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xen-devel
[Xen-devel] Re: [PATCH] xen: Avoid useless allocation in Xen case.
On 2011-08-01 21:26, Anthony PERARD wrote:
> The code_gen_buffer is not use by Xen and can be really big (several
> GB). Even if the host RAM is not used, this buffer just burn the address
> space of the QEMU process.
>
> So to "avoid" this allocation, the asked tb_size is set to the minimum.
>
> The other way to do that would be to not call code_gen_alloc when Xen is
> enabled.
>
> Signed-off-by: Anthony PERARD <anthony.perard@xxxxxxxxxx>
> ---
> vl.c | 8 ++++++++
> 1 files changed, 8 insertions(+), 0 deletions(-)
>
> diff --git a/vl.c b/vl.c
> index d8c7c01..bd60a89 100644
> --- a/vl.c
> +++ b/vl.c
> @@ -3106,6 +3106,14 @@ int main(int argc, char **argv, char **envp)
> }
> }
>
> + if (xen_enabled()) {
> + /* Allocate only the minimum amount of memory for the
> code_gen_buffer.
> + * Xen does not use it and we need the virtual address space for the
> + * MapCache.
> + */
> + tb_size = 1;
> + }
> +
The same applies to kvm, please generalize.
Jan
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