sendfile and page usage statistics

[Jan Mikkelsen]

Hi,

Igor Sysoev wrote:
> As I understand the following patch against uipc_syscalls.c
> should fix the bug to some extent:
> 
>                          if (pg->valid && vm_page_is_valid(pg,
> pgoff, xfsize))
> +                                vm_page_flag_set(pg,
> PG_REFERENCED);
>                                  VM_OBJECT_UNLOCK(obj);
>                          else if (m != NULL)
> 

Without knowing anything at all about the surrounding code, I
suspect this patch is missing some braces.  The change should
probably look like this:

                        if (pg->valid && vm_page_is_valid(pg,
pgoff, xfsize)) {
                                vm_page_flag_set(pg,
PG_REFERENCED);
                                VM_OBJECT_UNLOCK(obj);
                        } else if (m != NULL)

I don't think you'll get the behaviour you expect with your change.

Regards,

Jan Mikkelsen