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[Qemu-devel] [PATCH v3 1/3] migration: API to clear bits of guest free p
From: |
Wei Wang |
Subject: |
[Qemu-devel] [PATCH v3 1/3] migration: API to clear bits of guest free pages from the dirty bitmap |
Date: |
Fri, 2 Mar 2018 16:47:28 +0800 |
This patch adds an API to clear bits corresponding to guest free pages
from the dirty bitmap. Spilt the free page block if it crosses the QEMU
RAMBlock boundary.
Signed-off-by: Wei Wang <address@hidden>
CC: Dr. David Alan Gilbert <address@hidden>
CC: Juan Quintela <address@hidden>
CC: Michael S. Tsirkin <address@hidden>
---
include/migration/misc.h | 2 ++
migration/ram.c | 20 ++++++++++++++++++++
2 files changed, 22 insertions(+)
diff --git a/include/migration/misc.h b/include/migration/misc.h
index 77fd4f5..fae1acf 100644
--- a/include/migration/misc.h
+++ b/include/migration/misc.h
@@ -14,11 +14,13 @@
#ifndef MIGRATION_MISC_H
#define MIGRATION_MISC_H
+#include "exec/cpu-common.h"
#include "qemu/notify.h"
/* migration/ram.c */
void ram_mig_init(void);
+void qemu_guest_free_page_hint(void *addr, size_t len);
/* migration/block.c */
diff --git a/migration/ram.c b/migration/ram.c
index 5e33e5c..769a0f6 100644
--- a/migration/ram.c
+++ b/migration/ram.c
@@ -2189,6 +2189,26 @@ static int ram_init_all(RAMState **rsp)
return 0;
}
+void qemu_guest_free_page_hint(void *addr, size_t len)
+{
+ RAMBlock *block;
+ ram_addr_t offset;
+ size_t used_len, start, npages;
+
+ for (used_len = len; len > 0; len -= used_len) {
+ block = qemu_ram_block_from_host(addr, false, &offset);
+ if (unlikely(offset + len > block->used_length)) {
+ used_len = block->used_length - offset;
+ addr += used_len;
+ }
+
+ start = offset >> TARGET_PAGE_BITS;
+ npages = used_len >> TARGET_PAGE_BITS;
+ bitmap_clear(block->bmap, start, npages);
+ ram_state->migration_dirty_pages -= npages;
+ }
+}
+
/*
* Each of ram_save_setup, ram_save_iterate and ram_save_complete has
* long-running RCU critical section. When rcu-reclaims in the code
--
1.8.3.1
- [Qemu-devel] [PATCH v3 0/3] virtio-balloon: free page hint reporting support, Wei Wang, 2018/03/02
- [Qemu-devel] [PATCH v3 3/3] migration: use the free page hint feature from balloon, Wei Wang, 2018/03/02
- [Qemu-devel] [PATCH v3 1/3] migration: API to clear bits of guest free pages from the dirty bitmap,
Wei Wang <=
- [Qemu-devel] [PATCH v3 2/3] virtio-balloon: VIRTIO_BALLOON_F_FREE_PAGE_HINT, Wei Wang, 2018/03/02
- Re: [Qemu-devel] [PATCH v3 2/3] virtio-balloon: VIRTIO_BALLOON_F_FREE_PAGE_HINT, Michael S. Tsirkin, 2018/03/02
- Re: [Qemu-devel] [PATCH v3 2/3] virtio-balloon: VIRTIO_BALLOON_F_FREE_PAGE_HINT, Michael S. Tsirkin, 2018/03/02
- Re: [Qemu-devel] [PATCH v3 2/3] virtio-balloon: VIRTIO_BALLOON_F_FREE_PAGE_HINT, Wei Wang, 2018/03/04
- Re: [Qemu-devel] [PATCH v3 2/3] virtio-balloon: VIRTIO_BALLOON_F_FREE_PAGE_HINT, Michael S. Tsirkin, 2018/03/05
- Re: [Qemu-devel] [PATCH v3 2/3] virtio-balloon: VIRTIO_BALLOON_F_FREE_PAGE_HINT, Wei Wang, 2018/03/05
- Re: [Qemu-devel] [PATCH v3 2/3] virtio-balloon: VIRTIO_BALLOON_F_FREE_PAGE_HINT, Michael S. Tsirkin, 2018/03/05
- Re: [Qemu-devel] [PATCH v3 2/3] virtio-balloon: VIRTIO_BALLOON_F_FREE_PAGE_HINT, Wei Wang, 2018/03/07