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migration: Add the framework of multi-thread decompression

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Add the code to create and destroy the multiple threads those will be
used to do data decompression. Left some functions empty just to keep
clearness, and the code will be added later.

Signed-off-by: Liang Li <liang.z.li@intel.com>
Signed-off-by: Yang Zhang <yang.z.zhang@intel.com>
Reviewed-by: Dr.David Alan Gilbert <dgilbert@redhat.com>
Reviewed-by: Juan Quintela <quintela@redhat.com>
Signed-off-by: Juan Quintela <quintela@redhat.com>
This commit is contained in:
Liang Li 2015-03-23 16:32:18 +08:00 committed by Juan Quintela
parent 8706d2d566
commit 3fcb38c223
3 changed files with 100 additions and 0 deletions
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77
arch_init.c
View file

@ -24,6 +24,7 @@
#include <stdint.h>
#include <stdarg.h>
#include <stdlib.h>
#include <zlib.h>
#ifndef _WIN32
#include <sys/types.h>
#include <sys/mman.h>
@ -127,6 +128,7 @@ static uint64_t bitmap_sync_count;
#define RAM_SAVE_FLAG_CONTINUE 0x20
#define RAM_SAVE_FLAG_XBZRLE 0x40
/* 0x80 is reserved in migration.h start with 0x100 next */
#define RAM_SAVE_FLAG_COMPRESS_PAGE 0x100
static struct defconfig_file {
const char *filename;
@ -321,9 +323,18 @@ struct CompressParam {
};
typedef struct CompressParam CompressParam;
struct DecompressParam {
/* To be done */
};
typedef struct DecompressParam DecompressParam;
static CompressParam *comp_param;
static QemuThread *compress_threads;
static bool quit_comp_thread;
static bool quit_decomp_thread;
static DecompressParam *decomp_param;
static QemuThread *decompress_threads;
static uint8_t *compressed_data_buf;
static void *do_data_compress(void *opaque)
{
@ -1203,10 +1214,59 @@ void ram_handle_compressed(void *host, uint8_t ch, uint64_t size)
}
}
static void *do_data_decompress(void *opaque)
{
while (!quit_decomp_thread) {
/* To be done */
}
return NULL;
}
void migrate_decompress_threads_create(void)
{
int i, thread_count;
thread_count = migrate_decompress_threads();
decompress_threads = g_new0(QemuThread, thread_count);
decomp_param = g_new0(DecompressParam, thread_count);
compressed_data_buf = g_malloc0(compressBound(TARGET_PAGE_SIZE));
quit_decomp_thread = false;
for (i = 0; i < thread_count; i++) {
qemu_thread_create(decompress_threads + i, "decompress",
do_data_decompress, decomp_param + i,
QEMU_THREAD_JOINABLE);
}
}
void migrate_decompress_threads_join(void)
{
int i, thread_count;
quit_decomp_thread = true;
thread_count = migrate_decompress_threads();
for (i = 0; i < thread_count; i++) {
qemu_thread_join(decompress_threads + i);
}
g_free(decompress_threads);
g_free(decomp_param);
g_free(compressed_data_buf);
decompress_threads = NULL;
decomp_param = NULL;
compressed_data_buf = NULL;
}
static void decompress_data_with_multi_threads(uint8_t *compbuf,
void *host, int len)
{
/* To be done */
}
static int ram_load(QEMUFile *f, void *opaque, int version_id)
{
int flags = 0, ret = 0;
static uint64_t seq_iter;
int len = 0;
seq_iter++;
@ -1286,6 +1346,23 @@ static int ram_load(QEMUFile *f, void *opaque, int version_id)
}
qemu_get_buffer(f, host, TARGET_PAGE_SIZE);
break;
case RAM_SAVE_FLAG_COMPRESS_PAGE:
host = host_from_stream_offset(f, addr, flags);
if (!host) {
error_report("Invalid RAM offset " RAM_ADDR_FMT, addr);
ret = -EINVAL;
break;
}
len = qemu_get_be32(f);
if (len < 0 || len > compressBound(TARGET_PAGE_SIZE)) {
error_report("Invalid compressed data length: %d", len);
ret = -EINVAL;
break;
}
qemu_get_buffer(f, compressed_data_buf, len);
decompress_data_with_multi_threads(compressed_data_buf, host, len);
break;
case RAM_SAVE_FLAG_XBZRLE:
host = host_from_stream_offset(f, addr, flags);
if (!host) {

4
include/migration/migration.h
View file

@ -51,6 +51,7 @@ struct MigrationState
QEMUBH *cleanup_bh;
QEMUFile *file;
int compress_thread_count;
int decompress_thread_count;
int compress_level;
int state;
@ -108,6 +109,8 @@ MigrationState *migrate_get_current(void);
void migrate_compress_threads_create(void);
void migrate_compress_threads_join(void);
void migrate_decompress_threads_create(void);
void migrate_decompress_threads_join(void);
uint64_t ram_bytes_remaining(void);
uint64_t ram_bytes_transferred(void);
uint64_t ram_bytes_total(void);
@ -159,6 +162,7 @@ int64_t xbzrle_cache_resize(int64_t new_size);
bool migrate_use_compression(void);
int migrate_compress_level(void);
int migrate_compress_threads(void);
int migrate_decompress_threads(void);
void ram_control_before_iterate(QEMUFile *f, uint64_t flags);
void ram_control_after_iterate(QEMUFile *f, uint64_t flags);

19
migration/migration.c
View file

@ -35,6 +35,9 @@
/* Default compression thread count */
#define DEFAULT_MIGRATE_COMPRESS_THREAD_COUNT 8
/* Default decompression thread count, usually decompression is at
* least 4 times as fast as compression.*/
#define DEFAULT_MIGRATE_DECOMPRESS_THREAD_COUNT 2
/*0: means nocompress, 1: best speed, ... 9: best compress ratio */
#define DEFAULT_MIGRATE_COMPRESS_LEVEL 1
@ -58,6 +61,7 @@ MigrationState *migrate_get_current(void)
.xbzrle_cache_size = DEFAULT_MIGRATE_CACHE_SIZE,
.mbps = -1,
.compress_thread_count = DEFAULT_MIGRATE_COMPRESS_THREAD_COUNT,
.decompress_thread_count = DEFAULT_MIGRATE_DECOMPRESS_THREAD_COUNT,
.compress_level = DEFAULT_MIGRATE_COMPRESS_LEVEL,
};
@ -113,6 +117,7 @@ static void process_incoming_migration_co(void *opaque)
free_xbzrle_decoded_buf();
if (ret < 0) {
error_report("load of migration failed: %s", strerror(-ret));
migrate_decompress_threads_join();
exit(EXIT_FAILURE);
}
qemu_announce_self();
@ -121,6 +126,7 @@ static void process_incoming_migration_co(void *opaque)
bdrv_invalidate_cache_all(&local_err);
if (local_err) {
error_report_err(local_err);
migrate_decompress_threads_join();
exit(EXIT_FAILURE);
}
@ -129,6 +135,7 @@ static void process_incoming_migration_co(void *opaque)
} else {
runstate_set(RUN_STATE_PAUSED);
}
migrate_decompress_threads_join();
}
void process_incoming_migration(QEMUFile *f)
@ -137,6 +144,7 @@ void process_incoming_migration(QEMUFile *f)
int fd = qemu_get_fd(f);
assert(fd != -1);
migrate_decompress_threads_create();
qemu_set_nonblock(fd);
qemu_coroutine_enter(co, f);
}
@ -400,6 +408,7 @@ static MigrationState *migrate_init(const MigrationParams *params)
int64_t xbzrle_cache_size = s->xbzrle_cache_size;
int compress_level = s->compress_level;
int compress_thread_count = s->compress_thread_count;
int decompress_thread_count = s->decompress_thread_count;
memcpy(enabled_capabilities, s->enabled_capabilities,
sizeof(enabled_capabilities));
@ -412,6 +421,7 @@ static MigrationState *migrate_init(const MigrationParams *params)
s->compress_level = compress_level;
s->compress_thread_count = compress_thread_count;
s->decompress_thread_count = decompress_thread_count;
s->bandwidth_limit = bandwidth_limit;
s->state = MIGRATION_STATUS_SETUP;
trace_migrate_set_state(MIGRATION_STATUS_SETUP);
@ -623,6 +633,15 @@ int migrate_compress_threads(void)
return s->compress_thread_count;
}
int migrate_decompress_threads(void)
{
MigrationState *s;
s = migrate_get_current();
return s->decompress_thread_count;
}
int migrate_use_xbzrle(void)
{
MigrationState *s;