Avi Kivity wrote:
From: Izik Eidus <iei...@redhat.com>
Call madvise(MADV_MERGEABLE) on the memory allocations to allow the
kernel to merge them.
Signed-off-by: Izik Eidus <iei...@redhat.com>
Signed-off-by: Avi Kivity <a...@redhat.com>
Any reason to not send this to upstream qemu?
diff --git a/exec.c b/exec.c
index 5c9edf7..406d2cb 100644
--- a/exec.c
+++ b/exec.c
@@ -2538,6 +2538,9 @@ ram_addr_t qemu_ram_alloc(ram_addr_t size)
new_block->host = file_ram_alloc(size, mem_path);
if (!new_block->host) {
new_block->host = qemu_vmalloc(size);
+#ifdef MADV_MERGEABLE
+ madvise(new_block->host, size, MADV_MERGEABLE);
+#endif
}
new_block->offset = last_ram_offset;
new_block->length = size;
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Regards,
Anthony Liguori
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