Brian Jackson wrote:
On Monday 03 August 2009 01:09:38 pm Izik Eidus wrote:
Brian Jackson wrote:
If someone wanted to play around with ksm in qemu-kvm-0.x.x would it be
as simple as adding the below additions to kvm_setup_guest_memory in
kvm-all.c
qemu-kvm-0.x.x doesnt tell me much, but if it is the function that
register the memory than yes...
(I just remember that qemu used to have something called phys_ram_base,
in that case it would be just making madvise on phys_ram_base with the
same of phys_ram_size....)
Sorry, I'm using qemu-kvm-0.10.6
This is what qemu_ram_alloc looks like:
/* XXX: better than nothing */
ram_addr_t qemu_ram_alloc(ram_addr_t size)
{
ram_addr_t addr;
if ((phys_ram_alloc_offset + size) > phys_ram_size) {
fprintf(stderr, "Not enough memory (requested_size = %" PRIu64 ", max memory = %"
PRIu64 ")\n",
(uint64_t)size, (uint64_t)phys_ram_size);
abort();
}
addr = phys_ram_alloc_offset;
phys_ram_alloc_offset = TARGET_PAGE_ALIGN(phys_ram_alloc_offset + size);
if (kvm_enabled())
kvm_setup_guest_memory(phys_ram_base + addr, size);
return addr;
}
And this is what my new kvm_setup_guest_memory looks like:
void kvm_setup_guest_memory(void *start, size_t size)
{
if (!kvm_has_sync_mmu()) {
#ifdef MADV_DONTFORK
int ret = madvise(start, size, MADV_DONTFORK);
if (ret) {
perror("madvice");
exit(1);
}
#else
fprintf(stderr,
"Need MADV_DONTFORK in absence of synchronous KVM MMU\n");
exit(1);
#endif
}
#ifdef MADV_MERGEABLE
madvise(start, size, MADV_MERGEABLE);
#endif
}
Look okay?
Yes.
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