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[Qemu-devel] [PATCH v4 7/8] migration: optimize xbzrle by reducing data
From: |
arei.gonglei |
Subject: |
[Qemu-devel] [PATCH v4 7/8] migration: optimize xbzrle by reducing data copy |
Date: |
Thu, 27 Mar 2014 11:18:22 +0800 |
From: ChenLiang <address@hidden>
Reducing data copy can reduce cpu overhead.
Signed-off-by: ChenLiang <address@hidden>
Signed-off-by: Gonglei <address@hidden>
Reviewed-by: Juan Quintela <address@hidden>
---
arch_init.c | 8 +++-----
1 file changed, 3 insertions(+), 5 deletions(-)
diff --git a/arch_init.c b/arch_init.c
index 84a4bd3..94b62e2 100644
--- a/arch_init.c
+++ b/arch_init.c
@@ -373,11 +373,8 @@ static int save_xbzrle_page(QEMUFile *f, uint8_t
**current_data,
prev_cached_page = get_cached_data(XBZRLE.cache, current_addr);
- /* save current buffer into memory */
- memcpy(XBZRLE.current_buf, *current_data, TARGET_PAGE_SIZE);
-
/* XBZRLE encoding (if there is no overflow) */
- encoded_len = xbzrle_encode_buffer(prev_cached_page, XBZRLE.current_buf,
+ encoded_len = xbzrle_encode_buffer(prev_cached_page, *current_data,
TARGET_PAGE_SIZE, XBZRLE.encoded_buf,
TARGET_PAGE_SIZE);
if (encoded_len == 0) {
@@ -396,7 +393,8 @@ static int save_xbzrle_page(QEMUFile *f, uint8_t
**current_data,
/* we need to update the data in the cache, in order to get the same data
*/
if (!last_stage) {
- memcpy(prev_cached_page, XBZRLE.current_buf, TARGET_PAGE_SIZE);
+ xbzrle_decode_buffer(XBZRLE.encoded_buf, encoded_len, prev_cached_page,
+ TARGET_PAGE_SIZE);
}
/* Send XBZRLE based compressed page */
--
1.7.12.4
- [Qemu-devel] [PATCH v4 0/8] migration: Optimizate the xbzrle and fix one corruption issue, arei.gonglei, 2014/03/26
- [Qemu-devel] [PATCH v4 7/8] migration: optimize xbzrle by reducing data copy,
arei.gonglei <=
- [Qemu-devel] [PATCH v4 2/8] migration: Add counts of updating the dirty bitmap, arei.gonglei, 2014/03/26
- [Qemu-devel] [PATCH v4 4/8] migration: expose xbzrle cache miss rate, arei.gonglei, 2014/03/26
- [Qemu-devel] [PATCH v4 8/8] migration: clear the dead code, arei.gonglei, 2014/03/26
- [Qemu-devel] [PATCH v4 6/8] XBZRLE: rebuild the cache_is_cached function, arei.gonglei, 2014/03/26
- [Qemu-devel] [PATCH v4 3/8] migration: expose the bitmap_sync_count to the end user, arei.gonglei, 2014/03/26
- [Qemu-devel] [PATCH v4 1/8] XBZRLE: Fix one XBZRLE corruption issues, arei.gonglei, 2014/03/26