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[PATCH 1/3] migration/ram: Modify the code comment of ram_save_host_page
[PATCH 1/3] migration/ram: Modify the code comment of ram_save_host_page()
Tue, 23 Feb 2021 10:16:43 +0800
The ram_save_host_page() has been modified several times
since its birth. But the comment hasn't been modified as it should
be. It'd better to modify the comment to explain ram_save_host_page()
Signed-off-by: Keqian Zhu <email@example.com>
Signed-off-by: Kunkun Jiang <firstname.lastname@example.org>
migration/ram.c | 17 +++++++++--------
1 file changed, 9 insertions(+), 8 deletions(-)
diff --git a/migration/ram.c b/migration/ram.c
index 72143da0ac..fc49c3f898 100644
@@ -1970,15 +1970,16 @@ static int ram_save_target_page(RAMState *rs,
- * ram_save_host_page: save a whole host page
+ * ram_save_host_page: save a whole host page or the rest of a block
- * Starting at *offset send pages up to the end of the current host
- * page. It's valid for the initial offset to point into the middle of
- * a host page in which case the remainder of the hostpage is sent.
- * Only dirty target pages are sent. Note that the host page size may
- * be a huge page for this block.
- * The saving stops at the boundary of the used_length of the block
- * if the RAMBlock isn't a multiple of the host page size.
+ * Starting at pss->page send pages up to the end of the current host
+ * page or the boundary of used_length of the block (if the RAMBlock
+ * isn't a multiple of the host page size). The min one is selected.
+ * Only dirty target pages are sent.
+ * Note that the host page size may be a huge page for this block, it's
+ * valid for the initial offset to point into the middle of a host page
+ * in which case the remainder of the hostpage is sent.
* Returns the number of pages written or negative on error