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[Qemu-devel] [PATCH V7 08/17] ram/COLO: Record the dirty pages that SVM
From: |
Zhang Chen |
Subject: |
[Qemu-devel] [PATCH V7 08/17] ram/COLO: Record the dirty pages that SVM received |
Date: |
Mon, 14 May 2018 11:23:39 +0800 |
We record the address of the dirty pages that received,
it will help flushing pages that cached into SVM.
Here, it is a trick, we record dirty pages by re-using migration
dirty bitmap. In the later patch, we will start the dirty log
for SVM, just like migration, in this way, we can record both
the dirty pages caused by PVM and SVM, we only flush those dirty
pages from RAM cache while do checkpoint.
Signed-off-by: zhanghailiang <address@hidden>
Reviewed-by: Dr. David Alan Gilbert <address@hidden>
---
migration/ram.c | 33 +++++++++++++++++++++++++++++++++
1 file changed, 33 insertions(+)
diff --git a/migration/ram.c b/migration/ram.c
index 7ca845f..e35dfee 100644
--- a/migration/ram.c
+++ b/migration/ram.c
@@ -2531,6 +2531,15 @@ static inline void
*colo_cache_from_block_offset(RAMBlock *block,
__func__, block->idstr);
return NULL;
}
+
+ /*
+ * During colo checkpoint, we need bitmap of these migrated pages.
+ * It help us to decide which pages in ram cache should be flushed
+ * into VM's RAM later.
+ */
+ if (!test_and_set_bit(offset >> TARGET_PAGE_BITS, block->bmap)) {
+ ram_state->migration_dirty_pages++;
+ }
return block->colo_cache + offset;
}
@@ -2760,6 +2769,24 @@ int colo_init_ram_cache(void)
}
}
rcu_read_unlock();
+ /*
+ * Record the dirty pages that sent by PVM, we use this dirty bitmap
together
+ * with to decide which page in cache should be flushed into SVM's RAM. Here
+ * we use the same name 'ram_bitmap' as for migration.
+ */
+ if (ram_bytes_total()) {
+ RAMBlock *block;
+
+ QLIST_FOREACH_RCU(block, &ram_list.blocks, next) {
+ unsigned long pages = block->max_length >> TARGET_PAGE_BITS;
+
+ block->bmap = bitmap_new(pages);
+ bitmap_set(block->bmap, 0, pages);
+ }
+ }
+ ram_state = g_new0(RAMState, 1);
+ ram_state->migration_dirty_pages = 0;
+
return 0;
out_locked:
@@ -2779,6 +2806,10 @@ void colo_release_ram_cache(void)
{
RAMBlock *block;
+ QLIST_FOREACH_RCU(block, &ram_list.blocks, next) {
+ g_free(block->bmap);
+ block->bmap = NULL;
+ }
rcu_read_lock();
QLIST_FOREACH_RCU(block, &ram_list.blocks, next) {
if (block->colo_cache) {
@@ -2787,6 +2818,8 @@ void colo_release_ram_cache(void)
}
}
rcu_read_unlock();
+ g_free(ram_state);
+ ram_state = NULL;
}
/**
--
2.7.4
- [Qemu-devel] [PATCH V7 01/17] filter-rewriter: fix memory leak for connection in connection_track_table, (continued)
- [Qemu-devel] [PATCH V7 01/17] filter-rewriter: fix memory leak for connection in connection_track_table, Zhang Chen, 2018/05/14
- [Qemu-devel] [PATCH V7 09/17] COLO: Flush memory data from ram cache, Zhang Chen, 2018/05/14
- [Qemu-devel] [PATCH V7 03/17] colo-compare: use notifier to notify packets comparing result, Zhang Chen, 2018/05/14
- [Qemu-devel] [PATCH V7 07/17] COLO: Load dirty pages into SVM's RAM cache firstly, Zhang Chen, 2018/05/14
- [Qemu-devel] [PATCH V7 02/17] colo-compare: implement the process of checkpoint, Zhang Chen, 2018/05/14
- [Qemu-devel] [PATCH V7 14/17] filter: Add handle_event method for NetFilterClass, Zhang Chen, 2018/05/14
- [Qemu-devel] [PATCH V7 11/17] qapi: Add new command to query colo status, Zhang Chen, 2018/05/14
- [Qemu-devel] [PATCH V7 15/17] filter-rewriter: handle checkpoint and failover event, Zhang Chen, 2018/05/14
- [Qemu-devel] [PATCH V7 08/17] ram/COLO: Record the dirty pages that SVM received,
Zhang Chen <=
- [Qemu-devel] [PATCH V7 10/17] qmp event: Add COLO_EXIT event to notify users while exited COLO, Zhang Chen, 2018/05/14
[Qemu-devel] [PATCH V7 12/17] savevm: split the process of different stages for loadvm/savevm, Zhang Chen, 2018/05/14
[Qemu-devel] [PATCH V7 17/17] COLO: quick failover process by kick COLO thread, Zhang Chen, 2018/05/14
[Qemu-devel] [PATCH V7 04/17] COLO: integrate colo compare with colo frame, Zhang Chen, 2018/05/14
[Qemu-devel] [PATCH V7 16/17] COLO: notify net filters about checkpoint/failover event, Zhang Chen, 2018/05/14
Re: [Qemu-devel] [PATCH V7 00/17] COLO: integrate colo frame with block replication and COLO proxy, no-reply, 2018/05/14