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[Qemu-devel] [PATCH v4 4/5] migration: Convert ram to use new load_setup
From: |
Juan Quintela |
Subject: |
[Qemu-devel] [PATCH v4 4/5] migration: Convert ram to use new load_setup()/load_cleanup() |
Date: |
Wed, 28 Jun 2017 11:52:27 +0200 |
Once there, I rename ram_migration_cleanup() to ram_save_cleanup().
Notice that this is the first pass, and I only passed XBZRLE to the
new scheme. Moved decoded_buf to inside XBZRLE struct.
As a bonus, I don't have to export xbzrle functions from ram.c.
Signed-off-by: Juan Quintela <address@hidden>
Reviewed-by: Dr. David Alan Gilbert <address@hidden>
--
loaded_data pointer was needed because called can change it (dave)
spell loaded correctly in comment (dave)
---
migration/migration.c | 3 ---
migration/ram.c | 49 ++++++++++++++++++++++++++++++++++++-------------
migration/ram.h | 1 -
3 files changed, 36 insertions(+), 17 deletions(-)
diff --git a/migration/migration.c b/migration/migration.c
index 8ea35f1..e244876 100644
--- a/migration/migration.c
+++ b/migration/migration.c
@@ -357,9 +357,6 @@ static void process_incoming_migration_co(void *opaque)
migrate_decompress_threads_join();
exit(EXIT_FAILURE);
}
-
- free_xbzrle_decoded_buf();
-
mis->bh = qemu_bh_new(process_incoming_migration_bh, mis);
qemu_bh_schedule(mis->bh);
}
diff --git a/migration/ram.c b/migration/ram.c
index 649f76c..73aec34 100644
--- a/migration/ram.c
+++ b/migration/ram.c
@@ -85,11 +85,10 @@ static struct {
QemuMutex lock;
/* it will store a page full of zeros */
uint8_t *zero_target_page;
+ /* buffer used for XBZRLE decoding */
+ uint8_t *decoded_buf;
} XBZRLE;
-/* buffer used for XBZRLE decoding */
-static uint8_t *xbzrle_decoded_buf;
-
static void XBZRLE_cache_lock(void)
{
if (migrate_use_xbzrle())
@@ -1350,13 +1349,18 @@ uint64_t ram_bytes_total(void)
return total;
}
-void free_xbzrle_decoded_buf(void)
+static void xbzrle_load_setup(void)
{
- g_free(xbzrle_decoded_buf);
- xbzrle_decoded_buf = NULL;
+ XBZRLE.decoded_buf = g_malloc(TARGET_PAGE_SIZE);
}
-static void ram_migration_cleanup(void *opaque)
+static void xbzrle_load_cleanup(void)
+{
+ g_free(XBZRLE.decoded_buf);
+ XBZRLE.decoded_buf = NULL;
+}
+
+static void ram_save_cleanup(void *opaque)
{
RAMState **rsp = opaque;
RAMBlock *block;
@@ -2078,11 +2082,6 @@ static int load_xbzrle(QEMUFile *f, ram_addr_t addr,
void *host)
int xh_flags;
uint8_t *loaded_data;
- if (!xbzrle_decoded_buf) {
- xbzrle_decoded_buf = g_malloc(TARGET_PAGE_SIZE);
- }
- loaded_data = xbzrle_decoded_buf;
-
/* extract RLE header */
xh_flags = qemu_get_byte(f);
xh_len = qemu_get_be16(f);
@@ -2096,7 +2095,9 @@ static int load_xbzrle(QEMUFile *f, ram_addr_t addr, void
*host)
error_report("Failed to load XBZRLE page - len overflow!");
return -1;
}
+ loaded_data = XBZRLE.decoded_buf;
/* load data and decode */
+ /* it can change loaded_data to point to an internal buffer */
qemu_get_buffer_in_place(f, &loaded_data, xh_len);
/* decode RLE */
@@ -2310,6 +2311,26 @@ static void decompress_data_with_multi_threads(QEMUFile
*f,
}
/**
+ * ram_load_setup: Setup RAM for migration incoming side
+ *
+ * Returns zero to indicate success and negative for error
+ *
+ * @f: QEMUFile where to receive the data
+ * @opaque: RAMState pointer
+ */
+static int ram_load_setup(QEMUFile *f, void *opaque)
+{
+ xbzrle_load_setup();
+ return 0;
+}
+
+static int ram_load_cleanup(void *opaque)
+{
+ xbzrle_load_cleanup();
+ return 0;
+}
+
+/**
* ram_postcopy_incoming_init: allocate postcopy data structures
*
* Returns 0 for success and negative if there was one error
@@ -2629,7 +2650,9 @@ static SaveVMHandlers savevm_ram_handlers = {
.save_live_complete_precopy = ram_save_complete,
.save_live_pending = ram_save_pending,
.load_state = ram_load,
- .save_cleanup = ram_migration_cleanup,
+ .save_cleanup = ram_save_cleanup,
+ .load_setup = ram_load_setup,
+ .load_cleanup = ram_load_cleanup,
};
void ram_mig_init(void)
diff --git a/migration/ram.h b/migration/ram.h
index 6272eb0..a8b79a4 100644
--- a/migration/ram.h
+++ b/migration/ram.h
@@ -47,7 +47,6 @@ void migrate_decompress_threads_join(void);
uint64_t ram_pagesize_summary(void);
int ram_save_queue_pages(const char *rbname, ram_addr_t start, ram_addr_t len);
void acct_update_position(QEMUFile *f, size_t size, bool zero);
-void free_xbzrle_decoded_buf(void);
void ram_debug_dump_bitmap(unsigned long *todump, bool expected,
unsigned long pages);
void ram_postcopy_migrated_memory_release(MigrationState *ms);
--
2.9.4
[Qemu-devel] [PATCH v4 4/5] migration: Convert ram to use new load_setup()/load_cleanup(),
Juan Quintela <=
[Qemu-devel] [PATCH v4 5/5] migration: Make compression_threads use save/load_setup/cleanup(), Juan Quintela, 2017/06/28