* [Qemu-devel] [PATCH v5 1/9] Add cache handling functions
2012-01-03 13:35 [Qemu-devel] [PATCH v5 0/9] XBZRLE delta for live migration of large memory apps Orit Wasserman
@ 2012-01-03 13:35 ` Orit Wasserman
2012-01-03 13:35 ` [Qemu-devel] [PATCH v5 2/9] Add rle_encode and rle_decode functions Implement Run Length Encoding compression Orit Wasserman
` (7 subsequent siblings)
8 siblings, 0 replies; 13+ messages in thread
From: Orit Wasserman @ 2012-01-03 13:35 UTC (permalink / raw)
To: qemu-devel; +Cc: blauwirbel, stefanha, Orit Wasserman, quintela
Add page caching mechanism.
The pages are stored in the cache ordered by their address.
Signed-off-by: Orit Wasserman <owasserm@redhat.com>
---
arch_init.c | 183 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
1 files changed, 183 insertions(+), 0 deletions(-)
diff --git a/arch_init.c b/arch_init.c
index d4c92b0..fdda277 100644
--- a/arch_init.c
+++ b/arch_init.c
@@ -28,6 +28,7 @@
#include <sys/types.h>
#include <sys/mman.h>
#endif
+#include <assert.h>
#include "config.h"
#include "monitor.h"
#include "sysemu.h"
@@ -42,6 +43,14 @@
#include "gdbstub.h"
#include "hw/smbios.h"
+#ifdef DEBUG_ARCH_INIT
+#define DPRINTF(fmt, ...) \
+ do { fprintf(stdout, "arch_init: " fmt, ## __VA_ARGS__); } while (0)
+#else
+#define DPRINTF(fmt, ...) \
+ do { } while (0)
+#endif
+
#ifdef TARGET_SPARC
int graphic_width = 1024;
int graphic_height = 768;
@@ -94,6 +103,180 @@ const uint32_t arch_type = QEMU_ARCH;
#define RAM_SAVE_FLAG_EOS 0x10
#define RAM_SAVE_FLAG_CONTINUE 0x20
+/***********************************************************/
+/* Page cache for storing previous pages as basis for XBRLE compression */
+#define CACHE_N_WAY 2 /* 2-way assossiative cache */
+
+typedef struct CacheItem {
+ ram_addr_t it_addr;
+ unsigned long it_age;
+ uint8_t *it_data;
+} CacheItem;
+
+typedef struct CacheBucket {
+ CacheItem bkt_item[CACHE_N_WAY];
+} CacheBucket;
+
+static CacheBucket *page_cache;
+static int64_t cache_num_buckets;
+static uint64_t cache_max_item_age;
+static int64_t cache_num_items;
+
+static void cache_init(ssize_t num_buckets);
+static void cache_fini(void);
+static int cache_is_cached(ram_addr_t addr);
+static int cache_get_oldest(CacheBucket *buck);
+static int cache_get_newest(CacheBucket *buck, ram_addr_t addr);
+static void cache_insert(ram_addr_t id, uint8_t *pdata);
+static unsigned long cache_get_cache_pos(ram_addr_t address);
+static CacheItem *cache_item_get(unsigned long pos, int item);
+
+/***********************************************************/
+/* XBRLE (Xor Based Run-Length Encoding) */
+typedef struct XBRLEHeader {
+ uint8_t xh_flags;
+ uint16_t xh_len;
+ uint32_t xh_cksum;
+} XBRLEHeader;
+
+/***********************************************************/
+/* XBRLE page cache implementation */
+static CacheItem *cache_item_get(unsigned long pos, int item)
+{
+ assert(page_cache);
+ return &page_cache[pos].bkt_item[item];
+}
+
+static void cache_init(int64_t num_bytes)
+{
+ int i;
+
+ cache_num_items = 0;
+ cache_max_item_age = 0;
+ cache_num_buckets = num_bytes / (TARGET_PAGE_SIZE * CACHE_N_WAY);
+ assert(cache_num_buckets);
+ DPRINTF("Setting cache buckets to %lu\n", cache_num_buckets);
+
+ assert(!page_cache);
+ page_cache = (CacheBucket *)g_malloc0((cache_num_buckets) *
+ sizeof(CacheBucket));
+
+ for (i = 0; i < cache_num_buckets; i++) {
+ int j;
+ for (j = 0; j < CACHE_N_WAY; j++) {
+ CacheItem *it = cache_item_get(i, j);
+ it->it_data = NULL;
+ it->it_age = 0;
+ it->it_addr = -1;
+ }
+ }
+}
+
+static void cache_fini(void)
+{
+ int i;
+
+ assert(page_cache);
+
+ for (i = 0; i < cache_num_buckets; i++) {
+ int j;
+ for (j = 0; j < CACHE_N_WAY; j++) {
+ CacheItem *it = cache_item_get(i, j);
+ g_free(it->it_data);
+ it->it_data = 0;
+ }
+ }
+
+ g_free(page_cache);
+ page_cache = NULL;
+}
+
+static unsigned long cache_get_cache_pos(ram_addr_t address)
+{
+ unsigned long pos;
+
+ assert(cache_num_buckets);
+ pos = (address/TARGET_PAGE_SIZE) & (cache_num_buckets - 1);
+ return pos;
+}
+
+static int cache_get_newest(CacheBucket *buck, ram_addr_t addr)
+{
+ unsigned long big = 0;
+ int big_pos = -1;
+ int j;
+
+ assert(page_cache);
+
+ for (j = 0; j < CACHE_N_WAY; j++) {
+ CacheItem *it = &buck->bkt_item[j];
+
+ if (it->it_addr != addr) {
+ continue;
+ }
+
+ if (!j || it->it_age > big) {
+ big = it->it_age;
+ big_pos = j;
+ }
+ }
+
+ return big_pos;
+}
+
+static int cache_get_oldest(CacheBucket *buck)
+{
+ unsigned long small = 0;
+ int small_pos = -1;
+ int j;
+
+ assert(page_cache);
+
+ for (j = 0; j < CACHE_N_WAY; j++) {
+ CacheItem *it = &buck->bkt_item[j];
+
+ if (!j || it->it_age < small) {
+ small = it->it_age;
+ small_pos = j;
+ }
+ }
+
+ return small_pos;
+}
+
+static int cache_is_cached(ram_addr_t addr)
+{
+ unsigned long pos = cache_get_cache_pos(addr);
+
+ assert(page_cache);
+ CacheBucket *bucket = &page_cache[pos];
+ return cache_get_newest(bucket, addr);
+}
+
+static void cache_insert(unsigned long addr, uint8_t *pdata)
+{
+ unsigned long pos;
+ int slot = -1;
+ CacheBucket *bucket;
+
+ pos = cache_get_cache_pos(addr);
+ assert(page_cache);
+ bucket = &page_cache[pos];
+ slot = cache_get_oldest(bucket); /* evict LRU */
+
+ /* actual update of entry */
+ CacheItem *it = cache_item_get(pos, slot);
+ if (!it->it_data) {
+ cache_num_items++;
+ }
+ g_free(it->it_data);
+
+ it->it_data = g_malloc0(TARGET_PAGE_SIZE);
+ memcpy(it->it_data, pdata, TARGET_PAGE_SIZE);
+ it->it_age = ++cache_max_item_age;
+ it->it_addr = addr;
+}
+
static int is_dup_page(uint8_t *page, uint8_t ch)
{
uint32_t val = ch << 24 | ch << 16 | ch << 8 | ch;
--
1.7.6.5
^ permalink raw reply related [flat|nested] 13+ messages in thread* [Qemu-devel] [PATCH v5 2/9] Add rle_encode and rle_decode functions Implement Run Length Encoding compression
2012-01-03 13:35 [Qemu-devel] [PATCH v5 0/9] XBZRLE delta for live migration of large memory apps Orit Wasserman
2012-01-03 13:35 ` [Qemu-devel] [PATCH v5 1/9] Add cache handling functions Orit Wasserman
@ 2012-01-03 13:35 ` Orit Wasserman
2012-01-03 13:35 ` [Qemu-devel] [PATCH v5 3/9] Add save_block_hdr function Orit Wasserman
` (6 subsequent siblings)
8 siblings, 0 replies; 13+ messages in thread
From: Orit Wasserman @ 2012-01-03 13:35 UTC (permalink / raw)
To: qemu-devel; +Cc: blauwirbel, stefanha, Orit Wasserman, quintela
Signed-off-by: Orit Wasserman <owasserm@redhat.com>
---
arch_init.c | 58 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
1 files changed, 58 insertions(+), 0 deletions(-)
diff --git a/arch_init.c b/arch_init.c
index fdda277..426b34d 100644
--- a/arch_init.c
+++ b/arch_init.c
@@ -139,6 +139,9 @@ typedef struct XBRLEHeader {
uint32_t xh_cksum;
} XBRLEHeader;
+static int rle_encode(uint8_t *src, int slen, uint8_t *dst, int dlen);
+static int rle_decode(uint8_t *src, int slen, uint8_t *dst, int dlen);
+
/***********************************************************/
/* XBRLE page cache implementation */
static CacheItem *cache_item_get(unsigned long pos, int item)
@@ -277,6 +280,61 @@ static void cache_insert(unsigned long addr, uint8_t *pdata)
it->it_addr = addr;
}
+/* XBRLE (Xor Based Run-Length Encoding) */
+static int rle_encode(uint8_t *src, int slen, uint8_t *dst, int dlen)
+{
+ int d = 0, ch_run = 0, i;
+ uint8_t prev = 0, ch = 0;
+
+ for (i = 0; i <= slen; i++) {
+ if (i != slen) {
+ ch = src[i];
+ }
+
+ if (!i || (i != slen && ch == prev && ch_run < 255)) {
+ ch_run++;
+ } else {
+ if (d+2 > dlen) {
+ return -1;
+ }
+ *dst++ = ch_run;
+ *dst++ = prev;
+ d += 2;
+ ch_run = 1;
+ }
+
+ prev = ch;
+ }
+ return d;
+}
+
+static int rle_decode(uint8_t *src, int slen, uint8_t *dst, int dlen)
+{
+ int d = 0, s;
+
+ for (s = 0; s < slen-1; s += 2) {
+ uint8_t ch_run = src[s];
+ uint8_t ch = src[s+1];
+ while (ch_run--) {
+ if (d == dlen) {
+ return -1;
+ }
+ dst[d] = ch;
+ d++;
+ }
+ }
+ return d;
+}
+
+static void xor_encode(uint8_t *dst, uint8_t *src1, uint8_t *src2)
+{
+ int i;
+
+ for (i = 0; i < TARGET_PAGE_SIZE; i++) {
+ dst[i] = src1[i] ^ src2[i];
+ }
+}
+
static int is_dup_page(uint8_t *page, uint8_t ch)
{
uint32_t val = ch << 24 | ch << 16 | ch << 8 | ch;
--
1.7.6.5
^ permalink raw reply related [flat|nested] 13+ messages in thread* [Qemu-devel] [PATCH v5 3/9] Add save_block_hdr function
2012-01-03 13:35 [Qemu-devel] [PATCH v5 0/9] XBZRLE delta for live migration of large memory apps Orit Wasserman
2012-01-03 13:35 ` [Qemu-devel] [PATCH v5 1/9] Add cache handling functions Orit Wasserman
2012-01-03 13:35 ` [Qemu-devel] [PATCH v5 2/9] Add rle_encode and rle_decode functions Implement Run Length Encoding compression Orit Wasserman
@ 2012-01-03 13:35 ` Orit Wasserman
2012-01-03 13:35 ` [Qemu-devel] [PATCH v5 4/9] Add host_from_stream_offset_versioned function Orit Wasserman
` (5 subsequent siblings)
8 siblings, 0 replies; 13+ messages in thread
From: Orit Wasserman @ 2012-01-03 13:35 UTC (permalink / raw)
To: qemu-devel; +Cc: blauwirbel, stefanha, Orit Wasserman, quintela
Signed-off-by: Orit Wasserman <owasserm@redhat.com>
---
arch_init.c | 30 +++++++++++++++---------------
1 files changed, 15 insertions(+), 15 deletions(-)
diff --git a/arch_init.c b/arch_init.c
index 426b34d..e87dfbc 100644
--- a/arch_init.c
+++ b/arch_init.c
@@ -335,6 +335,17 @@ static void xor_encode(uint8_t *dst, uint8_t *src1, uint8_t *src2)
}
}
+static void save_block_hdr(QEMUFile *f, RAMBlock *block, ram_addr_t offset,
+ int cont, int flag)
+{
+ qemu_put_be64(f, offset | cont | flag);
+ if (!cont) {
+ qemu_put_byte(f, strlen(block->idstr));
+ qemu_put_buffer(f, (uint8_t *)block->idstr,
+ strlen(block->idstr));
+ }
+}
+
static int is_dup_page(uint8_t *page, uint8_t ch)
{
uint32_t val = ch << 24 | ch << 16 | ch << 8 | ch;
@@ -377,23 +388,12 @@ static int ram_save_block(QEMUFile *f)
p = block->host + offset;
if (is_dup_page(p, *p)) {
- qemu_put_be64(f, offset | cont | RAM_SAVE_FLAG_COMPRESS);
- if (!cont) {
- qemu_put_byte(f, strlen(block->idstr));
- qemu_put_buffer(f, (uint8_t *)block->idstr,
- strlen(block->idstr));
- }
+ save_block_hdr(f, block, offset, cont, RAM_SAVE_FLAG_COMPRESS);
qemu_put_byte(f, *p);
bytes_sent = 1;
- } else {
- qemu_put_be64(f, offset | cont | RAM_SAVE_FLAG_PAGE);
- if (!cont) {
- qemu_put_byte(f, strlen(block->idstr));
- qemu_put_buffer(f, (uint8_t *)block->idstr,
- strlen(block->idstr));
- }
- qemu_put_buffer(f, p, TARGET_PAGE_SIZE);
- bytes_sent = TARGET_PAGE_SIZE;
+ save_block_hdr(f, block, offset, cont, RAM_SAVE_FLAG_PAGE);
+ qemu_put_buffer(f, p, TARGET_PAGE_SIZE);
+ bytes_sent = TARGET_PAGE_SIZE;
}
break;
--
1.7.6.5
^ permalink raw reply related [flat|nested] 13+ messages in thread* [Qemu-devel] [PATCH v5 4/9] Add host_from_stream_offset_versioned function
2012-01-03 13:35 [Qemu-devel] [PATCH v5 0/9] XBZRLE delta for live migration of large memory apps Orit Wasserman
` (2 preceding siblings ...)
2012-01-03 13:35 ` [Qemu-devel] [PATCH v5 3/9] Add save_block_hdr function Orit Wasserman
@ 2012-01-03 13:35 ` Orit Wasserman
2012-01-03 13:35 ` [Qemu-devel] [PATCH v5 5/9] Add XBRLE to ram_save_block and ram_save_live Orit Wasserman
` (4 subsequent siblings)
8 siblings, 0 replies; 13+ messages in thread
From: Orit Wasserman @ 2012-01-03 13:35 UTC (permalink / raw)
To: qemu-devel; +Cc: blauwirbel, stefanha, Orit Wasserman, quintela
Signed-off-by: Orit Wasserman <owasserm@redhat.com>
---
arch_init.c | 35 +++++++++++++++++++++--------------
1 files changed, 21 insertions(+), 14 deletions(-)
diff --git a/arch_init.c b/arch_init.c
index e87dfbc..05b8053 100644
--- a/arch_init.c
+++ b/arch_init.c
@@ -613,6 +613,23 @@ static inline void *host_from_stream_offset(QEMUFile *f,
return NULL;
}
+static inline void *host_from_stream_offset_versioned(int version_id,
+ QEMUFile *f, ram_addr_t offset, int flags)
+{
+ void *host;
+ if (version_id == 3) {
+ host = qemu_get_ram_ptr(offset);
+ } else {
+ host = host_from_stream_offset(f, offset, flags);
+ }
+ if (!host) {
+ fprintf(stderr, "Failed to convert RAM address to host"
+ " for offset 0x%lX!\n", offset);
+ abort();
+ }
+ return host;
+}
+
int ram_load(QEMUFile *f, void *opaque, int version_id)
{
ram_addr_t addr;
@@ -669,17 +686,10 @@ int ram_load(QEMUFile *f, void *opaque, int version_id)
}
if (flags & RAM_SAVE_FLAG_COMPRESS) {
- void *host;
uint8_t ch;
- if (version_id == 3)
- host = qemu_get_ram_ptr(addr);
- else
- host = host_from_stream_offset(f, addr, flags);
- if (!host) {
- return -EINVAL;
- }
-
+ host = host_from_stream_offset_versioned(version_id,
+ f, addr, flags);
ch = qemu_get_byte(f);
memset(host, ch, TARGET_PAGE_SIZE);
#ifndef _WIN32
@@ -691,11 +701,8 @@ int ram_load(QEMUFile *f, void *opaque, int version_id)
} else if (flags & RAM_SAVE_FLAG_PAGE) {
void *host;
- if (version_id == 3)
- host = qemu_get_ram_ptr(addr);
- else
- host = host_from_stream_offset(f, addr, flags);
-
+ host = host_from_stream_offset_versioned(version_id,
+ f, addr, flags);
qemu_get_buffer(f, host, TARGET_PAGE_SIZE);
}
error = qemu_file_get_error(f);
--
1.7.6.5
^ permalink raw reply related [flat|nested] 13+ messages in thread* [Qemu-devel] [PATCH v5 5/9] Add XBRLE to ram_save_block and ram_save_live
2012-01-03 13:35 [Qemu-devel] [PATCH v5 0/9] XBZRLE delta for live migration of large memory apps Orit Wasserman
` (3 preceding siblings ...)
2012-01-03 13:35 ` [Qemu-devel] [PATCH v5 4/9] Add host_from_stream_offset_versioned function Orit Wasserman
@ 2012-01-03 13:35 ` Orit Wasserman
2012-01-03 13:35 ` [Qemu-devel] [PATCH v5 6/9] Add xbrle parameters to MigrationState Orit Wasserman
` (3 subsequent siblings)
8 siblings, 0 replies; 13+ messages in thread
From: Orit Wasserman @ 2012-01-03 13:35 UTC (permalink / raw)
To: qemu-devel; +Cc: blauwirbel, stefanha, Orit Wasserman, quintela
Add migration state to store XBRLE params (enablement and cache size).
In the outgoing check to see if the page is cached and
send compressed page by using save_xbrle_page function.
In the incoming migration check to see if RAM_SAVE_FLAG_XBRLE is set
decompress the page (by using load_xbrle function).
Signed-off-by: Orit Wasserman <owasserm@redhat.com>
---
arch_init.c | 173 +++++++++++++++++++++++++++++++++++++++++++++++++++++++----
1 files changed, 163 insertions(+), 10 deletions(-)
diff --git a/arch_init.c b/arch_init.c
index 05b8053..6b839a1 100644
--- a/arch_init.c
+++ b/arch_init.c
@@ -102,6 +102,7 @@ const uint32_t arch_type = QEMU_ARCH;
#define RAM_SAVE_FLAG_PAGE 0x08
#define RAM_SAVE_FLAG_EOS 0x10
#define RAM_SAVE_FLAG_CONTINUE 0x20
+#define RAM_SAVE_FLAG_XBRLE 0x40
/***********************************************************/
/* Page cache for storing previous pages as basis for XBRLE compression */
@@ -132,6 +133,22 @@ static unsigned long cache_get_cache_pos(ram_addr_t address);
static CacheItem *cache_item_get(unsigned long pos, int item);
/***********************************************************/
+/* RAM Migration State */
+typedef struct ArchMigrationState {
+ int use_xbrle;
+ int64_t xbrle_cache_size;
+} ArchMigrationState;
+
+static ArchMigrationState arch_mig_state;
+
+void arch_set_params(int blk_enable, int shared_base, int use_xbrle,
+ int64_t xbrle_cache_size, void *opaque)
+{
+ arch_mig_state.use_xbrle = use_xbrle;
+ arch_mig_state.xbrle_cache_size = xbrle_cache_size;
+}
+
+/***********************************************************/
/* XBRLE (Xor Based Run-Length Encoding) */
typedef struct XBRLEHeader {
uint8_t xh_flags;
@@ -346,6 +363,55 @@ static void save_block_hdr(QEMUFile *f, RAMBlock *block, ram_addr_t offset,
}
}
+#define ENCODING_FLAG_XBRLE 0x1
+
+static int save_xbrle_page(QEMUFile *f, uint8_t *current_data,
+ ram_addr_t current_addr, RAMBlock *block, ram_addr_t offset, int cont)
+{
+ int cache_location = -1, slot = -1, encoded_len = 0, bytes_sent = 0;
+ XBRLEHeader hdr = {0};
+ CacheItem *it;
+ uint8_t *xor_buf = NULL, *xbrle_buf = NULL;
+
+ /* get location */
+ slot = cache_is_cached(current_addr);
+ if (slot == -1) {
+ goto done;
+ }
+ cache_location = cache_get_cache_pos(current_addr);
+
+ /* abort if page changed too much */
+ it = cache_item_get(cache_location, slot);
+
+ /* XOR encoding */
+ xor_buf = (uint8_t *) g_malloc0(TARGET_PAGE_SIZE);
+ xor_encode(xor_buf, it->it_data, current_data);
+
+ /* XBRLE (XOR+RLE) encoding (if we can ensure a 1/3 ratio) */
+ xbrle_buf = (uint8_t *) g_malloc0(TARGET_PAGE_SIZE);
+ encoded_len = rle_encode(xor_buf, TARGET_PAGE_SIZE, xbrle_buf,
+ TARGET_PAGE_SIZE/3);
+
+ if (encoded_len < 0) {
+ DPRINTF("XBRLE encoding oeverflow - sending uncompressed\n");
+ goto done;
+ }
+
+ hdr.xh_len = encoded_len;
+ hdr.xh_flags |= ENCODING_FLAG_XBRLE;
+
+ /* Send XBRLE compressed page */
+ save_block_hdr(f, block, offset, cont, RAM_SAVE_FLAG_XBRLE);
+ qemu_put_buffer(f, (uint8_t *) &hdr, sizeof(hdr));
+ qemu_put_buffer(f, xbrle_buf, encoded_len);
+ bytes_sent = encoded_len + sizeof(hdr);
+
+done:
+ g_free(xor_buf);
+ g_free(xbrle_buf);
+ return bytes_sent;
+}
+
static int is_dup_page(uint8_t *page, uint8_t ch)
{
uint32_t val = ch << 24 | ch << 16 | ch << 8 | ch;
@@ -364,7 +430,7 @@ static int is_dup_page(uint8_t *page, uint8_t ch)
static RAMBlock *last_block;
static ram_addr_t last_offset;
-static int ram_save_block(QEMUFile *f)
+static int ram_save_block(QEMUFile *f, int stage)
{
RAMBlock *block = last_block;
ram_addr_t offset = last_offset;
@@ -391,10 +457,18 @@ static int ram_save_block(QEMUFile *f)
save_block_hdr(f, block, offset, cont, RAM_SAVE_FLAG_COMPRESS);
qemu_put_byte(f, *p);
bytes_sent = 1;
+ } else if (stage == 2 && arch_mig_state.use_xbrle) {
+ bytes_sent = save_xbrle_page(f, p, current_addr, block,
+ offset, cont);
+ }
+ if (!bytes_sent) {
save_block_hdr(f, block, offset, cont, RAM_SAVE_FLAG_PAGE);
qemu_put_buffer(f, p, TARGET_PAGE_SIZE);
bytes_sent = TARGET_PAGE_SIZE;
}
+ if (arch_mig_state.use_xbrle) {
+ cache_insert(current_addr, p);
+ }
break;
}
@@ -501,6 +575,10 @@ int ram_save_live(Monitor *mon, QEMUFile *f, int stage, void *opaque)
if (stage < 0) {
cpu_physical_memory_set_dirty_tracking(0);
+ if (arch_mig_state.use_xbrle) {
+ cache_fini();
+ }
+
return 0;
}
@@ -516,6 +594,10 @@ int ram_save_live(Monitor *mon, QEMUFile *f, int stage, void *opaque)
last_offset = 0;
sort_ram_list();
+ if (arch_mig_state.use_xbrle) {
+ cache_init(arch_mig_state.xbrle_cache_size);
+ }
+
/* Make sure all dirty bits are set */
QLIST_FOREACH(block, &ram_list.blocks, next) {
for (addr = block->offset; addr < block->offset + block->length;
@@ -545,7 +627,7 @@ int ram_save_live(Monitor *mon, QEMUFile *f, int stage, void *opaque)
while ((ret = qemu_file_rate_limit(f)) == 0) {
int bytes_sent;
- bytes_sent = ram_save_block(f);
+ bytes_sent = ram_save_block(f, stage);
bytes_transferred += bytes_sent;
if (bytes_sent == 0) { /* no more blocks */
break;
@@ -570,19 +652,71 @@ int ram_save_live(Monitor *mon, QEMUFile *f, int stage, void *opaque)
int bytes_sent;
/* flush all remaining blocks regardless of rate limiting */
- while ((bytes_sent = ram_save_block(f)) != 0) {
+ while ((bytes_sent = ram_save_block(f, stage)) != 0) {
bytes_transferred += bytes_sent;
}
cpu_physical_memory_set_dirty_tracking(0);
+ if (arch_mig_state.use_xbrle) {
+ cache_fini();
+ }
}
qemu_put_be64(f, RAM_SAVE_FLAG_EOS);
expected_time = ram_save_remaining() * TARGET_PAGE_SIZE / bwidth;
+ DPRINTF("ram_save_live: expected(%ld) <= max(%ld)?\n", expected_time,
+ migrate_max_downtime());
+
return (stage == 2) && (expected_time <= migrate_max_downtime());
}
+static int load_xbrle(QEMUFile *f, ram_addr_t addr, void *host)
+{
+ int ret, rc = -1;
+ uint8_t *prev_page, *xor_buf = NULL, *xbrle_buf = NULL;
+ XBRLEHeader hdr = {0};
+
+ /* extract RLE header */
+ qemu_get_buffer(f, (uint8_t *) &hdr, sizeof(hdr));
+ if (!(hdr.xh_flags & ENCODING_FLAG_XBRLE)) {
+ fprintf(stderr, "Failed to load XBRLE page - wrong compression!\n");
+ goto done;
+ }
+
+ if (hdr.xh_len > TARGET_PAGE_SIZE) {
+ fprintf(stderr, "Failed to load XBRLE page - len overflow!\n");
+ goto done;
+ }
+
+ /* load data and decode */
+ xbrle_buf = (uint8_t *) g_malloc0(TARGET_PAGE_SIZE);
+ qemu_get_buffer(f, xbrle_buf, hdr.xh_len);
+
+ /* decode RLE */
+ xor_buf = (uint8_t *) g_malloc0(TARGET_PAGE_SIZE);
+ ret = rle_decode(xbrle_buf, hdr.xh_len, xor_buf, TARGET_PAGE_SIZE);
+ if (ret == -1) {
+ fprintf(stderr, "Failed to load XBRLE page - decode error!\n");
+ goto done;
+ }
+
+ if (ret != TARGET_PAGE_SIZE) {
+ fprintf(stderr, "Failed to load XBRLE page - size %d expected %d!\n",
+ ret, TARGET_PAGE_SIZE);
+ goto done;
+ }
+
+ /* decode XOR delta */
+ prev_page = host;
+ xor_encode(prev_page, prev_page, xor_buf);
+ rc = 0;
+done:
+ g_free(xor_buf);
+ g_free(xbrle_buf);
+ return rc;
+}
+
static inline void *host_from_stream_offset(QEMUFile *f,
ram_addr_t offset,
int flags)
@@ -633,14 +767,18 @@ static inline void *host_from_stream_offset_versioned(int version_id,
int ram_load(QEMUFile *f, void *opaque, int version_id)
{
ram_addr_t addr;
- int flags;
+ int flags, ret = 0;
int error;
+ static uint64_t seq_iter;
+
+ seq_iter++;
if (version_id < 3 || version_id > 4) {
return -EINVAL;
}
do {
+ void *host;
addr = qemu_get_be64(f);
flags = addr & ~TARGET_PAGE_MASK;
@@ -649,7 +787,8 @@ int ram_load(QEMUFile *f, void *opaque, int version_id)
if (flags & RAM_SAVE_FLAG_MEM_SIZE) {
if (version_id == 3) {
if (addr != ram_bytes_total()) {
- return -EINVAL;
+ ret = -EINVAL;
+ goto done;
}
} else {
/* Synchronize RAM block list */
@@ -668,8 +807,10 @@ int ram_load(QEMUFile *f, void *opaque, int version_id)
QLIST_FOREACH(block, &ram_list.blocks, next) {
if (!strncmp(id, block->idstr, sizeof(id))) {
- if (block->length != length)
- return -EINVAL;
+ if (block->length != length) {
+ ret = -EINVAL;
+ goto done;
+ }
break;
}
}
@@ -677,7 +818,8 @@ int ram_load(QEMUFile *f, void *opaque, int version_id)
if (!block) {
fprintf(stderr, "Unknown ramblock \"%s\", cannot "
"accept migration\n", id);
- return -EINVAL;
+ ret = -EINVAL;
+ goto done;
}
total_ram_bytes -= length;
@@ -704,14 +846,25 @@ int ram_load(QEMUFile *f, void *opaque, int version_id)
host = host_from_stream_offset_versioned(version_id,
f, addr, flags);
qemu_get_buffer(f, host, TARGET_PAGE_SIZE);
+ } else if (flags & RAM_SAVE_FLAG_XBRLE) {
+ host = host_from_stream_offset_versioned(version_id,
+ f, addr, flags);
+ if (load_xbrle(f, addr, host) < 0) {
+ ret = -EINVAL;
+ goto done;
+ }
}
error = qemu_file_get_error(f);
if (error) {
- return error;
+ ret = error;
+ goto done;
}
} while (!(flags & RAM_SAVE_FLAG_EOS));
- return 0;
+done:
+ DPRINTF("Completed load of VM with exit code %d seq iteration %ld\n",
+ ret, seq_iter);
+ return ret;
}
#ifdef HAS_AUDIO
--
1.7.6.5
^ permalink raw reply related [flat|nested] 13+ messages in thread* [Qemu-devel] [PATCH v5 6/9] Add xbrle parameters to MigrationState
2012-01-03 13:35 [Qemu-devel] [PATCH v5 0/9] XBZRLE delta for live migration of large memory apps Orit Wasserman
` (4 preceding siblings ...)
2012-01-03 13:35 ` [Qemu-devel] [PATCH v5 5/9] Add XBRLE to ram_save_block and ram_save_live Orit Wasserman
@ 2012-01-03 13:35 ` Orit Wasserman
2012-01-03 13:35 ` [Qemu-devel] [PATCH v5 7/9] Add set_cachesize to change XBRLE cache size Orit Wasserman
` (2 subsequent siblings)
8 siblings, 0 replies; 13+ messages in thread
From: Orit Wasserman @ 2012-01-03 13:35 UTC (permalink / raw)
To: qemu-devel; +Cc: blauwirbel, stefanha, Orit Wasserman, quintela
Signed-off-by: Orit Wasserman <owasserm@redhat.com>
---
block-migration.c | 4 +++-
hw/hw.h | 4 +++-
migration.c | 15 +++++++++++++--
migration.h | 3 +++
savevm.c | 11 +++++++----
sysemu.h | 4 +++-
6 files changed, 32 insertions(+), 9 deletions(-)
diff --git a/block-migration.c b/block-migration.c
index 2b7edbc..60f2d62 100644
--- a/block-migration.c
+++ b/block-migration.c
@@ -706,7 +706,9 @@ static int block_load(QEMUFile *f, void *opaque, int version_id)
return 0;
}
-static void block_set_params(int blk_enable, int shared_base, void *opaque)
+static void block_set_params(int blk_enable, int shared_base,
+ int use_xbrle, int64_t xbrle_cache_size,
+ void *opaque)
{
block_mig_state.blk_enable = blk_enable;
block_mig_state.shared_base = shared_base;
diff --git a/hw/hw.h b/hw/hw.h
index efa04d1..ab0b92c 100644
--- a/hw/hw.h
+++ b/hw/hw.h
@@ -245,7 +245,9 @@ static inline void qemu_get_sbe64s(QEMUFile *f, int64_t *pv)
int64_t qemu_ftell(QEMUFile *f);
int64_t qemu_fseek(QEMUFile *f, int64_t pos, int whence);
-typedef void SaveSetParamsHandler(int blk_enable, int shared, void * opaque);
+typedef void SaveSetParamsHandler(int blk_enable, int shared,
+ int use_xbrle, int64_t xbrle_cache_size,
+ void *opaque);
typedef void SaveStateHandler(QEMUFile *f, void *opaque);
typedef int SaveLiveStateHandler(Monitor *mon, QEMUFile *f, int stage,
void *opaque);
diff --git a/migration.c b/migration.c
index 412fdfe..ed47958 100644
--- a/migration.c
+++ b/migration.c
@@ -41,6 +41,11 @@ enum {
#define MAX_THROTTLE (32 << 20) /* Migration speed throttling */
+/* Migration XBRLE cache size */
+#define DEFAULT_MIGRATE_CACHE_SIZE (64 * 1024 * 1024)
+
+static int64_t migrate_cache_size = DEFAULT_MIGRATE_CACHE_SIZE;
+
static NotifierList migration_state_notifiers =
NOTIFIER_LIST_INITIALIZER(migration_state_notifiers);
@@ -365,7 +370,8 @@ void migrate_fd_connect(MigrationState *s)
migrate_fd_close);
DPRINTF("beginning savevm\n");
- ret = qemu_savevm_state_begin(s->mon, s->file, s->blk, s->shared);
+ ret = qemu_savevm_state_begin(s->mon, s->file, s->blk, s->shared,
+ s->use_xbrle, s->xbrle_cache_size);
if (ret < 0) {
DPRINTF("failed, %d\n", ret);
migrate_fd_error(s);
@@ -375,6 +381,8 @@ void migrate_fd_connect(MigrationState *s)
}
static MigrationState *migrate_init(Monitor *mon, int detach, int blk, int inc)
+static MigrationState *migrate_init(Monitor *mon, int detach, int blk, int inc,
+ int use_xbrle, int64_t xbrle_cache_size)
{
MigrationState *s = migrate_get_current();
int64_t bandwidth_limit = s->bandwidth_limit;
@@ -383,6 +391,8 @@ static MigrationState *migrate_init(Monitor *mon, int detach, int blk, int inc)
s->bandwidth_limit = bandwidth_limit;
s->blk = blk;
s->shared = inc;
+ s->use_xbrle = use_xbrle;
+ s->xbrle_cache_size = xbrle_cache_size;
/* s->mon is used for two things:
- pass fd in fd migration
@@ -418,6 +428,7 @@ int do_migrate(Monitor *mon, const QDict *qdict, QObject **ret_data)
int detach = qdict_get_try_bool(qdict, "detach", 0);
int blk = qdict_get_try_bool(qdict, "blk", 0);
int inc = qdict_get_try_bool(qdict, "inc", 0);
+ int use_xbrle = qdict_get_try_bool(qdict, "xbrle", 0);
const char *uri = qdict_get_str(qdict, "uri");
int ret;
@@ -436,7 +447,7 @@ int do_migrate(Monitor *mon, const QDict *qdict, QObject **ret_data)
return -1;
}
- s = migrate_init(mon, detach, blk, inc);
+ s = migrate_init(mon, detach, blk, inc, use_xbrle, migrate_cache_size);
if (strstart(uri, "tcp:", &p)) {
ret = tcp_start_outgoing_migration(s, p);
diff --git a/migration.h b/migration.h
index 372b066..592af6a 100644
--- a/migration.h
+++ b/migration.h
@@ -34,6 +34,9 @@ struct MigrationState
void *opaque;
int blk;
int shared;
+ int use_xbrle;
+ int64_t xbrle_cache_size;
+
};
void process_incoming_migration(QEMUFile *f);
diff --git a/savevm.c b/savevm.c
index f153c25..3650f56 100644
--- a/savevm.c
+++ b/savevm.c
@@ -1277,7 +1277,8 @@ int register_savevm(DeviceState *dev,
void *opaque)
{
return register_savevm_live(dev, idstr, instance_id, version_id,
- NULL, NULL, save_state, load_state, opaque);
+ arch_set_params, NULL, save_state,
+ load_state, opaque);
}
void unregister_savevm(DeviceState *dev, const char *idstr, void *opaque)
@@ -1554,7 +1555,8 @@ bool qemu_savevm_state_blocked(Monitor *mon)
}
int qemu_savevm_state_begin(Monitor *mon, QEMUFile *f, int blk_enable,
- int shared)
+ int shared, int use_xbrle,
+ int64_t xbrle_cache_size)
{
SaveStateEntry *se;
int ret;
@@ -1563,7 +1565,8 @@ int qemu_savevm_state_begin(Monitor *mon, QEMUFile *f, int blk_enable,
if(se->set_params == NULL) {
continue;
}
- se->set_params(blk_enable, shared, se->opaque);
+ se->set_params(blk_enable, shared, use_xbrle, xbrle_cache_size,
+ se->opaque);
}
qemu_put_be32(f, QEMU_VM_FILE_MAGIC);
@@ -1707,7 +1710,7 @@ static int qemu_savevm_state(Monitor *mon, QEMUFile *f)
goto out;
}
- ret = qemu_savevm_state_begin(mon, f, 0, 0);
+ ret = qemu_savevm_state_begin(mon, f, 0, 0, 0, 0);
if (ret < 0)
goto out;
diff --git a/sysemu.h b/sysemu.h
index 3806901..78e1074 100644
--- a/sysemu.h
+++ b/sysemu.h
@@ -67,7 +67,8 @@ void qemu_announce_self(void);
bool qemu_savevm_state_blocked(Monitor *mon);
int qemu_savevm_state_begin(Monitor *mon, QEMUFile *f, int blk_enable,
- int shared);
+ int shared, int use_xbrle,
+ int64_t xbrle_cache_size);
int qemu_savevm_state_iterate(Monitor *mon, QEMUFile *f);
int qemu_savevm_state_complete(Monitor *mon, QEMUFile *f);
void qemu_savevm_state_cancel(Monitor *mon, QEMUFile *f);
@@ -174,4 +175,5 @@ void register_devices(void);
void add_boot_device_path(int32_t bootindex, DeviceState *dev,
const char *suffix);
char *get_boot_devices_list(uint32_t *size);
+
#endif
--
1.7.6.5
^ permalink raw reply related [flat|nested] 13+ messages in thread* [Qemu-devel] [PATCH v5 7/9] Add set_cachesize to change XBRLE cache size
2012-01-03 13:35 [Qemu-devel] [PATCH v5 0/9] XBZRLE delta for live migration of large memory apps Orit Wasserman
` (5 preceding siblings ...)
2012-01-03 13:35 ` [Qemu-devel] [PATCH v5 6/9] Add xbrle parameters to MigrationState Orit Wasserman
@ 2012-01-03 13:35 ` Orit Wasserman
2012-01-03 13:35 ` [Qemu-devel] [PATCH v5 8/9] QMP commands changes Orit Wasserman
2012-01-03 13:35 ` [Qemu-devel] [PATCH v5 9/9] Add XBRLE statistics information Orit Wasserman
8 siblings, 0 replies; 13+ messages in thread
From: Orit Wasserman @ 2012-01-03 13:35 UTC (permalink / raw)
To: qemu-devel; +Cc: blauwirbel, stefanha, Orit Wasserman, quintela
Signed-off-by: Orit Wasserman <owasserm@redhat.com>
---
migration.c | 25 ++++++++++++++++++++++++-
migration.h | 7 +++++++
2 files changed, 31 insertions(+), 1 deletions(-)
diff --git a/migration.c b/migration.c
index ed47958..3d88cdd 100644
--- a/migration.c
+++ b/migration.c
@@ -380,7 +380,30 @@ void migrate_fd_connect(MigrationState *s)
migrate_fd_put_ready(s);
}
-static MigrationState *migrate_init(Monitor *mon, int detach, int blk, int inc)
+void do_migrate_set_cachesize(Monitor *mon, const QDict *qdict)
+{
+ ssize_t bytes;
+ const char *value = qdict_get_str(qdict, "value");
+
+ bytes = strtosz(value, NULL);
+ if (bytes < 0) {
+ monitor_printf(mon, "invalid cache size: %s\n", value);
+ return;
+ }
+
+ /* On 32-bit hosts, QEMU is limited by virtual address space */
+ if (bytes > (2047 << 20) && HOST_LONG_BITS == 32) {
+ monitor_printf(mon, "cache can't exceed 2047 MB RAM limit on host\n");
+ return;
+ }
+ if (bytes != (uint64_t) bytes) {
+ monitor_printf(mon, "cache size too large\n");
+ return;
+ }
+
+ migrate_cache_size = bytes;
+}
+
static MigrationState *migrate_init(Monitor *mon, int detach, int blk, int inc,
int use_xbrle, int64_t xbrle_cache_size)
{
diff --git a/migration.h b/migration.h
index 592af6a..6de09c8 100644
--- a/migration.h
+++ b/migration.h
@@ -98,4 +98,11 @@ void migrate_add_blocker(Error *reason);
*/
void migrate_del_blocker(Error *reason);
+void do_migrate_set_cachesize(Monitor *mon, const QDict *qdict);
+
+void arch_set_params(int blk_enable, int shared_base,
+ int use_xbrle, int64_t xbrle_cache_size, void *opaque);
+
+int xbrle_mig_active(void);
+
#endif
--
1.7.6.5
^ permalink raw reply related [flat|nested] 13+ messages in thread* [Qemu-devel] [PATCH v5 8/9] QMP commands changes
2012-01-03 13:35 [Qemu-devel] [PATCH v5 0/9] XBZRLE delta for live migration of large memory apps Orit Wasserman
` (6 preceding siblings ...)
2012-01-03 13:35 ` [Qemu-devel] [PATCH v5 7/9] Add set_cachesize to change XBRLE cache size Orit Wasserman
@ 2012-01-03 13:35 ` Orit Wasserman
2012-01-03 13:35 ` [Qemu-devel] [PATCH v5 9/9] Add XBRLE statistics information Orit Wasserman
8 siblings, 0 replies; 13+ messages in thread
From: Orit Wasserman @ 2012-01-03 13:35 UTC (permalink / raw)
To: qemu-devel; +Cc: blauwirbel, stefanha, Orit Wasserman, quintela
Signed-off-by: Orit Wasserman <owasserm@redhat.com>
---
hmp-commands.hx | 34 ++++++++++++++++++++++++++--------
qmp-commands.hx | 44 +++++++++++++++++++++++++++++++++++++-------
2 files changed, 63 insertions(+), 15 deletions(-)
diff --git a/hmp-commands.hx b/hmp-commands.hx
index 14838b7..952d5cd 100644
--- a/hmp-commands.hx
+++ b/hmp-commands.hx
@@ -746,24 +746,29 @@ ETEXI
{
.name = "migrate",
- .args_type = "detach:-d,blk:-b,inc:-i,uri:s",
- .params = "[-d] [-b] [-i] uri",
- .help = "migrate to URI (using -d to not wait for completion)"
- "\n\t\t\t -b for migration without shared storage with"
- " full copy of disk\n\t\t\t -i for migration without "
- "shared storage with incremental copy of disk "
- "(base image shared between src and destination)",
+ .args_type = "detach:-d,blk:-b,inc:-i,xbrle:-x,uri:s",
+ .params = "[-d] [-b] [-i] [-x] uri",
+ .help = "migrate to URI"
+ "\n\t -d to not wait for completion"
+ "\n\t -b for migration without shared storage with"
+ " full copy of disk"
+ "\n\t -i for migration without"
+ " shared storage with incremental copy of disk"
+ " (base image shared between source and destination)"
+ "\n\t -x to use XBRLE page delta compression",
.user_print = monitor_user_noop,
.mhandler.cmd_new = do_migrate,
},
STEXI
-@item migrate [-d] [-b] [-i] @var{uri}
+@item migrate [-d] [-b] [-i] [-x] @var{uri}
@findex migrate
Migrate to @var{uri} (using -d to not wait for completion).
-b for migration with full copy of disk
-i for migration with incremental copy of disk (base image is shared)
+ -x to use XBRLE page delta compression
+
ETEXI
{
@@ -781,6 +786,19 @@ Cancel the current VM migration.
ETEXI
{
+ .name = "migrate_set_cachesize",
+ .args_type = "value:s",
+ .params = "value",
+ .help = "set cache size (in MB) for XBRLE migrations",
+ .mhandler.cmd = do_migrate_set_cachesize,
+ },
+
+STEXI
+@item migrate_set_cachesize @var{value}
+Set cache size (in MB) for xbrle migrations.
+ETEXI
+
+ {
.name = "migrate_set_speed",
.args_type = "value:o",
.params = "value",
diff --git a/qmp-commands.hx b/qmp-commands.hx
index 7e3f4b9..34bdfe9 100644
--- a/qmp-commands.hx
+++ b/qmp-commands.hx
@@ -430,13 +430,16 @@ EQMP
{
.name = "migrate",
- .args_type = "detach:-d,blk:-b,inc:-i,uri:s",
- .params = "[-d] [-b] [-i] uri",
- .help = "migrate to URI (using -d to not wait for completion)"
- "\n\t\t\t -b for migration without shared storage with"
- " full copy of disk\n\t\t\t -i for migration without "
- "shared storage with incremental copy of disk "
- "(base image shared between src and destination)",
+ .args_type = "detach:-d,blk:-b,inc:-i,xbrle:-x,uri:s",
+ .params = "[-d] [-b] [-i] [-x] uri",
+ .help = "migrate to URI"
+ "\n\t -d to not wait for completion"
+ "\n\t -b for migration without shared storage with"
+ " full copy of disk"
+ "\n\t -i for migration without"
+ " shared storage with incremental copy of disk"
+ " (base image shared between source and destination)"
+ "\n\t -x to use XBRLE page delta compression",
.user_print = monitor_user_noop,
.mhandler.cmd_new = do_migrate,
},
@@ -452,6 +455,7 @@ Arguments:
- "blk": block migration, full disk copy (json-bool, optional)
- "inc": incremental disk copy (json-bool, optional)
- "uri": Destination URI (json-string)
+- "xbrle": to use XBRLE page delta compression
Example:
@@ -490,6 +494,32 @@ Example:
EQMP
{
+ .name = "migrate_set_cachesize",
+ .args_type = "value:s",
+ .params = "value",
+ .help = "set cache size (in MB) for xbrle migrations",
+ .mhandler.cmd = do_migrate_set_cachesize,
+ },
+
+SQMP
+migrate_set_cachesize
+---------------------
+
+Set cache size to be used by XBRLE migration
+
+Arguments:
+
+- "value": cache size in bytes (json-number)
+
+Example:
+
+-> { "execute": "migrate_set_cachesize", "arguments": { "value": 500M } }
+<- { "return": {} }
+
+
+EQMP
+
+ {
.name = "migrate_set_speed",
.args_type = "value:o",
.mhandler.cmd_new = qmp_marshal_input_migrate_set_speed,
--
1.7.6.5
^ permalink raw reply related [flat|nested] 13+ messages in thread* [Qemu-devel] [PATCH v5 9/9] Add XBRLE statistics information
2012-01-03 13:35 [Qemu-devel] [PATCH v5 0/9] XBZRLE delta for live migration of large memory apps Orit Wasserman
` (7 preceding siblings ...)
2012-01-03 13:35 ` [Qemu-devel] [PATCH v5 8/9] QMP commands changes Orit Wasserman
@ 2012-01-03 13:35 ` Orit Wasserman
8 siblings, 0 replies; 13+ messages in thread
From: Orit Wasserman @ 2012-01-03 13:35 UTC (permalink / raw)
To: qemu-devel; +Cc: blauwirbel, stefanha, Orit Wasserman, quintela
Signed-off-by: Orit Wasserman <owasserm@redhat.com>
---
arch_init.c | 67 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
migration.c | 11 +++++++++
migration.h | 9 ++++++++
3 files changed, 87 insertions(+), 0 deletions(-)
diff --git a/arch_init.c b/arch_init.c
index 6b839a1..037d8ba 100644
--- a/arch_init.c
+++ b/arch_init.c
@@ -149,6 +149,65 @@ void arch_set_params(int blk_enable, int shared_base, int use_xbrle,
}
/***********************************************************/
+/* accounting */
+typedef struct AccountingInfo {
+ uint64_t dup_pages;
+ uint64_t norm_pages;
+ uint64_t xbrle_bytes;
+ uint64_t xbrle_pages;
+ uint64_t xbrle_overflow;
+ uint64_t xbrle_cache_miss;
+ uint64_t iterations;
+} AccountingInfo;
+
+static AccountingInfo acct_info;
+
+static void acct_clear(void)
+{
+ bzero(&acct_info, sizeof(acct_info));
+}
+
+uint64_t dup_mig_bytes_transferred(void)
+{
+ return acct_info.dup_pages;
+}
+
+uint64_t dup_mig_pages_transferred(void)
+{
+ return acct_info.dup_pages;
+}
+
+uint64_t norm_mig_bytes_transferred(void)
+{
+ return acct_info.norm_pages * TARGET_PAGE_SIZE;
+}
+
+uint64_t norm_mig_pages_transferred(void)
+{
+ return acct_info.norm_pages;
+}
+
+uint64_t xbrle_mig_bytes_transferred(void)
+{
+ return acct_info.xbrle_bytes;
+}
+
+uint64_t xbrle_mig_pages_transferred(void)
+{
+ return acct_info.xbrle_pages;
+}
+
+uint64_t xbrle_mig_pages_overflow(void)
+{
+ return acct_info.xbrle_overflow;
+}
+
+uint64_t xbrle_mig_pages_cache_miss(void)
+{
+ return acct_info.xbrle_cache_miss;
+}
+
+/***********************************************************/
/* XBRLE (Xor Based Run-Length Encoding) */
typedef struct XBRLEHeader {
uint8_t xh_flags;
@@ -376,6 +435,7 @@ static int save_xbrle_page(QEMUFile *f, uint8_t *current_data,
/* get location */
slot = cache_is_cached(current_addr);
if (slot == -1) {
+ acct_info.xbrle_cache_miss++;
goto done;
}
cache_location = cache_get_cache_pos(current_addr);
@@ -394,6 +454,7 @@ static int save_xbrle_page(QEMUFile *f, uint8_t *current_data,
if (encoded_len < 0) {
DPRINTF("XBRLE encoding oeverflow - sending uncompressed\n");
+ acct_info.xbrle_overflow++;
goto done;
}
@@ -404,7 +465,9 @@ static int save_xbrle_page(QEMUFile *f, uint8_t *current_data,
save_block_hdr(f, block, offset, cont, RAM_SAVE_FLAG_XBRLE);
qemu_put_buffer(f, (uint8_t *) &hdr, sizeof(hdr));
qemu_put_buffer(f, xbrle_buf, encoded_len);
+ acct_info.xbrle_pages++;
bytes_sent = encoded_len + sizeof(hdr);
+ acct_info.xbrle_bytes += bytes_sent;
done:
g_free(xor_buf);
@@ -457,6 +520,7 @@ static int ram_save_block(QEMUFile *f, int stage)
save_block_hdr(f, block, offset, cont, RAM_SAVE_FLAG_COMPRESS);
qemu_put_byte(f, *p);
bytes_sent = 1;
+ acct_info.dup_pages++;
} else if (stage == 2 && arch_mig_state.use_xbrle) {
bytes_sent = save_xbrle_page(f, p, current_addr, block,
offset, cont);
@@ -465,6 +529,7 @@ static int ram_save_block(QEMUFile *f, int stage)
save_block_hdr(f, block, offset, cont, RAM_SAVE_FLAG_PAGE);
qemu_put_buffer(f, p, TARGET_PAGE_SIZE);
bytes_sent = TARGET_PAGE_SIZE;
+ acct_info.norm_pages++;
}
if (arch_mig_state.use_xbrle) {
cache_insert(current_addr, p);
@@ -596,6 +661,7 @@ int ram_save_live(Monitor *mon, QEMUFile *f, int stage, void *opaque)
if (arch_mig_state.use_xbrle) {
cache_init(arch_mig_state.xbrle_cache_size);
+ acct_clear();
}
/* Make sure all dirty bits are set */
@@ -629,6 +695,7 @@ int ram_save_live(Monitor *mon, QEMUFile *f, int stage, void *opaque)
bytes_sent = ram_save_block(f, stage);
bytes_transferred += bytes_sent;
+ acct_info.iterations++;
if (bytes_sent == 0) { /* no more blocks */
break;
}
diff --git a/migration.c b/migration.c
index 3d88cdd..383ceef 100644
--- a/migration.c
+++ b/migration.c
@@ -141,6 +141,17 @@ MigrationInfo *qmp_query_migrate(Error **errp)
info->disk->remaining = blk_mig_bytes_remaining();
info->disk->total = blk_mig_bytes_total();
}
+
+ if (s->use_xbrle) {
+ info->has_xbrle = true;
+ info->cache = g_malloc0(sizeof(*info->cache));
+ info->cache->dup_pages = dup_mig_pages_transferred();
+ info->cache->norm_pages = norm_mig_pages_transferred();
+ info->cache->xbrle_bytes = xbrle_mig_bytes_transferred();
+ info->cache->xbrle_pages = xbrle_mig_pages_transferred();
+ info->cache->xbrle_overflow = xbrle_mig_pages_overflow();
+ info->cache->xbrle_cache_miss = xbrle_mig_pages_cache_miss();
+ }
break;
case MIG_STATE_COMPLETED:
info->has_status = true;
diff --git a/migration.h b/migration.h
index 6de09c8..dd06ef6 100644
--- a/migration.h
+++ b/migration.h
@@ -81,6 +81,15 @@ uint64_t ram_bytes_remaining(void);
uint64_t ram_bytes_transferred(void);
uint64_t ram_bytes_total(void);
+uint64_t dup_mig_bytes_transferred(void);
+uint64_t dup_mig_pages_transferred(void);
+uint64_t norm_mig_bytes_transferred(void);
+uint64_t norm_mig_pages_transferred(void);
+uint64_t xbrle_mig_bytes_transferred(void);
+uint64_t xbrle_mig_pages_transferred(void);
+uint64_t xbrle_mig_pages_overflow(void);
+uint64_t xbrle_mig_pages_cache_miss(void);
+
int ram_save_live(Monitor *mon, QEMUFile *f, int stage, void *opaque);
int ram_load(QEMUFile *f, void *opaque, int version_id);
--
1.7.6.5
^ permalink raw reply related [flat|nested] 13+ messages in thread
* [Qemu-devel] [PATCH v5 5/9] Add XBRLE to ram_save_block and ram_save_live
2012-01-03 15:34 [Qemu-devel] [PATCH v5 0/9] XBZRLE delta for live migration of large memory apps Orit Wasserman
@ 2012-01-03 15:34 ` Orit Wasserman
2012-01-04 12:14 ` Stefan Hajnoczi
0 siblings, 1 reply; 13+ messages in thread
From: Orit Wasserman @ 2012-01-03 15:34 UTC (permalink / raw)
To: qemu-devel; +Cc: blauwirbel, stefanha, Orit Wasserman, quintela
Add migration state to store XBRLE params (enablement and cache size).
In the outgoing check to see if the page is cached and
send compressed page by using save_xbrle_page function.
In the incoming migration check to see if RAM_SAVE_FLAG_XBRLE is set
decompress the page (by using load_xbrle function).
Signed-off-by: Orit Wasserman <owasserm@redhat.com>
---
arch_init.c | 173 +++++++++++++++++++++++++++++++++++++++++++++++++++++++----
1 files changed, 163 insertions(+), 10 deletions(-)
diff --git a/arch_init.c b/arch_init.c
index 05b8053..6b839a1 100644
--- a/arch_init.c
+++ b/arch_init.c
@@ -102,6 +102,7 @@ const uint32_t arch_type = QEMU_ARCH;
#define RAM_SAVE_FLAG_PAGE 0x08
#define RAM_SAVE_FLAG_EOS 0x10
#define RAM_SAVE_FLAG_CONTINUE 0x20
+#define RAM_SAVE_FLAG_XBRLE 0x40
/***********************************************************/
/* Page cache for storing previous pages as basis for XBRLE compression */
@@ -132,6 +133,22 @@ static unsigned long cache_get_cache_pos(ram_addr_t address);
static CacheItem *cache_item_get(unsigned long pos, int item);
/***********************************************************/
+/* RAM Migration State */
+typedef struct ArchMigrationState {
+ int use_xbrle;
+ int64_t xbrle_cache_size;
+} ArchMigrationState;
+
+static ArchMigrationState arch_mig_state;
+
+void arch_set_params(int blk_enable, int shared_base, int use_xbrle,
+ int64_t xbrle_cache_size, void *opaque)
+{
+ arch_mig_state.use_xbrle = use_xbrle;
+ arch_mig_state.xbrle_cache_size = xbrle_cache_size;
+}
+
+/***********************************************************/
/* XBRLE (Xor Based Run-Length Encoding) */
typedef struct XBRLEHeader {
uint8_t xh_flags;
@@ -346,6 +363,55 @@ static void save_block_hdr(QEMUFile *f, RAMBlock *block, ram_addr_t offset,
}
}
+#define ENCODING_FLAG_XBRLE 0x1
+
+static int save_xbrle_page(QEMUFile *f, uint8_t *current_data,
+ ram_addr_t current_addr, RAMBlock *block, ram_addr_t offset, int cont)
+{
+ int cache_location = -1, slot = -1, encoded_len = 0, bytes_sent = 0;
+ XBRLEHeader hdr = {0};
+ CacheItem *it;
+ uint8_t *xor_buf = NULL, *xbrle_buf = NULL;
+
+ /* get location */
+ slot = cache_is_cached(current_addr);
+ if (slot == -1) {
+ goto done;
+ }
+ cache_location = cache_get_cache_pos(current_addr);
+
+ /* abort if page changed too much */
+ it = cache_item_get(cache_location, slot);
+
+ /* XOR encoding */
+ xor_buf = (uint8_t *) g_malloc0(TARGET_PAGE_SIZE);
+ xor_encode(xor_buf, it->it_data, current_data);
+
+ /* XBRLE (XOR+RLE) encoding (if we can ensure a 1/3 ratio) */
+ xbrle_buf = (uint8_t *) g_malloc0(TARGET_PAGE_SIZE);
+ encoded_len = rle_encode(xor_buf, TARGET_PAGE_SIZE, xbrle_buf,
+ TARGET_PAGE_SIZE/3);
+
+ if (encoded_len < 0) {
+ DPRINTF("XBRLE encoding oeverflow - sending uncompressed\n");
+ goto done;
+ }
+
+ hdr.xh_len = encoded_len;
+ hdr.xh_flags |= ENCODING_FLAG_XBRLE;
+
+ /* Send XBRLE compressed page */
+ save_block_hdr(f, block, offset, cont, RAM_SAVE_FLAG_XBRLE);
+ qemu_put_buffer(f, (uint8_t *) &hdr, sizeof(hdr));
+ qemu_put_buffer(f, xbrle_buf, encoded_len);
+ bytes_sent = encoded_len + sizeof(hdr);
+
+done:
+ g_free(xor_buf);
+ g_free(xbrle_buf);
+ return bytes_sent;
+}
+
static int is_dup_page(uint8_t *page, uint8_t ch)
{
uint32_t val = ch << 24 | ch << 16 | ch << 8 | ch;
@@ -364,7 +430,7 @@ static int is_dup_page(uint8_t *page, uint8_t ch)
static RAMBlock *last_block;
static ram_addr_t last_offset;
-static int ram_save_block(QEMUFile *f)
+static int ram_save_block(QEMUFile *f, int stage)
{
RAMBlock *block = last_block;
ram_addr_t offset = last_offset;
@@ -391,10 +457,18 @@ static int ram_save_block(QEMUFile *f)
save_block_hdr(f, block, offset, cont, RAM_SAVE_FLAG_COMPRESS);
qemu_put_byte(f, *p);
bytes_sent = 1;
+ } else if (stage == 2 && arch_mig_state.use_xbrle) {
+ bytes_sent = save_xbrle_page(f, p, current_addr, block,
+ offset, cont);
+ }
+ if (!bytes_sent) {
save_block_hdr(f, block, offset, cont, RAM_SAVE_FLAG_PAGE);
qemu_put_buffer(f, p, TARGET_PAGE_SIZE);
bytes_sent = TARGET_PAGE_SIZE;
}
+ if (arch_mig_state.use_xbrle) {
+ cache_insert(current_addr, p);
+ }
break;
}
@@ -501,6 +575,10 @@ int ram_save_live(Monitor *mon, QEMUFile *f, int stage, void *opaque)
if (stage < 0) {
cpu_physical_memory_set_dirty_tracking(0);
+ if (arch_mig_state.use_xbrle) {
+ cache_fini();
+ }
+
return 0;
}
@@ -516,6 +594,10 @@ int ram_save_live(Monitor *mon, QEMUFile *f, int stage, void *opaque)
last_offset = 0;
sort_ram_list();
+ if (arch_mig_state.use_xbrle) {
+ cache_init(arch_mig_state.xbrle_cache_size);
+ }
+
/* Make sure all dirty bits are set */
QLIST_FOREACH(block, &ram_list.blocks, next) {
for (addr = block->offset; addr < block->offset + block->length;
@@ -545,7 +627,7 @@ int ram_save_live(Monitor *mon, QEMUFile *f, int stage, void *opaque)
while ((ret = qemu_file_rate_limit(f)) == 0) {
int bytes_sent;
- bytes_sent = ram_save_block(f);
+ bytes_sent = ram_save_block(f, stage);
bytes_transferred += bytes_sent;
if (bytes_sent == 0) { /* no more blocks */
break;
@@ -570,19 +652,71 @@ int ram_save_live(Monitor *mon, QEMUFile *f, int stage, void *opaque)
int bytes_sent;
/* flush all remaining blocks regardless of rate limiting */
- while ((bytes_sent = ram_save_block(f)) != 0) {
+ while ((bytes_sent = ram_save_block(f, stage)) != 0) {
bytes_transferred += bytes_sent;
}
cpu_physical_memory_set_dirty_tracking(0);
+ if (arch_mig_state.use_xbrle) {
+ cache_fini();
+ }
}
qemu_put_be64(f, RAM_SAVE_FLAG_EOS);
expected_time = ram_save_remaining() * TARGET_PAGE_SIZE / bwidth;
+ DPRINTF("ram_save_live: expected(%ld) <= max(%ld)?\n", expected_time,
+ migrate_max_downtime());
+
return (stage == 2) && (expected_time <= migrate_max_downtime());
}
+static int load_xbrle(QEMUFile *f, ram_addr_t addr, void *host)
+{
+ int ret, rc = -1;
+ uint8_t *prev_page, *xor_buf = NULL, *xbrle_buf = NULL;
+ XBRLEHeader hdr = {0};
+
+ /* extract RLE header */
+ qemu_get_buffer(f, (uint8_t *) &hdr, sizeof(hdr));
+ if (!(hdr.xh_flags & ENCODING_FLAG_XBRLE)) {
+ fprintf(stderr, "Failed to load XBRLE page - wrong compression!\n");
+ goto done;
+ }
+
+ if (hdr.xh_len > TARGET_PAGE_SIZE) {
+ fprintf(stderr, "Failed to load XBRLE page - len overflow!\n");
+ goto done;
+ }
+
+ /* load data and decode */
+ xbrle_buf = (uint8_t *) g_malloc0(TARGET_PAGE_SIZE);
+ qemu_get_buffer(f, xbrle_buf, hdr.xh_len);
+
+ /* decode RLE */
+ xor_buf = (uint8_t *) g_malloc0(TARGET_PAGE_SIZE);
+ ret = rle_decode(xbrle_buf, hdr.xh_len, xor_buf, TARGET_PAGE_SIZE);
+ if (ret == -1) {
+ fprintf(stderr, "Failed to load XBRLE page - decode error!\n");
+ goto done;
+ }
+
+ if (ret != TARGET_PAGE_SIZE) {
+ fprintf(stderr, "Failed to load XBRLE page - size %d expected %d!\n",
+ ret, TARGET_PAGE_SIZE);
+ goto done;
+ }
+
+ /* decode XOR delta */
+ prev_page = host;
+ xor_encode(prev_page, prev_page, xor_buf);
+ rc = 0;
+done:
+ g_free(xor_buf);
+ g_free(xbrle_buf);
+ return rc;
+}
+
static inline void *host_from_stream_offset(QEMUFile *f,
ram_addr_t offset,
int flags)
@@ -633,14 +767,18 @@ static inline void *host_from_stream_offset_versioned(int version_id,
int ram_load(QEMUFile *f, void *opaque, int version_id)
{
ram_addr_t addr;
- int flags;
+ int flags, ret = 0;
int error;
+ static uint64_t seq_iter;
+
+ seq_iter++;
if (version_id < 3 || version_id > 4) {
return -EINVAL;
}
do {
+ void *host;
addr = qemu_get_be64(f);
flags = addr & ~TARGET_PAGE_MASK;
@@ -649,7 +787,8 @@ int ram_load(QEMUFile *f, void *opaque, int version_id)
if (flags & RAM_SAVE_FLAG_MEM_SIZE) {
if (version_id == 3) {
if (addr != ram_bytes_total()) {
- return -EINVAL;
+ ret = -EINVAL;
+ goto done;
}
} else {
/* Synchronize RAM block list */
@@ -668,8 +807,10 @@ int ram_load(QEMUFile *f, void *opaque, int version_id)
QLIST_FOREACH(block, &ram_list.blocks, next) {
if (!strncmp(id, block->idstr, sizeof(id))) {
- if (block->length != length)
- return -EINVAL;
+ if (block->length != length) {
+ ret = -EINVAL;
+ goto done;
+ }
break;
}
}
@@ -677,7 +818,8 @@ int ram_load(QEMUFile *f, void *opaque, int version_id)
if (!block) {
fprintf(stderr, "Unknown ramblock \"%s\", cannot "
"accept migration\n", id);
- return -EINVAL;
+ ret = -EINVAL;
+ goto done;
}
total_ram_bytes -= length;
@@ -704,14 +846,25 @@ int ram_load(QEMUFile *f, void *opaque, int version_id)
host = host_from_stream_offset_versioned(version_id,
f, addr, flags);
qemu_get_buffer(f, host, TARGET_PAGE_SIZE);
+ } else if (flags & RAM_SAVE_FLAG_XBRLE) {
+ host = host_from_stream_offset_versioned(version_id,
+ f, addr, flags);
+ if (load_xbrle(f, addr, host) < 0) {
+ ret = -EINVAL;
+ goto done;
+ }
}
error = qemu_file_get_error(f);
if (error) {
- return error;
+ ret = error;
+ goto done;
}
} while (!(flags & RAM_SAVE_FLAG_EOS));
- return 0;
+done:
+ DPRINTF("Completed load of VM with exit code %d seq iteration %ld\n",
+ ret, seq_iter);
+ return ret;
}
#ifdef HAS_AUDIO
--
1.7.6.5
^ permalink raw reply related [flat|nested] 13+ messages in thread* Re: [Qemu-devel] [PATCH v5 5/9] Add XBRLE to ram_save_block and ram_save_live
2012-01-03 15:34 ` [Qemu-devel] [PATCH v5 5/9] Add XBRLE to ram_save_block and ram_save_live Orit Wasserman
@ 2012-01-04 12:14 ` Stefan Hajnoczi
2012-01-04 13:29 ` Orit Wasserman
0 siblings, 1 reply; 13+ messages in thread
From: Stefan Hajnoczi @ 2012-01-04 12:14 UTC (permalink / raw)
To: Orit Wasserman; +Cc: blauwirbel, qemu-devel, quintela
On Tue, Jan 3, 2012 at 3:34 PM, Orit Wasserman <owasserm@redhat.com> wrote:
> + /* XOR encoding */
> + xor_buf = (uint8_t *) g_malloc0(TARGET_PAGE_SIZE);
Is this an old version of the code? I remember pointing out all the
useless zeroing in a previous revision. If the next line is going to
memcpy or overwrite the entire buffer, please don't zero it first -
especially when the buffer isn't just a small struct.
Stefan
^ permalink raw reply [flat|nested] 13+ messages in thread
* Re: [Qemu-devel] [PATCH v5 5/9] Add XBRLE to ram_save_block and ram_save_live
2012-01-04 12:14 ` Stefan Hajnoczi
@ 2012-01-04 13:29 ` Orit Wasserman
0 siblings, 0 replies; 13+ messages in thread
From: Orit Wasserman @ 2012-01-04 13:29 UTC (permalink / raw)
To: Stefan Hajnoczi; +Cc: blauwirbel, qemu-devel, quintela
On 01/04/2012 02:14 PM, Stefan Hajnoczi wrote:
> On Tue, Jan 3, 2012 at 3:34 PM, Orit Wasserman <owasserm@redhat.com> wrote:
>> + /* XOR encoding */
>> + xor_buf = (uint8_t *) g_malloc0(TARGET_PAGE_SIZE);
>
> Is this an old version of the code? I remember pointing out all the
> useless zeroing in a previous revision. If the next line is going to
> memcpy or overwrite the entire buffer, please don't zero it first -
> especially when the buffer isn't just a small struct.
I will fix it
>
> Stefan
^ permalink raw reply [flat|nested] 13+ messages in thread