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migration/multifd: Implement zero page transmission on the multifd thread.

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1. Add zero_pages field in MultiFDPacket_t.
2. Implements the zero page detection and handling on the multifd
threads for non-compression, zlib and zstd compression backends.
3. Added a new value 'multifd' in ZeroPageDetection enumeration.
4. Adds zero page counters and updates multifd send/receive tracing
format to track the newly added counters.

Signed-off-by: Hao Xiang <hao.xiang@bytedance.com>
Acked-by: Markus Armbruster <armbru@redhat.com>
Reviewed-by: Fabiano Rosas <farosas@suse.de>
Link: https://lore.kernel.org/r/20240311180015.3359271-5-hao.xiang@linux.dev
Signed-off-by: Peter Xu <peterx@redhat.com>
This commit is contained in:
Hao Xiang 2024-03-11 18:00:12 +00:00 • committed by Peter Xu
parent 5fdbb1dfcc
commit 303e6f54f9
10 changed files with 228 additions and 32 deletions
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23
migration/multifd.h
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@ -55,14 +55,24 @@ typedef struct {
/* size of the next packet that contains pages */
uint32_t next_packet_size;
uint64_t packet_num;
uint64_t unused[4]; /* Reserved for future use */
/* zero pages */
uint32_t zero_pages;
uint32_t unused32[1]; /* Reserved for future use */
uint64_t unused64[3]; /* Reserved for future use */
char ramblock[256];
/*
* This array contains the pointers to:
* - normal pages (initial normal_pages entries)
* - zero pages (following zero_pages entries)
*/
uint64_t offset[];
} __attribute__((packed)) MultiFDPacket_t;
typedef struct {
/* number of used pages */
uint32_t num;
/* number of normal pages */
uint32_t normal_num;
/* number of allocated pages */
uint32_t allocated;
/* offset of each page */
@ -136,6 +146,8 @@ typedef struct {
uint64_t packets_sent;
/* non zero pages sent through this channel */
uint64_t total_normal_pages;
/* zero pages sent through this channel */
uint64_t total_zero_pages;
/* buffers to send */
struct iovec *iov;
/* number of iovs used */
@ -194,12 +206,18 @@ typedef struct {
uint8_t *host;
/* non zero pages recv through this channel */
uint64_t total_normal_pages;
/* zero pages recv through this channel */
uint64_t total_zero_pages;
/* buffers to recv */
struct iovec *iov;
/* Pages that are not zero */
ram_addr_t *normal;
/* num of non zero pages */
uint32_t normal_num;
/* Pages that are zero */
ram_addr_t *zero;
/* num of zero pages */
uint32_t zero_num;
/* used for de-compression methods */
void *compress_data;
} MultiFDRecvParams;
@ -221,6 +239,9 @@ typedef struct {
void multifd_register_ops(int method, MultiFDMethods *ops);
void multifd_send_fill_packet(MultiFDSendParams *p);
bool multifd_send_prepare_common(MultiFDSendParams *p);
void multifd_send_zero_page_detect(MultiFDSendParams *p);
void multifd_recv_zero_page_process(MultiFDRecvParams *p);
static inline void multifd_send_prepare_header(MultiFDSendParams *p)
{