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| author | Anthony Liguori <aliguori@us.ibm.com> | 2009-06-17 16:46:12 -0500 |
|---|---|---|
| committer | Anthony Liguori <aliguori@us.ibm.com> | 2009-06-22 10:15:28 -0500 |
| commit | 30868442a5590991266a34af3f0b728a4a0ee6d0 (patch) | |
| tree | 24f2dc2fa45cd72922f95b4250cbb401027825da | |
| parent | b09ea7d55cfab5a75912bb56ed1fcd757604a759 (diff) | |
| download | focaccia-qemu-30868442a5590991266a34af3f0b728a4a0ee6d0.tar.gz focaccia-qemu-30868442a5590991266a34af3f0b728a4a0ee6d0.zip | |
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>
| -rw-r--r-- | vl.c | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/vl.c b/vl.c index 2d9f04e4c2..ca26450e30 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); |