Instead of writing a zero page, madvise it away
Otherwise, after migration, we end up with a much larger RSS size then we ought to have. Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
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b09ea7d55c
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30868442a5
6
vl.c
6
vl.c
@ -3346,6 +3346,12 @@ static int ram_load(QEMUFile *f, void *opaque, int version_id)
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if (flags & RAM_SAVE_FLAG_COMPRESS) {
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uint8_t ch = qemu_get_byte(f);
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#if defined(__linux__)
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if (ch == 0 &&
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(!kvm_enabled() || kvm_has_sync_mmu())) {
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madvise(qemu_get_ram_ptr(addr), TARGET_PAGE_SIZE, MADV_DONTNEED);
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} else
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#endif
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memset(qemu_get_ram_ptr(addr), ch, TARGET_PAGE_SIZE);
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} else if (flags & RAM_SAVE_FLAG_PAGE)
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qemu_get_buffer(f, qemu_get_ram_ptr(addr), TARGET_PAGE_SIZE);
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