[openib-general] Re: [resend][RFC][PATCH] adding call to madvise

[Michael S. Tsirkin]

Quoting r. Gleb Natapov <glebn at voltaire.com>:
> @@ -187,8 +194,8 @@ int ibv_lock_range(void *base, size_t si
>  
>  
>  		if (node->refcnt++ == 0) {
> -			ret = mlock((void *) node->start,
> -				    node->end - node->start + 1);
> +			ret = madvise((void *) node->start,
> +				    node->end - node->start + 1, MADV_DONTFORK);
>  			if (ret)
>  				goto out;
>  		}

Will this break libibverbs on older kernels that don't have madvise?
Maybe test MADV_DONTFORK during library startup and set a flag?

-- 
MST