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authorMichael R. Hines <mrhines@us.ibm.com>2013-07-22 10:01:53 -0400
committerJuan Quintela <quintela@redhat.com>2013-07-23 11:11:59 +0200
commit44c3b58cf9b2c91a38363f0b45d20f3f40b8f2b3 (patch)
tree21cfc9a8daeaa59a0c8683b12a70d5050a332dff /arch_init.c
parentde7b685c9e1cf606e37e7116e4c4f03a6ae2d14f (diff)
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rdma: introduce ram_handle_compressed()
This gives RDMA shared access to madvise() on the destination side when an entire chunk is found to be zero. Reviewed-by: Juan Quintela <quintela@redhat.com> Reviewed-by: Paolo Bonzini <pbonzini@redhat.com> Reviewed-by: Chegu Vinod <chegu_vinod@hp.com> Tested-by: Chegu Vinod <chegu_vinod@hp.com> Tested-by: Michael R. Hines <mrhines@us.ibm.com> Signed-off-by: Michael R. Hines <mrhines@us.ibm.com> Signed-off-by: Juan Quintela <quintela@redhat.com>
Diffstat (limited to 'arch_init.c')
-rw-r--r--arch_init.c29
1 files changed, 19 insertions, 10 deletions
diff --git a/arch_init.c b/arch_init.c
index e9dd96f..09a7125 100644
--- a/arch_init.c
+++ b/arch_init.c
@@ -808,6 +808,24 @@ static inline void *host_from_stream_offset(QEMUFile *f,
return NULL;
}
+/*
+ * If a page (or a whole RDMA chunk) has been
+ * determined to be zero, then zap it.
+ */
+void ram_handle_compressed(void *host, uint8_t ch, uint64_t size)
+{
+ if (ch != 0 || !is_zero_page(host)) {
+ memset(host, ch, size);
+#ifndef _WIN32
+ if (ch == 0 &&
+ (!kvm_enabled() || kvm_has_sync_mmu()) &&
+ getpagesize() <= TARGET_PAGE_SIZE) {
+ qemu_madvise(host, TARGET_PAGE_SIZE, QEMU_MADV_DONTNEED);
+ }
+#endif
+ }
+}
+
static int ram_load(QEMUFile *f, void *opaque, int version_id)
{
ram_addr_t addr;
@@ -879,16 +897,7 @@ static int ram_load(QEMUFile *f, void *opaque, int version_id)
}
ch = qemu_get_byte(f);
- if (ch != 0 || !is_zero_page(host)) {
- memset(host, ch, TARGET_PAGE_SIZE);
-#ifndef _WIN32
- if (ch == 0 &&
- (!kvm_enabled() || kvm_has_sync_mmu()) &&
- getpagesize() <= TARGET_PAGE_SIZE) {
- qemu_madvise(host, TARGET_PAGE_SIZE, QEMU_MADV_DONTNEED);
- }
-#endif
- }
+ ram_handle_compressed(host, ch, TARGET_PAGE_SIZE);
} else if (flags & RAM_SAVE_FLAG_PAGE) {
void *host;