Re: [Qemu-devel] [PATCH 3/8] migration: support to detect compression and decompression errors

[Xiao Guangrong]

On 03/15/2018 07:29 PM, Dr. David Alan Gilbert wrote:

> > @@ -1051,11 +1052,13 @@ static int do_compress_ram_page(QEMUFile *f, z_stream 
> > *stream, RAMBlock *block,
> >   {
> >       RAMState *rs = ram_state;
> >       int bytes_sent, blen;
> > -    uint8_t *p = block->host + (offset & TARGET_PAGE_MASK);
> > +    uint8_t buf[TARGET_PAGE_SIZE], *p;
>
> That should be malloc'd somewhere rather than be on the stack; it's a
> bit big and also there are architectures where TARGET_PAGE_SIZE isn't
> compile time constant.

Okay, i will allocate a internal buffer for each thread...

> (Also, please use g_try_malloc rather than g_malloc on larger chunks,
> since g_try_malloc will return NULL so you can fail nicely;  g_malloc is
> OK for small things that are very unlikely to fail).
>
> Other than that, I think the patch is fine.

Thank you, Dave!