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qemu
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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>
This commit is contained in:
Anthony Liguori 2009-06-17 16:46:12 -05:00
parent b09ea7d55c
commit 30868442a5
1 changed files with 6 additions and 0 deletions
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6
vl.c
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@ -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);