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Re: [Qemu-devel] [PATCH] ram: Rename RAM_SAVE_FLAG_COMPRESS to RAM_SAVE_
From: |
Peter Xu |
Subject: |
Re: [Qemu-devel] [PATCH] ram: Rename RAM_SAVE_FLAG_COMPRESS to RAM_SAVE_FLAG_ZERO |
Date: |
Fri, 12 May 2017 11:04:11 +0800 |
User-agent: |
Mutt/1.5.24 (2015-08-30) |
On Thu, May 11, 2017 at 05:50:28PM +0200, Juan Quintela wrote:
> Reflects better what it does now, and avoid confussions with
> RAM_SAVE_FLAG_COMPRESS_PAGE.
>
> Signed-off-by: Juan Quintela <address@hidden>
Reviewed-by: Peter Xu <address@hidden>
>
> ---
>
> Hi
>
> I always forgot the diffe9rent between COMPRESS and COMPRESS_PAGE.
> This patch makes it clean which is which.
>
> Please, comment.
>
> Later, Juan.
>
>
> ---
> migration/ram.c | 18 ++++++++++++------
> 1 file changed, 12 insertions(+), 6 deletions(-)
>
> diff --git a/migration/ram.c b/migration/ram.c
> index 995d1fc..76c118c 100644
> --- a/migration/ram.c
> +++ b/migration/ram.c
> @@ -48,8 +48,14 @@
> /***********************************************************/
> /* ram save/restore */
>
> +/* RAM_SAVE_FLAG_ZERO used to be named RAM_SAVE_FLAG_COMPRESS, it
> + * worked for pages that where filled with the same char. We switched
> + * it to only search for the zero value. And to avoid confusion with
> + * RAM_SSAVE_FLAG_COMPRESS_PAGE just rename it.
> + */
> +
> #define RAM_SAVE_FLAG_FULL 0x01 /* Obsolete, not used anymore */
> -#define RAM_SAVE_FLAG_COMPRESS 0x02
> +#define RAM_SAVE_FLAG_ZERO 0x02
> #define RAM_SAVE_FLAG_MEM_SIZE 0x04
> #define RAM_SAVE_FLAG_PAGE 0x08
> #define RAM_SAVE_FLAG_EOS 0x10
> @@ -746,7 +752,7 @@ static int save_zero_page(RAMState *rs, RAMBlock *block,
> ram_addr_t offset,
> if (is_zero_range(p, TARGET_PAGE_SIZE)) {
> rs->zero_pages++;
> rs->bytes_transferred +=
> - save_page_header(rs, rs->f, block, offset |
> RAM_SAVE_FLAG_COMPRESS);
> + save_page_header(rs, rs->f, block, offset | RAM_SAVE_FLAG_ZERO);
> qemu_put_byte(rs->f, 0);
> rs->bytes_transferred += 1;
> pages = 1;
> @@ -2406,7 +2412,7 @@ static int ram_load_postcopy(QEMUFile *f)
>
> trace_ram_load_postcopy_loop((uint64_t)addr, flags);
> place_needed = false;
> - if (flags & (RAM_SAVE_FLAG_COMPRESS | RAM_SAVE_FLAG_PAGE)) {
> + if (flags & (RAM_SAVE_FLAG_ZERO | RAM_SAVE_FLAG_PAGE)) {
> block = ram_block_from_stream(f, flags);
>
> host = host_from_ram_block_offset(block, addr);
> @@ -2453,7 +2459,7 @@ static int ram_load_postcopy(QEMUFile *f)
> last_host = host;
>
> switch (flags & ~RAM_SAVE_FLAG_CONTINUE) {
> - case RAM_SAVE_FLAG_COMPRESS:
> + case RAM_SAVE_FLAG_ZERO:
> ch = qemu_get_byte(f);
> memset(page_buffer, ch, TARGET_PAGE_SIZE);
> if (ch) {
> @@ -2542,7 +2548,7 @@ static int ram_load(QEMUFile *f, void *opaque, int
> version_id)
> flags = addr & ~TARGET_PAGE_MASK;
> addr &= TARGET_PAGE_MASK;
>
> - if (flags & (RAM_SAVE_FLAG_COMPRESS | RAM_SAVE_FLAG_PAGE |
> + if (flags & (RAM_SAVE_FLAG_ZERO | RAM_SAVE_FLAG_PAGE |
> RAM_SAVE_FLAG_COMPRESS_PAGE | RAM_SAVE_FLAG_XBZRLE)) {
> RAMBlock *block = ram_block_from_stream(f, flags);
>
> @@ -2604,7 +2610,7 @@ static int ram_load(QEMUFile *f, void *opaque, int
> version_id)
> }
> break;
>
> - case RAM_SAVE_FLAG_COMPRESS:
> + case RAM_SAVE_FLAG_ZERO:
> ch = qemu_get_byte(f);
> ram_handle_compressed(host, ch, TARGET_PAGE_SIZE);
> break;
> --
> 2.9.3
>
--
Peter Xu