Re: epoll_wait returning EFAULT on Linux 3.2.78

Hi,

On 2016-06-02 17:50:20 +0100, Greg Stark wrote:
> So FYI, it does look like Postgres built in 32-bit mode, at least
> pointers are 32 bits. But I think maxalign might still be enough due
> to doubles being 64 bits.

That makes sense independent of 32 vs. 64 system. Part of the relevant
struct probably require 8 byte alignment:
          typedef union epoll_data {              void    *ptr;              int      fd;              uint32_t u32;
         uint64_t u64;          } epoll_data_t;
 
          struct epoll_event {              uint32_t     events;    /* Epoll events */              epoll_data_t data;
   /* User data variable */          };
 

So using long long alignment seems the best bet here.

Greg, are you writing & testing a patch? Or should I write something for
you to test?

Regards,

Andres