Gilbert
2015-06-16 10:26 ` [Qemu-devel] [PATCH v7 25/42] Postcopy: Maintain sentmap and calculate discard Dr. David Alan Gilbert (git)
2015-07-13 11:47 ` Juan Quintela
2015-09-15 17:01 ` Dr. David Alan Gilbert
2015-07-21 11:36 ` Amit Shah
2015-07-31 16:51 ` Dr. David Alan Gilbert
2015-06-16 10:26 ` [Qemu-devel] [PATCH v7 26/42] postcopy: Incoming initialisation Dr. David Alan Gilbert (git)
2015-07-13 12:04 ` Juan Quintela
2015-09-23 19:06 ` Dr. David Alan Gilbert
2015-07-22 6:19 ` Amit Shah
2015-06-16 10:26 ` [Qemu-devel] [PATCH v7 27/42] postcopy: ram_enable_notify to switch on userfault Dr. David Alan Gilbert (git)
2015-07-13 12:10 ` Juan Quintela
2015-07-13 17:36 ` Dr. David Alan Gilbert
2015-07-23 5:22 ` Amit Shah
2015-06-16 10:26 ` [Qemu-devel] [PATCH v7 28/42] Postcopy: Postcopy startup in migration thread Dr. David Alan Gilbert (git)
2015-07-13 12:56 ` Juan Quintela
2015-07-13 17:56 ` Dr. David Alan Gilbert
2015-07-13 18:09 ` Juan Quintela
2015-09-23 17:56 ` Dr. David Alan Gilbert
2015-07-23 5:53 ` Amit Shah
2015-07-23 5:55 ` Amit Shah
2015-06-16 10:26 ` [Qemu-devel] [PATCH v7 29/42] Postcopy end in migration_thread Dr. David Alan Gilbert (git)
2015-07-13 13:15 ` Juan Quintela
2015-07-23 6:41 ` Amit Shah
2015-08-04 11:31 ` Dr. David Alan Gilbert
2015-07-23 6:41 ` Amit Shah
2015-06-16 10:26 ` [Qemu-devel] [PATCH v7 30/42] Page request: Add MIG_RP_MSG_REQ_PAGES reverse command Dr. David Alan Gilbert (git)
2015-07-13 13:24 ` Juan Quintela
2015-08-06 14:15 ` Dr. David Alan Gilbert
2015-07-23 6:50 ` Amit Shah
2015-08-06 14:21 ` Dr. David Alan Gilbert
2015-06-16 10:26 ` [Qemu-devel] [PATCH v7 31/42] Page request: Process incoming page request Dr. David Alan Gilbert (git)
2015-07-14 9:18 ` Juan Quintela
2015-08-06 10:45 ` Dr. David Alan Gilbert
2015-10-20 10:29 ` Juan Quintela
2015-07-23 12:23 ` Amit Shah
2015-06-16 10:26 ` [Qemu-devel] [PATCH v7 32/42] Page request: Consume pages off the post-copy queue Dr. David Alan Gilbert (git)
2015-07-14 9:40 ` Juan Quintela
2015-09-16 18:36 ` Dr. David Alan Gilbert
2015-07-27 6:05 ` Amit Shah
2015-09-16 18:48 ` Dr. David Alan Gilbert
2015-06-16 10:26 ` [Qemu-devel] [PATCH v7 33/42] postcopy_ram.c: place_page and helpers Dr. David Alan Gilbert (git)
2015-07-14 10:05 ` Juan Quintela
2015-07-27 6:11 ` Amit Shah
2015-09-23 16:45 ` Dr. David Alan Gilbert
2015-07-27 6:11 ` Amit Shah
2015-06-16 10:26 ` [Qemu-devel] [PATCH v7 34/42] Postcopy: Use helpers to map pages during migration Dr. David Alan Gilbert (git)
2015-07-14 12:34 ` Juan Quintela
2015-07-17 17:31 ` Dr. David Alan Gilbert
2015-07-27 7:39 ` Amit Shah
2015-08-06 11:22 ` Dr. David Alan Gilbert
2015-06-16 10:26 ` [Qemu-devel] [PATCH v7 35/42] Don't sync dirty bitmaps in postcopy Dr. David Alan Gilbert (git)
2015-07-14 12:36 ` Juan Quintela
2015-07-14 13:13 ` Dr. David Alan Gilbert
2015-07-27 7:43 ` Amit Shah
2015-07-31 9:50 ` Dr. David Alan Gilbert
2015-08-04 5:46 ` Amit Shah
2015-06-16 10:26 ` [Qemu-devel] [PATCH v7 36/42] Host page!=target page: Cleanup bitmaps Dr. David Alan Gilbert (git)
2015-07-14 15:01 ` Juan Quintela
2015-07-31 15:53 ` Dr. David Alan Gilbert
2015-06-16 10:26 ` [Qemu-devel] [PATCH v7 37/42] Postcopy; Handle userfault requests Dr. David Alan Gilbert (git)
2015-07-14 15:10 ` Juan Quintela
2015-07-14 15:15 ` Dr. David Alan Gilbert
2015-07-14 15:25 ` Juan Quintela
2015-07-27 14:29 ` Amit Shah
2015-06-16 10:26 ` [Qemu-devel] [PATCH v7 38/42] Start up a postcopy/listener thread ready for incoming page data Dr. David Alan Gilbert (git)
2015-07-14 15:12 ` Juan Quintela
2015-06-16 10:26 ` [Qemu-devel] [PATCH v7 39/42] postcopy: Wire up loadvm_postcopy_handle_ commands Dr. David Alan Gilbert (git)
2015-07-14 15:14 ` Juan Quintela
2015-07-28 5:53 ` Amit Shah
2015-06-16 10:26 ` [Qemu-devel] [PATCH v7 40/42] End of migration for postcopy Dr. David Alan Gilbert (git)
2015-07-14 15:15 ` Juan Quintela
2015-07-28 5:55 ` Amit Shah
2015-06-16 10:26 ` [Qemu-devel] [PATCH v7 41/42] Disable mlock around incoming postcopy Dr. David Alan Gilbert (git)
2015-07-14 15:22 ` Juan Quintela
2015-07-28 6:02 ` Amit Shah
2015-07-28 11:32 ` Juan Quintela
2015-08-06 14:55 ` Dr. David Alan Gilbert
2015-08-07 3:05 ` zhanghailiang
2015-09-24 10:36 ` Dr. David Alan Gilbert
2015-07-28 6:02 ` Amit Shah
2015-06-16 10:26 ` [Qemu-devel] [PATCH v7 42/42] Inhibit ballooning during postcopy Dr. David Alan Gilbert (git)
2015-07-14 15:24 ` Juan Quintela
2015-07-28 6:15 ` Amit Shah
2015-07-28 9:08 ` Dr. David Alan Gilbert
2015-07-28 10:01 ` Amit Shah
2015-07-28 11:16 ` Dr. David Alan Gilbert
2015-07-28 6:21 ` [Qemu-devel] [PATCH v7 00/42] Postcopy implementation Amit Shah
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