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[Qemu-commits] [COMMIT 3086844] Instead of writing a zero page, madvise
From: |
Anthony Liguori |
Subject: |
[Qemu-commits] [COMMIT 3086844] Instead of writing a zero page, madvise it away |
Date: |
Mon, 22 Jun 2009 15:51:06 -0000 |
From: Anthony Liguori <address@hidden>
Otherwise, after migration, we end up with a much larger RSS size then we
ought to have.
Signed-off-by: Anthony Liguori <address@hidden>
diff --git a/vl.c b/vl.c
index 2d9f04e..ca26450 100644
--- a/vl.c
+++ b/vl.c
@@ -3346,6 +3346,12 @@ static int ram_load(QEMUFile *f, void *opaque, int
version_id)
if (flags & RAM_SAVE_FLAG_COMPRESS) {
uint8_t ch = qemu_get_byte(f);
+#if defined(__linux__)
+ if (ch == 0 &&
+ (!kvm_enabled() || kvm_has_sync_mmu())) {
+ madvise(qemu_get_ram_ptr(addr), TARGET_PAGE_SIZE,
MADV_DONTNEED);
+ } else
+#endif
memset(qemu_get_ram_ptr(addr), ch, TARGET_PAGE_SIZE);
} else if (flags & RAM_SAVE_FLAG_PAGE)
qemu_get_buffer(f, qemu_get_ram_ptr(addr), TARGET_PAGE_SIZE);
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