[Qemu-devel] [PATCH 3/7] arch_init: add ram_madvise_free()

[Lei Li <lilei@linux.vnet.ibm.com>]

Signed-off-by: Lei Li <lilei@linux.vnet.ibm.com>
---
 arch_init.c                   |   13 +++++++++++++
 include/migration/migration.h |    3 +++
 2 files changed, 16 insertions(+), 0 deletions(-)

diff --git a/arch_init.c b/arch_init.c
index 872020e..fc66bd2 100644
--- a/arch_init.c
+++ b/arch_init.c
@@ -524,6 +524,19 @@ uint64_t ram_bytes_total(void)
     return total;
 }
 
+void ram_madvise_free(ram_addr_t size)
+{
+    void *ram;
+    RAMBlock *block = NULL;
+
+    ram = memory_region_get_ram_ptr(block->mr);
+
+    /* XXX. Here just simplely madvise(.., MADV_DONTNEED) the whole ram
+     * pages, need more work to keep MADV_DONTNEED ram pages that
+     * already sent. */
+    qemu_madvise(ram, size, MADV_DONTNEED);
+}
+
 static void migration_end(void)
 {
     if (migration_bitmap) {
diff --git a/include/migration/migration.h b/include/migration/migration.h
index 8866c3c..9cc5285 100644
--- a/include/migration/migration.h
+++ b/include/migration/migration.h
@@ -21,6 +21,7 @@
 #include "qapi/error.h"
 #include "migration/vmstate.h"
 #include "qapi-types.h"
+#include "exec/memory.h"
 
 enum {
     MIG_STATE_ERROR,
@@ -100,6 +101,8 @@ uint64_t ram_bytes_remaining(void);
 uint64_t ram_bytes_transferred(void);
 uint64_t ram_bytes_total(void);
 
+void ram_madvise_free(ram_addr_t size);
+
 extern SaveVMHandlers savevm_ram_handlers;
 
 uint64_t dup_mig_bytes_transferred(void);
-- 
1.7.7.6